JPH0827052B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner used for air conditioning such as heating and cooling of a building.

[Conventional technology]

In the conventional direct expansion air conditioning system, a single outdoor unit is connected with a plurality of indoor units and an outdoor air processing dedicated machine that has a total heat exchanger built-in and is capable of heat recovery by refrigerant pipes, and air conditioning, ventilation, Although it was designed to perform humidification, dust removal, and heat recovery, the dedicated outdoor air treatment equipment has an air volume corresponding to the floor area that can be air-conditioned by the outdoor unit, and a constant air volume is maintained regardless of the number of operating indoor units. It was a system to supply to. For this reason,
Ventilation was also performed in rooms where the indoor unit was stopped unattended, and in addition to ventilation, humidification was performed during heating, which was contrary to the energy conservation. In addition, the demand for indoor air conditioning in the middle seasons such as spring and autumn, and in the winter season is increasing due to office automation and intelligentization. The cold outside air in the winter and the heat exchanged with the exhaust air of the indoor air warmed up and entered the room, impeding the cooling effect.
Therefore, although a system having a mechanism for bypassing the total heat exchanger has been proposed, it is not possible to easily determine which of the outside air temperature and the room temperature is lower indoors in the middle period, and it is possible to determine the bypass time. could not.

FIG. 2 shows a cross section of a conventional direct expansion multi-air conditioner,
1 is composed of a compressor, a non-use side heat exchanger, etc., an outdoor unit installed on the roof of a building, etc. 2 is composed of a use side heat exchanger, a blower, a throttle device, a high-performance filter 2b, etc.,
It is an indoor unit installed behind the ceiling. 3 is a machine for treating the outside air, as shown in FIG.
Filter 23, blower 6a for sucking in outside air, user side heat exchanger 2
6, intake path A consisting of humidifier 7 and outdoor air outlet 8
And an exhaust passage B consisting of the indoor air inlet 9, the second filter 10, the indoor air exhaust blower 6b, and the indoor air outlet 11.
And a total heat exchanger 5 provided between the intake passage A and the exhaust passage B and exchanging heat of the air passing therethrough. The indoor unit 2 and the outdoor air processing dedicated device 3 are connected to the outdoor unit 1 via a refrigerant pipe 22. Numerals 14 and 14a are ducts that connect the outdoor air treatment-dedicated machine 3 and the indoor units 2 and their connecting portions, 24 is a building, and 25 is its ceiling.

Next, the operation of the above conventional device will be described. At the time of cooling, the outdoor air processing dedicated machine 3 is operated in conjunction with the outdoor unit 1 and the indoor unit 2 to perform indoor cooling, dust removal, and ventilation. At the time of heating, the refrigerant circuit is switched to a heating cycle by a four-way valve or the like to heat the room with the indoor unit 2 on the condensation side and the outdoor unit 1 on the evaporation side. During this cooling or heating, the outside air processing dedicated machine 3 continues its rated capacity operation regardless of the number of operating indoor units 2.
Full operation is performed until all the indoor units 2 are stopped. Further, the outdoor air and the indoor air are heat-exchanged by the total heat exchanger 5 during cooling or heating, and air having a temperature lower than the outside temperature during cooling is introduced into the indoor unit 2 during heating. .

[Problems to be Solved by the Invention]

The conventional direct expansion multi-air conditioning system is configured as described above, and even in an unmanned room that does not require air conditioning, ventilation and humidification are performed, which causes a problem of energy loss.
Further, since the outdoor heat treatment dedicated machine 3 has the total heat exchanger 5, the cooling effect is obstructed in the intermediate period and the winter season, and a bypass air passage is provided in the total heat exchanger 5 to introduce the outdoor air into the room without heat exchange. Even in such a case, it is necessary to confirm that the outside air temperature is lower than the room temperature and switch to the bypass air passage, which makes it difficult to judge the switching timing.

