JPH09250797A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner which embodies a comfortable indoor environment during cooling and heating time irrespective of the amount of air conditioning load and prevents the generation of dew condensation on a wall surface of a dwelling house or the like. SOLUTION: This air conditioner is provided with a compressor, an indoor heat exchanger, an outdoor heat exchanger, a changeover value for cooling and heating service and a control data housing means which decides the operation frequency of the aforesaid compressor into a plurality of allocation steps and houses a specified operation frequency for each step in structure. In this case, the aforesaid data housing means is provided with at least a first table (A) designed for a dwelling space whose air conditioning load is large and a second table (B) designed for a dwelling space whose air conditioning load is mall where a compressor operation control device selects either the first table (A) or the second table (B) described above, responding to the amount of the air conditioning load.

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 more particularly to an air conditioner that performs comfortable control according to an air conditioning load.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram of an example of an air conditioner using a conventional heat pump type refrigeration cycle.

In FIG. 8, 101 is a compressor for compressing a refrigerant in a gas state, 102 is an inverter controller for varying the operating frequency of the compressor 101, 103 is a four-way valve for switching the flow direction of the refrigerant, and 104 is installed indoors. Indoor heat exchanger that exchanges heat between the inside air and the refrigerant, 1
Reference numeral 05 is an indoor blower that sends air from the indoor heat exchanger to the room, 106 is an expansion valve that adjusts the opening of the valve to increase and decrease the flow rate of the refrigerant, and depressurizes. 107 is installed outside the room to connect the outside air and the refrigerant. An outdoor heat exchanger for exchanging heat between the two, and an outdoor fan 108 for cooling the outdoor heat exchanger 107.

Further, 110 is an indoor temperature sensor, 111 is an indoor humidity sensor, 112 is an actuator for driving the four-way valve, 113 is an indoor heat exchanger sensor for measuring the temperature of the indoor heat exchanger 104, and 114 is a motor rotation. An actuator that controls the number to control the air volume, 115 is an actuator that drives the expansion valve, and 116 is an outdoor temperature sensor. Further, 120 is an operation control processing device for controlling the inverter control device 102 and the like based on the detection data of the indoor temperature sensor 110, the indoor humidity sensor 111 and the like.
Reference numeral 1 denotes a ROM (control data storage means) storing a table of operating frequencies of the compressor 101 (see FIG. 9).
It is. The indoor temperature sensor 110 and the indoor humidity sensor 111 are arranged near the operation control processing device 120.

With such a structure, the air conditioner can be used as a cooling machine or a heating machine by switching the four-way valve 103 or the like.

By the way, in the conventional houses, the heat insulation performance is not good and the air-conditioning load is large, but in recent years, the heat insulation performance is good and the air-conditioning load is small in many houses.

When the outside air temperature is about 10 ° C. and the air conditioner is heated in a conventional house with poor heat insulation performance, the operation control processor 120 outputs a detection signal from the indoor temperature sensor 110. Based on this, an appropriate value is selected from the stepwise assigned numerical values of the operating frequency of the compressor 101 shown in FIG. 9 to operate the compressor 101.

As a result, as shown in FIG. 10 (A), the room can be comfortably air-conditioned such that the room temperature is shown by the solid line and the ventilation temperature is shown by the dotted line. That is, since the indoor temperature is low immediately after the start of operation (about 10 ° C.), the frequency of the compressor is increased to relatively rapidly increase the temperature to the target temperature (for example, 20 ° C.), and once the target temperature is reached. Is a low frequency (for example, 15Hz and 20H shown in FIG. 9).
The target temperature of 20 ° C. is maintained in z).

Further, when the outside air temperature is about 30 ° C. (when it is not so high), when the air conditioner is cooled in a conventional house with poor heat insulation performance, as shown in FIG. 11 (A). , Near the lowest frequency (eg 15Hz and 2
The compressor 101 continuously operates at 0 Hz) to maintain the indoor temperature and humidity in a comfortable state.

