CN101261024A - Air Conditioning Unit Device and Air Treatment Method for Heat and Humidity Sectional Treatment - Google Patents

Abstract

The air treatment method of the air conditioning unit is divided into two parts, among which: the air treatment method of the heat and humidity section treatment is: after the indoor return air is mixed with the fresh air, it first passes through the first surface cooler (3) and high-temperature chilled water Heat exchange, cooling down to the dew point temperature after isohumidity, removing most of the sensible heat load, and then entering the second surface cooler (4); Condensed water is generated to remove the humidity load; the air after cooling and dehumidification is processed to the air supply state point by the heater (5) and humidifier (6), and finally sent to the air-conditioned room after being pressurized by the fan (7); The method adopted is: the refrigerant in the first chiller unit enters the condenser (12) to condense after being compressed and discharged by the first compressor (11), and then passes through the first liquid storage tank (13) and the first filter (14) After being throttled and depressurized by the first electronic expansion valve (15), it enters the first evaporator (10) to exchange heat with chilled water.

Description

Air Conditioning Unit Device and Air Treatment Method for Heat and Humidity Sectional Treatment

technical field

The invention relates to an air treatment method for segmental treatment of air-conditioning loads and a device for realizing the method, and belongs to the technical field of design and manufacture of refrigeration and air-conditioning systems.

Background technique

The air conditioning load can be divided into sensible heat load and humidity load (latent heat load). The humidity load treatment methods in the air treatment process mainly include cooling and dehumidification, solution dehumidification, adsorption dehumidification, etc. Restricted by various factors, cooling and dehumidification is still the most commonly used method to deal with the humidity load of air conditioners.

The method of cooling and dehumidification is to use cold water at a lower temperature to perform one-time cooling and dehumidification treatment on the air, and process it to the required saturation state, and then heat the air to the air supply state by heating. In this way, the sensible heat load and humidity load in the air-conditioning load are treated with low-temperature chilled water, and in order to meet the needs of dehumidification, the temperature of the chilled water must be low enough (about 7°C), resulting in the evaporation temperature of the chiller It cannot be improved, the energy efficiency of the air conditioning unit is relatively low, the economy is poor, and the unit consumes a lot of energy.

Contents of the invention

Technical problem: The purpose of the present invention is to solve the problems of low evaporation temperature and difficulty in improving the energy efficiency ratio of refrigeration units existing in the existing one-time cooling and dehumidification air-conditioning device, and to provide a heat-humidifier that realizes segmental processing of air-conditioning loads and is energy-saving and efficient. Air-conditioning unit device for stage treatment and air treatment method thereof.

Technical solution: The air-conditioning unit device for heat and humidity staged treatment in the present invention includes an air treatment part and a water chiller part. The air processing part is composed of a first surface cooler, a second surface cooler, a heater, a humidifier, and a fan connected in sequence. The chiller part includes two parts, the first chiller and the second chiller, and the two chillers share a condenser. The first water chiller is used to prepare high-temperature chilled water, and its equipment is the first compressor, condenser, first liquid storage tank, first filter, first electronic expansion valve, first evaporator, first The evaporator is connected with the first compressor to form a circuit, in which the high-temperature chilled water starts from the first evaporator, passes through the third electromagnetic valve, the first surface cooler, the first electromagnetic valve, and the first water pump and then returns to the first evaporator. device. The second chiller is used to prepare high-temperature chilled water, and its equipment is the second compressor, the condenser, the second liquid storage tank, the second filter, the second electronic expansion valve, the second evaporator, and the second The evaporator is connected with the second compressor to form a circuit, wherein the low-temperature chilled water starts from the second evaporator, passes through the second surface cooler, and returns to the second evaporator through the second solenoid valve and the second water pump. A third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve are added at the chilled water inlet and outlet of the first surface cooler and the second surface cooler. By adjusting the opening and closing of the three solenoid valves, the first surface cooler The device and the second surface cooler can be connected in series to high-temperature chilled water.

