JP2001182990A - Air conditioning method and air conditioner and its controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioning method and an air conditioner and its controlling method in which fresh air can be introduced into a room and utilized effectively depending on the temperature and humidity and a comfortable indoor space can be realized while reducing energy. SOLUTION: An outdoor air introducing means 6 introduces outdoor air into a room and an indoor heat exchanger 3 supplies suction air, i.e., a mixture of indoor air and outdoor air, into the room after exchanging heat with refrigerant thus bringing the indoor humidity to a target level. The quantity of outdoor air introduced into the room is set, along with the air conditioning capacity and the refrigerant temperature of the indoor heat exchanger 3, based on outdoor air temperature and humidity detected by outdoor air temperature and humidity detecting means 11, 12, indoor air temperature and humidity detected by indoor air temperature and humidity detecting means 9, 10, an indoor air conditioning load detected by an indoor air conditioning load detecting means, and target indoor air temperature and humidity. The outdoor air introducing means 6 is controlled to introduce a set quantity of outdoor air and the operation of heat transport means 7, 8 and an indoor fan 5 is controlled to ensure set air conditioning capacity and refrigerant temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and an air conditioner for controlling indoor air, and more particularly to an air conditioner and a method for controlling an air conditioner. The present invention relates to a device that performs a healthy operation by fresh air and reduces energy consumption using the temperature and humidity of the outdoor air.

[0002]

2. Description of the Related Art As a ventilation type air conditioner for ventilating indoor air with fresh outside air, for example, Japanese Patent Application Laid-Open No. 8-145432.
There is one shown in Japanese Patent Publication No. FIG. 22 is a configuration diagram showing this conventional air conditioner. Reference numeral 111 denotes an air conditioner, which is an indoor unit 1 embedded and installed in a ceiling.
And an outdoor unit installed outdoors. The indoor unit 1 is buried in a ceiling or the like of the room 2 and incorporates an indoor fan 5 including a cross flow fan and the like and an indoor heat exchanger 3 and the like. In addition, the inlet grill 80 and the outlet grill 90 are opened on the upstream and downstream sides of the indoor heat exchanger 3 in the decorative panel facing the room. A ventilation duct 110 provided with a ventilation fan 100 is connected to the ventilation passage on the upstream side of the indoor heat exchanger 3. And an outside air introduction mechanism for selectively introducing outside air from the opening at the tip of the ventilation duct 110.

Next, the operation will be described. The indoor unit 1 includes a room temperature sensor 190 for detecting a room temperature inside thereof,
An indoor controller including a microprocessor and the like is built in. Then, when the air-conditioning operation is in the automatic operation mode, the indoor controller reads the room temperature detection value detected by the room temperature sensor 190 and the outside air temperature detection value detected by the outside air temperature sensor 191, respectively, and responds to both the detection values. Heating and cooling,
Automatically selects an appropriate operation mode such as dry air blowing, simple air blowing, operation stop, etc., and sets the operation command frequency signal necessary to set the room temperature detection value to the room temperature set value set by the remote controller etc. Operatively provided to the outdoor controller. In this case, by automatically selecting an appropriate operation mode type in accordance with the fluctuation of the outside air temperature, fresh outside air is directly introduced into the indoor unit 1 in the middle of a season or the like, and the outside air is simply introduced into the indoor unit. The air is cooled by blowing air to reduce power consumption.
When the ventilation operation is selected by a remote controller or the like, the indoor controller sends an ON signal to the ventilation fan 100.
And the damper of the ventilation duct 110 is operated to introduce fresh outside air into the indoor unit 1.
When introducing outside air, the room temperature is corrected based on the detected outside air temperature, the detected room temperature, the amount of outside air introduced, and the amount of air blown into the room, and controlled to an appropriate air conditioning capacity according to the temperature fluctuation of the introduced outside air. I am trying to do it.

[Problems to be solved by the invention]

In the conventional air conditioner as described above, an appropriate operation mode is set according to the indoor temperature and the outside air temperature in the automatic operation mode, and the control of the outside air introduction is controlled according to the outside air temperature and the indoor temperature. Is being done. It is described that the switching of the operation mode at this time is performed, for example, when the outside air temperature is lower than the room temperature, cooling is performed by blowing air. That is, when the outside air is introduced in the automatic operation mode, heat exchange with the refrigerant in the indoor heat exchanger 3 is not performed, and only the air is blown. When ventilation operation is requested, heat exchange with the refrigerant in the indoor heat exchanger 3 is performed together with introduction of outside air. At this time, the room temperature is corrected with the outside air temperature, and air conditioning is performed according to the corrected temperature. Controlling ability. In such a conventional air conditioner, the introduction of outside air is controlled only by the outside air temperature and the room temperature. For example, when the outside air temperature is lower than the room temperature and the outside air humidity is higher than the room humidity, the outside air is introduced. Then, there is a problem that indoor humidity rises, and useless work is performed in the air conditioner to reduce the humidity. In addition, the only reason why outside air is positively introduced is that air is only used as air when the outside air temperature is lower than the room temperature in the case of cooling.
However, when the outside air temperature is higher than the room temperature and the outside air humidity is lower than the room humidity during the rainy season, etc., more outside air can be used by introducing low-humidity outside air to make the room a comfortable space. It can be used positively for effective use of energy. In addition, since the air-conditioning capacity is controlled only by the temperature regardless of the humidity, a comfortable indoor space cannot be obtained particularly in a high humidity period such as the rainy season. Further, since the ventilation fan is on / off controlled, the air volume is fixed, and depending on the state of the outside air, the air conditioner may perform useless work. That is, there is a problem that useless work is performed from the viewpoint of energy saving.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to provide a comfortable indoor space by introducing outside air according to the outdoor air condition and effectively utilizing the outside air. An object of the present invention is to obtain an air conditioning method, an air conditioning apparatus, and a control method of an air conditioning apparatus that can perform air conditioning. In addition, when operating and controlling the air conditioner when actively using the outside air, the air conditioner can control the air humidity in conjunction with the air temperature to control the air conditioner so that air conditioning can be performed so that a comfortable indoor space can be obtained. It is an object to obtain a method and an air conditioner and a control method of the air conditioner. It is another object of the present invention to provide an air conditioning method, an air conditioning apparatus, and a method for controlling an air conditioning apparatus, which make it possible to optimize the amount of outside air introduced to an air conditioning target and realize energy saving without performing unnecessary work. .

[0006]

According to a first aspect of the present invention, there is provided an air conditioning method, comprising: cooling or heating room air with an air conditioner, thereby changing the temperature or humidity of the room air in relation to a target temperature. Performing air conditioning in the room so as to approach values of temperature and humidity, and introducing the outside air into the room with outside air introduction means capable of adjusting the introduction amount of outside air, comprising: The amount of outside air introduced is changed based on humidity, the temperature and humidity of the room air, and the target temperature and humidity of the room air.

The air conditioning method according to a second aspect of the present invention is characterized in that when the enthalpy of the outside air is larger than the enthalpy of the room air, the outside air introduction means is closed to minimize the amount of outside air introduced. Is what you do.

In the air conditioning method according to a third aspect of the present invention, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are target values from the temperature and humidity of the room air. When the temperature and humidity are closer to the target values of temperature and humidity from the temperature and humidity of the mixed air obtained by mixing the outside air and the room air when the temperature is lower than the extension of the change to the temperature and humidity, The amount of outside air introduced is adjusted so that the amount of change in humidity with respect to the amount of change is large.

In the air conditioning method according to a fourth aspect of the present invention, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are target values from the temperature and humidity of the room air. When the temperature and humidity are closer to the target values of temperature and humidity from the temperature and humidity of the mixed air obtained by mixing the outside air and the room air when the humidity is on the lower humidity side than the extension line of the change to the temperature and humidity, It is characterized in that the amount of outside air introduced is adjusted so that the amount of change in humidity with respect to the amount of change is small.

Further, the air conditioner according to claim 5 of the present invention exchanges heat or cold with the suctioned air transported by the heat transport means to reduce at least one of the temperature and humidity of the suctioned air. An indoor heat exchanger to be changed, an indoor fan that blows air after the heat exchange by the indoor heat exchanger into the room as blown air, an outside air introduction unit that introduces outside air from outside, and an outside air that detects a temperature of the outside air. Temperature detection means, outside air humidity detection means for detecting the humidity of the outside air, indoor temperature detection means for detecting the temperature of the indoor air, indoor humidity detection means for detecting the humidity of the indoor air, and the air conditioning load in the room Indoor air-conditioning load detecting means for detecting the temperature and humidity of the outside air, an indoor air condition obtained from the temperature and humidity of the indoor air, Based on the room air-conditioning load obtained, the target room air temperature and the target room air state obtained from the target room air humidity, the outside air state, the room air state, the room air-conditioning load, and the target room air state. Operating operation setting means for setting the amount of outside air introduced to take in the outside air into the room and the amount of change in temperature and humidity between the suction air and the blown air in the indoor heat exchanger; and Outside air amount control means for controlling the operation of the outside air introduction means so as to be the outside air introduction amount,
There is provided an operation control means for controlling the operation of the heat transport means so as to obtain a change in temperature and humidity between the intake air and the blown air set by the operation operation setting means.

Further, the operation setting means of the air conditioner according to claim 6 of the present invention is characterized in that the outside air enthalpy obtained from the outside air temperature detected by the outside air temperature detection means and the outside air humidity detected by the outside air humidity detection means is set to When the room air temperature is smaller than the room air enthalpy required from the room air temperature detected by the air temperature detection unit and the room air humidity detected by the room air humidity detection unit, the outside air is set to be introduced. .

Further, in the operation setting means for an air conditioner according to claim 7 of the present invention, the temperature and humidity of the outside air are greater than the line connecting the indoor air temperature and the target indoor air temperature and humidity in the psychrometric chart. When the temperature is low, the outside air is introduced to mainly reduce the temperature of the indoor air, and the heat exchange with the refrigerant in the indoor heat exchanger is set so as to mainly reduce the humidity of the indoor air. It is assumed that.

[0013] The operation setting means of the air conditioner according to claim 8 of the present invention is characterized in that, in the psychrometric chart, the temperature and humidity of the outside air are lower than the line connecting the indoor air temperature and the target indoor temperature and humidity. When the side, the outside air is introduced to mainly reduce the humidity of the indoor air, and the temperature is mainly set to decrease the temperature of the indoor air by heat exchange with the refrigerant in the indoor heat exchanger. Is what you do.

An air conditioner according to a ninth aspect of the present invention is provided with a heating means provided in an air flow path downstream of the indoor heat exchanger for heating the air flowing out of the indoor heat exchanger. Things.

[0015] The heating means of the air conditioner according to claim 10 of the present invention heats the air by heat exchange with a heater or a refrigerant.

Further, the outside air introduction means of the air conditioner according to claim 11 of the present invention has at least an outside air introduction port opening / closing mechanism, and the outside air introduction port opening / closing mechanism is opened / closed, or the outside air introduction port is opened or closed. The amount of outside air introduced is made variable by adjusting the opening of the opening and closing mechanism.

According to a twelfth aspect of the present invention, in the heat transfer means of the air conditioner, the compressor, the heat source side heat exchanger, the pressure reducing means, and the use side heat exchanger are connected by a refrigerant pipe to circulate the refrigerant. It comprises a refrigeration cycle, and is configured to transport cold or hot heat to the indoor heat exchanger by the refrigerant flowing through the refrigerant pipe by forming an indoor heat exchanger with the use side heat exchanger, or an indoor heat exchanger. The heat exchanger includes a heat exchanger different from the use-side heat exchanger, and has a circulation path for transporting cold or hot heat from the use-side heat exchanger to the another heat exchanger.

In the air conditioner according to the thirteenth aspect of the present invention, the refrigerant of the refrigeration cycle may be a refrigerant having a smaller temperature gradient than R22, a refrigerant having a higher pressure than R22, or R22.
This is a refrigerant having a lower pressure loss.

An air conditioner according to a fourteenth aspect of the present invention is characterized in that the refrigerant of the refrigeration cycle is a flammable refrigerant.

In the air conditioner according to a fifteenth aspect of the present invention, the refrigerant in the refrigeration cycle or the circulation path is water or antifreeze.

[0021] In the air conditioner according to claim 16 of the present invention, the lubricating oil to be charged into the refrigeration cycle is supplied with a compatible oil having mutual solubility with respect to the circulating refrigerant or a small amount with respect to the circulating refrigerant. It is a weakly compatible oil that only dissolves.

According to a seventeenth aspect of the present invention, in the control method for an air conditioner, the temperature and humidity of the outside air and the temperature and humidity of the room air change on the psychrometric chart according to the amount of the outside air introduced. The temperature and humidity air is taken as the suction air, the temperature and humidity air set as the target blowing air is taken as the blowing air, the change of the temperature and humidity from the suction air to the blowing air is taken as the control vector, and the control vector is extended by the refrigerant. The temperature and humidity of the intake air and the refrigerant temperature within the allowable range are set so as to reach the temperature and humidity of the saturation line within a range limited from the allowable range of the temperature.

[0023] Further, in the control method of an air conditioner according to claim 18 of the present invention, the control vector is extended so that the extension of the control vector reaches the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature. The temperature and humidity of the intake air and the refrigerant temperature within the allowable range are set so that the input of the device is minimized.

[0024] Further, in the control method of an air conditioner according to claim 19 of the present invention, the temperature and humidity of the suction air are set so that the enthalpy of the suction air is equal to or less than the enthalpy of the room air, and the amount of outside air introduced is controlled. It is characterized by controlling.

