JPH0730929B2 - Heat pump cooling and heating ventilation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat pump cooling / heating ventilation system which performs total outside air cooling / heating by a heat pump and also performs ventilation by a heat extraction side unit.

[Conventional technology]

In recent years, in a heating / cooling system using a heat pump, an indoor / outdoor unit is installed in a ceiling portion or the like in a building to increase the effective space on the indoor side, and to improve the aesthetics of the room,
Furthermore, a cooling and heating ventilation system that has a ventilation function in addition to the cooling and heating function has been put into practical use.

FIG. 6 is a configuration diagram of an embodiment of a conventional heat pump cooling / heating ventilation system. In the figure, reference numeral 1 denotes a space to be cooled and heated in a building (hereinafter referred to as a room), 2 is a ceiling partitioned by a ceiling wall 3, and 4 is an outer wall of the building. As shown in the figure, the heat extraction side unit (so-called indoor unit) 5 and the heat source side unit (so-called outdoor unit) 6 of the heat pump are arranged in the building.

The refrigerant circuit of the heat pump is a known circuit and will not be described. Since the heat extraction side unit 5 has a ventilation function,
An intake air blower 7 and an exhaust air blower 8 are provided, and heat of intake air and exhaust air is exchanged via the total heat exchanger 9 to recover exhaust heat in the room.
A refrigerant heat exchanger 10 cools or heats intake air.
In such a structure, the outdoor air is sucked from the duct 11 of the heat extraction side unit 5 by the blower 7 and the duct 12
Is supplied to the room through the outlet 13. The indoor air passes through the duct 14 from the suction port 14, is sucked by the exhaust blower 8, and is exhausted to the outside through the duct 16.

Therefore, even during the air conditioning heating operation, the fresh air outside is always
It is supplied to the room 1 while recovering indoor exhaust heat through the total heat exchanger 9.

On the other hand, in the heat source side unit 6, the heat source side refrigerant heat exchanger 17, the blower 18 and the like are configured, and the duct 19 sucks outdoor air into the heat source side unit 6 and exhausts it to the outside again by the duct 20. There is.

In such a system, since intake and exhaust of both units are duct connections, a large external static pressure is required, so a blower often uses a high static pressure blower such as a sirocco fan, and further, In the heat extraction side unit 5, the intake blower 7 also serves as an indoor blower during operation of the heat pump.

In the ventilation operation when the cooling and heating operation is stopped, the compressor is stopped and the blowers 7 and 8 of the heat extraction side unit 5 are operated.

Due to such a configuration, always fresh outdoor air,
The indoor side is cooled and heated, and exhaust air can be exhausted while recovering the exhaust heat on the air side, and at the same time, the indoor air can be ventilated while the heating and cooling is stopped.

[Problems to be Solved by the Invention]

However, in the conventional total outside air cooling and heating ventilation system,
During both heating and cooling, outdoor air is directly heated or cooled by the heat exchanger 10 of the heat extraction side unit 5 and supplied to the room 1, and the air in the room 1 is recovered through the total heat exchanger 9 after heat recovery. Since the exhaust heat is released to the outside as it is, the heat load is inevitably larger than that of a normal circulation type heat pump air conditioner that reuses indoor air.

Furthermore, this system is required not to impair the effective space in the room, so that the installation place is restricted, and the system is often installed in a ceiling with a small space. Therefore, the space for passing the duct is limited, and the duct size is reduced. I have no choice but to reduce the size.

In order to satisfy this, in reality, it is inevitable to secure the required air volume by increasing the external static pressure of the blower or providing an auxiliary blower. In this case, not only the running cost naturally increases, but also the installation of the auxiliary blower makes the construction difficult, the duct construction increases, and the total construction cost also increases.