The air treatment method of heat and humidity sectional treatment in the present invention is: after the indoor return air is mixed with the fresh air, it first passes through the first surface cooler to exchange heat with high-temperature refrigerated water, then cools down to a temperature close to the dew point through isohumidity, and removes most of the sensible heat load Enter the second surface cooler; in the second surface cooler, the air further exchanges heat with low-temperature chilled water, cools down and generates condensed water, and removes the humidity load; the air after cooling and dehumidification is processed by the heater and humidifier to the air supply state point, and finally sent to the air-conditioned room after being pressurized by the fan.

The scheme adopted by the heat-humidity segmental treatment air conditioning unit device of the present invention is: the refrigerant in the first chiller unit enters the condenser to condense after being compressed and discharged by the first compressor, and then passes through the first liquid storage tank and the first filter , after being throttled and depressurized by the first electronic expansion valve, it enters the first evaporator to exchange heat with the chilled water. It is sucked and compressed by the first compressor, thereby realizing a cycle. Driven by the first water pump, the high-temperature chilled water flows into the first surface cooler through the third electromagnetic valve, exchanges heat with the air, absorbs sensible heat in the air, and then returns to the first evaporator through the first electromagnetic valve and the first water pump. device. In the second chiller, the refrigerant enters the condenser to condense after being compressed and discharged by the second compressor, then passes through the second liquid storage tank and the second filter, and is throttled and depressurized by the second electronic expansion valve before entering the second evaporation The refrigerant exchanges heat with the chilled water, and absorbs heat to produce low-temperature chilled water. After the refrigerant is completely evaporated, it is re-inhaled by the second compressor, thus completing the cycle. Driven by the second water pump, the low-temperature chilled water flows into the second surface cooler, absorbs latent heat in the air, raises its own temperature, and then returns to the second evaporator through the second solenoid valve and the second water pump.

In view of the fact that the air conditioning unit has more time to operate under partial load and low humidity load, the present invention designs an energy-saving operation scheme under partial load and low humidity load conditions: under partial and low humidity load conditions, the second chiller stops working and does not Prepare low temperature chilled water. The first chiller works normally, the second solenoid valve and the third solenoid valve are closed, the fourth solenoid valve and the fifth solenoid valve are opened, and the first surface cooler and the second surface cooler are connected in series. High-temperature chilled water starts from the first evaporator, driven by the first water pump, enters the second surface cooler through the fifth electromagnetic valve, flows out and then flows into the first surface cooler through the fourth electromagnetic valve, and then passes through the first electromagnetic valve, the first water pump returns to the first evaporator. The air treatment process at this time is: after the indoor return air is mixed with the fresh air, it passes through the first surface cooler and the second surface cooler to exchange heat with high-temperature chilled water, cools down and dehumidifies, and then is processed by the heater and humidifier to the air supply state. , and finally sent to the air-conditioned room after being pressurized by the fan. At this time, by adjusting the speed of the first water pump, that is, changing the flow rate of high-temperature chilled water (the flow rate becomes smaller, the outlet water temperature of the first evaporator will decrease correspondingly, and the flow rate is larger, the opposite is true), so that the high-temperature chilled water can bear a small part of the dehumidification load.

The two compressors in the two chillers adopt a constant and variable form. The variable-capacity compressor is used in the first water chiller to prepare high-temperature chilled water, and the fixed-capacity compressor is used in the second chiller to prepare low-temperature chilled water. When the air conditioning system is in partial load operation, the variable capacity compressor performs energy adjustment to meet the load needs. When the total load is small and the latent heat load is not large, the second chiller is shut down, and the cooling load is completely borne by the high-temperature chilled water prepared by the variable-capacity compressor.

Beneficial effect: the beneficial effect of the present invention is that, while meeting the requirements of the dehumidification load of the air conditioner, the sensible heat load and the humidity load of the air conditioner load are processed in sections, so as to realize the improvement of the evaporation temperature of the chiller unit, thereby improving the energy efficiency ratio of the entire air conditioning system, The energy utilization rate is improved, and the structure of the whole device is simple and compact. Partial load can also make full use of equipment resources, save energy, and have good economy.