According to a twentieth aspect of the present invention, there is provided the air conditioner control method according to the first aspect, wherein the temperature and the humidity of the outside air are lower than an extension line of the change of the temperature and the humidity from the room air to the target blown air. The amount of outside air introduced is controlled so that the temperature of the intake air approaches the temperature of the target blown air or the inclination of the control vector increases.

[0026] In the method of controlling an air conditioner according to claim 21 of the present invention, the temperature and the humidity of the outside air are in a region on the lower humidity side than the extension line of the change of the temperature and the humidity from the indoor air to the target blowing air. The amount of outside air introduced is controlled so that the humidity of the intake air approaches the humidity of the target air, or the inclination of the control vector is reduced.

In the control method for an air conditioner according to a twenty-second aspect of the present invention, the temperature and humidity of the outside air and the temperature and humidity of the indoor air change on the psychrometric chart according to the amount of the outside air introduced. When the air with the temperature and humidity is taken as the suction air and the air with the temperature and humidity set as the target blowing air is taken as the blowing air,
If the extension of the change in temperature and humidity from the suction air to the blowing air deviates from the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature, the air having the same level of humidity as the target value of the humidity of the blowing air When the above-mentioned air is blown out,
The control vector is a change in temperature and humidity from the suction air to the blown air, and the temperature and humidity of the suction air are set so that the extension of the control vector reaches the temperature and humidity of the saturation line within a range limited from the allowable range of the refrigerant temperature. And setting the refrigerant temperature within the permissible range, and setting the heating amount so that when the temperature of the blown air is lower than the temperature of the target blown air, heating is performed so as to be the temperature of the target blown air. It is a feature.

Further, in the control method of an air conditioner according to claim 23 of the present invention, the control vector is extended so as to reach the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature, and The temperature and humidity of the intake air and the refrigerant temperature within the allowable range are set so that the input of the device is minimized.

Further, in the control method of the air conditioner according to claim 24 of the present invention, the temperature and the humidity of the intake air are changed between the temperature and the humidity of the outside air and the temperature and the humidity of the indoor air, or the humidity of the target blown air is changed. The temperature of the blown air is changed at the same level of humidity, and the control vector is set such that the total energy of the air conditioning capacity and the heating amount, which are the length of the control vector, is reduced.

Further, in the control method of an air conditioner according to claim 25 of the present invention, the enthalpy of the outside air is larger than the enthalpy of the room air, and the enthalpy of the outside air is smaller than the enthalpy of the room air. The introduction amount of outside air is set according to the outside air region and the outside air region.

Further, in the control method of an air conditioner according to claim 26 of the present invention, the temperature and the humidity of the outside air are lower than the extension line of the change of the temperature and the humidity from the room air to the target air. A region in which the temperature and humidity of the outside air is lower than the extension line of the change in temperature and humidity from the room air to the target blowing air, and an air conditioning capacity of the refrigeration cycle is set according to the region. It is assumed that.

Further, in the control method for an air conditioner according to claim 27 of the present invention, the outside air enthalpy is larger than the enthalpy of the room air, and the enthalpy of the outside air is smaller than the enthalpy of the room air. ,
And the area where the temperature and humidity of the outside air is lower than the extension line of the change in temperature and humidity from the room air to the target blowing air, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air Sets the amount of outside air introduced, the air-conditioning capacity of the refrigeration cycle, and the refrigerant temperature in accordance with the three regions, namely, the region on the lower humidity side than the extension of the change in temperature and humidity from the room air to the target blown air. It is characterized by doing.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an air conditioner, an air conditioner, and a method of controlling the air conditioner according to Embodiment 1 of the present invention will be described. FIG. 1 is an overall configuration diagram showing an air conditioner according to Embodiment 1 of the present invention. FIG. 2 shows an example of a configuration of an existing energy-efficient vapor compression refrigeration cycle for obtaining cold or warm heat. It is a refrigerant circuit diagram shown. The present invention is an air conditioner that cools or heats indoor air by performing air conditioning so that the temperature or humidity of indoor air approaches the target values of temperature and humidity, and introduces fresh outdoor air. Air conditioning is performed so that a comfortable indoor space can be obtained by effectively using the room. In particular, when the air conditioner is operated and controlled when the outside air is positively used, the air humidity is considered together with the air temperature. The basis for controlling the air temperature and the air humidity while associating them with each other is a well-known wet psychrometric chart.
Hereinafter, this psychrometric chart will be briefly described. FIG.
Is described in the literature (Refrigeration and Air Conditioning, 17th Edition, Showa 62
It is a figure which shows the outline | summary of a psychrometric chart described on page 199 of April 20, 2013, published by Yokendo. The humid air chart is a diagram showing the state of humid air, which is general air.The enthalpy i of the humid air and the absolute humidity x are plotted on the oblique axis, and many constant lines are drawn on the axis. 760mmH
g. If the dry bulb temperature is constant, i and x
Can be represented by a linear relationship, and the isothermal line (t-line) is a straight line. The angle between the isenthalpy line (i-line) and the x-ray is determined by appropriately selecting the memory of i and x and setting the line at t = 0 ° C to x-ray.
It is defined to be orthogonal to the line. A curve H is called a saturation line, and shows the absolute humidity and the temperature when the relative humidity is 100%. In the region to the right of the saturation line, the water vapor is in the state of superheated steam, and it is understood that when the temperature of the air decreases and the superheated steam is cooled, condensation starts at the saturation line. In this way, the change in the state of the humid air can be easily known in the humid air chart, and the outside air is positively introduced into the room based on the outside air state and the indoor air state actually detected based on the change. Use effectively for air conditioning.

In FIG. 1, reference numeral 1 denotes an indoor unit of an air conditioner mounted on a wall surface of a room, and 2 denotes a room to be air-conditioned. 3 is an indoor heat exchanger, 4 is a heating means, 5 is an indoor fan, and 6 is outside air introduction means for introducing outside air into, for example, the indoor unit 1 and is attached to, for example, an opening penetrated through a wall surface of the room. A fan 16 for sucking outside air and a damper 17 as an opening / closing mechanism for outside air introduction port are provided. The indoor unit 1 incorporates an indoor heat exchanger 3, a heating means 4, an indoor fan 5, and an outside air introduction means 6. The heating means 4 is, for example, a heater in the present embodiment, and is provided in an air flow path between the outlet of the indoor heat exchanger 3 and the inlet of the indoor fan 5 as shown in FIG. When the temperature of the air that has been heat-exchanged in the indoor heat exchanger 3 is too low, the heater 4 provided in the air flow path on the downstream side of the indoor heat exchanger 3 heats the air. The outside air introducing means 6 opens and closes the damper 17 at predetermined time intervals, electrically adjusts the degree of opening of the damper 17 stepwise or continuously, or changes the rotation speed of the fan 16. By changing the fan speed, the outside air introduction amount can be variably adjusted and controlled.

Reference numeral 7 denotes a refrigerant pipe, 8 denotes an outdoor unit, and the cold or hot heat obtained by the outdoor unit 8 is supplied to the refrigerant pipe 7.
To the indoor heat exchanger 3. Here, for example, the refrigerant pipe 7, the outdoor unit 8, and the indoor heat exchanger 3 are constituted by a vapor compression refrigeration cycle.

As shown in FIG. 2, the outdoor unit 8 includes
A compressor 21, a four-way valve 22 as a flow path switching means, an outdoor heat exchanger 23, an outdoor fan 24, and an expansion valve 25 as a pressure reducing means
The outdoor unit 8 and the indoor heat exchanger 3 are connected by a refrigerant pipe 7. As the refrigerant, for example, HCF
R22 as the C refrigerant is circulated in the refrigerant pipe. Less than,
The operation of the refrigerant circulation when the indoor heat exchanger 3 performs indoor cooling in this vapor compression refrigeration cycle will be described. When cooling the room, the outdoor heat exchanger 23 is operated as a condenser and the indoor heat exchanger 3 is operated as an evaporator, and the four-way valve 2 is operated.
2 is connected as shown by the solid line. The high-pressure gas refrigerant compressed by the compressor 21 flows from the discharge port of the compressor 21 to the outdoor heat exchanger 23 via the four-way valve 22, where the outdoor fan 24
Dissipates heat to the outside air blown by. Then, the refrigerant condenses and becomes a high-pressure liquid refrigerant and flows out of the outdoor heat exchanger 23. Thereafter, the refrigerant flows to the expansion valve 25 and is adiabatically expanded to become a low-pressure two-phase refrigerant. Furthermore, the low-pressure two-phase refrigerant circulates through the refrigerant pipe 7 and flows to the indoor heat exchanger 3, where the indoor air is cooled by exchanging heat with indoor air when collecting heat and evaporating. Then, the refrigerant flows out of the indoor heat exchanger 3 as a low-pressure gas refrigerant, and then passes through the refrigerant pipe 7 to the outdoor unit 8.
And returns to the suction port of the compressor 21 via the four-way valve 22. By such an operation, cold heat is obtained in the indoor heat exchanger 3. The amount of change in the temperature and humidity of the indoor air is determined by the evaporation temperature of the refrigerant in the indoor heat exchanger 3 and the temperature and humidity of the indoor air. The evaporation temperature has a feasible temperature tolerance. Generally, in a refrigeration cycle for performing air conditioning, the lower limit of the evaporation temperature is set to about 10 ° C. due to heat resistance of each device and measures against dew.

The operation of the refrigerant circulation during the operation when the indoor heat exchanger 3 heats the room will be described. When heating the room, the outdoor heat exchanger 23 is operated as an evaporator, the indoor heat exchanger 3 is operated as a condenser, and the four-way valve 2 is operated.
Numeral 2 switches the refrigerant circuit in the cooling operation and connects it as shown by the dotted line. The high-pressure gas refrigerant compressed by the compressor 21 flows from the discharge port of the compressor 21 to the indoor heat exchanger 3 of the indoor unit 1 through the refrigerant pipe 7 through the four-way valve 22, where heat is released and condensed. In doing so, the room is heated by exchanging heat with room air. Then, the refrigerant flows out of the indoor heat exchanger 3 as a high-pressure liquid refrigerant, and flows out of the expansion valve 25 of the outdoor unit 8.
Is adiabatically expanded into a low-pressure two-phase refrigerant at the outdoor heat exchanger 23.
Flows into Further, the refrigerant takes heat from the outside air blown by the outdoor fan 24 in the outdoor heat exchanger 23, evaporates, flows out as a low-pressure gas refrigerant, and returns to the suction port of the compressor 21 via the four-way valve 22. By such an operation, heat is obtained in the indoor heat exchanger 3.

The air conditioner shown in FIG. 1 is provided with means for detecting the air condition of the outside air and the indoor air. Reference numeral 9 denotes an indoor air temperature detecting means, and 10 denotes an indoor air humidity detecting means, each of which is provided, for example, at an indoor air intake of the indoor unit 1.
The temperature of the return air, which is the indoor air taken into the indoor unit, is detected by the indoor air temperature detecting means 9, and the humidity of the return air, which is the indoor air taken into the indoor unit 1 from the room 2, is detected by the indoor air humidity detecting means 10. To detect. Reference numeral 11 denotes an outside air temperature detection unit, and 12 denotes an outside air humidity detection unit, each of which is provided, for example, outside the room, around an intake port to the outside air introduction unit 6,
The outside air temperature detecting means 11 detects the temperature of the outside air taken into the indoor unit 1, and the outside air humidity detecting means 12 detects the humidity of the outside air taken into the indoor unit 1. 13 is an outlet air temperature detecting means, 14 is an outlet air humidity detecting means,
Each of them is provided, for example, at an air outlet from the indoor unit 1 to the room. 1 to indoor 2
Detects the humidity of the air that blows out. In addition, indoor heat exchanger 3
Indoor heat exchanger pipe temperature detecting means 18 provided in the refrigerant pipe
For example, the evaporation temperature of the refrigerant is measured. Also,
An electronic box 15 provided in the indoor unit 1 stores, for example, one or a plurality of microprocessors, and performs operations of an indoor air-conditioning load detection unit, an operation setting unit, an outside air amount control unit, and an operation operation control unit. This operation will be described later in detail.

FIG. 4 is an explanatory diagram showing the flow of air near the indoor heat exchanger 3 in the air conditioner according to the present embodiment. Here, T is temperature [° C.] and X is absolute humidity [kg].
/ Kg '] and V represent the air volume [m ³ / h]. Outside air OA (temperature TOA, humidity XOA, air volume VOA) is introduced into the suction side of the indoor unit 1, and return air RA (temperature TR)
A, humidity XRA, air volume VRA) and intake air KA
It flows into the indoor heat exchanger 3 as (temperature TKA, humidity XKA, air volume VRA + VOA). Hot or cold heat is transported to the indoor heat exchanger 3 by the refrigerant passing through the refrigerant pipe 7 as a heat transport means, and heat is exchanged when air flows around the refrigerant pipe in the indoor heat exchanger 3. The suction air KA that has exchanged heat with the refrigerant having the evaporation temperature ET [° C.] in the indoor heat exchanger 3 changes at least one of its temperature and humidity.
Depending on the case, air blown from the indoor unit 1 (temperature TSA, temperature TSA,
It flows out into the room as humidity XSA, air volume VRA + VOA). The blown air SA changes the sensible heat SH [kcal / h] of the indoor load while circulating in the room 2, that is, changes the temperature, and the latent heat LH [kcal / h] changes the absolute humidity. Return air R again under load
A is mixed with the outside air OA and flows into the indoor heat exchanger 3.

Here, the air flowing out after the heat exchange in the indoor heat exchanger 3 is referred to as outlet side air, and the blown air is the air blown from the indoor unit 1 into the room 2, for example, the heater 4. When heating with this, the temperature of the outlet air is different from the temperature of the blown air. In addition, the room is not usually closed, and extra room air naturally flows out of the room through a gap in the room, an exhaust port, or the like. In that case, since the interior 2 is pressurized, it is possible to prevent odor, dust, and the like from flowing from another adjacent room. Further, the room 2 may be configured to introduce outside air and mechanically exhaust indoor air with a ventilation fan or the like. In that case, the balance of the indoor pressure can be maintained, and the introduction of outside air can be performed smoothly and reliably.