In addition to this, if there is an opening at the boundary with the adjacent room, in order to prevent the air cooled or heated from the room 1 or the air with odor from flowing out to the adjacent room, a door or partition Or it is necessary to install an exhaust duct for deodorizing ventilation in the adjacent room, which not only increases the cost but also increases the external static pressure of the exhaust blower to compensate for the lack of deodorizing effect in deodorizing ventilation operation. However, this causes a problem that the capacity of the blower drive motor increases.

This invention has been made to solve the problems of the conventional example as described above, by effectively utilizing the exhaust heat held by the exhaust from the room, by reusing it as intake air of the heat source side unit, The purpose of the present invention is to obtain an efficient cooling / heating ventilation system which can improve the cooling / heating efficiency, improve the space factor, and prevent the odor generated in the room and the outflow of the cooled or heated air to the adjacent area.

[Means for Solving the Problems]

Therefore, the heat pump cooling / heating ventilation system according to the present invention is configured by the heat source side unit and the heat extraction side unit, the total heat exchanger is internally provided in the heat extraction side unit, and air supplied to each unit. Are connected by a duct, and perform all outside air cooling and heating by a heat pump.
In a heat pump cooling and heating ventilation system that performs total heat exchange ventilation by an exhaust blower installed in the heat extraction side unit, the unit outlet side exhaust duct of the heat extraction side unit is connected to the unit intake side duct of the heat source side unit and It is intended to achieve the above object by providing means for controlling the air volumes of the exhaust blower and the intake blower of the takeout side unit, and by providing an odor detection means between the exhaust side inlet of the heat takeout side unit and the total heat exchanger. It is a thing.

[Action]

In the heat pump cooling and heating ventilation system according to the present invention having the above-described configuration, the total amount of exhaust air from the room exhausted from the heat extraction side unit, or a part of it, passes through the intake duct of the heat source side unit by the communication duct. , Is supplied to the heat source side unit, and is controlled by means for controlling the exhaust amount of the exhaust fan of the heat extraction side unit to be larger than the intake amount of the intake blower, and when the odor detection means detects odor, the detection signal Output, the exhaust air volume of the exhaust blower of the heat extraction side unit is controlled by the control means, and the deodorizing ventilation operation is efficiently performed.

〔Example〕

 Hereinafter, this embodiment will be described with reference to the drawings.

(Configuration) FIG. 1 is a configuration diagram of a heat pump cooling / heating ventilation system according to an embodiment of the present invention.

In addition, the same or corresponding portions as those of the conventional example are represented by the same reference numerals.

In FIG. 1, 21 is a branch duct provided in the middle of the outlet side exhaust duct 16 of the heat extraction side unit 5, 22 is a branch duct provided in the middle of the intake duct 19 of the heat source side unit 6, and 23 is the above-mentioned both. It is a communication duct that connects the branch ducts 21 and 22. As a result, the exhaust air from the heat extraction side unit 5 is configured to reach the intake duct 19 of the heat source side unit 6 from the duct 16 through the communication duct 23, and be sucked into the heat source side unit 6.

(Operation) In such a configuration, in the heating and cooling operation by the heat pump, the blower 7 of the heat extraction side unit 5 and the blower 18 of the heat source side unit 6 are operated to cool or heat the room 1. Further, the blower 8 of the heat extraction side unit 5 is operated to have a ventilation function of sucking indoor air by the blower 8 and exhausting it.

Here, because of the structure of the duct air passage, the exhaust duct 16 of the heat extraction side unit 5 is on the pressurizing side of the blower 8, so the pressure becomes higher than atmospheric pressure, and the intake duct of the heat source side unit 6
Since 19 is on the suction side of the blower 18, the pressure becomes lower than atmospheric pressure.

Therefore, the air sucked from the room 1 by the blower 8 is
The air duct is branched by the branch duct 21, passes through the communication duct 23, reaches the branch duct 22, and enters the heat source side unit 6 through the heat source side intake duct 19.

