JPH11248284A - Air heat source type heat pump air conditioning facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air heat source type heat pump unit air conditioner having high COP. SOLUTION: The air heat source type heat pump air conditioning facility comprises no. 1A heat exchanger 51 for exchanging heat between outer air and/or return air and heat carrier, no. 1 heat exchanger 54 in first air supply passage SA1 for exchanging heat between heat carrier and indoor supply air, and no. 3B heat exchanger 56 in second air supply passage SA2 for exchanging heat between heat carrier and indoor supply air. The no 1 heat exchanger 54 can function as a condenser for exchanging heat between outer air and/or return air and heat carrier through humidifying/cooling water depending on the operating mode while the no. 3A, 3B heat exchanger 54, 56 can function selectively as a condenser or an evaporator depending on the operating mode. A heat pump circuit having simple structure and high COP can be realized using humiditied/cooled air as heat source.

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 heat source type heat pump type air conditioner for cooling and heating with a heat pump unit using outside air and / or return air as a heat source.

[0002]

2. Description of the Related Art In recent years, air-conditioning systems in office buildings and the like have changed from a centralized system to an individual decentralized system in response to an increase in cooling load due to intelligent building functions and a demand for more comfortable office environments. It is getting. Individual air conditioning systems such as unit-type heat pumps and multi-type air conditioners have been proposed as air conditioning equipment compatible with such individual distributed building air conditioning systems.

For example, a typical multi-type air conditioner is
Multiple indoor units are connected to one outdoor unit,
The system is configured such that operation such as operation stop and room temperature setting can be individually controlled for each indoor unit. Note that such multi-type air conditioners are excellent in individual operation control characteristics because of their excellent individual operation control characteristics, and can reduce the heat transfer power, which can significantly reduce energy consumption. Have been.

However, when installing such a multi-type air conditioner, the length and height difference of refrigerant pipes connecting the indoor unit and the outdoor unit vary depending on the installation location, and furthermore, the cooling capacity depends on the installation site. It is necessary to make forecasts, set piping systems, and properly adjust the oil injection amount.
Standardization of construction is required by prefabrication.

[0005] In the outdoor unit, in the system in which water is sprayed or sprayed on the condenser, it has been pointed out that the corrosion of the condenser is apt to proceed, and the life of the equipment is shortened.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional individual air conditioning system, and an object of the present invention is to humidify and cool air for a heat source in advance. Then, the heat is transferred to the heat pump unit and heat is exchanged, so that only the exhaust air below the amount of outside air taken in to meet the requirements of the Building Management Law is used as the heat source, and the conventional air heat source type using the latent heat of vaporization of the liquid is used. It has a higher COP than the heat pump unit air conditioner, and can cope with the partial load of the air conditioning space in a self-contained manner. It can also flexibly cope with the simultaneous load of cooling and heating. It is possible to operate the equipment, achieve standardization of equipment construction, and simultaneously achieve the individuality of thermal environment and air quality environment. To provide a good air heat source heat pump unit air conditioner.

[0007]

According to a first aspect of the present invention, a cooling and heating system is provided by a heat pump using outside air and / or return air as a heat source. 1A for exchanging heat between outside air and / or return air and a heat medium circulating in the heat pump.
A heat exchanger (51); a third A heat exchanger (54) interposed in the first air supply path (SA1) for exchanging heat between the heat medium and air supply to the room; A third B heat exchanger (56) interposed in the second air supply path (SA2) for exchanging heat between the heat medium and the air supply to the room, and the first A heat exchanger (51). ) Can function as a condenser for exchanging heat between the outside air and / or return air and the heat medium circulating in the heat pump through the humidifying cooling water according to the operation mode, and can perform the third A heat exchange. Vessel (54) and said third
An air heat source type heat pump air conditioner is provided, wherein the B heat exchanger (56) is configured to selectively function as a condenser or an evaporator according to an operation mode.

As will be apparent from the description of the embodiment below, the first to third heat exchangers may be configured as an air conditioning unit housed in one casing, or may be configured as a first heat exchanger. The exchanger may be arranged outside the machine in an air flow path communicating with the unit. Therefore, in this specification, both modes will be referred to as “air conditioning equipment”.

With this configuration, during the cooling operation, the high COP is achieved by using the air humidified and cooled by the first A heat exchanger (51) as a heat source and the third A heat exchanger (54) as an evaporator. With this, cold air can be supplied to the room. During the heating operation, the first A heat exchanger (5
Heating can be supplied to the room by using the return air or outside air that has passed through 1) while maintaining the air state as a heat source and the third A heat exchanger (54) as a condenser. Further, at the time of simultaneous cooling and heating operation, it is possible to simultaneously supply hot air and cold air by operating the third B heat exchanger (56) as an evaporator or a condenser.