Further, as shown in the block diagram of FIG. 5, the microprocessor of the electronic box 15 includes an indoor air-conditioning load detecting means 31, an operation setting means 32, and an outside air amount controlling means 33.
And the operation control means 34 are stored as a software program. The indoor air-conditioning load detection means 31 detects the indoor air-conditioning load QL. For example, the enthalpy iRA of the return air is obtained from the temperature TRA of the return air and the humidity XRA of the return air. Enthalpy of air blown out from XSA i
SA is obtained, and the indoor air-conditioning load Q is calculated based on the following equation 1.
L (SH, LH) and QL = SH + LH are detected. For example, at the time of cooling, the indoor air-conditioning load QL is obtained by calculation using Equation 1. QL = (VRA + VOA) · ρ · (iRA−iSA) (1) VRA: Return air volume VOA: Outside air volume ρ: Density iRA: Enthalpy of return air iSA: Enthalpy of blown air

The operation setting means 32 includes the outside air temperature and the outside air humidity (TOA, XOA) detected by the outside air temperature detecting means 11 and the outside air humidity detecting means 12, the indoor air temperature detecting means 9 and the indoor air humidity detecting means 10, respectively. The return air temperature and the return air humidity (TRA, XRA) are detected as the indoor air conditions detected by the target indoor air temperature and the target indoor air humidity (Tt, X) are set as the target indoor air conditions set by the indoor remote control switch and the like.
t), the indoor air-conditioning load QL detected by the indoor air-conditioning load detecting means 31 is input, and the outside air introduction amount VOA, the air-conditioning capacity Qe, the evaporation temperature ET, the heating amount W of the heater 4 as the heating means, and the indoor Information such as the total air volume VRA + VOA of the air passing through the heat exchanger 3 is set. The outside air introduction amount VOA is
For example, it is set in consideration of the mixing ratio x: y (x + y = 1) of the return air flow rate VRA and the outside air flow rate VOA. The setting method at this time will be described later in detail based on a flowchart. In addition, the evaporation temperature ET of the refrigerant flowing through the indoor heat exchanger 3 and the air conditioning capacity Qe are set from control vectors indicating changes in temperature and humidity between the intake air and the blown air.

The outside air amount control means 33 controls the operation of the outside air introduction means 6 so that the outside air introduction amount VOA set by the operation setting means 32 is obtained. More specifically, the outside air introduction amount can be varied by controlling the opening and closing of the damper 17 as an outside air introduction opening / closing mechanism, controlling the opening degree, or controlling the rotation speed of the fan 16 provided in the outside air introduction means 6. The outside air introduction amount is set, for example, as a ratio x: y between the return air RA and the outside air OA supply amount, and the outside air introduction amount VOA in the outside air introduction means 6 and the total airflow VRA + VOA from the indoor unit 1 are set to this ratio. And control. At this time, when the outside air is sucked into the indoor unit 1 at 100% of the total air volume, that is, when only the outside air is sucked into the indoor unit 1, for example, the fan 16 of the outside air introducing means is operated at the maximum high speed, and the indoor fan 5 is operated at the ultra-low speed at a low speed. The outside air can be taken into the room at a rate of 100%. When the intake of outside air is 100% or less, by adjusting the amount of outside air introduced and the total amount of air blown from the indoor unit, excess room air naturally flows out of the room through the gap between the rooms, and the ratio of outside air to the total amount of air Can be controlled. The total amount of air blown from the indoor unit 1 can be controlled by changing the rotation speed of the indoor fan 5.

The operation control means 34 controls the operation of the refrigeration cycle which is a heat transport means so that the air conditioning capacity Qe and the evaporation temperature ET set by the operation setting means 32 are obtained. To obtain the desired refrigerant temperature ET and the air conditioning capacity Qe. The operation of the refrigeration cycle is, specifically, the rotation speed control of the indoor fan 5 on the indoor side, the opening degree control of the expansion valve 25, the frequency control of the compressor 21, the rotation speed control of the outdoor fan 24, and the like on the outdoor side. is there. Further, when the set operation includes heating by the heater 4, on / off control of the heater 4 is performed. Equation 2 shown below is an example of a method for controlling the operation of the refrigeration cycle, as a target air conditioning capacity change amount ΔQe * and a target evaporation temperature change amount ΔE of the refrigerant.
This is an equation for calculating the compressor frequency change amount Δfz and the rotational speed change amount ΔNi of the indoor fan 5 from T *. The coefficients a, b, c, and d in this equation may be obtained in advance by simulation in consideration of experimental data and theoretical values and stored as data. This control is generally performed by VPM (vec
TOR pattern control, and shows the relationship between the increase or decrease of the compressor frequency fz, the rotation speed Ni of the indoor fan, the air conditioning capacity Qe, and the evaporation temperature ET. For example, when the frequency is increased (Δfz> 0), the air-conditioning capacity increases (ΔQe *> 0), and the evaporation temperature decreases (ΔET * <0). Further, for example, when the rotation speed of the indoor fan is increased (ΔNi> 0), the air conditioning capacity is increased (ΔQe *).
> 0), the evaporation temperature rises (ΔET *> 0).

[0045]

(Equation 1)

The indoor air-conditioning load detecting means 31, the driving operation setting means 32, the outside air amount control means 33, and the driving operation control means 34 may all be incorporated in one microprocessor as a computer program. May be built in different microprocessors.

The present embodiment is characterized in that the temperature and humidity of the outside air and the room air are detected, and the outside air introduction means 6 is used when the outside air can be used for air conditioning in the room based on the psychrometric chart.
To actively introduce outside air into the room.

FIG. 6 is an explanatory diagram showing an example of a change in the air state of room air when the air conditioner cools and dehumidifies room air on the psychrometric chart. This figure shows the general psychrometric chart described above, where the vertical axis represents the absolute humidity X [kg / kg '], and the horizontal axis represents the dry bulb temperature T [° C.].
Is shown. The air state is represented by one point on the humid air chart based on the temperature and the humidity. Here, this air state is referred to as the temperature and humidity of the air. The outside air enthalpy is calculated from the outside air temperature and the outside air humidity detected by the outside air temperature detection unit 11 and the outside air humidity detection unit 12, and the return air is calculated from the return air temperature and the return air humidity detected by the room temperature detection unit 9 and the indoor humidity detection unit 10. Calculate the enthalpy. Then, the outside air enthalpy is compared with the return air enthalpy. If the outside air enthalpy is smaller than the return air enthalpy, the outside air (outside temperature humidity OA) is introduced from the outside air introduction means 6. In this embodiment, whether or not to introduce outside air is determined by the enthalpy and the user's ventilation requirements, but here, a description will be given of changes in the temperature and humidity of the indoor air when the outside air is introduced. I do.

The intake air temperature / humidity KA, which is a mixture of the return air (return air temperature / humidity RA) introduced from the room 2 to the indoor unit 1 and the outside air (outside air temperature / humidity OA), is equal to the return air temperature / humidity RA. The temperature and humidity are on a straight line connecting the outside temperature and humidity OA, and the temperature and humidity change according to the amount of outside air introduced. Return air supply amount: Outside air supply amount = x: y The mixed air that has been introduced and has the suction air temperature and humidity KA so that x: y is exchanged with the refrigerant in the indoor heat exchanger 3. It is cooled and dehumidified. When the evaporation temperature of the indoor heat exchanger 3 (the temperature of the refrigerant pipe measured by the indoor heat exchanger pipe temperature detecting means 18, that is, the pipe temperature) is ET, the temperature is on a straight line connecting the suction air temperature humidity KA and the evaporation temperature ET. The air of the temperature and humidity, for example, the air temperature and humidity SA is discharged as the air on the outlet side of the indoor heat exchanger 3. In the present embodiment, the heater 4 is provided in the air flow path on the air outlet side of the indoor heat exchanger 3. If the air is excessively cooled to perform dehumidification in the indoor heat exchanger 3, the heater 4 is used. 4 can be heated.
The air that has passed through the heater 4 is blown out from the indoor unit 1 to the room as blown air (blowout air temperature and humidity SA). Thereafter, the indoor air-conditioning load QL (SH, LH) is applied to the air blown out from the indoor unit 1 and is taken in the indoor unit 1 again as return air (return air temperature / humidity RA). The return air temperature / humidity RA should be slightly different from the initial return air temperature / humidity and approach the target room air temperature / humidity t.

Here, in the initial operation, when only the return air is used as the intake air without introducing outside air and the refrigerant is operated at the evaporation temperature ET of the refrigerant, the discharge air enthalpy calculated from the discharge air temperature and the discharge air humidity, and the return air The indoor air conditioning load QL is estimated from the enthalpy of the return air calculated from the air temperature and the return air humidity, that is, the return air enthalpy on the suction side. X of this indoor load
The change in the axial direction is the sensible heat load SH, and the change in the y-axis direction is the latent heat load LH.

Finally, in order to set the return air temperature / humidity RA to the target indoor air temperature / humidity t, the target outlet air temperature / humidity SA * is calculated from the target indoor air temperature / humidity t and the indoor air conditioning load QL.
Is calculated. Then, the suction air temperature / humidity KA and the target evaporation temperature ET * are determined so as to achieve the target outlet temperature / humidity SA * while keeping the air conditioning capacity Qe as small as possible. By determining the intake air temperature / humidity KA, the mixture ratio of the return air temperature / humidity RA and the outside air temperature / humidity OA taken into the indoor unit 1 from the room 2 is determined, and the amount of outside air introduced is determined. In the control of the outside air introduction amount, the outside air introduction unit 6 controls the outside air introduction amount. For example, evaporation temperature ET
When the outside air temperature OA and the return air temperature / humidity RA are mixed to obtain the suction air temperature / humidity KA in order to realize the target outlet temperature / humidity SA * in *, the total amount of air sucked into the indoor heat exchanger 3 (indoors) The ratio of the amount of outside air introduced to the total amount of air blown into the room from the unit) is given by | KA-RA | / | OA-RA | = y / (x + y) = VOA / (VOA + VRA). The operation of the refrigeration cycle is controlled according to the evaporation temperature ET * and the air conditioning capacity Qe at this time. Here, since the air conditioning capacity Qe is made as small as possible, the input to the air conditioner can be minimized, and energy is saved.

Here, considering the air condition before and after the indoor heat exchanger 3, while the suction air having the suction air temperature and humidity KA flows into the indoor heat exchanger 3 and flows outside the refrigerant pipe in the indoor heat exchanger 3. It is assumed that the heat exchange occurs with the refrigerant having the evaporation temperature ET * flowing through the refrigerant pipe and flows out of the indoor heat exchanger 3 as the outlet-side air temperature and humidity SA. In the psychrometric chart, the air with the temperature and humidity SA at a point on a straight line connecting the point of temperature and humidity KA and the point of the temperature ET * on the saturation line flows out as the air on the exit side of the indoor heat exchanger 3. Conversely, if it is desired that the suction air with the temperature and humidity KA flow into the indoor heat exchanger 3 and the air on the outlet side with the temperature and humidity SA be discharged, the temperature and humidity KA on the psychrometric chart are used.
It is sufficient to circulate through the indoor heat exchanger 3 a refrigerant having a temperature at a point where a straight line extending from the control vector and a saturation line intersect with each other so that the temperature changes from the temperature to the temperature / humidity SA. In the present embodiment, in order to easily control the operation of the indoor heat exchanger 3, a target indoor air temperature / humidity t and a target outlet air temperature / humidity SA * which is a target of the air to be blown out from the indoor air conditioning load QL are set. Control is performed such that the temperature and humidity of the air blown from the indoor heat exchanger 3 approach the target air temperature and humidity SA *.

However, there is a limit to the slope of the control vector that can be realized, and SHFmin ≦ SHF ≦ SHFmax (maximum 1) within the allowable range of the sensible heat ratio (SHF) of the refrigeration cycle. Here, the sensible heat ratio (SHF) is represented by Equation 3, and is expressed as gas H ₂ O in the total heat amount Q [kcal / h] (sensible heat + latent heat) used for lowering the temperature of air. Of heat Q used to condense water into liquid H ₂ O
It is the ratio of LH [kcal / h] (latent heat) subtracted. SHF = (Q−QLH) / Q = sensible heat / (sensible heat + latent heat) (3) Therefore, the operation at SHFmax is a high sensible heat operation and SHFm.
The operation in is the maximum dehumidification operation. For example, if the dehumidification amount is 0, SHF = 1 (high sensible heat operation), and if only dehumidification can be performed without lowering the room temperature, SHF = 0 (maximum dehumidification operation).
It is. Actually, there is a limit to the dehumidifying capacity. In terms of the psychrometric chart, when the extension line of the control vector does not intersect with the saturation line, the limit of the dehumidifying capacity is exceeded, and this is a state that cannot be realized. That is, when a straight line connecting the intake air temperature and humidity KA to the indoor heat exchanger 3 and the outlet side air temperature and humidity SA is extended on the psychrometric chart, this straight line does not intersect with the saturation line. At this time, even if heat is exchanged with the refrigerant, air with the temperature and humidity SA cannot be obtained at the outlet side of the indoor heat exchanger 3.
As described above, in general, in a refrigeration cycle for air conditioning, the lower limit of SHF is limited by setting the lower limit of the evaporation temperature to about 10 ° C from the heat resistance of each device and measures against dew. There is also.