In such a configuration, for example, during heating, the air temperature in the room 1 is normally maintained at about 22 ° C., and if the outdoor air temperature is 0 ° C. as an example, the heat exchange efficiency of the total heat exchanger 9 is high. Is about 80%, the air exhausted from the room 1 is about 17 ° C. in the duct 16.

By the way, in the above-mentioned conventional heat pump cooling / heating ventilation system, the exhaust gas at 17 ° C. is directly discharged to the outside. However, in the heat pump cooling and heating ventilation system according to this embodiment, the hot air discharged from the room 1 is supplied to the intake duct 19 of the heat source side unit 6 by the branch ducts 21 and 22 and the communication duct 23. The temperature of the air passing through the heat exchanger 17 of 6 becomes higher than the temperature of the outside air, so that the thermal efficiency of the heat source side unit 6 increases. In this case, the smaller the flow path resistance of the duct, the higher the thermal efficiency of the heat source side unit 6. For example,
The branch duct 21 is provided in the vicinity of the heat extraction side unit 5, the branch duct 22 is provided in the vicinity of the heat source side unit 6, and the communication duct 23 is arranged so that the length thereof becomes short. If the flow path resistance of the air is reduced as much as possible, most of the exhaust air having a temperature higher than that in the room 1 can be supplied as the intake air of the heat source side unit 6, so that the heat pump of the heat source side unit 6 is heated. Efficiency improves, and heating capacity by this increases about 10-30%. At the time of cooling, exactly the same as this, since the low temperature air exhausted from the room 1 is supplied to the heat source side unit 6,
The cooling capacity of the heat pump is increased, and the power consumption of the compressor under the same load can be reduced.

Normally, the blower 18 of the heat source side unit 6 is stopped at the same time as the compressor is stopped when the thermostat is turned off in the heating / cooling operation or when cooling / heating is not required. However, when only ventilation is performed, the heat extraction side unit is used. Operate the blowers 7 and 8 of 5. In this case, as in the conventional example, fresh air is supplied to the room 1 through the duct 11, and the ventilation air passes through the branch duct 21 and is exhausted as it is from the exhaust duct 16 to the outside. An air passage that is exhausted to the outside is formed through the communication duct 23 and the ducts 19 and 20.

FIG. 2 is a second embodiment according to the heat pump cooling / heating ventilation system of the present invention.

In this embodiment, the exhaust duct 16 of the heat extraction side unit 5
Is directly connected to the branch duct 22 of the intake duct 19 of the heat source side unit 6, and the entire amount of the exhaust gas from the heat extraction side unit 5 is supplied as the intake air of the heat source side unit 6. In this case, during the ventilation operation, the exhaust air from the room 1 is discharged from the outlet side exhaust duct 16 of the heat extraction side unit 5,
It reaches the branch duct 22 and is exhausted to the outside from the exhaust duct 19 of the heat source side unit 6 via the heat source side unit 6.

Therefore, it is not necessary to dispose the exhaust duct 16 of the heat extraction side unit 5 up to the outer wall of the building, the duct length can be shortened, and there is no need to provide an exhaust hole in the outer wall of the building, which shortens the construction period and reduces the construction cost. And it is possible to improve the aesthetics of the outer wall of the building.

FIG. 3 is a third embodiment according to the present invention,
In the duct configuration described in FIG. 2, the blower 8 for exhausting indoor air in the heat extraction side unit 5 is omitted, and the air flow in the duct is shown in FIG. 2 both during cooling and heating and during ventilation. The flow is the same as described above. That is, the blowers 7 and 18 in both units are naturally operated during cooling and heating, but even during ventilation, the heat source side unit 6 is
The blower 18 is operated, and the blower 18 sucks indoor air and exhausts it to the outside.

In this case, as compared with the embodiment of FIGS. 1 and 2, the exhaust blower pressure of the heat extraction side unit 5 is omitted by omitting the exhaust blower 8 of the heat extraction side unit 5, so that the blower 18 of the heat source side unit 6 is reduced.
In addition, a blower that has a high static pressure outside the machine and can secure a required air volume may be used.