Further, according to the second aspect, the first heat exchanger (51) includes a first heat exchanger for directly contacting the outside air and / or return air with the humidifying cooling water to exchange heat. A second heat exchanger for exchanging heat between the air passing through the first heat exchanger and the heat medium circulating in the heat pump circuit may be configured as an integrated unit.

According to this configuration, during the cooling operation, the air humidified and cooled by the first heat exchanger is used as a heat source.
The second heat exchanger functions as a condenser,
By making the heat exchanger (54) function as an evaporator, cold air can be supplied into the room with a high COP.
In the heating operation, the return air or outside air that has passed through the first heat exchanger while maintaining the air state is used as a heat source, the second heat exchanger functions as an evaporator, and the third A heat exchanger (54)
By functioning as a condenser, warm air can be supplied to the room.

[0012] Further, as described in claim 3, the first A
Return air (RA) from indoors as heat source for heat exchanger (51)
It is also possible to configure so as to use only the information. According to this configuration, since the exhaust gas from the room is used as the heat source, a self-contained heat pump unit air conditioner that does not need an apparent heat source can be configured.

Furthermore, if the first A heat exchanger (51) is configured as a gas-liquid direct contact type heat exchanger of a small cooling tower specification, it is very simple. A heat pump unit air conditioner having a high COP with a configuration can be provided.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A preferred embodiment of an air heat source type heat pump unit air conditioner (air conditioner) configured based on the present invention will be described in detail.

As shown in FIG. 1, this air heat source type heat pump air conditioner is installed in a first air supply path (SA1) having a first A heat exchanger 51 and a first air blower 53, and is provided indoors. A third A heat exchanger 54 for exchanging heat between the air supply and the heat medium of the heat pump circuit, and a second air supply path (SA2) having a second air supply blower 55 for supplying air to the room and a heat pump circuit A third B heat exchanger 56 for exchanging heat with the heat medium, a compressor 57, a four-way valve 58, and switching valves 59 and 6.
0 and 61 and an expansion valve 63.

The first A heat exchanger 51 is a small gas-liquid direct contact type heat exchanger with a cooling tower specification, and circulates cooling water by a circulation pump 52 and sprays humidified cooling water on a condenser. The first that can humidify and cool outside air
A heat exchanger function and a second heat exchanger function for exchanging heat between the heat medium circulating in the heat medium pipe of the heat pump circuit and the outside air passing through the first heat exchanger It is. As described above, the first A heat exchanger 51 has an increased capacity as a heat source of air by adding a first heat exchanger function as a humidifying cooling unit, and further has a second heat forming part of the heat pump unit. By integrally configuring the exchange function, it is possible to provide a high COP with a simpler configuration.

In the air heat source type heat pump unit air conditioner according to the present embodiment, a part 64 of the return air from the room taken in from the return air port (RA) is used as a heat source of the first A heat exchanger 51. The first and second
Desired air can be supplied indoors from the air supply path (SA1, SA2). In the illustrated example, air exhausted from the room to the outside is used as a heat source, and apparently no heat source is used. However, the present invention is not limited to such a structure. For example, it is possible to adopt a configuration substantially similar to that of the present invention and to use external air taken in from an external air intake (OA) as a heat source as shown in FIG.

The air-heat source type heat pump unit air conditioner constructed as described above has a four-way valve 58 and a switching valve 5.
The following operation can be performed by switching 9, 60, and 61 according to the operation mode.

(1) Cooling operation mode The circulating pump 52 is driven to spray water to the sixth heat exchanger 51, and the heat medium of the heat pump circuit is transferred from the compressor 57 to the four-way valve 58 to the first A heat source. Exchanger 51 → Switching valve 6
1 → expansion valve 63 → third A heat exchanger 54 → four-way valve 58 → compressor 57 in order to make the first A heat exchanger 51 function as a condenser and the third A heat exchanger 54 as an evaporator It is possible to configure a heat pump circuit for supplying cool air to the room from the first air supply path (SA1).

(2) Simultaneous cooling and heating operation (cooling operation mode) When a heating load is also required during cooling operation, each switching valve is switched so that the heat medium of the heat pump circuit is supplied from the compressor 57 to the four-way valve 58. → 1st A heat exchanger 51 → switching valve 59
→ 3B heat exchanger 56 → switching valve 60 → expansion valve 63 → 3rd
A heat exchanger 54 → four-way valve 58 → compressor 57 is sequentially circulated to make the first A heat exchanger 51 and the third B heat exchanger 56 function as a condenser, and the third A heat exchanger 54 functions as an evaporator. A heat pump circuit for causing the cool air from the first air supply path (SA1) to flow through the second air supply path (SA).
2) It is possible to supply warm air to the room, respectively.