[0010]

However, when the air conditioner shown in FIG. 8 is applied to a house having a good heat insulation performance and a small air conditioning load to perform heating operation, as shown in FIG. 10 (B), After the target temperature (20 ° C.) is suddenly reached, the compressor operation is intermittent (on / off), and as a result, the temperature of air blown from the indoor blower 105 (shown by the dotted line) changes intermittently, which is unnoticeable to the user. There was a risk of giving a pleasant feeling.

Further, the outside temperature of the air conditioner is 30 ° C.
When the air-conditioning operation is performed in a house with a good heat insulation performance and a small air-conditioning load, the compressor 101 is intermittently operated (on / off) and the indoor heat exchanger 104 is operated as shown in FIG. 11 (B). Due to the re-evaporation of water from the surface, the indoor humidity greatly increases when the compressor 101 is off (reference C), and the dehumidification amount also decreases because the operating time of the compressor 101 is short (reference B), resulting in the indoor humidity. Becomes higher (reference A).

Therefore, in a highly insulated house, the temperature difference between the inside and the outside may become large, and when the indoor humidity becomes high, dew condensation may occur on the inner wall or inside the wall body, which may cause mold and mites, which is not preferable.

Therefore, an object of the present invention is to provide an air conditioner which realizes a comfortable indoor environment at the time of cooling and heating regardless of the air conditioning load and does not cause dew condensation on a wall of a house or the like.

[0014]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a compressor, an indoor heat exchanger, an outdoor heat exchanger, a cooling / heating switching valve, and the compressor. In an air conditioner provided with a control data storage unit that stores operating frequencies in a plurality of allocation stages and stores a predetermined operating frequency for each stage, the data storage unit is at least for a living space with a large air-conditioning load. A compressor operation control device that includes one table and a second table for a living space with a small air conditioning load, and selects either the first table or the second table according to the magnitude of the air conditioning load to operate the compressor. It is characterized by having.

The operating frequency assigned to the second table is set to be lower than the operating frequency assigned to the first table, and the operating frequency is set lower than the operating frequency assigned to the first table. The allocation step of is increased and stored in the low frequency region.

According to the first and second aspects of the present invention, in the compressor operation control device, when the air-conditioning load is small, the minimum frequency of allocation storage is small, and the operation frequency allocation step increases the low frequency range. The stored second table (for example, FIG. 1B) is selected to operate the compressor. Then, as shown in FIG. 3, once the target temperature (for example, 20 ° C.) is reached, the frequency becomes 1
If it falls from 5Hz, it falls to 10Hz (15H
It does not fall from z to 0 Hz) and the compressor does not turn on and off (intermittently), so a comfortable living space can be secured.

When the air-conditioning load is large, the lowest frequency of allocation storage is larger than that of the first table, and the first frequency table in which the operating frequency allocation stage is roughly stored in the low frequency region (for example, FIG. 1A). Select to operate the compressor. Then, as shown in FIG. 10A, once the target temperature (for example, 20 ° C.) is reached, the frequency is 20H.
It is operated at z (the air conditioning load is large and it is necessary to operate the compressor at a high frequency), and even if the frequency drops from 20 Hz, it becomes 15 Hz, and the compressor is not operated on / off. Therefore, a comfortable living space can be secured.

According to the third aspect of the present invention, the determination of the magnitude of the air conditioning load is made based on the number of times the compressor is disconnected during the operation when the compressor is operated at a low frequency. It is characterized by

According to the invention described in claim 3, the compressor is operated at a low frequency (for example, 15 Hz). Then, when the air conditioning load is small, the compressor is repeatedly turned on and off as shown in FIG. 2A, but when the air conditioning load is large, the compressor is turned on and off as shown in FIG. 2B. Do not repeat. Therefore, the magnitude of the air conditioning load can be determined based on the number of times the compressor is turned on and off.

Further, in the invention according to claim 4, in the heating operation in the low frequency region when the air conditioning load is small, the blowing direction from the indoor unit installed above the living space is the ceiling direction. And

According to the fourth aspect of the present invention, during the heating operation in the low frequency region when the air conditioning load is small, the blowing direction from the indoor unit is directed to the ceiling side as shown in FIG. Then, a warm air layer is formed along the ceiling, and the heating effect is improved by the radiation of this warm air layer.

