WO2018072586A1

WO2018072586A1 - Heat recovery device and air conditioning apparatus provided with same

Info

Publication number: WO2018072586A1
Application number: PCT/CN2017/102552
Authority: WO
Inventors: 侯坤鹏; 帅明月; 王向飞
Original assignee: 珠海格力电器股份有限公司
Priority date: 2016-10-19
Filing date: 2017-09-21
Publication date: 2018-04-26
Also published as: CN106288258B; CN106288258A

Abstract

A heat recovery device, comprising a supercooling coil pipe (1) and an overheating coil pipe (2), the supercooling coil pipe (1) and the overheating coil pipe (2) being connected by means of a connecting pipe (3), the position of the overheating coil pipe (2) being higher than the position of the supercooling coil pipe (1), and the heat recovery device being filled with refrigerant. When the heat recovery device is combined with a heat exchanger (4) of an air conditioning apparatus, the heat of high temperature fresh air converts liquid refrigerant in the supercooling coil pipe (1) into gaseous refrigerant, and the gaseous refrigerant flows via the connecting pipe (3) into the overheating coil pipe (2) that is positioned relatively higher; low temperature fresh air exiting the heat exchanger (4) can re-convert the gaseous refrigerant in the overheating coil pipe (2) into liquid refrigerant, and the liquid refrigerant flows under the action of gravity via the connecting pipe (3) into the supercooling coil pipe (1) that is positioned relatively lower; this manner of circulation can automatically implement recovery of heat or cold.

Description

Heat recovery device and air conditioner having the same

Technical field

The present invention relates to the field of air conditioning technology, and in particular to a heat recovery device and an air conditioning device therewith.

Background technique

When using air conditioners to adjust the indoor environment, it is not only required to achieve a comfortable temperature, but also to achieve a healthy and suitable humidity. It is generally believed that an environment with a relative humidity between 50% and 60% is an environment that is both healthy and comfortable, and too high or too low relative humidity can affect comfort. In order to achieve the purpose of air conditioning, the traditional combined air conditioners often use the traditional heating method (steam or electric heating) to increase the relative humidity of the air sent into the room in order to meet the dry bulb temperature and relative humidity set by the room. This often results in unnecessary waste of resources.

In the prior art, there is no air conditioning apparatus capable of recovering excess heat by utilizing its own structure to preheat the air and increase the relative humidity.

Summary of the invention

Based on the above-mentioned status quo, a main object of the present invention is to provide a heat recovery device capable of realizing heat or cooling recovery by utilizing its own structure when combined with a heat exchanger of an air conditioning apparatus, and reducing energy consumption of the air conditioning apparatus.

The above objectives are achieved by the following technical solutions:

A heat recovery device comprising a supercooling coil and a superheating coil, wherein the supercooling coil is connected to the hot coil through a connecting pipe, and the hot coil is positioned higher than the supercooling coil The position of the tube, wherein the heat recovery unit is filled with a refrigerant.

Preferably, the subcooling coil and the superheat coil are integrally parallel to each other.

Preferably, the supercooling coil, the hot coil and the connecting tube are integrally U-shaped.

Preferably, in the case where the subcooling coil and the hot coil are placed upright, the The position of the heat coil is higher than the position of the subcooling coil, and the connecting pipe is obliquely connected between the subcooling coil and the superheat coil.

Preferably, the connecting pipe comprises a plurality of pipes arranged side by side.

Another object of the present invention is to provide an air conditioning apparatus capable of realizing heat or cold recovery by its own structure, thereby reducing the energy consumption for processing fresh air, and replacing the conventional heating method to provide the relative humidity of the room.

To achieve this, the technical solutions adopted are as follows:

An air conditioning apparatus comprising a heat exchanger further comprising a heat recovery device as described above, wherein the heat exchanger is disposed between the subcooling coil and the superheat coil, and the subcooling The coil is located on the inlet side of the heat exchanger, and the hot coil is located on the outlet side of the heat exchanger.

Preferably, a damper assembly is further included, the damper assembly being configured to control a passage of a gas stream that exchanges heat with the heat exchanger such that the gas stream passes through the heat recovery unit or does not pass through the heat recovery unit.

Preferably, the damper assembly includes a first damper, a second damper, a third damper and a fourth damper, wherein the first damper is located outside the subcooling coil, the first The second damper is located outside the superheat coil, the third damper is located above the supercooling coil, and the fourth damper is located below the superheat coil.

