JPH1089753A - Ventilation type air heat source air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation type air heat source air conditioner, which improves air-conditioning performance, restrains heat dissipation into outdoor air upon defrosting operation, and is capable of utilizing thrown energy effectively. SOLUTION: A ventilation type air heat source air conditioner is connected to an objective room of air conditioning through a duct and an indoor machine corresponding unit 10 equipped with an indoor side heat exchanger 13, an outdoor machine corresponding unit 20 equipped with an outdoor side heat exchanger 21 as well as a heat exchanger 14 for ventilation are arranged in one easing body. The heat exchanger 14 for ventilation is provided with a flow passage of a part of air-conditioning air, flowing through the duct, to effect heat exchange between the ventilating outdoor air and the flow passage. The outdoor machine corresponding unit 20 is provided with a mixing space 23, mixing the suction air of the outdoor side heat exchanger 22 into circulating air (exhaust air) passing through the heat exchanger 14 for ventilation, and an air pressure shutter 24, intercepting the outdoor side heat exchanger 22 from outdoor air upon defrosting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilating air heat source air conditioner, which performs air conditioning and ventilation such as cooling and heating of buildings such as offices and stores, dehumidification, and filtration of dust using air as a heat source. The present invention relates to an integrated ventilated air heat source air conditioner suitable for the above.

[0002]

2. Description of the Related Art Conventionally, a separate type air heat source package air conditioner is generally used for cooling and heating buildings such as offices and stores. These are composed of an outdoor unit, an indoor unit, and a refrigerant pipe connecting them. On the other hand, for example, as described in JP-A-2-287034, an integrated central air-conditioning unit has been developed for the purpose of adding a ventilation function and omitting refrigerant piping work.

[0003] Further, during the heating operation of the air heat source package air conditioner, frost is formed on the fin surface of the outdoor heat exchanger, and it is necessary to periodically perform a defrosting operation to remove the frost. During such a defrosting operation, the heating operation is interrupted. The energy consumed for defrosting is energy that does not directly contribute to heating, and a part of heat energy during the defrosting operation is lost energy that escapes to the outside.

[0004]

Problems to be Solved by the Invention
The integrated central air-conditioning unit as described in Japanese Patent Publication No. 4 realizes addition of a ventilation function and omission of refrigerant piping work.
The part corresponding to the indoor unit and the outdoor unit in the separate type air heat source package air conditioner for cooling and heating is simply provided as an integrated type, and there is room for improvement in cooling and heating performance and energy saving.

The present invention has been made in order to solve the above-mentioned problems of the prior art. After recovering a part of the air (exhaust) as heat, the air is used as a heat source of an outdoor unit to improve the air conditioning performance. It is an object (the first object) to provide a ventilation type air heat source air conditioner that improves energy consumption and realizes energy saving. Another object of the present invention (second object)
An object of the present invention is to provide a ventilating air heat source air conditioner capable of suppressing heat release to the outside air during a defrosting operation and effectively utilizing the input energy.

[0006]

In order to achieve the first object, the most basic configuration of a ventilated air heat source air conditioner according to the present invention is connected to a room to be air-conditioned through a duct. , An indoor unit, an outdoor unit, and a ventilating air heat source air conditioner integrally configured with a ventilator, the heat of the air exhausted to the outside by ventilation is recovered by a heat exchanger of the ventilator, and then the air is exhausted. Is further used as a heat source of the outdoor unit.

More specifically, the air conditioner is connected to a room to be air-conditioned through an air duct and an air supply duct, and includes an indoor unit equivalent part having an indoor heat exchanger and an outdoor heat exchanger. In an integrated ventilation type air heat source air conditioner in which an outdoor unit equivalent portion and a ventilation device having a ventilation heat exchanger are arranged in one housing, the outdoor unit equivalent portion includes the outdoor heat source. A space region is provided for mixing the intake air of the exchanger and a part of exhaust air of the conditioned air passing through the ventilation heat exchanger.

In order to achieve the second object,
The configuration of the ventilated air heat source air conditioner according to the present invention is the above-described device, further comprising an isolation unit that shuts off the outdoor heat exchanger from outside air when the outdoor heat exchanger is defrosted in the heating operation. It is. This isolating means is, for example, a wind pressure shutter provided in an outside air suction part of an outdoor unit equivalent part.