In the air conditioner according to the present embodiment, the basic concept of a driving method for actively introducing and effectively using outside air to obtain a comfortable indoor space will be described. Suction air temperature and humidity KA, which is a mixture of return air temperature and humidity RA and outside air humidity OA
Are the intake air temperature and humidity KA and the target air temperature and humidity SA
* Select so that the enthalpy difference of * becomes small. The gradient of the control vector from the intake air temperature / humidity KA to the target outlet air temperature / humidity SA * is within the allowable range of the sensible heat ratio (SHF) of the refrigeration cycle. Choose one with a small enthalpy difference. When the control vector cannot be realized due to insufficient dehumidification even in the maximum dehumidifying operation SHFmin of the refrigeration cycle, the temperature of the target blow-off air is lowered to operate so as to satisfy the humidity, and the outlet side air flowing out of the indoor heat exchanger 3 is heated. To control the air to be at the target air temperature and humidity SA *. That is, the refrigerant temperature of the indoor heat exchanger 3 is set so as to be the humidity of the target blown air, and the outlet side air that has exchanged heat with the refrigerant at that temperature in the indoor heat exchanger 3 is lower in temperature than the target blown air. In some cases, it is heated to the temperature of the target blowing air.

One of the above ideas is as follows. The enthalpy difference is set to be as small as possible, so that the total sum of the inputs to the compressor 21, the outdoor fan 24, the indoor fan 5 and the like of the air conditioner can be minimized, and energy saving without performing unnecessary operation. Become. Furthermore, 3. In the case where the heating means is used, when the air exchanged in the indoor heat exchanger is heated by the heating means, the total energy of the heat transport capacity and the heating amount for obtaining the refrigerant temperature in the indoor heat exchanger 3 is The amount of outside air introduced is set to be small, and operation control is performed to save energy. That is, the operation control is performed so that the total amount of the air conditioning capacity Qe and the input energy to the heater 4 is reduced.

For this purpose, the operation setting step performed by the operation setting means 32 is to determine whether or not the outside air can be used for air conditioning in the room and to set the operation based on the determination. Accordingly, each device of the air conditioner is actually operated by an operation control step performed by the outside air introduction amount control means 33 and the operation control means 34.
In the present embodiment, three areas are divided according to the outside air state on the psychrometric chart, the processing is performed on each area, and the outside air introduction amount, the air conditioning capacity, and the heating amount are set. FIG. 7 is an explanatory diagram showing the area of each zone in the psychrometric chart, and FIG. 8 is a flowchart showing a processing procedure of a zone division part of the outside air utilization method according to the outside air state. As shown in FIG. 7, return air temperature / humidity RA, target outlet air temperature / humidity SA *,
How to use the outside air is divided into three zones depending on the state of the outside air temperature and humidity OAx (x = 1 to 3). The zone is a region above the isenthalpy line (straight line A) passing through the return air temperature / humidity RA and when the outside air temperature humidity OA1 is higher in enthalpy than the return air temperature / humidity RA.
In the zone, the outside air temperature and humidity OA2 return air temperature and humidity R
Lower enthalpy than A and return air temperature and humidity RA
It is an area on a lower temperature side than a line (straight line B) connecting the target blowout temperature and humidity SA *. The zone is such that the outside air temperature and humidity OA3 are lower enthalpy than the return air temperature and humidity RA, and RA
Is a region on the lower humidity side than the line (straight line B) connecting the line * and SA *.

In the flowchart of FIG. 8, the return air temperature and humidity RA and the return air enthalpy are calculated from the temperature and humidity of the return air detected by the indoor temperature detecting means 9 and the indoor humidity detecting means 10 (ST1, ST2: indoor air temperature). Humidity detecting step), the outside air temperature humidity OA and the outside air enthalpy are calculated from the outside air temperature and humidity detected by the outside air temperature detecting means 11 and the outside air humidity detecting means 12 (ST3, ST).
4: Outside temperature / humidity detection step). Next, a target indoor air temperature / humidity is calculated from the target temperature and the target humidity (ST5: target indoor air temperature / humidity setting step). Next, in ST6 (indoor air-conditioning load detection step), a target outlet air temperature and humidity SA * is set from the return air temperature and humidity RA and the indoor air-conditioning load QL detected in advance. At ST7, the outside air enthalpy is compared with the return air enthalpy. If the outside air enthalpy is greater than the return air enthalpy, the zone is operated (ST9). As a result of comparing the outside air enthalpy with the return air enthalpy in ST7, if the outside air enthalpy is smaller than or equal to the return air enthalpy, a straight line B connecting the return air temperature / humidity RA and the target outlet air temperature / humidity SA * is drawn. Then, it is determined whether the outside air temperature and humidity OA is above or below this straight line B (ST8). The zone (ST10) when the outside air temperature humidity OA is above the straight line B, that is, in a region lower than the return air temperature / humidity RA, and when the outside air temperature humidity OA is in the region below the return air temperature / humidity RA, the zone (ST10). ST11).

In practice, for example, in order to know the positional relationship between two points on a plane, it is possible to calculate the cross product of the two points and determine the sign of the result. The cross product is two vectors, C (c1,
c2) and D (d1, d2) can be calculated by the formula of CxD = c1xd2-d1xc2. By utilizing this, it is possible to easily know which of the three zones the outside temperature / humidity OA is located in. Note that C and D are vectors and are quantities having a magnitude and a direction.

Next, processing for setting the outside air introduction amount, the air conditioning capacity, and the heating amount in each of the three regions will be described. FIG. 9 is a flowchart showing a processing procedure when the outside air temperature OA1 is in a zone area, that is, when the outside air temperature OA1 is higher in enthalpy than the return air temperature humidity RA. In this case, the introduction of outside air increases the air-conditioning load. Therefore, when importance is placed on the energy saving effect, no outside air is introduced. For example, by closing the damper 17 and stopping the fan 16, the outside air introducing means 6 is closed to circulate only return air from the room. However, outside air may be introduced when ventilation is required due to a user request. Further, even if the setting is made such that the outside air is not introduced, the outside air introduction amount may not actually become 0 due to a gap in a wall or the like, and the outside air introduction means 6 may be operated so as to minimize the outside air introduction amount. .

In the processing flow, it is determined whether or not ventilation is required in ST21, and if ventilation is required, the outside air introduction amount is reduced by a predetermined amount for ventilation, for example, the damper 17 of the outside air introduction means 6 is controlled. The fan 16 is fully opened or the fan 16 is rotated at a high speed (ST22). Then, as the suction air temperature and humidity KA of the indoor heat exchanger 3, the temperature and humidity of the mixed air in which the return air and the outside air are mixed are set (ST23). On the other hand, when ventilation is not required, the outside air introduction means 6 is closed to set the outside air introduction amount to 0 (ST24), and the suction air temperature and humidity KA of the indoor heat exchanger 3 sets the return air temperature and humidity RA ( ST25). In ST26, it is determined whether or not the control vector can be realized, that is, whether or not the SHF of the refrigeration cycle is within the allowable range. If the extension line of the control vector to the intake air temperature / humidity KA and the target outlet air temperature / humidity SA * intersects the saturation line and is within the allowable range of the evaporation temperature, ST27
Is performed. In ST27, a control vector for determining the air-conditioning capacity is set based on the suction air temperature / humidity KA and the target outlet air temperature / humidity SA * on the humid air chart. That is, a vector connecting the intake air temperature / humidity KA and the target outlet air temperature / humidity SA * is set, and the temperature at the intersection of the extension line of this vector and the saturation line is set as the refrigerant temperature of the indoor heat exchanger 3. S
If the extension line of the control vector does not intersect with the saturation line in the judgment of T26, it is out of the allowable range, and the SHFm
In the in operation, the outlet side air having the same level of humidity as the target humidity flows out of the indoor heat exchanger 3 and is heated to the target temperature by the heater 4 so that the air-conditioning capacity and the refrigerant temperature are obtained so as to obtain the target outlet air temperature and humidity SA *. And the heating amount of the heater are set. ST61
In the (operation control step), the outside air having the outside air amount set by the outside air amount control unit 33 is introduced into the indoor unit 1, and the refrigeration cycle is operated based on the control vector set by the operation operation control unit 34. Further, the heater 4 is operated as needed. Actually, each component of the air conditioner, such as the operating frequency of the compressor 21, the opening degree of the expansion valve 25, the rotation speed of the indoor fan 5 and the outdoor fan 24, the heater 4, and the outside air introducing means 6, is operated. You. ST21-
By repeating ST28 and ST61 in a cycle of a predetermined time, for example, about 1 minute, the indoor air condition gradually becomes the target indoor air temperature and humidity t, and the air conditioning of the indoor 2 is performed.

The zone has a lower enthalpy than the return air temperature / humidity RA and a lower temperature side than a line B connecting the return air temperature / humidity RA and the target outlet air temperature / humidity SA *.
That is, control when the outside air temperature and humidity OA2 is in the zone above the straight line B in this zone will be described.
In other words, in the zone of this zone, the rate of change of the humidity difference with respect to the temperature difference between the outside air and the return air in the area where the outside air enthalpy is smaller than the return air enthalpy and the temperature of the outside air is lower than the temperature of the return air. ,
This is an area excluding the outside air temperature and humidity where the rate of change of the humidity difference with respect to the temperature difference between the target outlet air and the return air is larger. When the outside air is in the zone, the low-temperature characteristics of the outside air are used to introduce the outside air and mainly use it for lowering the temperature of the indoor air, and mainly use the refrigeration cycle to exchange heat with the refrigerant in the indoor heat exchanger 3. Control to reduce the humidity of the indoor air. If the temperature to be lowered by outside air is not enough, lower the temperature by a refrigeration cycle.

FIG. 10 is a flowchart showing a processing procedure when the outside temperature and humidity OA2 is in the zone area.
FIG. 11 and FIG. 12 are explanatory diagrams each showing how to determine the control vector. In ST31, it is determined whether a line extended by connecting the return air temperature / humidity RA and the target outlet air temperature / humidity SA * intersects with the saturation line, that is, whether the extension line reaches a saturation line indicating a refrigerant temperature within an allowable range. ST32, ST33, FIG. 1
This is indicated by 1. In this case, the temperature / humidity K of the mixed air is set so as to operate at the sensible heat ratio SHFmin where the dehumidifying capacity is the maximum.
A2 is set as the suction air temperature and humidity KA (ST3
2). The temperature and humidity of the suction air mixed with the room air by introducing the outside air are represented by the outside air temperature humidity OA2 and the return air temperature humidity RA
The temperature and humidity change in relation to each other according to the amount of outside air introduced, and the temperature and humidity on the straight line connecting OA2 and RA in the psychrometric chart as shown in FIG. So this OA2-RA
Considering a control vector connecting the above point, the target outlet air temperature / humidity SA *, and the evaporation temperature within the allowable range on the saturation line,
When a control vector having the maximum dehumidifying ability, that is, a control vector having a large change in humidity relative to a change in temperature is selected, the intake air temperature and humidity become KA2. At this time, the internal dividing point KA2 between RA and OA2
The outside air introduction amount is set by the ratio of (ST33), and then ST
39 is performed.

Here, selecting a control vector having a large change in humidity with respect to a change in temperature means that the temperature of the intake air approaches the temperature of the target blown air, or the gradient of the control vector becomes large. In this case, the low-temperature characteristics of the outside air are used to the maximum extent.

The method of determining the control vector when the control vector does not cross the saturation line in ST31 is described in ST34 to ST38 in FIG.
Indicated by. In this case, the extension line from the return air temperature / humidity RA to the target outlet air temperature / humidity SA * deviates from the saturation line indicating the allowable range of the refrigerant temperature. * Because it is not possible to directly cool and dehumidify the refrigeration cycle,
Cool and dehumidify within the allowable range of F. That is, OA2 and RA
On the OA2-RA including the target air temperature and humidity S
The refrigeration cycle was operated as a control vector by connecting the same level of humidity as A * (on the line parallel to the x-axis passing through SA *) and the allowable temperature on the saturation line, and the refrigeration cycle was overcooled. In this case, the outlet side air flowing out of the indoor heat exchanger 3 is heated by the heater 4, and the target outlet air temperature and humidity SA *
Get. At this time, when importance is placed on energy saving, when the return air temperature / humidity RA is cooled and reheated, and when the outside temperature / humidity OA2 is cooled and reheated, the air conditioning capacity which is an input to the air conditioner is determined. The sum of the inputs to the heater 4 at the time of reheating is compared, and the operation is performed with the smaller total input energy. Here, the outside air introduction amount is set to 0% or 100% of the intake air amount. For example, even if the outside air introduction amount is set to 0% or 100%, the configuration or installation of the outside air introduction means 6 is actually performed. Depending on the condition, it may not be completely 0% or 100%. In this case, the operation may be performed so that the outside air introduction unit 6 can minimize or maximize the introduction of outside air.

In the processing flow, the return air temperature / humidity RA is cooled and dehumidified and reheated in ST34, and the target outlet air temperature / humidity S
The air conditioning capacity at the time of A * and the input energy to the heater 4 are calculated to be E (RA). The input energy to the heater 4 is calculated and set as E (OA2). In ST36, E (RA) and E (O)
A2) is compared, and the smaller of the total input energy is selected in ST37 and ST38, and the outside air introduction amount (0 or 10) is selected.
0%: minimum or maximum), the suction air temperature / humidity KA, the heater input amount, and the like.

In ST39, a control vector for determining operation control is obtained from the intake air temperature / humidity KA and the target outlet temperature / humidity SA *. In ST61 (operation control step), the refrigeration cycle is operated based on the control vector determined by the outside air amount control means 33 and the operation operation control means. In addition, heating is performed as necessary. In fact, the operating frequency of the compressor,
Each component of the air conditioner is operated according to the rotation speed of the indoor and outdoor fans, the input of the heater 4, and the amount of outside air introduced. By repeating ST31 to ST39 and ST61 for a certain period of time, for example, in a cycle of about 1 minute, the indoor air condition gradually becomes the target indoor air temperature and humidity t, and the air conditioning of the indoor 2 is performed.