The present invention has been made to solve the above problems, and it is possible to obtain an air conditioner that can ventilate and humidify only a room requiring air conditioning and can perform energy saving operation. To aim.

Another object of the present invention is to obtain an air conditioner that can automatically switch to the bypass air passage and has a sufficient cooling effect even in the intermediate period and the winter season.

[Means for solving the problem]

An air conditioner according to the present invention is an indoor unit having a blower for sending outdoor air and indoor air from an air-conditioned room to a duct via a heat exchanger, and each air-conditioned room in the duct. And an air volume controller for adjusting the air volume and a switch for performing on / off operation of these air volume controllers, and the air volume controller turned on by the switch for the capacity of the total air volume controller. The air flow rate control means for controlling the air flow rate of the outdoor air is provided in accordance with the output from the controller that calculates the ratio of the total capacity.

In addition, a bypass path that bypasses the total heat exchanger in the intake path or exhaust path of the outside air processing machine, and the indoor air suction port side and the outdoor air suction port side temperature of the outside air processing machine are respectively detected. The first and second temperature detecting means and the bypass path opening / closing control means for opening / closing the bypass path according to the temperature difference between the first and second temperature detecting means during cooling are provided.

[Action]

In the present invention, an air flow controller is provided in the duct connecting the indoor unit and each room to be air-conditioned, and the outdoor air intake amount is controlled by the on / off operation state thereof. And this control is performed based on the switching operation of the switch which carries out the ON / OFF operation of the air flow controller.

In addition, if the temperature of the indoor air intake side and the temperature of the outdoor air intake side of the dedicated outdoor air processing device are respectively detected, and if the outdoor air temperature is lower during cooling, the bypass path is opened, and if necessary, the outdoor air processing dedicated device The heat exchanger on the utilization side provided in the intake passage of the is operated.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an air conditioner according to a first embodiment of the present invention, in which 1 is an outdoor unit, 2 is an indoor air intake port 2a, a high-performance filter 2b, a heat exchanger 2c, a blower 2d, and an outside air treatment unit. An indoor unit having an inlet 2e and an outlet 2f, 3 is an outdoor air suction port 4, a high-performance filter 23, a total heat exchanger 5, an outdoor air suction blower 6a,
An air intake path A including a heat exchanger 26, a humidifier 7 and an outdoor air outlet 8, an indoor air inlet 9, a medium performance filter 10, a total heat exchanger 5, an indoor air exhaust blower 6b and an indoor air outlet.
A machine for treating the outside air having an exhaust passage B consisting of 11 is provided at a connecting portion 14a of a duct 14 communicating between an outlet 2f of the indoor unit 2 and each room (a room to be air-conditioned) 13 with each room 13. An air volume controller, 15 is a switch provided in each room 13 for operating the air volume controller 12 and setting the room temperature, 16 is a controller for the indoor unit 2, 17 is a controller for the outside air processing dedicated machine 3,
18 is an inverter for indoor blower 2d, 19 is an outside air processing dedicated machine 3
Inverter for the blowers 6a, 6b, 20 is the connecting portion 14a of the duct 14
To 21 to each room 13, 21 is an air duct connecting each room 13 to the indoor air suction port 2a of the indoor unit 2, and 22 is communication to the outdoor unit 1, the indoor unit 2 and the outside air treatment dedicated device 3. Refrigerant piping,
27 is a switch for the indoor unit.

