CN103075764B - Double-cold source dehumidification air-conditioning unit - Google Patents

Abstract

A dual-cooling source dehumidification air-conditioning unit, including an air-conditioning unit housing, in which a compressor, a first condenser, a second condenser, a throttling device, an evaporator, a fresh air inlet, a return air inlet, Filter, air outlet, chilled water supply and return pipe, surface cooler; the compressor, the first condenser, the second condenser, the throttling device and the evaporator are sequentially connected through copper pipes to form the self-cooling source of the air conditioning unit system. The present invention has the following advantages: (1) The present invention has its own independent cold source system, and the central air-conditioning cold source system stops working in transitional seasons. When the air-conditioning system is in fresh air and energy-saving operation, it can use its own cold source to supply air to the air-conditioning unit. Dehumidification treatment avoids the phenomenon of indoor humidity and mold; (2) Using the air conditioning unit of the present invention, when the fresh air is running in the transition season, the temperature of the fresh air sent out is moderate, ensuring the comfort of the indoor temperature in the transition season.

Description

Dual cold source dehumidification air conditioning unit

technical field

The invention belongs to the field of refrigeration and air-conditioning equipment, and in particular relates to equipment for cooling and dehumidifying air.

Background technique

With the increase of building scale, the application of central air-conditioning system is more common. However, in the transition season, the operation efficiency of the central air-conditioning system is low. In order to save energy, the mode of fresh air operation is often adopted in the transition season. When the fresh air is running, the chilled water system of the air conditioner stops running and does not provide cooling for the air conditioning unit. The air conditioning unit cannot perform heat and humidity treatment on the outdoor fresh air, and the air conditioning unit directly sends the outdoor fresh air into the room.

Due to the transition season, especially the "returning to the south" season at the turn of spring and summer in the southern region and the "huangmeitian" season in the Yangtze River Basin, the outdoor air humidity is relatively high. When the air conditioning system is running with fresh air, it cannot dehumidify because there is no chilled water supply. To deal with it, sending humid outdoor air directly into the room will form a harsh humid environment indoors, which will seriously affect the quality of life and work of indoor personnel, and may cause mold and deterioration of indoor items. In addition, even if the chiller is turned on in the transitional season to provide cold water to the air-conditioning unit for dehumidification, the air-conditioning units in the southern region generally do not have the reheating function. If it is too low, there is no cooling load in the room, and the cold air after dehumidification will be sent into the room, which will make the indoor temperature too low and affect the thermal comfort of the room.

Contents of the invention

The object of the present invention is to provide a kind of double cooling source dehumidification air-conditioning unit, this air-conditioning unit has its own cold source system, can adopt the cold source of the centralized air-conditioning cold source system to carry out air-conditioning treatment to the air in the air-conditioning season like ordinary air-conditioning units; In the transitional season, the self-cooling source system of the air-conditioning unit can be used to dehumidify the air, without the need for an external centralized air-conditioning cold source.

The purpose of the present invention is to take the following technical solutions to achieve:

A dual-cooling source dehumidification air-conditioning unit, including an air-conditioning unit shell, characterized in that: a compressor, a first condenser, a second condenser, a throttling device, an evaporator, a fresh air inlet, Return air inlet, filter, air outlet, chilled water supply and return pipe, surface cooler; the compressor, the first condenser, the second condenser, the throttling device and the evaporator are sequentially connected through copper pipes to form an air conditioning unit Its own cold source system; the surface cooler is connected to the external central air-conditioning cold source system through the chilled water supply and return pipe; the filter is set at the fresh air inlet and return air inlet.

As an improvement of the present invention, the fresh air inlet is provided with a fresh air valve; the return air inlet is provided with a return air valve; the air outlet is provided with a blower; the independent refrigeration system of the air conditioning unit also includes a heat dissipation fan, and the heat dissipation The blower fan is installed on the first condenser, and is used for enhancing the heat dissipation of the first condenser.