The zone has a lower enthalpy than the return air temperature / humidity RA, and a lower humidity side than a line B connecting the return air temperature / humidity RA and the target outlet air temperature / humidity SA *.
That is, the control when the outside air temperature and humidity OA3 is in the area below the straight line B in this zone will be described.
In other words, in the area of this zone, in the area where the outside air enthalpy is smaller than the return air enthalpy and the outside air humidity is lower than the return air humidity, the rate of change of the humidity with respect to the temperature of the outside air and the return air is the target. This is a region excluding the outside air temperature and humidity, which is smaller than the rate of change of humidity with respect to the temperature of the blown air and return air. When the outside air is in the zone, the low humidity characteristic of the outside air is used to introduce the outside air and mainly use it for lowering the humidity of the indoor air. Then, control is performed to lower the temperature of the indoor air. If the humidity is not enough due to outside air, lower the humidity with a refrigeration cycle.

FIG. 13 is a flowchart showing a processing procedure when the outside temperature and humidity OA3 is in the zone area.
FIG. 14, FIG. 15, and FIG. 16 are explanatory diagrams showing how to determine the control vector. In this case, the suction air temperature and humidity K
A has the smallest enthalpy when it is the same as the outside temperature and humidity OA3. Therefore, in ST41, it is determined whether or not a line extended by connecting the outside air temperature and humidity OA3 and the target outlet air temperature and humidity SA * intersects with the saturation line, that is, whether or not this extension line reaches a saturation line indicating a refrigerant temperature within an allowable range. ST42 to ST45 and FIGS. 14 and 15 show how to determine and determine the control vector when they intersect. In this case, the refrigeration cycle is set to operate at the sensible heat ratio SHFmax, utilizing the low humidity characteristics of the outside air. The temperature and humidity of the suction air mixed with the room air by introducing the outside air change between the outside temperature humidity OA3 and the return air temperature and humidity RA in relation to the temperature and humidity according to the amount of outside air introduced. OA3 in the psychrometric chart shown in FIG.
And the temperature and humidity on the straight line connecting RA and RA. So this OA
Considering a control vector connecting the point on 3-RA, the target outlet air temperature / humidity SA *, and the evaporation temperature within an allowable range on the saturation line, the dehumidifying ability is minimum, that is, the change in humidity with respect to the change in temperature is small. When the control vector is selected, OA3 in the case of FIG. 14 and KA3 having the same humidity as SA * in the case of FIG. 15 become the intake air temperature and humidity KA.

In the processing flow, the absolute humidity of the outside air is compared with the absolute humidity of the target blown air in ST42. Then, the outside air temperature and humidity OA3 is set to the suction air temperature and humidity KA (ST43). At this time, if the outside air introduction amount cannot be actually set to 100%, the outside air introduction means 6
And the maximum amount that can be introduced. If the absolute humidity of the target blown air is higher than the outside air in the comparison in ST42, as shown in FIG.
A is set (ST44). At this time, the outside air introduction amount is set by the ratio of RA and the inner dividing point KA3 of OA3 (ST45),
Thereafter, the process of ST51 is performed.

Here, selecting a control vector having a small change in humidity with respect to a change in temperature means that the humidity of the intake air approaches the humidity of the target blown air or the gradient of the control vector becomes small. In this case, the low humidity characteristics of the outside air are used to the maximum extent.

The method of determining the control vector when the control line does not cross the saturation line in ST41 is described in ST46 to ST50, FIG.
Indicated by. In this case, the extension line from the outside air temperature and humidity OA3 to the target outlet air temperature and humidity SA * deviates from the saturation line indicating the allowable refrigerant temperature, and the outside air temperature and humidity OA
Since the cooling air dehumidification cannot be performed directly from Step 3 to the target outlet air temperature and humidity SA *, the cooling air dehumidification is performed within the allowable range of the SHF of the refrigeration cycle. That is, OA3 including OA3 and RA
-A point on RA and the same level of humidity as target outlet air temperature / humidity SA * (a line passing through SA * and parallel to the x-axis)
And the evaporating temperature within the allowable range on the saturation line, the refrigeration cycle is operated as a control vector, and the heater 4 heats the outlet-side air flowing out of the indoor heat exchanger 3 when it is overcooled, so that the target blowing is performed. Obtain the air temperature and humidity SA *. At this time, when importance is placed on energy saving, the return air temperature / humidity RA is cooled and reheated, and the outside air temperature / humidity OA
When cooling and reheating the air conditioner 3, the air conditioner, which is an input to the air conditioner, and the sum of the input to the heater 4 at the time of reheating are compared, and the operation is performed with the smaller total input energy.

In the processing flow, the return air temperature / humidity RA is cooled and dehumidified and reheated in ST46, and the target blow air temperature / humidity S
The air-conditioning capacity at the time of A * and the input energy to the heater 4 are calculated to be E (RA). The input energy to the heater 4 is calculated and set to E (OA3). E (RA) and E (O) in ST48
A3) is compared, and the smaller of the total input energy is selected in ST49 and ST50, and the outside air introduction amount (0 or 10) is selected.
0%: minimum or maximum), the suction air temperature / humidity KA, the heater input amount, and the like.

In ST51, a control vector for determining operation control is obtained from the intake air temperature / humidity KA and the target outlet temperature / humidity SA *. In ST61 (operation control step), the refrigeration cycle is operated based on the control vector determined by the outside air amount control means 33 and the operation operation control means. Heating is performed if necessary. Actually, each component of the air conditioner is operated according to the operating frequency of the compressor, the rotational speeds of the indoor and outdoor fans, the input of the heater 4, and the amount of outside air introduced. ST41 to ST51, ST61 for a certain time,
For example, by repeating a cycle of about 1 minute, the indoor air condition gradually becomes the target indoor air temperature and humidity t, and the air conditioning of the indoor 2 is performed.

In the above, it is divided into whether the outside air is introduced or not in the zone, the other zone, and the zone. In the case of one zone, the outside air enthalpy is larger than the return air enthalpy, so air conditioning is performed with a refrigeration cycle without introducing outside air, and the other zone,
In the case of, since the outside air enthalpy is smaller than the return air enthalpy, outside air is introduced as much as possible and used for indoor air conditioning. In addition, the operation can be divided into zones in which the operation having a large dehumidifying capacity or the high sensible heat operation is performed based on the air conditioning capacity of the refrigeration cycle. In the case of one zone, the refrigeration cycle operates with a large dehumidifying capacity by utilizing the low temperature characteristics of the outside air. In the case of the other zone, the refrigeration cycle performs a high sensible heat operation by utilizing the low humidity characteristics of the outside air.
In this way, by dividing the zone into zones based on the temperature and humidity of the outside air, and by setting controls appropriate for each zone, the amount of outside air introduced is optimized for the air conditioning target, and the maximum use of outside air is achieved without wasteful work. Energy can be saved.

As described above, in order to actively introduce outside air in accordance with the outdoor air condition and use it effectively for air conditioning, and to minimize the energy of air to be heat-treated by the air conditioner. Energy can be saved while introducing fresh outside air. In particular, since the fine control is performed in consideration of not only the temperature of the outside air and the indoor air but also the humidity, a more comfortable indoor space can be obtained. In addition, since the target indoor air state is approached while controlling while changing the temperature and the humidity in relation to each other, the target indoor space can be obtained more quickly, and energy can be saved.
In addition, by keeping the indoor air fresh with fresh outside air, it is possible to secure good quality indoor air, and it can be expected that this will have a positive effect on the health of indoor people or animals and plants.

As an example of the energy saving effect, when the outside air temperature and humidity are low and high humidity in the zone, the load when the room is cooled using the low temperature of the outside air and the maximum dehumidification operation is performed in the refrigeration cycle is roughly calculated. View. In the case of an outside temperature of 21 ° C. and an absolute humidity of 12 g / kg (approximately 77% relative humidity), which frequently appear frequently in June, a target indoor temperature and humidity of about 8 tatami mats is set at 26 ° C. and 12.8 g / kg (relative humidity). It is assumed that there are two persons in this room at a humidity of about 60%). Sensible heat ratio SHFm
In is when the introduction ratio of the return air and the outside air is 0.1.
65: 0.35, load ratio by enthalpy (enthalpy difference between intake air and target blown air) /
(Enthalpy difference between return air and target outlet air)
Is 0.5. That is, as in the present embodiment, when the outside air is actively introduced, for example, when the outside air is introduced by 35% of the total air volume of the indoor unit to perform the air conditioning, the indoor air is introduced without introducing the outside air as in the related art. Air return can be conditioned with only half the energy required for air conditioning by circulating only return air from the intake air.

In the above description, the control in the case of the operation with emphasis on energy saving has been described. However, if a predetermined ventilation volume is required, the same control can be performed after securing the ventilation volume. Further, the heater 4 is not always necessary, and may not be particularly provided. In this case, when the control vector cannot be realized due to insufficient dehumidification even with the maximum dehumidification operation SHFmin of the refrigeration cycle, the target blown air is operated so as to satisfy the temperature by increasing the humidity thereof, and the outlet air flowing out of the indoor heat exchanger 3 is discharged. It is also possible to provide a dehumidifying means for dehumidifying and control so as to reach the target outlet air temperature and humidity SA *. Further, the heating means 4 may not be provided inside the indoor unit 1, and the air flow path downstream of the indoor heat exchanger 3, that is, the outlet of the air flowing out of the indoor heat exchanger 3, the target indoor air temperature and humidity, What is necessary is just to be the position which heats the air which flows through the air flow path between the area | regions which want to do, for example, the living area of a person.

The fan 16 of the outside air introducing means 6 is not necessarily provided. If at least the outside air introducing port opening / closing mechanism such as the duct 17 is provided, the outside air introducing means 6 capable of adjusting the introduction amount is constituted. . Further, if an outside air treatment filter is provided on the entire surface of the outside air introduction port of the outside air introduction means 6 to prevent pollen, dust, dust, and the like mixed in the outside air from being taken into the room, the indoor space is made healthier and more comfortable. Can be kept. If at least a part of the outside air treatment filter is made of a material that adsorbs offensive odor or the like, it is possible to prevent the offensive odor mixed with the outside air from entering the room on a garbage collection day or the like.

Although the above description has been made with reference to the psychrometric chart, this is adopted because it is easy to grasp both the temperature and the humidity as the air condition. It goes without saying that each physical quantity has a correlation with each other, so that it can be obtained by calculation. Further, the relationship between the temperature and the humidity may be stored in a memory of the microprocessor as a chart in advance.

In this embodiment, the air condition involved in control when air conditioning the room is the return air (R
A), the outside air (OA), the intake air (KA), and the blown air (SA), respectively, in terms of temperature and humidity. These air conditions are related to each other. Therefore, all of these values may be obtained by calculation without actually detecting them. Further, it may be calculated by other methods, for example, from information such as the frequency of the compressor, the evaporation temperature, the tube temperature, and the rotation speed of the fan. In the above description, return air is used as the indoor air condition,
The temperature and humidity of the blown air and the outside air are detected by measurement,
The temperature and humidity of the intake air are calculated and detected using the measured values. Also, instead of detecting the temperature and humidity of the outside air by measurement, the temperature and humidity of the intake air in which the outside air and the return air are mixed are measured and detected, and the detected value, the outside air volume VOA, and the return air volume VRA are used to calculate the outside air volume. May be calculated. Further, the temperature is also related to the indoor load and air flow, and can be indirectly obtained from these. In addition, the humidity may be affected by the season or weather, etc.In some cases, it is not necessary to perform strict measurement when performing indoor air conditioning. , May be detected by inference or calculation indirectly from other parameters. In addition, if the configuration is such that both the state of the return air and the state of the blown air are measured, the indoor air conditioning load can be accurately grasped. Alternatively, the air condition of one of the return air and the blown air may be detected by measurement, and the other may be estimated.

Further, the temperature and humidity of the return air are detected as the indoor air condition. However, the present invention is not limited to the return air. The temperature and humidity of the place may be detected and used. In the case of a predetermined place in the room, the air condition while the indoor air-conditioning load is being received is detected. However, if the indoor air-conditioning load from the measurement location is grasped, the control can be similarly performed.

Embodiment 2 In the first embodiment, warm or cold heat is supplied to the indoor heat exchanger 3 by a vapor compression refrigeration cycle. However, in the present embodiment, warm or cold heat is supplied to the indoor heat exchanger 3 by another configuration. It was made. The outdoor unit 8 or another location is provided with, for example, a vapor compression refrigeration cycle as a heat source device, and heat or cold generated by the heat source device is transported to the indoor heat exchanger 3 by heat transport means.

FIG. 17 is a refrigerant circuit diagram showing the configuration of the heat transport means according to the present embodiment. In the figure, the compressor 2
1, a four-way valve 22, a heat exchanger 23, a fan 24, and, for example, an expansion valve 25 and a heat exchanger 26 are sequentially connected by refrigerant piping by a pressure reducing means to constitute a vapor compression refrigeration cycle. This refrigeration cycle is used as a heat source side refrigerant cycle, and a heat exchanger 26, a pump 27 as a fluid transfer means, and an indoor heat exchanger 3 are connected by a refrigerant pipe 7 as a use side refrigerant cycle. One heat exchanger 23 constituting this heat source side refrigerant cycle is a gas-liquid heat exchanger,
The other heat exchanger 26 is constituted by a liquid-liquid heat exchanger, for example, a double tube heat exchanger. In the heat exchanger 26, a refrigerant such as R22 circulating in the heat source side refrigerant cycle and a use side refrigerant circulating in the use side refrigerant cycle,
For example, heat exchange occurs between water and an antifreeze such as ethylene glycol, and the refrigerant in the use-side refrigerant cycle is transported by the pump 27 through the refrigerant pipe 7 to the indoor heat exchanger 3 where it is used for indoor air conditioning.