Description of drawings

Fig. 1 is a schematic diagram of an air conditioning unit device for heat and humidity staged treatment according to the present invention.

In the figure: fresh air outlet 1; return air outlet 2; first surface cooler 3; second surface cooler 4; heater 5; humidifier 6; fan 7; air supply port 8; first water pump 9; first evaporator 10; the first compressor 11; the condenser 12; the first input end 12a of the condenser; the first output end 12b of the condenser; the second input end 12c of the condenser; the second output end 12d of the condenser; the first liquid storage tank 13 The first filter 14; The first electronic expansion valve 15; The second liquid storage tank 16; The second filter 17; The second electronic expansion valve 18; The second evaporator 19; The second compressor 20; The second water pump 21 ; The first solenoid valve 22; the second solenoid valve 23; the third solenoid valve 24; the fourth solenoid valve 25; the fifth solenoid valve 26;

Detailed ways

Further illustrate the specific embodiment of the present invention in conjunction with accompanying drawing 1: the air-conditioning unit device based on heat and humidity subsection processing comprises air treatment part (I) and water chiller part (II), wherein air treatment part is made up of the first surface cooler 3, The second surface cooler 4, the heater 5, the humidifier 6 and the blower fan 7 are composed, and are sequentially connected through the casing. The chiller part includes a first chiller and a second chiller, and the specific connection mode is that the output end of the compressor 11 of the first chiller is connected to the first input end 12a of the condenser, and the first output end 12b of the condenser is connected to the first liquid storage tank 13 input end, the output end of the first liquid storage tank 13 is connected to the input end of the first electronic expansion valve 15 through the first filter 14, the output end of the first electronic expansion valve 15 is connected to the input end of the first evaporator 10, and the first evaporator 10 The output end is connected to the input end of the first compressor 11 . The chilled water output end of the first evaporator 10 is connected to the chilled water input end of the first surface cooler 3 through the third solenoid valve 24, and the chilled water output end of the first surface cooler 3 is connected to the first water pump through the first solenoid valve 22 9, the output of the first water pump 9 is connected to the chilled water input of the first evaporator 10. The output end of the compressor 20 of the second chiller is connected to the second input end 12c of the condenser, the second output end 12d of the condenser is connected to the input end of the second liquid storage tank 16, and the output end of the second liquid storage tank 16 passes through the second filter 17 It is connected to the input end of the second electronic expansion valve 18 , the output end of the second electronic expansion valve 18 is connected to the input end of the second evaporator 19 , and the output end of the second evaporator 19 is connected to the input end of the second compressor 20 . The chilled water output end of the second evaporator 19 is connected to the chilled water input end of the second surface cooler 4, and is connected with the chilled water output end of the first evaporator 10 through the fifth electromagnetic valve 26 simultaneously, and the second surface cooler 4 The chilled water output end is connected to the input end of the second water pump 21 through the second electromagnetic valve 23, and is connected to the chilled water input end of the first surface cooler 3 through the fourth electromagnetic valve 25 at the same time, and the output end of the second water pump 21 is connected to the second water pump 21. Chilled water input end of evaporator 19.

The heat and humidity treatment process of air is as follows: the fresh air and the indoor return air enter the air conditioning box from the fresh air outlet and the return air outlet respectively and mix them. The heat load enters the second surface cooler, where the air exchanges heat with low-temperature chilled water, further cools down and generates condensed water, and removes the humidity load. The air then passes through the heater, humidifier, and fan in sequence and finally from The air supply port is sent into the room.