Hereinafter, the structure and operation of the present invention will be described more specifically. According to the present invention, the return air duct, that is, the return air from the air-conditioning object, is introduced into the present apparatus by the return air duct from the room to be air-conditioned, that is, the return air duct, connected to the present apparatus, and the outside air that is introduced for ventilation is returned to the return air duct. After heat exchange with a part of the air conditioner, the air conditioner performs air conditioning such as cooling and heating dehumidification and dust filtration by an air conditioner equivalent to the indoor unit of a separate type air heat source package air conditioner.
In an integrated ventilation air heat source air conditioner that supplies air to the air conditioner through the air supply duct, i.e., the air supply duct, from this device to the room to be air conditioned, the heat exchanger that has conventionally been discharged to the outside as it is after heat exchange In order to use the air (exhaust) as the heat source of the outdoor heat exchanger, an air flow path for mixing with the suction air of the heat exchanger corresponding to the outdoor unit of the separate type air heat source package air conditioner is provided. It is a thing.

Further, in the defrosting operation which cannot be avoided during the heating operation of the air heat source packaged air conditioner, the outdoor heat exchanger is provided during the defrosting operation so that the heat released to the outside air can be suppressed and the input energy can be used effectively. It is configured by providing isolation means capable of shutting off from outside air.

In a packaged air conditioner that performs cooling and heating using air as a heat source, the efficiency of the refrigeration cycle becomes higher as the outside air temperature, that is, the temperature of the air taken in by the outdoor unit is closer to room temperature. For example, in the case of heating, when the room temperature is heated to 20 ° C., the outside air temperature is lower than when the outside air temperature is 0 ° C.
It is well known that a temperature of ℃ results in a more efficient operation on a refrigeration cycle and lower power consumption.

On the other hand, in this apparatus, since the air introduced for ventilation is introduced after exchanging heat with a part of the air, the air (exhaust) after the heat exchange approaches the outside air temperature. Since the temperature exchange efficiency is generally about 50 to 70% and does not reach 100%, the temperature is closer to the ambient air temperature than to the outside air temperature. When the air (exhaust) after the heat exchange is mixed with the suction air of the outdoor unit, the temperature of the suction air of the outdoor unit approaches room temperature, the operation becomes more efficient in the refrigerating cycle, and the power consumption decreases.

In the defrosting operation required during the heating operation, a high-temperature refrigerant is caused to flow through a heat exchanger corresponding to an outdoor unit of a separate type air heat source package air conditioner to melt frost generated on the surface of the heat exchanger fin portion. The method is generally performed. The transfer of heat energy at this time is (high temperature refrigerant) →
The heat is transmitted in the order of (tube part of heat exchanger) → (fin part of heat exchanger) → (frost on the surface of the fin), but partly from (hot refrigerant) to (frost on the surface of the fin). Since the heat energy of the refrigerant escapes to the outside, all of the heat energy lost by the high-temperature refrigerant is not used for melting the frost, resulting in lost energy.

In order to prevent the air near the heat exchange from being exchanged with the outside air during the defrosting operation, the present apparatus is provided with an isolating means for shutting off the outdoor heat exchanger from the outside air. Heat energy is efficiently supplied, thereby realizing energy saving and improved heating performance by shortening the defrosting time.

Next, the operation of the present invention will be described using specific numerical values with reference to FIGS. FIG. 1 is a diagram showing an example of the relationship between the outside air temperature and the power consumption when the air heat source package air conditioner performs the heating operation, and FIG. 2 is an explanatory diagram showing an example of the air temperature during the operation of the ventilation heat exchanger. is there.

FIG. 1 shows an outside air temperature (° C.) when a certain heating capacity is exhibited in an air heat source package air conditioner in which the heating capacity can be increased or decreased by changing the operating frequency of the compressor during the heating operation. ) And power consumption (kW)
This is an example showing the relationship between the power consumption and the power consumption. That is, in the example of FIG. 1, when the outside air temperature is higher than −15 ° C. to −5 ° C., the power consumption is smaller than about 4.1 kW to 2.9 kW.

FIG. 2 shows an example of the air temperature during operation of the ventilation heat exchanger. Introducing outside air for ventilation is -1
The temperature is 0 ° C., and the air temperature from the room to be air-conditioned is 20 ° C. The former, ie, the outside air introduced for ventilation, is 5 ° C. after heat exchange, and the latter, ie, the ambient air from the room, is 5 ° C. after heat exchange. When the air from the room after the heat exchange, that is, the exhaust air, is mixed with the air taken into the outdoor heat exchanger at −10 ° C., the temperature rises to −9.4 ° C. in this example. As a result, in this example, the power consumption is reduced by about 2%.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. 3 is a perspective view showing a configuration of a ventilating air heat source air conditioner according to one embodiment of the present invention, FIG. 4 is a diagram of the device of FIG. 3, (a) is a top view, and (b) is The front view and (c) are side views.