Here, the refrigerant of the use-side refrigerant cycle and the refrigerant of the heat-source-side refrigerant cycle are separated, and the use-side refrigerant cycle uses, for example, sensible heat to transport heat. It is composed of different materials such as a refrigerant that transports heat using latent heat. By using a refrigerant with high energy efficiency on the heat source side and a refrigerant that uses sensible heat that has no problem in use in ozone depletion and global warming on the user side,
Although the energy efficiency is good, the amount of the refrigerant which has a problem in use is minimized. In addition, if a flammable refrigerant such as R290 is used as the refrigerant in the heat source side refrigerant cycle and a safe refrigerant such as water or antifreeze is used as the refrigerant in the use side refrigerant cycle, the heat source can be located far from the room without fire. A side refrigerant cycle can be installed, and safety is further improved.

As the refrigerant of the heat source side refrigerant cycle, it is needless to say that the same refrigerant as the utilization side refrigerant cycle, that is, a natural refrigerant such as water, or any of antifreeze such as ethylene glycol, propylene glycol and D-sorbitol is used. One or more of them by several tens% by weight
An aqueous solution containing the following may be used. In this case, although the energy efficiency is reduced, an air conditioner having no problem in terms of global environment preservation and handling can be configured. In addition, although one heat exchanger 23 of the heat source side refrigeration cycle is constituted by a gas-liquid heat exchanger, it is not limited to this.

The following can be said in common with the configuration of the heat transport means shown in FIGS. 2 and 17.
As a refrigerant used in the air conditioner, a chlorofluorocarbon-based refrigerant such as HCFC (hydrochlorofluorocarbon) or HFC (hydrofluorocarbon), an HC (hydrocarbon-based) refrigerant, an ammonia refrigerant, or the like is used. In particular,
For example, R22 which is an HCFC refrigerant and R22 which is an HFC refrigerant
R410A, a single refrigerant such as 134a, HFC refrigerant
R407C which is a pseudo azeotropic mixed refrigerant such as HFC refrigerant
Non-azeotropic mixed refrigerants such as propane, isobutane, and ammonia, which are HC refrigerants, are used. In particular, as a refrigerant circulating in the refrigeration cycle, a refrigerant having a smaller temperature gradient than R22,
For example, R410A, R407C, R134a, R3
2. By using R290 or the like, the surface temperature gradient in the heat exchanger is reduced. Therefore, when detecting the evaporating temperature and the condensing temperature in the heat exchanger, the variation in the detected value of the temperature detecting means with respect to the position where the temperature detecting means is installed is reduced, so that the control can be performed with high accuracy and control becomes easy. Therefore, the operation can be controlled so as to quickly reach the target indoor air temperature and humidity, and an energy saving effect is also achieved. Similarly, by using a refrigerant having a smaller pressure loss than R22, for example, R410A, R32, R290, etc., as the refrigerant circulating in the refrigeration cycle, the indoor load detecting means and the accuracy of each detected value are improved, and the overall control The accuracy of is improved.

As a refrigerant circulating in the refrigeration cycle, a refrigerant having a higher pressure than R22, for example, R410A, R32
By using such a method, the pressure difference between the high-pressure side and the low-pressure side can be reduced in configuring the refrigeration cycle, and the load on the compressor and the decompression means can be reduced, so that reliability can be improved and an energy saving effect can be achieved.

Embodiment 3 In the first embodiment, the outside air introducing means 6 is formed integrally with the indoor unit 1, whereby outside air is introduced into the indoor unit 1, and the indoor air circulates and mixes with the return air taken into the indoor unit 1. Thus, the intake air to the indoor heat exchanger 3 was used.
In the present embodiment, the outside air introducing means 6 is not integrated with the indoor unit 1 but is separately disposed separately from the indoor unit 1 so as to take outside air into the room 2.

FIG. 18 is a partial configuration diagram showing a configuration near the indoor unit 1 of the air conditioner according to the present embodiment. The outside air introducing means 6 is attached to, for example, a wall surface in the room, and can take in fresh air outside the room into the room. The outside air introduction means 6 has, for example, a damper 17 as an outside air introduction opening / closing mechanism and a fan 16 for sucking outside air, and adjusts the opening / closing or opening degree of the damper 17 or changes the rotation speed of the fan 16. Thus, the amount of outside air introduced into the room can be controlled. Reference numeral 19 denotes a control signal line, which is connected to a microprocessor in the electronic box 15 installed in the indoor unit 1. For example, a control signal from the outside air amount control means 33 in the microprocessor is transmitted to the outside air introduction means 6 and the control signal is actually transmitted to the damper 17.
Of the fan 16 and the rotation speed of the fan 16 are controlled.

In the first embodiment, the mixed air of the outside air and the return air becomes the air sucked into the indoor heat exchanger 3 and exchanges heat with the refrigerant flowing through the indoor heat exchanger 3. Only the return air becomes the suction air and exchanges heat with the refrigerant, so that the air blown out from the indoor unit 1 and the outside air are mixed. Therefore, in the present embodiment, the starting point of the control vector when setting the air conditioning capacity is the return air temperature / humidity RA, and the refrigeration cycle SH is set so that the enthalpy difference of RA-SA * is minimized as much as possible.
The target outlet air temperature / humidity SA *, which is the end point of the control vector, is set in consideration of the allowable range of F. The basic concept of minimizing the enthalpy difference of the change in temperature and humidity while taking into account the allowable range of the SHF of the refrigeration cycle is the same as in the first embodiment. In the present embodiment, when setting the target outlet air temperature / humidity SA *, it is necessary to consider the target mixed air temperature / humidity. This mixed air is sucked into the indoor unit as return air after the indoor air-conditioning load is applied. Therefore, the target mixed air temperature and humidity are set to the target indoor temperature and humidity set by the user using a remote controller or the like and the indoor air-conditioning load. Can be set from

When the outside air introducing means 6 is provided independently of the indoor unit 1 as in the present embodiment, the outside air utilization range which saves energy is narrower than when it is provided integrally. Again, as compared with the conventional case where the outside air is not actively used, there is an energy saving effect and the effect on health by introducing fresh outside air is great.

In such a configuration, the configuration change from the indoor unit which is currently widely used is small. For example, the configuration may be changed so that the control signal is transmitted to the outside air introducing means 6 through the signal line 19. Can be easily achieved. Furthermore, since it is not integrated, cleaning and maintenance of only the portion of the outside air introducing means 6 can be easily performed.

Further, since the outside air introduction means 6 is independent of the indoor unit 1, the outside air introduction means 6 may have a function like a conventional ventilation fan. That is, if the configuration is such that the indoor air can be led out of the room by, for example, inverting the fan, air conditioning with a large ventilation function can be performed.

Embodiment 4 In the first embodiment, the heater 4 is configured to have a heater. However, the heater 4 may be any heater that can heat air, for example, about several degrees to 20 degrees Celsius, and is not limited to a heater. The heating means according to the present embodiment is generally called a reheating method, and heats air by heat exchange with a refrigerant. FIG. 19 is an overall configuration diagram illustrating an air conditioner according to the present embodiment, and FIG. 20 is a refrigerant circuit diagram illustrating an example of a refrigeration cycle according to the present embodiment. In the figure, 3a, 3
b denotes two indoor heat exchangers, and 25a and 25b denote expansion valves as pressure reducing means.

In the operation control according to the first embodiment,
For example, when the outside air temperature and humidity are in the zone or area during the cooling operation, and the extension line of the vector from the return air temperature and humidity RA to the target outlet air temperature and humidity SA * does not intersect with the saturation line, or the outside air temperature and humidity are in the zone. When the extension line of the vector from the outside temperature humidity OA3 to the target air temperature / humidity SA * does not intersect with the saturation line, it is impossible to achieve the target air temperature / humidity SA * in the refrigeration cycle. Was. At this time, the refrigeration cycle made the humidity coincide with the target and made the outlet side air low in temperature, and this air was heated to achieve the target outlet air temperature and humidity SA *. In this embodiment, two indoor heat exchangers 3a and 3b are provided, one indoor heat exchanger 3a is used as a condenser, and the other indoor heat exchanger 3a is used.
b is operated as an evaporator. The indoor heat exchanger 3b that operates as an evaporator is disposed, for example, on the upstream side of the air flow path, and the indoor heat exchanger 3a that operates as a condenser is disposed, for example, on the downstream side of the air flow path. These two indoor heat exchangers 3a, 3
b, an expansion valve 25b is provided.

The operation during the cooling operation of the refrigeration cycle shown in FIG. 20 will be described below. The high-pressure gas refrigerant compressed by the compressor 21 flows from the discharge port of the compressor 21 to the four-way valve 22.
, And radiates to the outside air blown by the outdoor fan 24. Then, the refrigerant is condensed and flows out of the outdoor heat exchanger 23 as a high-pressure liquid refrigerant. Thereafter, the pressure is reduced to the intermediate pressure by the expansion valve 25a, and the gas becomes a partial gas, flows through the refrigerant pipe, and flows into the indoor heat exchanger 3a of the indoor unit 1. The refrigerant is further condensed in the indoor heat exchanger 3a and heats the air flowing around the refrigerant pipe of the indoor heat exchanger 3a. Thereafter, the refrigerant flowing out of the indoor heat exchanger 3a is reduced in pressure to a low pressure by the expansion valve 25b, and becomes a low-pressure two-phase refrigerant. Further, the low-pressure two-phase refrigerant flows to the indoor heat exchanger 3b, where it cools and dehumidifies the indoor air by exchanging heat with the air flowing around when collecting heat and evaporating. Then, the refrigerant flows out from the indoor heat exchanger 3b as low-pressure gas refrigerant, flows through the refrigerant pipe 7 to the outdoor unit 8, and returns to the suction port of the compressor 21 via the four-way valve 22. By such an operation, the indoor heat exchanger 3a serves as a heating unit, and the indoor heat exchanger 3b obtains cold heat.

By using such a reheating type heating means, even if a flammable refrigerant such as R290 is used as the refrigerant of the air conditioner, the refrigerant does not burn and a safe air conditioner is obtained. be able to. In recent years, from the viewpoint of global environmental protection, there has been an increasing demand for using a refrigerant that does not destroy the ozone layer and has a global warming potential of 0. R290 satisfies this condition, but the problem is that its properties are flammable. With the configuration as in the present embodiment, fresh air can be actively and effectively used, energy saving, good health, and air conditioning that can be safely used even with a flammable refrigerant. A device is obtained.

FIG. 21 is an explanatory view showing an example of the arrangement of the heat exchangers in the indoor unit, and is a view of a longitudinal section of the horizontally long indoor unit 1. As shown in FIG. This indoor unit is configured to suck air from the upper side and the front side and blow air from the lower side. The indoor heat exchanger 3a operating as a condenser and the indoor heat exchanger 3b operating as an evaporator are each divided into two, and are arranged around the indoor fan 5. With such a configuration, the overall size of the indoor unit 1 can be made compact, and one indoor fan 5 allows the intake air to flow around the two heat exchangers, and further blows air from the indoor unit 1 into the indoor unit. Can be blown out.

In each of the air conditioners of the first to fourth embodiments, a compatible oil having high mutual solubility with the circulating refrigerant is used as a lubricating oil for the compressor when a refrigeration cycle is used. When the lubricating oil is used, even if the lubricating oil flows out of the compressor, the lubricating oil mixes with the refrigerant and returns to the compressor again, so that failure of the compressor can be prevented and reliability of the compressor can be improved. As a compatible oil, for example, for an HCFC refrigerant,
Lubricating oils such as naphthenic, paraffinic and alkylbenzene are used. For example, for HFC refrigerants, lubricating oils such as polyalkyl glycols having a hydrophilic group, ethers, and fluorinated oils are used.

Further, when a weakly compatible oil which is only slightly soluble in the circulating refrigerant is used as the lubricating oil for the compressor, sludge hardly adheres to the inside of the refrigerant pipe constituting the refrigeration cycle, and the inside and outside of the refrigerant pipe are hardly formed. An increase in the temperature difference can be prevented. Therefore, the reliability of the control based on the temperature is improved, and the accuracy of the overall control can be improved.
As a weakly compatible oil, for example, mineral oil,
Lubricating oils such as alkyl benzene oils and HAB oils are used.

In the above description, the control method when the cooling operation is performed has been described. However, by performing the control in relation to the temperature and the humidity in the heating operation, the outside air is introduced according to the outdoor air condition. Air-conditioning can be performed to obtain a comfortable indoor space by effectively using the air conditioner, keeping the indoor air fresh, and aiming to save energy by bringing the room to the target indoor air state in a short time. Can be.

[0102]

As described above, according to the first aspect of the present invention, the air conditioner cools or heats the indoor air to change the temperature or humidity of the indoor air in relation to the target air temperature. Performing air conditioning in the room so as to approach a certain temperature and humidity, and introducing the outside air into the room with outside air introduction means capable of adjusting the introduction amount of outside air, and the temperature and humidity of the outside air, By changing the introduction amount of the outside air based on the temperature and the humidity of the room air and the target values of the temperature and the humidity of the room air, the outside air is introduced according to the outdoor air condition, thereby effectively introducing the outside air. An air conditioning method that can perform air conditioning so as to obtain a comfortable indoor space by using the air conditioning is obtained.