The working process of the chiller is: the refrigerant is compressed and discharged in the first compressor and enters the condenser for condensation. After being condensed into a liquid, it passes through the first liquid storage tank and the first filter in turn, and then is throttled by the first electronic expansion valve. Reduce the pressure, enter the first evaporator to evaporate, and produce high-temperature frozen water. After the refrigerant is completely evaporated, it is sucked and compressed by the first compressor again, thus forming a cycle to complete the production of high-temperature frozen water. The high-temperature frozen water is in the first evaporator Exchange heat with the refrigerant to release heat. After the temperature drops, it enters the first surface cooler through the third solenoid valve (at this time, the fourth solenoid valve and the fifth solenoid valve are closed), and the chilled water exchanges heat with the air in it. After the temperature drops Enter the first evaporator again through the first electromagnetic valve and the first water pump. The refrigerant is compressed and discharged in the second compressor and enters the condenser to condense. After being condensed into a liquid, it passes through the second liquid storage tank and the second filter in turn, and then is throttled and depressurized by the second electronic expansion valve to become gas-liquid. The two phases enter the second evaporator, where the refrigerant evaporates to produce low-temperature chilled water. After the refrigerant is completely evaporated, it enters the second compressor again for compression, thereby forming a cycle. The low-temperature chilled water exchanges heat with the refrigerant in the second evaporator , release heat, enter the second surface cooler after the temperature drops (the fourth solenoid valve and the fifth solenoid valve are closed at this time), the chilled water exchanges heat with the air in it, and passes through the second solenoid valve and the second water pump again after the temperature drops. into the second evaporator.

When the air conditioner is under the condition of partial load and low humidity load, the air conditioner unit switches to the low load condition. At this time, the first solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are opened, and the second solenoid valve and the third solenoid valve are turned on. Closed, the first surface cooler and the second surface cooler are connected to high-temperature chilled water in series. The second compressor and the second water pump stop running. The refrigerant flow circuit in the first chiller unit remains unchanged, and the high-temperature chilled water part of the chilled water comes out of the first evaporator and enters the second surface cooler through the fifth solenoid valve (the third solenoid valve is closed at this time). After the cooler comes out, the chilled water enters the first surface cooler through the fourth solenoid valve, and the chilled water comes out of the first surface cooler, passes through the first solenoid valve and the first water pump, and then enters the first evaporator again to complete the chilled water cycle. Under this working condition, the matching between the cooling capacity of the unit and the total load of the air conditioner can be realized by adjusting the rotational speed of the first water pump (that is, adjusting the flow rate of the water pump) and performing variable capacity control on the first compressor.

It can be seen from the above process that, under normal working conditions, the sensible heat load of the air is mainly treated by high-temperature chilled water, and this part of the cooling capacity is generated by the first chiller. The first chiller produces high-temperature chilled water with a high evaporation temperature, and the energy efficiency ratio can be significantly improved. Under low-load conditions, all heat and humidity loads are processed by high-temperature chilled water, and all cooling capacity is generated by the first chiller. Due to the high evaporation temperature and high energy efficiency ratio of the first refrigeration cycle, the energy consumption of the unit is reduced, and the overall performance of the unit is significantly improved.

Claims (6)