Preferably, the damper assembly is configured as: a first damper and a second damper synchronizing switch, a third damper and a fourth damper synchronizing switch.

Preferably, the heat exchanger is a surface cooler.

Preferably, the air conditioning device is a combined air conditioning device.

When the heat recovery device of the present invention is combined with the heat exchanger of the air conditioning device, the heat of the high temperature fresh air converts the liquid refrigerant in the supercooled coil into a gaseous refrigerant, and the gaseous refrigerant flows to the higher temperature coil through the connecting pipe. The low-temperature fresh air from the heat exchanger can convert the gaseous refrigerant in the superheat coil into a liquid refrigerant, and the liquid refrigerant flows to the subcooled coil with a lower position through the connecting pipe under the action of gravity, so that the circulation can be automatically realized. Recycling of heat or cold.

At the same time, the heat recovery device of the invention utilizes the function of gravity reasonably, and realizes that the refrigerant freely circulates without external power in the heat recovery device, and is convenient and intelligent. Moreover, the heat recovery device of the present invention realizes the gas-liquid two states in the heat recovery device by using the principle of thermal expansion and contraction, and is free according to the environment. The conversion, which is not interfered by human factors, is completely determined by the environment, and the transfer of heat or cold is continuously realized.

Since the air conditioner of the present invention is provided with the heat recovery device of the present invention, on the one hand, it is possible to preheat (cold) fresh air to reduce the energy consumption for processing fresh air, reduce the load of the air cooler, and reduce the number of rows of the air cooler tubes, thereby reducing the entire number. The operating energy consumption of the system, on the other hand, can overheat the air that will be sent into the room to increase the relative humidity, which can replace the traditional overheating method and effectively save energy.

DRAWINGS

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a heat recovery device and an air conditioning apparatus according to the present invention will be described with reference to the accompanying drawings. In the picture:

1 is a schematic view showing the outer structure of a heat recovery device according to a preferred embodiment of the present invention;

Figure 2 is a schematic view as seen along the arrow H in Figure 1;

Figure 3 is a schematic view as seen along the arrow V in Figure 1;

4 is a schematic diagram of the principle of an air conditioning apparatus according to a preferred embodiment of the present invention;

5 is a schematic view showing the operation principle of a heat recovery device in an air conditioning apparatus according to a preferred embodiment of the present invention;

6 is a schematic diagram of the principle of an air conditioning apparatus according to another preferred embodiment of the present invention;

Figure 7 is a schematic view showing the air processing flow of the air conditioning apparatus of the present invention;

FIG. 8 is a schematic diagram of an air treatment process of a prior art air conditioning apparatus.

detailed description

The first aspect of the present invention provides a heat recovery device in heat exchange with an air conditioner, based on the fact that a conventional combined air conditioner adopts a conventional heating method in pursuit of dry bulb temperature and relative humidity, resulting in high energy consumption. When combined, the device can realize heat or cold recovery by its own structure, thereby reducing the energy consumption of the air conditioner.

As shown in FIG. 1-3, the heat recovery device of the present invention comprises a supercooling coil 1 and a superheating coil 2, and the supercooling coil 1 and the superheating coil 2 are connected by a connecting pipe 3, The position of the superheat coil 2 is higher than the position of the subcooling coil 1, wherein the heat recovery unit is filled with a refrigerant, and the refrigerant does not fill the heat recovery unit when it is in a liquid state.

The heat recovery device of the present invention itself constitutes a closed system and is filled with a certain amount in the system. The refrigerant enables the state change between the gas and liquid phases to occur when the refrigerant receives external heat or cold. For example, when the heat is received, the liquid refrigerant is converted into a gaseous refrigerant, and when the cold is received, The gaseous refrigerant is converted into a liquid refrigerant. Since the position of the superheating coil 2 is higher than the position of the supercooling coil 1, when the refrigerant in the supercooling coil 1 receives heat, the liquid refrigerant therein is converted into a gaseous refrigerant and automatically flows to the superheating coil 2 When the refrigerant in the superheating coil 2 receives the cold amount, the gaseous refrigerant therein is converted into a liquid refrigerant and automatically flows into the supercooling coil 1 under the action of gravity, thereby automatically achieving heat or cooling. Handling transfer to achieve heat or cold recovery.