Next, the operation will be described. When the indoor unit switch 27 is turned on to enter the cooling mode, the air in each room 13 passes through the air duct 21 and enters the suction port 2a of the indoor unit 2 to be dust-removed by the high-performance filter 2b, and the heat exchanger (evaporator). It is cooled by the blower 2d and is blown out from the outlet 2f. At this time, the outside air processing dedicated machine 3 is also operated at the same time, the outside air taken in through the suction port 4 is removed by the high performance filter 23, and the total heat exchanger 5,
It passes through the blower 6a, is cooled by the heat exchanger (evaporator) 26, and enters the treated outside air intake 2e of the indoor unit 2 through the blowout port 8 and
It is mixed with the indoor air and blown into the duct 14. The outside-air-treated and cooled air passes through the duct 14 and is distributed to each room 13 in an air volume corresponding to the capacity of the air volume controller 12 provided for each room 13. Further, a part of the recirculation air passes from the duct 21 through the suction ports 2a, 9 and the medium performance filter 10 to the total heat exchanger 5
The heat is exchanged by the air blower 6b, and the air is discharged from the indoor air outlet 11 to the outside by the blower 6b. Further, during heating, the heat exchangers 2c and 26 of the indoor unit 2 and the outside air processing-dedicated device 3 act as a condenser by switching the four-way valve (not shown) of the outdoor unit 1 and are humidified by the humidifier 7. The outside air and the indoor air are heated by the heat exchanger 2c of the indoor unit 2 and blown out into the room. On the other hand, when some of the switches 15 of the air volume controller 12 are off at the time of cooling or heating or when the operation is started, that is, when there is no person in some of the rooms 13, the indoor unit 2 receives the signal from the switch 15. For controller 16
But The following formula is calculated, and the result is the inverter for indoor blower 2d 18
The controller that is the air flow rate control means at the same time
It is also sent to 17, and the blowers 6a, 6a
It controls the inverter 19 for b, and the blowers 2d, 6a, 6
The air flow rate of b is controlled according to the result of the above equation. Therefore, the outside air intake amount and the humidification amount can be controlled according to the usage status of each room 13, and energy saving operation can be performed and low noise operation can be performed.

FIG. 4 shows the structure of the air conditioner according to the second embodiment of the present invention, in which 28 is an operation switch for the indoor unit 2 and the outside air processing dedicated device 3, and first and second temperature detecting means 29a, 29b.
Is a thermistor, 30 is a bypass duct formed by bypassing the total heat exchanger 5 in the exhaust passage B or the intake passage A (in this case, the exhaust passage B), C is a bypass passage, and other configurations are the first. It is similar to the embodiment.

Next, the operation of the above configuration will be described. When the switch 28 is turned on to enter the cooling mode, the air in the room 13 is cooled by the air duct 21.
Through the suction port 2a of the indoor unit 2 through the high-performance filter 2b
The dust is removed by and is cooled by the heat exchanger (evaporator) 2c.
It is blown out from the outlet 2f by 2d. At this time, the outside air processing dedicated machine 3 is also operated at the same time, the outside air taken in from the outdoor air suction port 4 is dedusted by the high performance filter 23, cooled by the heat exchanger 26 through the total heat exchanger 5 and the blower 6a, From the outdoor air outlet 8 enters the treated outside air intake 2e of the indoor unit 2, is mixed with the indoor air, and is blown out to the duct 14. The outside air treated and cooled air is distributed through the duct 14 to an air volume corresponding to the capacity of the air volume controller 12 provided in each room,
Blow out to 13. In addition, a part of the air is sucked in from the duct 21.
The heat is recovered by the total heat exchanger 5 through the intermediate performance filters 2a and 9 and is discharged to the outside from the indoor air outlet 11 by the blower 6b. Further, during heating, the heat exchangers 2c and 26 act as a condenser by switching the four-way valve (not shown) of the outdoor unit 1 and the outside air and the indoor air humidified by the humidifier 7 are changed by the heat exchanger 2c. It is heated and blown out indoors. On the other hand, spring, temperature I _t and outdoor interim or winter when the cooling load is generated by the OA equipment and the like at room 13, a thermistor 29b provided in the room air inlet port 9 side of the outside air processing dedicated machine 3 fall like Air suction port 4
The temperature O _{t of the} thermistor 29a provided on the side is, for example, I _t −O _t
When ≧ 10 deg, the controller 17, which is the bypass passage opening / closing control means and the heat exchanger control means, opens the bypass duct 30 to form the bypass passage C. Therefore, the medium performance filter 23
The indoor air that has passed through does not pass through the total heat exchanger 5 but blower 6
b. The inside air is discharged to the outside through the indoor air outlet 8, and the outside air is supplied to the inside of the room 13 without heat exchange by the total heat exchanger 5, so that the inside of the room 13 is effectively cooled. Also, 10deg> I _t −O
_{When t} ≧ 5 deg, there is not much temperature difference, so the bypass path C is opened, and the controller 27 is used to cool the outside air by using the heat exchanger 26 as an evaporator so that cooling can be performed effectively. To be seen.