Further, in a fifth aspect of the present invention, when the air conditioning load is small, when the operation at the lowest frequency is continued, the operation is intermittently performed at a frequency higher than the lowest frequency. And

According to the invention of claim 5, when the air conditioning load is small and the operation of the lowest frequency is continued, the operation is intermittently performed at a frequency higher than the lowest frequency. With this configuration, the compressor operates at a relatively high speed, so that the amount of oil discharged in the compressor can be appropriately maintained.

According to the sixth aspect of the present invention, when a stop instruction is issued during low speed operation, the operating frequency of the compressor is temporarily increased and then the compressor is stopped. Characterize.

According to the sixth aspect of the present invention, when the stop instruction is given during the low speed operation, the compressor operating frequency is temporarily increased and then the compressor is stopped. In this way, the ratio of the amount of oil discharged in the compressor is reduced, so that the next startup of the compressor will be smooth.

Further, the invention according to claim 7 is characterized in that when the indoor temperature becomes equal to or lower than a specified temperature during the heating operation period, the operation is automatically performed so as to maintain the specified temperature.

According to the invention of claim 7, for example, 1
If the indoor temperature is regulated to 0 ° C., it becomes possible to prevent condensation on the wall surface in the winter season, which is a problem in a highly insulated house.

The invention according to claim 8 is characterized in that the dehumidifying operation is automatically performed when the indoor humidity is equal to or higher than the specified humidity.

According to the eighth aspect of the present invention, for example, if the indoor humidity is regulated to 75%, it is possible to prevent dew condensation on the wall surface during the rainy season, which is a problem in a highly insulated house. Becomes

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the illustrated embodiments. The air conditioner used in this embodiment has the same configuration as that shown in FIG. 8, but the storage data (control table) of the ROM (control data storage means) 121 is different. In addition, the same reference numerals are given to the already described portions, and redundant description is omitted.

(1) First Embodiment This embodiment describes a method for determining the air conditioning load in the living space, and means for ensuring a comfortable living space regardless of the air conditioning load.

Heating Operation In the present embodiment, the ROM 121 is stored in FIG.
The data shown in (B) is stored. FIG.
(A) is the same as the data shown in FIG.

The principle of this embodiment is to maintain the comfortable heating operation by changing the operating frequency of the compressor according to the size of the air conditioning load of the house.

First, a method for determining the air conditioning load (heat load) will be described.

The air conditioning load is determined by the heat insulation of the building, the size of the space to be conditioned, the ventilation rate, the outside air temperature, the solar radiation, the set temperature of the air conditioning, the internal load of the lighting, the cooking utensils and the like. Therefore, the value of the air conditioning load differs depending on the individual building.

Therefore, in the building where the air conditioner is actually installed, the magnitude of the air conditioning load is determined based on the operation history of the operation frequency of the compressor 101. That is, the compressor 101 has the lowest frequency (10 Hz in this embodiment).
When, for example, the intermittent operation at 0 Hz and stop (0 Hz) is repeated three times (state of FIG. 2A), it is determined that the air conditioning load is small.

On the contrary, the number of times of occurrence of the intermittent operation is one, or as shown in FIG.
If does not stop, it is determined that the air conditioning load is large.

The above is the method for determining the magnitude of the air conditioning load.

Next, the case where the heating operation is performed by the air conditioner shown in FIG. 8 when the outside air temperature is about 10 ° C. will be described.

When the air conditioning load obtained as described above is small, the minimum frequency of the operating frequency of the compressor is reduced and the allocation frequency in the low frequency region is reduced by using the data shown in FIG. 1 (B). Do more.

For example, the lowest frequency of the conventional compressor is 15H, but it is set to 10Hz in this embodiment, and the allocation frequency of the conventional low frequency range is "0, 15, 2".
"0,25,30,37, ..." is replaced with "0,10,15,20,25,30,37, ...
... ", and while the frequency is low (0, 10, 15, 20, 2
5 Hz) is set at 5 Hz intervals so that the operating frequency of the compressor can be set finely.