In particular, when the heat recovery device of the present invention is installed in an air conditioning device, such as a periphery of a heat exchanger installed in a combined air conditioning device, taking the summer cooling operation as an example, the high temperature fresh air is first passed through the cold coil. After being cold, it is cooled and dehumidified by the heat exchanger, and then passes through the heat exchanger and then passes through the superheat coil to be warmed up to reach a suitable temperature and humidity. In this process, the heat of the high temperature fresh air converts the liquid refrigerant in the supercooled coil into a gaseous refrigerant, and the low temperature fresh air from the heat exchanger converts the gaseous refrigerant in the superheat coil into a liquid refrigerant, and thus circulates. Automatic recovery of heat or cold is possible.

Preferably, the subcooling coil 1 and the superheat coil 2 are parallel to each other as shown in FIGS. 2 and 3, and this arrangement can reduce the space occupation of the heat recovery unit. The supercooling coil 1 and the superheating coil 2 can be regarded as two-dimensional members, similar to the two flat members, and therefore, in the present invention, being entirely parallel to each other means that the two flat members are parallel to each other. For example, when mounting in an air conditioner, the subcooling coil 1 and the superheat coil 2 may be installed in parallel with the heat exchanger, for example, as shown in FIG. 4, thereby reducing the volume of the air conditioner.

Preferably, as shown in FIGS. 1 and 3, the supercooling coil 1, the superheat coil 2, and the connecting tube 3 are integrally arranged in a U shape. That is, the connecting pipe 3 is provided at the same end of the supercooling coil 1 and the superheat coil 2. This configuration ensures that the connecting pipe 3 is connected to the cold coil 1 and the superheat coil 2 in the shortest path.

Preferably, in the case where the subcooling coil 1 and the superheat coil 2 are placed upright, the position of the superheat coil 2 is higher than the position of the subcooling coil 1, which makes the connecting tube 3 is obliquely connected between the subcooling coil 1 and the superheat coil 2. The supercooling coil 1 and the superheating coil 2 are generally a plate-like two-dimensional structure, and the vertical placement means that the plate-shaped two-dimensional structure is in a vertical plane, and the projected area on the horizontal plane is the smallest.

The connecting tube 3 preferably comprises a straight tube arranged directly obliquely.

Preferably, the connecting pipe 3 comprises a plurality of pipes arranged side by side. These pipes are arranged side by side, for example, in the height direction, so that the area of the communication passage between the supercooling coil 1 and the superheat coil 2 can be enlarged, and the refrigerant intercommunication between the supercooling coil 1 and the superheat coil 2 is facilitated, for example, The gaseous refrigerant can reach the superheated coil 2 by taking the pipeline with a higher position, and the liquid refrigerant can go to the subcooling coil 1 by the pipeline with the lower position, and does not affect each other. The heat recovery device of the invention utilizes the function of gravity reasonably, realizes free circulation of the refrigerant in the heat recovery device without external power, and is convenient and intelligent. At the same time, the heat recovery device of the present invention realizes that the two types of gas and liquid in the heat recovery device are freely converted according to the environment by utilizing the principle of thermal expansion and contraction, and are free from human factors, completely determined by the environment, and continuously realize heat or Transfer of cold load.

On the basis of the above work, another aspect of the present invention provides an air conditioning apparatus, preferably a combined air conditioning apparatus, comprising the heat recovery apparatus of the present invention such that it can realize heat or cold recovery by its own structure, This reduces the energy consumption of fresh air and replaces the traditional heating method to provide the relative humidity of the room.

As shown in FIG. 4, the air conditioning apparatus of the present invention includes a heat exchanger 4, and further includes a heat recovery device as described above in the present invention, wherein the heat exchanger 4 is disposed in the supercooling coil 1 and the overheating Between the coils 2, and the subcooling coil 1 is located on the high temperature side, and the superheat coil 2 is located on the low temperature side. In Fig. 4, the left side is the high temperature side and the right side is the low temperature side. The arrangement shown in the figure is suitable for the summer cooling operation mode, in which the flow direction of the air is from the left side to the right side, as indicated by the arrow in the figure, that is, the high temperature air (new air) passes through the cold coil 1 first, after which After passing through the heat exchanger 4, it finally passes through the superheat coil 3.