In addition, although the said Example demonstrated the case of a direct expansion air-conditioning system, the same effect can be produced also in the case of a water system.

〔The invention's effect〕

As described above, according to the present invention, the air flow rate controller for the duct connecting the indoor unit and each air-conditioned room is provided, and the outdoor air intake rate is controlled by the on / off operation state thereof.
The unmanned room in which the air flow controller is in the off state is not air-conditioned, and it is possible to perform air-conditioning without excess or deficiency and perform energy-saving operation. Such control is performed based on the switching operation of the switch that turns the air volume controller on and off, and should be achieved by a control device that is stable, reliable, and has a simple structure. You can

Further, when the outdoor air is lower than the temperature of the indoor air during cooling, the bypass passage is opened to stop the heat exchange in the total heat exchanger, and it is possible to effectively cool each room by using the outdoor air. . Moreover, since the outside air is also cooled if necessary, optimum cooling can always be automatically performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioner according to a first embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional air conditioner, and FIG. 3 is a front view of a conventional outside air processing dedicated device, and FIG. Is the second of this invention
It is a block diagram of the air conditioner by the Example of. 1 ... outdoor unit, 2 ... indoor unit, 2a ... indoor air inlet,
2c …… User side heat exchanger, 2d …… Blower, 3 …… Outdoor air treatment machine, 4 …… Outdoor air intake port, 5 …… Total heat exchanger, 6a
...... Blower for sucking outside air, 6b …… Blower for discharging indoor air,
7 ... Humidifier, 8 ... Outdoor air outlet, 9 ... Indoor air inlet, 11 ... Indoor air outlet, 12 ... Air flow controller, 13
...... Room (room to be air-conditioned), 14 ...... duct, 16,17 …… Controller, 22 …… Refrigerant piping, 26 …… Heat exchanger, 29a, 29b
…… Thermistor, 30 …… Bypass duct, A …… Intake path, B …… Exhaust path, C …… Bypass path. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

[Claims] 1. An indoor unit having a blower for sending outdoor air and indoor air from an air-conditioned room to a duct via a heat exchanger, and sending the air to the duct via the heat exchanger. An outside air processing dedicated machine having a total heat exchanger for performing heat exchange between an intake path for sucking the outdoor air and an exhaust path for discharging a part of the indoor air from the air-conditioned room Alternatively, a bypass passage provided by bypassing the total heat exchanger in the exhaust passage, and first and second temperature detecting means for detecting the temperatures of the indoor air intake port side and the outdoor air intake port side of the dedicated outdoor air treatment machine, respectively. , The first and second during cooling
In which the bypass passage opening / closing control means for controlling the opening / closing of the bypass passage according to the temperature difference detected by the temperature detecting means is provided, the outdoor unit having the compressor and the unused side heat exchanger is provided, and the outdoor unit, the indoor unit An air conditioner characterized in that a refrigeration cycle is formed by connecting the air conditioner and an outside air treatment device with a refrigerant pipe. 2. A heat exchanger provided in the intake passage of the outside air treatment-dedicated machine and provided in the intake passage of the outside air treatment-dedicated machine according to the temperature difference detected by the first and second temperature detection means. The air conditioner according to claim 1, further comprising heat exchanger control means for controlling the operation of the air conditioner.