As a result, the number of blowers of the heat extraction side unit 5 can be one, so that, in addition to the above-described effects, the cost can be reduced due to the reduction in size and weight of the heat extraction side unit 5.

FIG. 4 is a fourth embodiment according to the present invention, and FIG. 5 is a table showing operation modes and air volume modes of the intake blower 7 and the exhaust blower 8 of the heat extraction side unit 5 in this embodiment.

In FIG. 4, 21 is an adjoining chamber, 22 is a passage, 23 is a partition with the adjoining chamber, 24 is an odor detecting means provided between the exhaust side inlet of the heat extraction side unit 5 and the total heat exchanger 9. Reference numeral 25 is a sensor, and 25 is a controller that is a means for controlling the air volumes of the intake blower 7 and the exhaust blower 8 of the heat extraction side unit 5.

Next, the operation of this embodiment will be described.

In this embodiment, the air flow in the heating / cooling and ventilation operation by the heat pump is exactly the same as that in the first embodiment, and therefore the detailed description is omitted.

Here, the intake blower 7 and the exhaust blower 8 of the heat extraction side unit 5 are controlled by the controller 25 according to the operation mode shown in FIG. That is, during ventilation operation, the air volume mode of the exhaust blower 8 is strong, and the air volume mode of the intake air blower 7 is medium, so the exhaust volume> intake volume, and the air pressure in the room 1 becomes lower than the air pressure (atmospheric pressure) in the adjacent room 21. The odor in the room 1 will not flow out to the adjacent room 21, and the air flow in the building will be in the direction of arrow A.

Further, during cooling / heating operation, when the cooling / heating load is high, at the start of operation, etc., the air volume mode of the intake blower 7 becomes strong and the exhaust volume and the intake volume become equal in order to secure the cooling / heating capacity, but the time ratio in actual operation is small. It doesn't matter.

Further, when the air volume mode of the intake air blower 7 is in the middle, the air volume mode of the exhaust air blower 8 is strong, and when the air volume mode of the intake air blower 7 is weak, the air volume mode of the exhaust air blower 8 is medium. That is, since the exhaust volume> the intake volume, the air pressure in the room 1 becomes lower than the air pressure (atmospheric pressure) in the adjacent room 21 as in the case of ventilation, so that the odor in the room 1 or the cooled or heated air enters the adjacent room 21. It will not flow out, and the air flow in the building will be in the direction of arrow A.

When the odor sensor 24 detects the odor of the exhaust gas flowing around the odor sensor 24 during this period, the controller 25 makes the air volume mode of the exhaust blower 8 strong by the detection signal and performs deodorant ventilation. If the odor disappears, the air flow rate mode of the exhaust blower 8 is returned to the normal operation mode, and the intake / exhaust heat exchange efficiency in the total heat exchanger 9 is not extremely reduced, and efficient deodorization without insufficient deodorization or excessive exhaust operation. It is possible to operate the cooling and heating ventilation system including ventilation.

As a result, it is possible to prevent odorous air or cooled or heated air from flowing out of the room 1 to the adjacent room 21, so that the coefficient of performance of the system is improved and a comfortable air-conditioned space free from odor pollution is realized. be able to. As a result, it is necessary to provide a door and a partition for preventing the outflow of odor and cooled or heated indoor air in the passage 22 as in the conventional case, and to provide an exhaust duct for deodorizing ventilation (not shown) in the adjacent chamber 21. It will be eliminated and the construction cost will be greatly reduced.