The operation principle of the heat recovery device of the present invention in an air conditioner is as shown in FIG. When high-temperature air (for example, outdoor outdoor air) flows through the supercooling coil 1, the liquid refrigerant in the supercooling coil 1 absorbs heat of the high-temperature air and evaporates, and is converted into a gaseous state by the liquid state, at the end of the supercooling coil 1 The liquid refrigerant is substantially completely vaporized, and the increased partial pressure of steam forces the steam to flow to the higher temperature coil 2 at a higher position. The process of evaporating the refrigerant in the supercooling coil 1 simultaneously achieves pre-cooling of the high-temperature air, and reduces the temperature of the high-temperature air by a certain amount. Thereafter, the pre-cooled air enters the heat exchanger 4 for cooling and/or dehumidification. The pre-cooling action also contributes to reducing the load on the heat exchanger 4. The air emerging from the heat exchanger 4 then passes through the superheat coil 2. On the side of the superheat coil 2, the temperature of the air immediately after being cooled by the heat exchanger 4 is low, which can be called cold air, and the cold air absorbs the heat of the refrigerant in the superheat coil 2. When it is overheated and the temperature rises, at the same time, the gaseous refrigerant in the superheating coil 2 is condensed into a liquid, and flows to the supercooling coil 1 under the action of gravity to start the next cycle. In this way, it is possible to circulate continuously and realize the continuous transfer of heat.

It can be seen that the air conditioner of the present invention is provided with the heat recovery device of the present invention, on the one hand, the load of the heat exchanger can be reduced, thereby reducing the energy consumption for processing fresh air, and on the other hand, the air from the heat exchanger can be superheated by the fresh air heat. To the target temperature and relative humidity, thus replacing the traditional heating method, reducing the energy consumption of the air conditioning unit.

Preferably, the air conditioning apparatus of the present invention further includes a damper assembly configured to control a passage of the airflow that exchanges heat with the heat exchanger 4 such that the airflow passes through the heat recovery unit or does not pass through The heat recovery unit. By adjusting the damper assembly to change the direction of the air, it is easy to adapt to the different needs of the cooling season (summer) and the transition season (spring and autumn). For example, during the cooling season, air can be passed through the heat recovery unit through the damper assembly, and during the transitional season, the air valve assembly can be used to prevent air from passing through the heat recovery unit because the heat recovery function is not required. Disconnect the heat recovery flow path to reduce the air resistance, thereby reducing the fan energy consumption of the air conditioner and saving energy (up to about 10%).

Preferably, in the air conditioning apparatus, the heat exchanger 4, the subcooling coil 1 and the superheat coil 2 are both placed upright, and the position of the subcooling coil 1 of the heat recovery unit is lower than that of the superheat coil 2 location. Therefore, as shown in FIG. 4, when the heat recovery device is installed in the casing 5 of the air conditioner, there is a large gap in the casing 5 above the subcooling coil 1, and similarly, it is overheated in the casing 5. There is also a large gap below the coil 2. If the airflow passes through the gap above the subcooling coil 1 into the heat exchanger 4 and then flows out through the gap below the hot coil 2, the airflow first passes through the cold coil 1 and enters the heat exchanger 4 and then flows out through the hot coil 2. In the case, it is obvious that the air resistance is small, and therefore, the load of the fan of the air conditioner is correspondingly small. In view of this, the present invention provides a damper assembly in an air conditioning apparatus if the damper assembly does not block the subcooling coil 1 and the overheating coil 2 (unobstructed means that air can pass) , that is, equivalent to opening the corresponding passage of the outer side of the cold coil and the overheating coil, while shielding the gap (the occlusion means that the air cannot pass, that is, corresponding to closing the corresponding passage at the gap), then the air flow Will only pass through the heat recovery unit; if the damper assembly blocks the subcooling coil 1 and the hot coil 2 while not blocking the gap, then the air flow will not pass the heat The recycler can only pass through the gap.

Preferably, as shown in FIG. 4, the damper assembly includes a first damper 6, a second damper 7, a third damper 8, and a fourth damper 9, wherein the first damper 6 is located at The outer side of the cold coil 1 is located, the second damper 7 is located outside the hot coil 2, the third damper 8 is located above the supercooling coil 1, and the fourth damper 9 is located below the hot coil 2 . That is, the first damper 6 is used to open or close the air flow path through the subcooling coil 1, the second damper 7 is used to open or close the air flow path through the superheat coil 2, and the third damper 8 is used to open Or, the air flow path passing through the gap above the cold coil 1 is closed, and the fourth damper 9 is used to open or close the air flow path through the gap below the hot coil 2.