(3) Heating operation mode During the heating operation, the circulation pump 52 is stopped, and no water is sprayed on the sixth heat exchanger 51. Then, the heat medium of the heat pump circuit is supplied to the compressor 57 → the four-way valve 58 → the third A heat exchanger 54 → the expansion valve 63 → the switching valve 61 → the first A heat exchanger 5
1 → four-way valve 58 → compressor 57 is sequentially circulated to make the third A heat exchanger 54 function as a condenser,
1 is configured as a heat pump circuit that functions as an evaporator, and hot air can be supplied to the room from the first air supply path (SA1).

(4) Simultaneous cooling and heating operation (heating operation mode) When a cooling load is also required during the heating operation, each switching valve is switched to transfer the heat medium of the heat pump circuit from the compressor 57 to the four-way valve 58. → 3A heat exchanger 54 → switching valve 60
→ 3B heat exchanger 56 → switching valve 59 → 1A heat exchanger 5
The heat pump circuit circulates sequentially from 1 → four-way valve 58 → compressor to make the first A heat exchanger 51 and the third B heat exchanger 56 function as an evaporator and make the third A heat exchanger 54 function as a condenser. , Hot air from the first air supply path (SA1) and cold air from the second air supply path (SA2).
It can be supplied indoors.

As described above, the air heat source type heat pump unit air conditioner according to the present embodiment has a simple configuration by switching the four-way valve 58 and the switching valves 59, 60, 61 according to the operation mode. With a high COP,
It is possible to flexibly respond to various air conditioning loads.

The air heat source type heat pump unit air conditioner according to the present embodiment omits the outside air intake (OA) and removes a part of the return air from the room supplied from the return air opening (RA). It is also possible to configure so as to use the first A heat exchanger as a feed heat source. According to such a configuration, it is possible to configure a self-contained heat pump unit air conditioner that apparently does not require a heat source. .

Although the preferred embodiment of the present invention has been described with reference to FIG. 1, the present invention is not limited to this embodiment. A person skilled in the art can make various changes and modifications within the scope of the technical idea described in the claims.
It is to be understood that they are within the scope of this invention. In particular, regarding the arrangement of the heat source piping, the humidifying cooling water piping, the arrangement of the heat exchangers, and the air paths, other than the above-described embodiment, those skilled in the art can conceive various changes and modifications. , It is understood that they are also included in the scope of the present invention.

[0026]

As described above, according to the present invention,
Since the air humidified and / or cooled by the humidification cooling means is used as a heat source, it is possible to provide an air heat source type heat pump unit air conditioner having a high COP. At that time, a first heat exchanger function capable of humidifying and cooling the outside air, and a heat exchange between the heat medium circulating in the heat medium pipe of the heat pump circuit and the outside air passing through the first heat exchanger. Integrated with the second heat exchanger function as a 1A heat exchanger,
By incorporating it in a heat pump circuit composed of the 3A heat exchanger and the 3B heat exchanger, the above effects can be achieved with a simpler device configuration.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a piping system and an air path of an air heat source type heat pump unit air conditioner configured based on the present invention.

[Explanation of symbols]

 51 1A heat exchanger 52 circulation pump 53 1st air supply fan 54 3A heat exchanger 55 2nd air supply fan 56 3B heat exchanger 57 compressor 58 four-way valve 59 switching valve 60 switching valve 61 switching Valve SA1 First air supply path SA2 First air supply path

Claims (4)

[Claims] 1. An air heat source type heat pump type air conditioner in which cooling and heating are performed by a heat pump using outside air and / or return air as a heat source: between outside air and / or return air and a heat medium circulating in the heat pump. A first A heat exchanger for heat exchange, a third A heat exchanger interposed in the first air supply path for heat exchange between the heat medium and air supply to the room, A third heat exchanger interposed in the air supply path for exchanging heat between the heat medium and the air supply to the room, wherein the first heat exchanger is humidified in accordance with an operation mode. The condenser can function as a condenser for exchanging heat between the outside air and / or return air via the cooling water and the heat medium circulating in the heat pump.
The air heat source type heat pump air conditioner, wherein the B heat exchanger is configured to selectively function as a condenser or an evaporator according to an operation mode. 2. The first heat exchanger includes a first heat exchanger for directly contacting outside air and / or return air with humidifying cooling water to exchange heat, and an air passing through the first heat exchanger. 2. The air-source heat pump type air conditioner according to claim 1, wherein a second heat exchanger for exchanging heat between the heat pump and a heat medium circulating in the heat pump circuit is integrated. . 3. The first A heat exchanger uses only return air from a room as a heat source.
The air heat source type heat pump air conditioner according to claim 1 or 2. 4. The air according to claim 1, wherein the first heat exchanger is a gas-liquid direct contact heat exchanger with a small cooling tower specification. Heat source type heat pump type air conditioner.