According to the second aspect of the present invention, when the enthalpy of the outside air is larger than the enthalpy of the room air, the outside air introduction means is closed to minimize the amount of outside air introduced, so that the outdoor air condition is minimized. Air can be introduced so as to obtain a comfortable indoor space by effectively utilizing the outside air, and an air conditioning method that can achieve energy savings without performing unnecessary work can be obtained. .

According to the third aspect of the invention, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and the humidity of the outside air are target values from the temperature and the humidity of the room air. When the temperature and humidity of the mixed air obtained by mixing the outside air and the room air are closer to the target temperature and humidity when the temperature is lower than the extension line of the change to the amount of change in temperature. By adjusting the amount of outside air introduced so that the amount of change in humidity becomes large, air is introduced according to the outside air condition and used effectively to perform air conditioning so as to obtain a comfortable indoor space. Thus, an air-conditioning method capable of realizing energy saving without wasteful work can be obtained.

According to the fourth aspect of the present invention, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and the humidity of the outside air are target values from the temperature and the humidity of the room air. When the temperature and humidity of the mixed air obtained by mixing the outside air and the room air are closer to the target temperature and humidity when the humidity is lower than the extension line of the change to the amount of change in temperature. By adjusting the amount of outside air introduced so that the amount of change in humidity is small, outside air is introduced according to the outdoor air condition, and this is used effectively to perform air conditioning so as to obtain a comfortable indoor space. Thus, an air-conditioning method capable of realizing energy saving without wasteful work can be obtained.

According to the fifth aspect of the present invention, the room in which at least one of the temperature and the humidity of the suction air is changed by exchanging heat between the hot or cold heat transported by the heat transport means and the suction air. A heat exchanger, an indoor fan that blows air after heat exchange by the indoor heat exchanger into a room as blown air, an outside air introduction unit that introduces outside air from outside, and an outside air temperature detection unit that detects a temperature of the outside air. Outside air humidity detecting means for detecting the humidity of the outside air, indoor temperature detecting means for detecting the temperature of the indoor air, indoor humidity detecting means for detecting the humidity of the indoor air, and detecting the air conditioning load in the room Indoor air-conditioning load detecting means, an outside air state obtained from the temperature and humidity of the outside air, an indoor air state obtained from the temperature and humidity of the indoor air, obtained by the indoor air-conditioning load detecting means. Indoor air conditioning load, target indoor air temperature and the target room air state obtained from the target indoor air humidity, the outside air state of the room air condition, the indoor air conditioning load,
An operation setting means for setting an outside air introduction amount for taking in the outside air into the room based on the target indoor air condition and a change amount of temperature and humidity between the suction air and the blown air in the indoor heat exchanger. Outside air amount control means for controlling the operation of the outside air introduction means so as to have the outside air introduction amount set by the operation operation setting means, and between the suction air set by the operation operation setting means and the blown air. With the provision of the operation control means for controlling the operation of the heat transport means so as to obtain the amount of change in temperature and humidity, it is possible to introduce external air in accordance with the outdoor air condition and effectively utilize the external air for comfortable use. An air conditioner capable of performing air conditioning so as to obtain a suitable indoor space is obtained.

According to the invention, the outside air enthalpy obtained from the outside air temperature detected by the outside air temperature detection unit and the outside air humidity detected by the outside air humidity detection unit is determined by the driving operation setting unit. By setting so that outside air is introduced when the indoor air temperature detected by the detection means and the indoor air humidity detected by the indoor air humidity detection means are smaller than the indoor air enthalpy, An air conditioner that can perform air conditioning so as to obtain a comfortable indoor space by introducing and effectively using outside air, and that can achieve energy saving without performing unnecessary work can be obtained.

According to the seventh aspect of the present invention, in the operation setting means, in the psychrometric chart, the outside air temperature and humidity are lower than the line connecting the indoor air temperature and the target indoor air temperature and humidity. At the time, the outside air is introduced to reduce the temperature of the indoor air mainly, and the heat exchange with the refrigerant in the indoor heat exchanger is set so as to mainly reduce the humidity of the indoor air, so that the outdoor An air conditioner that introduces outside air according to the air condition and can effectively use it to perform air conditioning so as to obtain a comfortable indoor space, and can also save energy without performing unnecessary work. can get.

According to the eighth aspect of the present invention, in the operation setting means, the temperature / humidity of the outside air in the humid air chart is lower than the line connecting the indoor air temperature / humidity and the target indoor temperature / humidity. When the outside air is introduced to reduce the humidity of the indoor air mainly, and the temperature of the room air is mainly reduced by heat exchange with the refrigerant in the indoor heat exchanger, the outdoor air An air conditioner that can introduce air outside according to the condition and effectively use the air to perform air conditioning so as to obtain a comfortable indoor space and achieve energy saving without performing unnecessary work is obtained. Can be

According to the ninth aspect of the present invention, a heating means provided in the air flow path downstream of the indoor heat exchanger for heating the air flowing out of the indoor heat exchanger is provided. Air conditioning that introduces outside air in accordance with the outdoor air condition and uses it effectively to perform air conditioning so as to obtain a comfortable indoor space, and also achieves energy savings without performing unnecessary work. A device is obtained.

According to the tenth aspect of the present invention, the heating means heats the air by heat exchange with a heater or a refrigerant, thereby introducing outside air in accordance with the outdoor air condition. , Air conditioning can be performed so as to obtain a comfortable indoor space, and an air conditioner that can realize energy saving without performing useless work can be obtained.

According to the eleventh aspect of the present invention, the outside air introduction means has at least an outside air introduction port opening / closing mechanism, and the outside air introduction port opening / closing mechanism is opened / closed, or the outside air introduction port opening / closing mechanism is provided. By adjusting the opening, the amount of outside air introduced was made variable, so it was possible to introduce outside air according to the outdoor air condition and use it effectively to perform air conditioning so as to obtain a comfortable indoor space. It is possible to obtain an air conditioner capable of performing more detailed control and realizing energy saving.

According to the twelfth aspect of the present invention, the refrigeration cycle in which the heat transport means is connected to the compressor, the heat source side heat exchanger, the pressure reducing means, and the use side heat exchanger by a refrigerant pipe to circulate the refrigerant. By comprising an indoor heat exchanger with the use side heat exchanger and transporting cold or hot heat to the indoor heat exchanger by the refrigerant flowing through the refrigerant pipe, or By having a circulation path for transporting the cold or hot heat in the use-side heat exchanger to the another heat exchanger by forming a separate heat exchanger from the use-side heat exchanger, An air conditioner capable of introducing an outside air in accordance with an outdoor air condition using an energy-efficient refrigeration cycle and effectively utilizing the outside air to perform air conditioning so as to obtain a comfortable indoor space is obtained. Can be

According to the thirteenth aspect, the refrigerant of the refrigeration cycle is a refrigerant having a smaller temperature gradient than R22, a refrigerant having a higher pressure than R22, or a refrigerant having a smaller pressure loss than R22. An air conditioner that can improve the accuracy and achieve energy saving can be obtained.

According to the fourteenth aspect, the refrigerant of the refrigeration cycle is a flammable refrigerant.
An air conditioner that can preserve the global environment can be obtained.

According to the fifteenth aspect of the present invention, an air conditioner capable of preserving the global environment can be obtained by using water or antifreeze as a refrigerant in a refrigeration cycle or a circulation path.

According to the sixteenth aspect of the present invention, the lubricating oil to be filled in the refrigeration cycle is compatible with the circulating refrigerant or only slightly soluble in the circulating refrigerant. By using a weakly compatible oil,
An air conditioner that can improve reliability can be obtained.

According to the seventeenth aspect of the present invention, on the psychrometric chart, air having a temperature and humidity varying between the temperature and humidity of the outside air and the temperature and humidity of the room air in accordance with the amount of outside air introduced is sucked. Air, air having the temperature and humidity set as the target blow-off air is blow-off air, and the change in temperature and humidity from the suction air to the blow-off air is a control vector, and the extension of the control vector is limited from the allowable range of the refrigerant temperature. By setting the temperature and humidity of the suction air and the refrigerant temperature within the allowable range to reach the temperature and humidity of the saturation line in the range
According to the outdoor air condition, the outside air can be introduced and used effectively, and when controlling the air conditioner when the outside air is actively used, the air temperature and air humidity are related to the air temperature to create a comfortable indoor space. Thus, a control method of an air conditioner that can perform air conditioning as described above is obtained.

According to the eighteenth aspect of the present invention, the control vector is extended so as to reach the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature, and the input of the air conditioner is minimized. By setting the temperature and humidity of the suction air and the refrigerant temperature within the allowable range, the outside air can be introduced and used effectively according to the outdoor air condition, and air that can further save energy can be realized. A method for controlling the harmony device is obtained.

According to the nineteenth aspect, the outdoor air is introduced by controlling the temperature and humidity of the intake air so that the enthalpy of the intake air is equal to or less than the enthalpy of the indoor air. An air conditioner that can introduce external air in accordance with the air condition of the air conditioner and effectively use it to perform air conditioning so as to obtain a comfortable indoor space, and can also save energy without wasting work. Is obtained.

According to the twentieth aspect of the present invention, when the temperature and humidity of the outside air are lower than the extension line of the change of the temperature and humidity from the room air to the target blowing air, the temperature of the suction air is reduced. By controlling the introduction amount of the outside air so as to approach the temperature of the target blown air or to increase the inclination of the control vector, the outside air is introduced according to the outdoor air condition to effectively use the outside air. Thus, it is possible to obtain a control method of an air conditioner that can perform air conditioning so as to obtain a comfortable indoor space and can save energy without performing useless work.

According to the twenty-first aspect of the present invention, when the temperature and humidity of the outside air are lower than the extension line of the change of the temperature and humidity from the room air to the target blowout air, the humidity of the suction air becomes lower. By controlling the introduction amount of the outside air so as to approach the humidity of the target blown air or to decrease the inclination of the control vector, the outside air is introduced according to the outdoor air condition, and this is effectively used. Thus, it is possible to obtain a control method of an air conditioner that can perform air conditioning so as to obtain a comfortable indoor space and can save energy without performing useless work.

According to the twenty-second aspect of the present invention, on the psychrometric chart, air having a temperature and humidity varying between the temperature and humidity of the outside air and the temperature and humidity of the room air according to the amount of the outside air introduced is sucked. Saturation in a range in which the extension of the change in temperature and humidity from the suction air to the blown air is limited from the allowable range of the refrigerant temperature when the air and the air having the temperature and humidity set as the target blowout air are the blowout air. When the temperature deviates from the temperature and humidity of the line, when the air having the same level of humidity as the target value of the humidity of the blown air is used as the blown air, a change in temperature and humidity from the suction air to the blown air is used as a control vector, The temperature and humidity of the suction air and the refrigerant temperature within the allowable range are set so that the extension of the control vector reaches the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature, and the temperature of the blown air is set. By setting the heating amount so that the temperature is lower than the temperature of the target blow-off air so as to reach the temperature of the target blow-out air, outside air can be introduced according to the outdoor air condition, and this can be used effectively. In addition, when controlling the air conditioner when the outside air is actively used, a control method of the air conditioner that can perform air conditioning so as to obtain a comfortable indoor space by relating the air humidity together with the air temperature is obtained. Can be

According to the twenty-third aspect of the present invention, the control vector is extended so as to reach the temperature and humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature and the input of the air conditioner is minimized. By setting the temperature and humidity of the suction air and the refrigerant temperature within the allowable range, the outside air can be introduced and used effectively according to the outdoor air condition, thereby realizing further energy saving. A method for controlling the harmony device is obtained.

According to the invention of claim 24, the temperature and humidity of the intake air are changed between the temperature and humidity of the outside air and the temperature and humidity of the room air, or the humidity is the same as the humidity of the target blown air. By changing the temperature of the blown air and setting the control vector so that the total energy of the air conditioning capacity and the heating amount, which is the length of the control vector, is reduced, the outside air is introduced according to the outdoor air condition and A method of controlling an air conditioner that can be used effectively and that can save energy without performing useless work can be obtained.

According to the twenty-fifth aspect of the present invention, there are a region where the enthalpy of the outside air is larger than the enthalpy of the room air, and a region where the enthalpy of the outside air is smaller than the enthalpy of the room air. By setting the amount of outside air introduced according to the area, outside air can be introduced and used effectively according to the outdoor air condition, and when controlling the air conditioner when actively using outside air, The air conditioning can be performed so as to obtain a comfortable indoor space by relating the air humidity together with the air temperature, and a control method of the air conditioner that is easy to control can be obtained.

According to the twenty-sixth aspect of the present invention, the area where the temperature and humidity of the outside air is lower than the extension line of the change of the temperature and humidity from the room air to the target blowing air, and the temperature and humidity of the outside air The region is on the lower humidity side than the extended line of the change of temperature and humidity from the room air to the target blowout air, and the region according to the region, by setting the air conditioning capacity of the refrigeration cycle, according to the outdoor air condition A method for controlling an air conditioner that can introduce air and use it effectively to perform air conditioning so as to obtain a comfortable indoor space and achieve energy savings without wasteful work. Can be

According to the twenty-seventh aspect of the present invention, the region of the outside air where the enthalpy of the outside air is larger than the enthalpy of the room air, the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature of the outside air The area where the humidity is lower than the extension of the change in temperature and humidity from the room air to the target blowing air, and the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are from the room air. By setting the amount of outside air introduced, the air-conditioning capacity of the refrigeration cycle, and the refrigerant temperature in accordance with the three regions, that is, the region on the lower humidity side than the extension of the change in temperature and humidity to the target blown air, According to the air condition of the outside air can be introduced and used effectively to perform air conditioning to obtain a comfortable indoor space,
Further, it is possible to obtain a method of controlling an air conditioner that can save energy without performing useless work.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a refrigerant circuit diagram illustrating a refrigeration cycle according to the first embodiment.