In the present invention, the outer sides of the supercooling coil and the superheat coil are defined such that, for one coil, the side facing the other coil is the inner side, and the side facing away from the other coil is the outer side. In particular, for any U-shaped arm of the U-shaped structure, the two U-shaped arms are between the inside and the other side is the outside.

In order to reduce the space occupation, each damper is preferably of a louver type structure.

When both the first damper 6 and the second damper 7 are opened, and both the third damper 8 and the fourth damper 9 are closed, the air passes through the heat recovery device to perform a heat recovery function. Conversely, the air does not pass through the heat recovery unit and the heat recovery function is turned off.

Preferably, the damper assembly is arranged such that the first damper 6 and the second damper 7 are synchronously switched, and the third damper 8 and the fourth damper 9 are synchronously switched. For example, the air conditioning device includes a controller (not shown), and each damper is switched by, for example, an actuator such as a motor, and the controller can synchronously control the motor that switches the first damper and the motor that switches the second damper 7 to switch The motor of the third damper 8 and the motor of the switch fourth damper 9 are synchronously controlled to ensure that the heat recovery unit participates or does not participate in the air treatment of the air conditioner.

It is easy to understand that air can neither exert heat if it passes through the coil of the heat recovery unit (for example, a supercooled coil or a superheated coil) on one side and the other side passes through the gap above or below the corresponding coil. The recycling function, which also causes the fan load to increase in vain, is not recommended.

Alternatively, as shown in FIG. 6, the damper assembly may further include a first valve plate 10 and a second valve plate 11, wherein the first valve plate 10 is pivotally mounted on the subcooling coil The outer side of the first valve plate 10 is selectively blocked on the outer side of the subcooling coil 1 or above the subcooling coil 1; the second valve plate 11 is pivotally mounted on The outer side of the overheating coil 2 makes The second valve plate 11 is alternatively blocked outside the hot coil 2 or below the hot coil 2 .

Compared to the damper assembly of Fig. 4, the control mechanism of the damper assembly of Fig. 6 is relatively simple, for example, the number of drive motors can be reduced, but at the same time there is also a problem of a slightly larger space occupation.

Preferably, the heat exchanger 4 in the air conditioning apparatus of the present invention is a surface cooler, which cools the air, for example, by means of an external heat source or a high temperature medium (such as hot water) provided by a cold source or a low temperature medium (such as cold water). Or the effect of warming up. This structure is particularly suitable for a combined air conditioning unit.

It is easily conceivable that when the air conditioning apparatus of the present invention is a combined air conditioning apparatus, a humidifying apparatus, a filtering apparatus, a fan, and the like may be included as needed to provide a comfortable and clean environment for the room.

The advantages of the air conditioning apparatus of the present invention will be described below with reference to Figs. 7 and 8.

In Fig. 7 and Fig. 8, dt1 is the dry bulb temperature, wt1 is the wet bulb temperature, and d is the wet weight.

For relative humidity, h1 is the enthalpy value, these parameters can more fully characterize the air state. The parameter values in the figures are only examples for convenience of explanation.

Assume that the outdoor air state is A and the room setting state is D (where each parameter is the target set value).

If the air heat recovery device does not have the heat recovery device of the present invention, as shown in FIG. 8, the air of the state A changes to the state E after passing through the heat exchanger (such as the surface cooler), and in this case, the parameters of the state E are dried. The ball temperature dt1 is 13 ° C, lower than the set temperature of 18 ° C, the relative humidity is 90%, higher than the set relative humidity of 65.1%, so the heating temperature treatment is required, and the relative humidity is also reduced to the target relative humidity, reaching the state D . In order to achieve heating and heating, it is necessary to add a heating step (conventional heating method, such as steam or electric heating), which not only introduces redundant equipment, but also greatly increases energy consumption.

Whereas, if the heat recovery device of the present invention is used in the air conditioner (the air conditioner may be referred to as a heat recovery combined air conditioner), the outdoor high temperature air in the state A (while referring to FIG. 4, that is, the air state before passing through the cold coil 1) The supercooling coil 1 passing through the heat recovery device is precooled to reach the state B (the state of the air between the supercooling coil 1 and the heat exchanger 4 in Fig. 4), at which time the dry bulb temperature dt1 is lowered. 5 ° C, reaching 23 ° C; subsequently, the air of state B is changed to state C after the heat exchanger (such as the surface cooler) (the state of the air between the heat exchanger 4 and the superheat coil 2 in Fig. 4) At this time, the dry bulb temperature dt1 is 13 ° C, and the wet bulb temperature wt1 is 12 ° C, both lower than the set value; thereafter, The air of state C passes through the hot coil 2 of the heat recovery device. After being overheated, the dry bulb temperature and the wet bulb temperature rise, so that the target state D can be achieved without adding other heating links (Fig. 4, the superheat coil 2 At the same time, since the fresh air of the state A is pre-cooled to the state B, the load of the heat exchanger 4 is also lowered. It can be seen that the air conditioning device of the present invention realizes energy recycling due to its own structure, thereby reducing the operating cost of the entire system.