In this way, it becomes possible to finely set the operating frequency of the compressor, and even when the air conditioning load is small, intermittent operation (on / off) of the compressor can be prevented, as shown in FIG. It is possible to secure a comfortable living space.

When the air conditioning load is large, the compressor can be operated based on the control table of FIG. 1 (A) as in the conventional case, and the comfortable air conditioning state as in FIG. 10 (A) can be secured.

Cooling operation Next, in a house where the air conditioning load is small, the outside air temperature is 30%.
The cooling operation in the case of about ℃ (not too high) will be described.

As in the heating operation, the lowest frequency (10 Hz) is reduced in the compressor operation frequency control table (see FIG. 1B).

By doing so, it becomes possible to finely set the operating frequency of the compressor, and even when the air conditioning load is small, the air conditioning load is large (see FIG. 11A).
Similarly to the above, it is possible to prevent the compressor from being intermittently turned on and off, and to prevent an increase in humidity due to the re-evaporation of water in the indoor heat exchanger, so that a comfortable living space can be realized.

When the air conditioning load is large, the compressor can be operated based on the table of FIG. 1A as in the conventional case, and the comfortable air conditioning state as in FIG. 10A can be secured.

Further, depending on the user's request, the operation mode may be selected depending on whether the air conditioning load is large or small so that the air conditioning load can be operated. That is, as in the case of power saving operation (labor saving operation), the operation mode may be selected by the user selecting and pressing the switch for designating the magnitude of the air conditioning load provided on the remote controller.

Furthermore, according to this embodiment, a comfortable living space can be secured regardless of the air conditioning load of the building by simply changing the data in the ROM of the conventional air conditioner system. Therefore, even if the building in which the air conditioner system is already installed is modified and the air conditioning load is reduced, the present embodiment example can be applied, which is very convenient.

(2) Second Embodiment The present embodiment not only increases the frequency allocation in the low frequency range in the operation mode when the air conditioning load is small (see FIG. 1B), but also FIG. As shown in, the shift width of the operating frequency is also set to be small (for example, 10 →
The shift width is set to a 4 Hz difference such as 14 → 18.

In this way, the operating frequency of the compressor is set more finely, so that the comfort in the steady state (state without ON / OFF) is further improved.

(3) Third Embodiment Example The present embodiment example is intended to make the heating operation in a steady state (no ON / OFF state) more comfortable when the air conditioning load is small.

That is, as shown in FIG. 5, the blowing direction of the indoor unit 3 installed above the wall 1 in the room or on the ceiling 2 is
Move the louver 4 to make it nearly horizontal.

As a result, since the warm air layer 5 is formed near the ceiling surface and the radiation effect from the ceiling surface is increased, the heating effect is improved and the living space in which the user is located hardly blows the wind. Discomfort due to hitting is eliminated, and a more comfortable air conditioning state can be realized.

Further, since the warming layer 5 is formed, the air conditioning load of the air conditioner is slightly increased, so that the possibility that the compressor is turned off (disconnected state) is reduced.

In this operation mode, the amount of air blown from the indoor unit 3 is increased to the extent that a short circuit does not occur,
It is desirable that the thickness of the warm air layer 5 is not too thick in consideration of the distance from the facing wall 1a.

(4) Fourth Embodiment This embodiment considers the reliability (life) of the compressor when the air conditioning load is small.

The compressor is operated at a low frequency (eg 10H).
It is known that the amount of oil discharged in the compressor increases with respect to the amount of refrigerant circulation when the compressor is operated for a long time in z). Therefore, intermittently (for example, once every 15 minutes for about 2 minutes) in order to keep the amount of oil discharged in the compressor proper.
To increase the operating frequency (for example, 10Hz →
52 Hz), the operation of recovering the oil in the refrigeration cycle is performed.