Furthermore, as another embodiment, in order to make the exhaust air volume from the room larger than the intake air volume, the cross-sectional area of the exhaust ducts 15, 16 of the heat extraction side unit 5 may be made larger than the cross-sectional area of the intake ducts 11, 12. The length of the exhaust duct 15 is shorter than the length of the intake duct 11 so that the pressure loss of the exhaust ducts 15 and 16 is less than the pressure loss of the intake ducts 11 and 12, and the exhaust fan of the heat extraction side unit 5 By making the capacity of 8 larger than the capacity of the intake blower 7, the exhaust air volume from the room 1 can be made larger than the intake air volume, and the cooling / heating ventilation system including deodorant ventilation can be efficiently operated.

〔The invention's effect〕

As described above, according to the present invention, since the outlet side exhaust duct of the heat extraction side unit is configured to be connected to the intake duct of the heat source side unit, the intake air temperature to the heat exchanger of the heat source side unit can be controlled. The air temperature can be lower than the outdoor air temperature during cooling, and can be higher on the contrary during heating, and the cooling and heating capacity of the heat pump is improved, so that the power consumption of the compressor can be reduced.

Further, when the cooling and heating capacity is the same as in the conventional example, the external static pressure of the blower of the heat source side unit can be reduced, so that the blower can be downsized and its capacity can be reduced.

In addition, when there is no choice but to lengthen the intake and exhaust ducts of the heat source side unit due to the restrictions on the installation location of the system, conventionally,
The present invention eliminates the need for the auxiliary blower disposed in the middle of the intake or exhaust duct, so that the construction period can be shortened and the construction cost can be reduced.

In addition, since the exhaust air volume of the exhaust fan of the heat extraction side unit is controlled to be larger than the intake air volume of the intake blower, not only can odor be efficiently discharged in each mode of cooling and heating and exhaust operation, but also indoor air It is possible to prevent outflow to the adjacent room and improve the coefficient of performance of the heat pump cooling and heating ventilation system. Furthermore, by controlling the exhaust air volume by the detection signal of the odor detection means, a comfortable air space without odor pollution is realized, and deodorization shortage and excessive ventilation operation are prevented, and efficient deodorization ventilation and cooling / heating ventilation system. Can drive.

Therefore, it is not necessary to install a door or partition that is conventionally provided to prevent the outflow of odor-contaminated air into the adjacent room, or to install an exhaust duct for deodorizing ventilation in the adjacent room.
The construction cost required for this can also be saved.

[Brief description of drawings]

FIG. 1 is a block diagram of a heat pump cooling and heating ventilation system according to an embodiment of the present invention, FIG. 2 is a block diagram of a heat pump cooling and heating ventilation system according to a second embodiment of the present invention, and FIG. Fig. 4 is a block diagram of a heat pump cooling / heating ventilation system according to an example, Fig. 4 is a block diagram of a heat pump cooling / heating ventilation system according to a fourth embodiment, and Fig. 5 shows indoor air intake and exhaust air volume modes in each operation mode of the above system. FIG. 6 is a table, and FIG. 6 is a configuration diagram of a heat pump cooling / heating ventilation system according to a conventional example. 11 is a heat extraction side unit intake duct, 16 is a heat extraction side unit exhaust duct, 19 is a heat source side unit intake duct, 20
Is a heat source side unit exhaust duct, 21 and 22 are branch ducts, 23 is a communication duct, 24 is an odor sensor, and 25 is a controller. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (2)

[Claims] 1. A heat source side unit and a heat extraction side unit, a total heat exchanger is internally provided in the heat extraction side unit, and air supplied to each unit is connected by a duct, In the heat pump cooling / heating ventilation system, which performs total outside air cooling / heating with a heat pump, and performs total heat exchange ventilation with an exhaust blower provided in the heat extraction side unit during both cooling / heating and when cooling / heating is stopped A heat pump cooling and heating ventilation system in which an outlet side exhaust duct is connected to a unit intake side duct of a heat source side unit. 2. A means for controlling the air volumes of the exhaust blower and the intake blower of the heat extraction side unit is provided, and odor detection means is provided between the exhaust side inlet of the heat extraction side unit and the total heat exchanger. The heat pump cooling and heating ventilation system according to claim 1.