In summary, the air conditioner of the present invention is provided with the heat recovery device of the present invention, and can effectively utilize the heat (cold) energy in the air conditioning system to preheat (cold) fresh air to reduce the energy consumption for processing fresh air, and reduce the meter. The cold load reduces the number of rows of the cooler tube, thereby reducing the operating energy consumption of the entire system. At the same time, it can also overheat the air that will be sent into the room to increase the relative humidity, which can replace the traditional overheating method and save energy.

In particular, the combined air conditioner of the present invention saves energy compared to the conventional combined air conditioner: (1) pre-cooling fresh air, superheating cold air, maximizing internal heat utilization rate; (2) preheating cold air, that is, reducing The air enthalpy difference before and after the air cooler reduces the load of the air cooler, can reduce the number of air coolers, the water flow to the air cooler, the pipe diameter of the pipeline system is also relatively reduced, and the pump power is correspondingly reduced. From the perspective of the entire air conditioning system, the investment cost and operating cost of the whole system are reduced; (3) The wind valve component can be configured to control the wind direction, and the heat recovery device can be selected according to different situations, and the heat recovery device can be minimized when not in use. Air resistance, reduce the energy consumption of the fan; (4) Using the principle of thermal expansion and contraction and gravity to make the heat recovery device simple and intelligent, without excessive human intervention, the factors affecting its operation are only the ambient temperature and stability. High accuracy.

It will be readily understood by those skilled in the art that the above various preferred embodiments can be freely combined and superimposed without conflict.

The above-described embodiments are to be considered as illustrative and not restrictive. Modifications or substitutions are intended to be included within the scope of the appended claims.

Claims

A heat recovery device comprising: a supercooling coil and a superheating coil, wherein the supercooling coil is connected to the superheated coil through a connecting pipe, and the position of the superheated coil is higher than The position of the supercooled coil, wherein the heat recovery unit is filled with a refrigerant.
The heat recovery device according to claim 1, wherein said supercooling coil and said superheat coil are integrally parallel to each other.
The heat recovery device according to claim 1, wherein said supercooling coil, said superheat coil, and said connecting tube are integrally U-shaped.
A heat recovery device according to any one of claims 1 to 3, wherein said superheated coil is positioned higher than said supercooled coil and said superheated coil are placed upright The position of the cold coil, the connecting pipe being obliquely connected between the subcooling coil and the superheat coil.
A heat recovery device according to any one of claims 1 to 3, wherein the connecting pipe comprises a plurality of pipes arranged side by side.
An air conditioning apparatus comprising a heat exchanger, further comprising a heat recovery device according to any one of claims 1 to 5, wherein said heat exchanger is disposed on said subcooling coil and said overheating Between the coils, and the subcooling coil is located on the inlet side of the heat exchanger, and the superheat coil is located on the outlet side of the heat exchanger.
The air conditioning apparatus according to claim 6, further comprising a damper assembly configured to control a passage of the airflow that exchanges heat with said heat exchanger such that said airflow passes said heat The recycler may or may not pass through the heat recovery unit.
The air conditioning apparatus according to claim 7, wherein said damper assembly comprises a first damper, a second damper, a third damper, and a fourth damper, wherein the first damper is located outside of the subcooling coil, and the second damper is located at the superheat coil On the outside, the third damper is located above the subcooling coil, and the fourth damper is located below the superheat coil.
The air conditioning apparatus according to claim 8, wherein said damper assembly is provided with: a first damper and a second damper synchronizing switch, a third damper and a fourth damper synchronizing switch.
An air conditioning apparatus according to any one of claims 6-9, wherein said heat exchanger is a surface cooler.
An air conditioning apparatus according to any one of claims 6-9, wherein said air conditioning apparatus is a combined air conditioning apparatus.