The refrigerant flow direction of the self-cooling source system of the air conditioning unit is as follows: the refrigerant enters the first condenser after being compressed by the compressor, then enters the second condenser, enters the evaporator after being throttled by the throttling device, and then returns to the compressor The low-pressure end completes a cycle and forms the independent cold source system of the air conditioning unit, which is used to dehumidify the fresh air when there is no external cold source. The processing process is that the outdoor fresh air is cooled and dehumidified by the evaporator, and then passed through the second condenser Equal humidity heating is carried out, and the excess heat is discharged by the first condenser, so that the fresh air sent into the room during the transitional season is dry and the temperature is appropriate.

The surface cooler is connected to the central air-conditioning cold source system of the building, and uses the cooling capacity of the central air-conditioning cold source system in the air-conditioning season to cool down the air supplied by the air-conditioning unit.

The dual cold source dehumidification air conditioner unit can also be used to dehumidify the return air of the air conditioner. In the transitional season, when the indoor humidity is high or there is a large humidity source in the room, the new return air valve can be adjusted to reduce the proportion of fresh air, or even turn off the air. The fresh air is cut off, and only the indoor return air is dehumidified, thereby enhancing the dehumidification effect.

Compared with common air-conditioning units, the present invention has the following advantages:

(1) The present invention has its own independent cold source system. In the transitional season, the centralized air-conditioning cold source system stops working. When the air-conditioning system runs with fresh air and saves energy, it can use its own cold source to dehumidify the air supply of the air-conditioning unit to realize the air-conditioning system. At the same time of energy-saving operation, ensure that the air sent into the room is dry to avoid the phenomenon of indoor humidity and mold;

(2) Using the air-conditioning unit of the present invention, when the fresh air is running in the transitional season, the temperature of the fresh air sent out is moderate, ensuring the comfort of the indoor temperature in the transitional season.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the operation of the refrigerant of the present invention.

Detailed ways

The double-cooling source dehumidification air-conditioning unit shown in Figure 1 includes an air-conditioning unit casing 6, and a compressor 1, a first condenser 2, a second condenser 3, a throttling device 4, an evaporation Device 5, fresh air inlet 7, return air inlet 9, filter 11, air outlet 13, chilled water supply and return pipe 14, surface cooler 15. The compressor 1, the first condenser 2, the second condenser 3, the throttling device 4 and the evaporator 5 are sequentially connected through copper pipes to form the self-cooling system of the air conditioning unit; the surface cooler 15 is supplied and returned through the chilled water pipe 14 Connect the external centralized air-conditioning cold source system; the filter 11 is set at the fresh air inlet 7 and the return air inlet 9; the fresh air inlet 7 is provided with a fresh air valve 8; the return air inlet 9 is provided with a return air valve 10; the air outlet 13 is provided with a blower 12 The independent refrigeration system of the air-conditioning unit also includes a cooling fan 16, and the cooling fan 16 is installed on the first condenser 2 for enhancing the heat dissipation of the first condenser 2.

The refrigerant flow direction of the self-cooling source system of the air-conditioning unit in this embodiment is shown in Figure 2. After being compressed by the compressor 1, the refrigerant enters the first condenser 2 and then enters the second condenser 3. After being throttled by the throttling device 4 Enter the evaporator 5, and then return to the low-pressure end of the compressor 1 to complete a cycle.

The second condenser 3 in this embodiment is used to heat the dehumidified fresh air, and the first condenser 2 is used to discharge excess heat.

The working principle of the present invention is:

In the air-conditioning season, the self-cooling source system of the air-conditioning unit does not work, and the surface cooler 15 uses an external centralized air-conditioning cold source system to cool the air-conditioning air supply. After the return air port 9 enters the air conditioning unit for mixing, it is filtered by the filter 11 for dust removal, and then the surface cooler 15 is used for cooling and cooling treatment. When it flows through the evaporator 5 and the second condenser 3, no treatment is performed, and finally it is sent into the room by the blower 12. .