In this way, the oil in the compressor can be maintained at an appropriate level, so that the compressor can be operated for a long period of time while maintaining its reliability.

Further, if there is a stop instruction during operation of the compressor at a low speed frequency, the next startup can be smoothly performed by temporarily increasing the operating frequency of the compressor and then stopping the compressor.

(5) Fifth Embodiment This embodiment is intended to prevent the problem of dew condensation, which is a problem in a highly heat-insulated and airtight house, and realize a more comfortable indoor environment.

Specifically, in the heating operation period, even when the user does not request the operation of the air conditioner, the air conditioner automatically operates to prevent the occurrence of dew condensation in the building. It was done like this.

That is, as shown in FIG. 6, the heating operation is started when the room temperature reaches the specified temperature TL (lower limit value, eg, 10 ° C.), and thereafter, the specified temperature TU (upper limit value, eg, The air conditioner is operated so as to be turned off when the temperature becomes 12 ° C.

By performing the air-conditioning operation as described above and keeping the room temperature or the wall temperature higher than the dew point temperature (for example, 8 ° C.), it is possible to prevent the dew condensation on the inner wall or inside the wall.

Further, the room temperature is set to a specified temperature (for example, 10
By keeping the temperature to 12 ° C.), the heat storage load of the building is reduced and the start-up of air conditioning is accelerated, so that a comfortable indoor environment can be immediately realized.

Further, since the possibility of dew condensation changing depending on the indoor humidity, the specified temperatures TL and TU are determined based on the indoor humidity and the indoor temperature to operate the air conditioner more finely. It is also possible to control.

Further, instead of the specified temperatures TL and TU described above, as shown in FIG. 7, the center value may be used as the target value TM and the control width dT may be used to perform on / off control of the compressor.

(6) Sixth Embodiment Example This embodiment example relates to the energy saving in the above-mentioned fifth embodiment example.

The purpose of this heating operation is to prevent the dew condensation of the building, and to apply not the usual operation in consideration of the comfort of the occupants, but the operation mode in which energy saving is prioritized.

That is, the COP (coefficient of performance) of the compressor
ON / OFF operation is performed using the highest operation frequency of.

In this way, energy saving operation becomes possible.

(7) Seventh Embodiment In this embodiment, the ventilation rate of the indoor unit is controlled in consideration of the comfort of the occupant during the dew condensation prevention operation.

At night, a small amount of air is blown to the occupants so as not to cause noise or discomfort due to drafts caused by airflow. On the other hand, during the daytime, the energy saving is emphasized, and the air is blown at a low wind volume.

At this time, like the third embodiment, if the louver is used to make the air blowing direction horizontal (see FIG. 5), drafts in the living area can be prevented.

(8) Eighth Embodiment Example This embodiment example prevents dew condensation in a building when the indoor humidity is high, such as in the rainy season, to realize a comfortable indoor environment.

That is, the indoor humidity is the specified humidity (for example, 75
%) Or more, the air conditioner automatically performs dehumidification operation to prevent dew condensation on the inner wall or inside the wall, and prevent mold.
Prevents the deterioration of the indoor environment due to the occurrence of ticks.

This dehumidifying operation is performed based on the detected value of the humidity sensor (111 in FIG. 8) provided in the indoor unit to a predetermined value (for example,
(65%), the operation is continued, and when the predetermined value is reached, the indoor blower 105 is also stopped together with the compressor 101. As a result, the indoor heat exchanger 10 when the compressor is stopped
The re-evaporation of water from No. 4 is eliminated, and it becomes possible to prevent an increase in indoor humidity due to the re-evaporation.

Alternatively, the compressor 101 may be continuously operated for a predetermined period of time (for example, 20 minutes) to dehumidify, and then the compressor 101 and the indoor blower 105 may be stopped.

As the dehumidifying operation, if the indoor temperature is low, isothermal dry is selected, and if the indoor temperature is high, cooling dry is selected, thereby making it more comfortable when the occupant is in the room. Can be air-conditioned.