FIG. 3 is an explanatory diagram showing a general psychrometric chart.

FIG. 4 is an explanatory diagram showing a flow of air in a room according to the first embodiment.

FIG. 5 is a block diagram showing a flow of control according to the first embodiment.

FIG. 6 is an explanatory diagram showing a change in an air state in a psychrometric chart according to the first embodiment.

FIG. 7 is an explanatory diagram relating to the first embodiment and illustrating zoning of an outside air utilization method based on an outside air state on a psychrometric chart.

FIG. 8 is a flowchart showing a procedure of zoning processing of an outside air utilization method based on an outside air state according to the first embodiment.

FIG. 9 is a flowchart illustrating a processing procedure when the outside air state is a zone according to the first embodiment.

FIG. 10 is a flowchart illustrating a processing procedure when the outside air state is a zone according to the first embodiment.

FIG. 11 is an explanatory diagram illustrating a control vector on a psychrometric chart when the outside air state is a zone according to the first embodiment.

FIG. 12 is an explanatory diagram illustrating a control vector on a psychrometric chart in a case where the outside air state is a zone and a heater is used according to the first embodiment.

FIG. 13 is a flowchart illustrating a processing procedure when the outside air state is a zone according to the first embodiment.

FIG. 14 is an explanatory diagram illustrating a control vector on a psychrometric chart when the outside air state is a zone according to the first embodiment.

FIG. 15 is an explanatory diagram illustrating a control vector on a psychrometric chart when the outside air state is a zone according to the first embodiment.

FIG. 16 is an explanatory diagram illustrating control vectors on a psychrometric chart when a heater is used when the outside air state is a zone according to the first embodiment.

FIG. 17 is a refrigerant circuit diagram illustrating a configuration of a heat transport unit according to the air-conditioning apparatus according to Embodiment 2 of the present invention.

FIG. 18 is an explanatory diagram showing a configuration near an indoor unit according to an air conditioner according to Embodiment 3 of the present invention.

FIG. 19 is an overall configuration diagram showing an air conditioner according to Embodiment 4 of the present invention.

FIG. 20 is a refrigerant circuit diagram showing a refrigeration cycle according to a fourth embodiment.

FIG. 21 is an explanatory diagram showing an arrangement of an indoor heat exchanger in an indoor unit according to Embodiment 4.

FIG. 22 is a configuration diagram showing a conventional air conditioner.

[Explanation of symbols]

1 indoor unit, 2 rooms, 3a, 3b indoor heat exchanger, 4 heating means, 5 indoor fan, 6 outdoor air introduction means, 7 refrigerant pipe, 8 outdoor unit, 9 indoor air temperature detection means, 10 indoor air humidity detection Means, 11 outside air temperature detecting means, 12 outside air humidity detecting means, 13 outlet air temperature detecting means, 14 outlet air humidity detecting means, 1
6 Fan of outside air introduction means, 17 Damper of outside air introduction means, 18 Indoor heat exchanger piping temperature detection means, 21 Compressor, 22 Flow path switching means, 23 Outdoor heat exchanger, 24 Outdoor fan, 25, 25a, 25b Decompression Means, 26 heat exchanger, 27 fluid conveying means, 31 indoor air conditioning load detecting means, 32 operation setting means, 33 outside air amount control means, 34 operation operation control means.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takuya Kanba 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (Reference) 3L060 AA06 AA07 CC02 CC07 DD02 DD05 EE23 EE24 EE27 EE31

Claims (27)

[Claims] 1. An air conditioner cools or heats room air to change the temperature or humidity of the room air in relation to the room air, and performs air conditioning in the room so as to approach target values of temperature and humidity. And a step of introducing the outside air into the room with outside air introduction means capable of adjusting the amount of outside air introduced, wherein the temperature and humidity of the outside air, the temperature and humidity of the room air, and the target value of the room air An air conditioning method, wherein the amount of outside air introduced is changed based on the temperature and humidity. 2. The air conditioning method according to claim 1, wherein when the enthalpy of the outside air is larger than the enthalpy of the room air, the outside air introduction means is closed to minimize the amount of outside air introduced. 3. The enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are lower than the extension of the change from the temperature and humidity of the room air to the target values of temperature and humidity. When approaching the target temperature and humidity from the temperature and humidity of the mixed air obtained by mixing the outside air and the room air, the outside air is increased so that the amount of change in humidity with respect to the amount of change in temperature becomes large. 2. The air conditioning method according to claim 1, wherein the amount of air introduced is adjusted. 4. The enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are lower than the extension of the change from the temperature and humidity of the room air to the target values of temperature and humidity. When the temperature and humidity of the mixed air obtained by mixing the outside air and the room air approach the target values of temperature and humidity, the outside air is reduced so that the amount of change in humidity with respect to the amount of change in temperature becomes small. 2. The air conditioning method according to claim 1, wherein the amount of air introduced is adjusted. 5. An indoor heat exchanger for exchanging heat or cold with the suction air transported by the heat transport means and changing at least one of the temperature and humidity of the suction air, and the indoor heat exchanger. An indoor fan that blows the air after the heat exchange by the air into the room as blown air, an outside air introduction unit that introduces outside air from outside, an outside air temperature detection unit that detects a temperature of the outside air, and an outside air that detects a humidity of the outside air. Humidity detecting means, indoor temperature detecting means for detecting the temperature of the indoor air, indoor humidity detecting means for detecting the humidity of the indoor air, indoor air conditioning load detecting means for detecting the indoor air conditioning load, The outside air state obtained from the temperature and the humidity, the indoor air state obtained from the temperature and the humidity of the indoor air, the indoor air-conditioning load obtained by the indoor air-conditioning load detecting means, the target indoor air temperature and The target indoor air condition and the target indoor air condition obtained from the outside air condition, the room air condition, the indoor air conditioning load, the outside air introduction amount for taking in the outside air into the room based on the target room air condition, and the indoor heat Operating operation setting means for setting the amount of change in temperature and humidity between the suction air and the blowing air in the exchanger; and the external air introducing means so as to achieve the external air introduction amount set by the operation operation setting means. And an operation for controlling the operation of the heat transport means so as to obtain a change in temperature and humidity between the suction air and the blown air set by the operation operation setting means. An air conditioner comprising operation control means. 6. The operation setting means includes means for setting an outside air enthalpy obtained from the outside air temperature detected by the outside air temperature detection means and the outside air humidity detected by the outside air humidity detection means to the indoor air temperature detected by the indoor air temperature detection means and the indoor air temperature. The air conditioner according to claim 5, wherein when the indoor air enthalpy obtained from the indoor air humidity detected by the air humidity detecting means is smaller than the indoor air enthalpy, the outside air is introduced. 7. When the temperature and humidity of the outside air are lower than a line connecting the room air temperature and the target room air temperature and humidity in the psychrometric chart, the operation setting means introduces the outside air and introduces the main air. 7. The air conditioner according to claim 6, wherein the temperature of the indoor air is lowered so as to mainly reduce the humidity of the indoor air by heat exchange with the refrigerant in the indoor heat exchanger. 8. When the temperature and humidity of the outside air are lower than the line connecting the indoor air temperature and the target room temperature and humidity in the humid air chart, the operation setting means mainly introduces the outside air and The air conditioner according to claim 6, wherein the humidity of the indoor air is reduced, and the temperature of the indoor air is mainly reduced by heat exchange with the refrigerant in the indoor heat exchanger. 9. The air conditioner according to claim 5, further comprising a heating means provided in an air flow path downstream of the indoor heat exchanger for heating the air flowing out of the indoor heat exchanger. The air conditioner according to any one of the preceding claims. 10. The air conditioner according to claim 9, wherein the heating means heats the air by heat exchange with a heater or a refrigerant. 11. The outside air introduction means has at least an outside air introduction port opening / closing mechanism, and opens and closes the outside air introduction port opening / closing mechanism, or adjusts an opening degree of the outside air introduction port opening / closing mechanism, thereby introducing outside air introduction means. 11. The method according to claim 5, wherein the amount is variable.
The air conditioner according to item. 12. The heat transport means includes a refrigeration cycle in which a compressor, a heat source side heat exchanger, a pressure reducing means, and a use side heat exchanger are connected by a refrigerant pipe to circulate a refrigerant, and the indoor heat exchanger uses the heat exchanger. A heat exchanger configured to transfer cold or warm heat to the indoor heat exchanger by the refrigerant flowing through the refrigerant pipe by forming the indoor heat exchanger, or by using a different heat exchanger from the use-side heat exchanger. 6. A circulation path for transporting cold or hot heat from said use side heat exchanger to said another heat exchanger.
An air conditioner according to any one of claims 11 to 11. 13. The air conditioner according to claim 12, wherein the refrigerant in the refrigeration cycle is a refrigerant having a smaller temperature gradient than R22, a high-pressure refrigerant than R22, or a refrigerant having less pressure loss than R22. 14. The air conditioner according to claim 12, wherein the refrigerant of the refrigeration cycle is a flammable refrigerant. 15. The refrigerant in a refrigeration cycle or a circulation path,
The air conditioner according to any one of claims 12 to 14, wherein the air conditioner is water or antifreeze. 16. The lubricating oil filled in the refrigeration cycle is a compatible oil having mutual solubility in the circulating refrigerant or a weakly compatible oil which is only slightly soluble in the circulating refrigerant. The air conditioner according to any one of claims 12 to 15, wherein: 17. On a psychrometric chart, air having a temperature and humidity that changes between the temperature and humidity of the outside air and the temperature and humidity of the room air in accordance with the amount of the introduced outside air is set as the suction air and set as the target blowing air. The air of temperature and humidity is blown air, the change of temperature and humidity from the suction air to the blown air is a control vector, and the extension of the control vector is set to the temperature and humidity of the saturation line in the range limited from the allowable range of the refrigerant temperature. A method for controlling an air conditioner, wherein the temperature and humidity of the suction air and the temperature of the refrigerant within the allowable range are set so as to reach. 18. The temperature and humidity of the suction air so that the extension of the control vector reaches the temperature and humidity of the saturation line within a range limited from the allowable range of the refrigerant temperature, and the input of the air conditioner is minimized. The control method for an air conditioner according to claim 17, wherein a refrigerant temperature within the allowable range is set. 19. The introduction amount of outside air is controlled by setting the temperature and humidity of the intake air so that the enthalpy of the intake air is equal to or less than the enthalpy of the indoor air. A method for controlling an air conditioner. 20. When the temperature and humidity of the outside air are lower than the extension line of the change of the temperature and humidity from the indoor air to the target blow-off air, the temperature of the intake air approaches the temperature of the target blow-off air. 20. The control method for an air conditioner according to claim 19, wherein the amount of outside air introduced is controlled so that the inclination of the control vector becomes large. 21. When the temperature and humidity of the outside air are lower than the extension line of the change of the temperature and humidity from the room air to the target air, the humidity of the suction air approaches the humidity of the target air. 20. The control method for an air conditioner according to claim 19, wherein the amount of the outside air introduced is controlled so that the inclination of the control vector becomes small. 22. On the psychrometric chart, air having a temperature and humidity that varies between the temperature and humidity of the outside air and the temperature and humidity of the room air in accordance with the amount of outside air introduced is set as the suction air and set as the target blowing air. When the temperature / humidity air is blown air, if the extension of the temperature / humidity change from the suction air to the blown air deviates from the temperature / humidity of the saturation line within the range limited from the allowable range of the refrigerant temperature, the blown air When air having the same level of humidity as the target value of humidity is used as the blow-off air, a change in temperature and humidity from the suction air to the blow-off air is used as a control vector, and the extension of the control vector is an allowable range of the refrigerant temperature. The temperature and humidity of the suction air and the refrigerant temperature within the allowable range are set so as to reach the temperature and humidity of the saturation line within the range limited, and the temperature of the blown air is lower than the temperature of the target blown air. Wherein the heating amount is set so that the temperature of the target blown air is reached when the heating is performed. 23. The temperature and humidity of the intake air are adjusted so that the extension of the control vector reaches the temperature and humidity of the saturation line within a range limited from the allowable range of the refrigerant temperature, and the input of the air conditioner is minimized. 23. The control method for an air conditioner according to claim 22, wherein a refrigerant temperature within the allowable range is set. 24. The control vector, wherein the temperature of the intake air is changed between the temperature and humidity of the outside air and the temperature and humidity of the room air, or the temperature of the blown air is changed at the same level as the humidity of the target blown air. 24. The control method for an air conditioner according to claim 22, wherein the control vector is set so that the total amount of energy between the air conditioning capacity and the heating amount, which is the length of the air conditioner, is reduced. 25. An introduction amount of outside air is set according to a region of outside air in which the enthalpy of outside air is larger than the enthalpy of room air, and a region of outside air in which the enthalpy of outside air is smaller than the enthalpy of room air. A method for controlling an air conditioner. 26. A region in which the temperature and humidity of the outside air is lower than an extension line of the change of the temperature and humidity from the room air to the target blowout air, and the temperature and humidity of the outside air change from the room air to the target blowout air. A method for controlling an air conditioner, characterized in that the air conditioning capacity of a refrigeration cycle is set in accordance with an area on the lower humidity side than an extension line of the change in temperature and humidity. 27. A region of the outside air in which the enthalpy of the outside air is larger than the enthalpy of the room air, and the enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are from the room air to the target blowing air. Area that is lower than the extension of the temperature and humidity changes
The enthalpy of the outside air is smaller than the enthalpy of the room air, and the temperature and humidity of the outside air are lower than the extension line of the change of the temperature and humidity from the room air to the target blowing air. A method for controlling an air conditioner, comprising setting an amount of outside air introduced, an air conditioning capacity of a refrigeration cycle, and a refrigerant temperature in accordance therewith.