In wet transitional seasons, such as the "returning to the south" season in the southern region and the "Huangmeitian" season in the Jianghuai River Basin, the air-conditioning unit operates with fresh air to save energy. The surface cooler 15 has no external centralized air-conditioning cold source supply and stops working. The return air valve 10 is closed, and the self-cooling source system of the air conditioning unit works to dehumidify the fresh air. Its working process is: the outdoor fresh air enters the air conditioning unit from the fresh air inlet 7, passes through the filter 11 for dust removal and filtration, passes through the stopped surface cooler 15, cools and dehumidifies through the evaporator 5, heats up the second condenser 3, and finally is blown by the blower 12 into the chamber. The excess heat of the self-cooling source system of the air conditioning unit is discharged by the first condenser 2 .

In the dry transitional season, such as autumn, the outdoor air is dry and the temperature is moderate, so there is no need for heat and humidity treatment of fresh air. At this time, the surface cooler 15 of the air-conditioning unit and its own cold source system all stop working. The outdoor fresh air enters the air conditioning unit from the fresh air inlet 7, is filtered through the filter 11, then passes through the stopped surface cooler 15, evaporator 5 and the second condenser 3, and is sent into the room by the air blower 12.

In the transitional season when the room is very humid or there is a large humidity source in the room, the air conditioner unit can operate with full return air, that is, the fresh air valve 8 of the air conditioner unit is closed, and the indoor return air enters the air conditioner unit from the return air outlet 9, and is filtered by the filter 11 for dust removal. Through the surface cooler 15 that has stopped working, it is cooled and dehumidified by the evaporator 5, and after the second condenser 3 heats up, it is finally sent into the room by the air blower 12. The excess heat of the refrigeration system is discharged by the first condenser 2 .

Claims (1)

1. A dual cooling source dehumidification air-conditioning unit, comprising an air-conditioning unit housing (6), characterized in that: the air-conditioning unit housing (6) is provided with a compressor (1), a first condenser (2), Second condenser (3), throttling device (4), evaporator (5), fresh air inlet (7), return air inlet (9), filter (11), air outlet (13), chilled water supply and return Water pipe (14), surface cooler (15); the compressor (1), first condenser (2), second condenser (3), throttling device (4) and evaporator (5) pass through in sequence The copper pipes are connected to form the self-cooling source system of the air conditioning unit; the surface cooler (15) is connected to the external centralized air-conditioning cold source system through the chilled water supply and return pipe (14); the filter (11) is set at the fresh air inlet ( 7) and the return air inlet (9); when the dual cooling source dehumidification air-conditioning unit is in the air-conditioning season, its own cooling source system does not work, and the surface cooler (15) uses the cooling capacity of the centralized air-conditioning cold source system. The air supply is cooled and cooled; when the dual cold source dehumidification air conditioner unit is in a humid transitional season, the surface cooler (15) stops working, and its own cold source system is used to dehumidify the air supply of the air conditioner unit; the dual cold source When the dehumidification air-conditioning unit is in the dry transitional season, the surface cooler (15) and its own cold source system are not working, and the blower (12) directly sends the fresh air processed by the filter (11) into the room. 2 . The double cooling source dehumidification air-conditioning unit according to claim 1, characterized in that: the fresh air inlet (7) is provided with a fresh air valve (8). 3 . The double cooling source dehumidification air-conditioning unit according to claim 1, characterized in that: the return air inlet (9) is provided with a return air valve (10). 4 . The double cold source dehumidification air conditioning unit according to claim 1, characterized in that: the air outlet (13) is provided with a blower (12). 5 . According to claim 2, 3 or 4, the dual-cooling source dehumidification air-conditioning unit is characterized in that: the independent refrigeration system of the air-conditioning unit also includes a heat dissipation fan (16), and the heat dissipation fan (16) is set at the first condensing on the device (2).