[0080]

As described above, according to the inventions described in the claims, the operating frequency of the compressor is changed according to the magnitude of the air conditioning load. Even when used in a heat-insulated and airtight house, the compressor is prevented from being repeatedly turned on and off, and more comfortable air conditioning is realized. Also,
Dew condensation on the inside of the wall and the surface of the inner wall due to the large temperature difference between the inside and outside of the room, which is a problem in highly insulated and airtight houses, is prevented, and a more comfortable indoor environment is realized.

[Brief description of drawings]

FIG. 1 is stored data of a control table used in the first embodiment of the present invention, (A) is a first table used when the air conditioning load is large, and (B) is a case where the air conditioning load is small. It is the second table used.

2A and 2B are diagrams illustrating a method of determining the magnitude of an air conditioning load in the first embodiment example, FIG. 2A is a diagram when the compressor is intermittent and the air conditioning load is small, and FIG. It is a figure when the air-conditioning load is large.

FIG. 3 is a diagram of the first embodiment when the compressor is not interrupted.

FIG. 4 is a diagram showing control data in the second embodiment example.

FIG. 5 is a diagram showing formation of a warm air layer in the third embodiment example.

FIG. 6 is a characteristic diagram of temperature control in the fourth embodiment.

FIG. 7 is a characteristic diagram of temperature control in the fifth embodiment.

FIG. 8 is a block diagram of a conventional air conditioner.

FIG. 9 is a diagram showing data in a control table of a compressor used in the air conditioner.

10A and 10B are characteristic diagrams of the conventional air conditioner during heating, in which FIG. 10A is a diagram of a comfortable air conditioning state, and FIG. 10B is a diagram of an air conditioning state in which the compressor is intermittent and uncomfortable.

FIG. 11 is a characteristic diagram of the conventional air conditioner during cooling, in which (A) is a comfortable air-conditioning state and (B) is a diagram showing an uncomfortable air-conditioning state due to intermittent operation of the compressor.

[Explanation of symbols]

1 wall 2 ceiling 3 indoor unit 4 louver 5 warming layer 101 compressor 102 inverter control device (compressor operation control device) 104 indoor heat exchanger 107 outdoor heat exchanger 120 operation control processing device (compressor operation control device) 121 ROM (control data) Storage means)

Claims (8)

[Claims] 1. An operating frequency of a compressor, an indoor heat exchanger, an outdoor heat exchanger, a cooling / heating switching valve, and the compressor is set in a plurality of allocation stages, and a predetermined operating frequency is set for each stage. In an air conditioner having stored control data storage means, the data storage means includes at least a first table for a living space with a large air conditioning load and a second table for a living space with a small air conditioning load, An air conditioner comprising a compressor operation control device that selects either the first table or the second table according to the magnitude of an air conditioning load to operate the compressor. 2. The operating frequency assigned and stored in the second table is set to have a minimum frequency lower than the operating frequency assigned and stored in the first table, and the operating frequency is assigned in a low frequency range. The air conditioner according to claim 1, wherein the air conditioner is increased and stored. 3. The determination of the magnitude of the air conditioning load is performed by operating the compressor at a low frequency and determining the number of occurrences of the disconnection state of the compressor during the operation. And the air conditioner according to claim 2. 4. The air according to claim 1, wherein, in the heating operation in the low frequency region when the air conditioning load is small, the blowing direction from the indoor unit installed above the living space is the ceiling direction. Harmony machine. 5. The air according to claim 1, wherein when the air conditioning load is small, when the operation at the lowest frequency is continued, the air is operated at a frequency higher than the lowest frequency intermittently. Harmony machine. 6. The compressor according to claim 1, wherein when a stop instruction is issued during low speed operation, the operating frequency of the compressor is temporarily increased and then the compressor is stopped. Air conditioner. 7. The air conditioner according to claim 1, wherein when the indoor temperature becomes equal to or lower than a specified temperature during the heating operation period, the air conditioner is automatically operated to maintain the specified temperature. 8. The air conditioner according to claim 1, wherein the dehumidifying operation is automatically performed when the indoor humidity is equal to or higher than a specified humidity.