1. A kind of air-conditioning unit device of heat and humidity section treatment, it is characterized in that this device comprises air treatment part (I) and water chiller part (II); Air treatment part (I) comprises the first surface cooler (3), The second surface cooler (4), heater (5), humidifier (6) and fan (7) are connected in sequence through the box; the chiller part (II) includes the first chiller and the second chiller Unit; in the first water chiller, the output end of the first compressor (11) is connected to the first input end (12a) of the condenser (12), and the first output end (12b) of the condenser is connected to the first liquid storage tank The input end of (13), the output end of the first liquid storage tank (13) is connected to the input end of the first electronic expansion valve (15) through the first filter (14), and the output end of the first electronic expansion valve (15) is connected to the first The refrigerant input end of an evaporator (10), the refrigerant output end of the first evaporator (10) is connected to the input end of the first compressor (11); the chilled water output end of the first evaporator (10) passes through the first Three electromagnetic valves (24) are connected to the chilled water input end of the first surface cooler (3), and the chilled water output end of the first surface cooler (3) is connected to the first water pump (9) through the first electromagnetic valve (22). At the input end, the output end of the first water pump (9) is connected to the chilled water input end of the first evaporator (10); in the second chiller, the output end of the second compressor (20) is connected to the second input end (12c) of the condenser , the second output end of the condenser (12d) is connected to the input end of the second liquid storage tank (16), and the output end of the second liquid storage tank (16) is connected to the input of the second electronic expansion valve (18) through the second filter (17) end, the output end of the second electronic expansion valve (18) is connected to the refrigerant input end of the second evaporator (19), and the refrigerant output end of the second evaporator (19) is connected to the input end of the second compressor (20); the second evaporator The chilled water output end of the device (19) is connected to the chilled water input end of the second surface cooler (4), and is connected to the chilled water output end of the first evaporator (10) through the fifth solenoid valve (26). The chilled water output end of the surface cooler (4) is connected to the input end of the second water pump (21) through the second solenoid valve (23), and at the same time passes through the fourth solenoid valve (25) and the freezing water of the first surface cooler (3). The water input ends are connected, and the output end of the second water pump (21) is connected to the chilled water input end of the second evaporator (19). 2. The heat-humidity segmental treatment air-conditioning unit device according to claim 1, characterized in that there are two surface coolers in the air-conditioning treatment box: the first surface cooler (3) and the second surface cooler (4); High-temperature chilled water is passed through the first surface cooler (3), and low-temperature chilled water is passed through the second surface cooler (4). 3. The heat-humidity segmental treatment air-conditioning unit device according to claim 1, characterized in that there is a third solenoid valve (24) between the inlet and outlet of the first surface cooler (3) and the second surface cooler (4). ), the fourth solenoid valve (25), and the fifth solenoid valve (26) are used to feed high-temperature chilled water into the two surface coolers in series when the load is small. 4. The heat-humidity segmental treatment air-conditioning unit device according to claim 1, characterized in that two compressors are used to prepare high-temperature chilled water and low-temperature chilled water respectively, wherein the first compressor (11 for preparing high-temperature chilled water) ) is a variable-capacity compressor, the second compressor (20) used to prepare low-temperature chilled water is a constant-capacity compressor, and the first water pump (9) is a variable-flow water pump. 5. The heat-humidity segmental treatment air-conditioning unit device according to claim 1, characterized in that the first chiller unit and the second chiller unit share a condenser (12). 6. A heat-humidity staged air treatment method for an air-conditioning unit device as claimed in claim 1, characterized in that the method is divided into two parts, wherein: The air treatment method of hot and humid section treatment is: after the indoor return air is mixed with the fresh air, it first passes through the first surface cooler (3) to exchange heat with high-temperature chilled water, and then cools down to the dew point temperature through isohumidity, after removing most of the sensible heat load Enter the second surface cooler (4); in the second surface cooler (4), the air further exchanges heat with low-temperature chilled water, cools down and produces condensed water, and removes the humidity load; the air after cooling and dehumidification passes through the heater (5 ), the humidifier (6) is processed to the air supply state point, and finally sent to the air-conditioned room after being pressurized by the fan (7); The method adopted by the air conditioner unit is: the refrigerant in the first water chiller is compressed and discharged by the first compressor (11) and enters the condenser (12) to condense, and then passes through the first liquid storage tank (13) and the first filter After the device (14) is throttled and depressurized by the first electronic expansion valve (15), it enters the first evaporator (10) to exchange heat with the chilled water. After the refrigerant is completely evaporated, the refrigerant is inhaled and compressed by the first compressor (11) again to realize circulation; the high-temperature chilled water flows into the first surface cooler through the third solenoid valve (24) driven by the first water pump (9) (3), heat exchange with the air, absorb sensible heat in the air, and then return to the first evaporator (10) through the first electromagnetic valve (22) and the first water pump (9); the refrigerant in the second chiller After being compressed and discharged by the second compressor (20), it enters the condenser to condense, then passes through the second liquid storage tank (16) and the second filter (17), and is throttled and depressurized by the second electronic expansion valve (18). Entering the second evaporator (19), the refrigerant exchanges heat with the chilled water, and absorbs heat to produce low-temperature chilled water. After the refrigerant is completely evaporated, it is sucked again by the second compressor (20), thereby completing the cycle; the low-temperature chilled water is subjected to the first The drive of the second water pump (21) flows into the second surface cooler (4), absorbs the latent heat in the air, and its temperature rises, and then returns to the second evaporator through the second solenoid valve (23) and the second water pump (21). (19).

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