3 and 4, reference numeral 1 denotes an integrated ventilation type air heat source air conditioner, 10 denotes a portion corresponding to an indoor unit in a separate type air heat source package air conditioner, 11
Is an air supply duct connection port for connecting to a room to be air-conditioned (not shown) via an air supply duct (not shown). The air supply duct connection port 11 is an integrated ventilation air heat source. The housing of the air conditioner 1 is open. Reference numeral 12 denotes a blower for an indoor heat exchanger, 13 denotes an indoor heat exchanger, and 14 denotes a ventilation heat exchanger.

Reference numeral 15 denotes an air inlet of a flow path for exchanging heat of a part of the conditioned air flowing through an air duct (not shown) and an air supply duct with a flow path of outside air for ventilation. , 17 is an introduction outside air inlet of a ventilation outside air passage, 18 is an introduction outside air outlet of a ventilation outside air passage, 19
Is an air duct connection port for connecting to a room to be air-conditioned (not shown) via an air duct (not shown),
This air / air duct connection port 19 is open to the housing of the ventilation type air heat source air conditioner 1.

3 and 4, reference numeral 20 denotes a portion corresponding to an outdoor unit in a separate type air heat source package air conditioner, 21 denotes a blower for an outdoor heat exchanger, 22 denotes an outdoor heat exchanger, and 23 denotes an outdoor heat exchanger. A mixing space according to a space area for mixing the intake air of the heat exchanger 22 and the exhaust of a part (circular air) of the conditioned air passed through the ventilation heat exchanger 14 is a mixing space 24 corresponding to an outdoor unit. Is a wind pressure shutter provided in the outside air suction section of FIG.

The configuration and function of the integrated ventilation type air heat source air conditioner 1 shown in FIG. 3 will be described in the case of a heating operation. The ventilation type air heat source air conditioner 1 has a portion 10 corresponding to an indoor unit, a portion 20 corresponding to an outdoor unit, and a heat exchanger 14 for ventilation arranged in one housing. A portion 10 corresponding to an indoor unit and a room to be air-conditioned are connected via a duct at an air duct connection port 19 and an air supply duct connection port 11. The ventilation heat exchanger 14 located in the portion 10 corresponding to the indoor unit has a built-in ventilation blower (not shown) and is controlled to stop in the case of a defrosting operation during heating. Things.

The outside air suction portion of the portion 20 corresponding to the outdoor unit is provided with a mixing space 23 for mixing the air, that is, the exhaust air after the heat recovery by the ventilation heat exchanger 14 with the outside air. A wind pressure shutter 24 is provided in the outside air suction portion of the mixing space 23 as a means for isolating the outdoor heat exchanger 22 from outside air during defrosting. The wind pressure shutter 24 is opened by the wind pressure when the outdoor heat exchanger blower 21 is operating and is closed when the outdoor heat exchanger blower 21 is stopped. Therefore, when the outdoor heat exchanger blower 21 is stopped during defrosting, the outdoor heat exchanger 22 is isolated from the outside air. This prevents the air near the outdoor heat exchanger 22 from being exchanged with the outside air outside the device.

Part of the air entering the apparatus from the air duct connection port 19 enters the ventilation heat exchanger 14 through the air inlet 15 and exchanges heat with the outside air entered through the introduction outside air inlet 17. A part of the heat exchanged air passes through the exhaust outlet 16, is mixed with the outside air taken in from the wind pressure shutter 24 in the mixing space 23, passes through the outdoor heat exchanger 22, and is blown by the outdoor heat exchanger blower 21. It is discharged outside the device.

The introduced outside air enters the ventilation heat exchanger 14 from the introduction outside air inlet 17 and exchanges heat with a part of the air. The air is supplied from the air supply duct connection port 11 to the room to be air-conditioned through the air supply duct by the indoor heat exchanger blower 12 through the exchanger 13.

The present embodiment has the following effects. In the mixing space 23, the air (exhaust) is mixed with the outside air to be the suction air of the outdoor heat exchanger 22, so that in the case of heating, efficient operation can be performed by the suction air at a higher temperature. Energy saving can be realized. Further, by providing a mixing space 23 for mixing and adjusting the suction air and providing a wind pressure shutter 24,
At the time of defrosting, the outdoor heat exchanger 22 can be isolated from the outside air, so that heat loss during the defrosting operation can be minimized,
Defrosting time can be shortened. As a result, improvement in heating performance and energy saving can be realized.

Further, shortening the defrosting time not only reduces running costs, but also improves defrosting, which is a major cause that has made it difficult to use an air heat source package air conditioner as a heater in a cold region, thereby improving the defrosting time. The transition from a combustion-type heater widely used in cold regions to an air-heat source package air conditioner that is all-electric can be realized. This can contribute to the problem of global warming caused by combustion exhaust, which has recently become a problem.

In the above embodiment, an example is shown in which the wind pressure shutter is used as a means for isolating the outdoor heat exchanger from the outside air during defrosting. However, the isolation means may be opened and closed by a drive device such as an electric motor. No problem. Further, in the embodiment of FIG. 3 described above, the example in which the exhaust outlet 16 is located on the side surface of the mixing space 23 is shown. However, the flow path is extended inside the mixing space so that the mixing is performed more uniformly. May be.

Further, in the above-described embodiment, an example of the heating operation has been described. However, it is needless to say that the operation with the lower intake air can be performed even during the cooling, and the efficient energy-saving operation can be realized.

[0030]

As described above in detail, according to the present invention, after recovering a part of the air (exhaust air), the air is used as a heat source of the outdoor unit to improve the air conditioning performance. A ventilated air heat source air conditioner that achieves energy saving can be provided. Further, according to the present invention, it is possible to provide a ventilation type air heat source air conditioner capable of suppressing heat release to the outside air during the defrosting operation and effectively utilizing the input energy.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a relationship between outside air temperature and power consumption when an air heat source package air conditioner performs a heating operation.

FIG. 2 is an explanatory diagram showing an example of an air temperature during operation of a ventilation heat exchanger.

FIG. 3 is a perspective view showing a configuration of a ventilating air heat source air conditioner according to one embodiment of the present invention.

FIG. 4 is a view of the apparatus of FIG. 3, wherein (a) is a top view, (b) is a front view, and (c) is a side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ventilation type air heat source air conditioner, 10 ... Part equivalent to an indoor unit, 11 ... Air supply duct connection port, 12 ... Blower for indoor side heat exchanger, 13 ... Indoor side heat exchanger, 14 ... Heat exchange for ventilation 15, 15 air inlet, 16 exhaust outlet, 17 introduction outside air inlet, 18 introduction outside air outlet, 19 ring air duct connection port, 20 equivalent to outdoor unit, 21 air blower for outdoor heat exchanger , 22 ... outdoor heat exchanger, 23 ... mixing space, 24 ... wind pressure shutter.

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[Procedure amendment]

[Submission date] November 28, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumio Harada 508-8 Yujuji, Kashiwa-shi, Chiba Pref. System Engineering Center, Hitachi Cooling Systems Co., Ltd. No. 6 Within Hitachi Systems, Ltd. Electrical Systems Business Unit (72) Inventor Toru Arai 1-23-2 Kandasuda-cho, Chiyoda-ku, Tokyo Hitachi Systems Engineering Co., Ltd.

Claims (5)

[Claims] 1. A ventilated air heat source air conditioner connected to a room to be air-conditioned through a duct to integrally form an indoor unit, an outdoor unit, and a ventilation device, A ventilating air heat source air conditioner, wherein heat is recovered by a heat exchanger of the ventilator, and the air is further used as a heat source of an outdoor unit. 2. An air conditioner-equipped room connected to the room to be air-conditioned through an air duct and an air supply duct, the indoor unit having an indoor heat exchanger, and the outdoor unit having an outdoor heat exchanger. An integrated ventilation air heat source air conditioner in which a ventilation device having a ventilation heat exchanger is arranged in one housing, wherein the ventilation heat exchanger of the ventilation device includes the air circulation duct and A flow path for exchanging heat of a part of the conditioned air flowing through the air supply duct with a flow path of the outside air for ventilation; A ventilated air heat source air conditioner having a space region for mixing a part of the conditioned air that has passed through the exchanger with the exhaust gas. 3. The ventilation type air heat source air conditioner according to claim 2, wherein an exhaust outlet of a part of the conditioned air is opened toward a space region near the outdoor heat exchanger. Ventilation type air heat source air conditioner. 4. The ventilation type air heat source air conditioner according to claim 2, further comprising: an isolation means for shutting off the outdoor heat exchanger from outside air when the outdoor heat exchanger is defrosted in the heating operation. Features a ventilated air heat source air conditioner. 5. The ventilation type air heat source air conditioner according to claim 2, wherein the isolation means is a wind pressure shutter provided in an outside air suction part of an outdoor unit equivalent part. apparatus.