An air conditioning system with independent temperature and humidity processing

Abstract

The invention discloses an air conditioning system for independent temperature and humidity processing, including a compressor, the outlet of the compressor is connected to the inlet of a high-temperature condenser, the outlet of the high-temperature condenser is connected to the inlet of a gas-liquid separator, the outlet of the gas-liquid separator is respectively connected to the inlet of a low-temperature condenser and a cooling throttle valve, the outlet of the low-temperature condenser is sequentially connected to a dehumidification throttle valve and a dehumidification evaporator, the outlet of the cooling throttle valve is connected to the inlet of the cooling evaporator, the outlet of the dehumidification evaporator is connected to the outlet of the cooling evaporator and is connected to the inlet of the compressor. The air conditioning system of the invention solves the problems of energy waste of a single system and high cost of two systems in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and relates to an air conditioning system for independently processing temperature and humidity. Background Art

[0002] Buildings in areas with hot summers and cold winters in my country and in areas with hot summers and warm winters need to treat the air in the building and the fresh air in the summer. At present, conventional air-conditioning systems generally use air coolers to cool and condense the air for dehumidification, and then send the cooled air into the room to meet the requirements of indoor heat removal and dehumidification. Taking the indoor air-conditioning design status as an example, the indoor air-conditioning design temperature in summer is 26℃, the relative humidity is 55%, and the indoor dew point temperature in summer is 16.6℃. The heat removal and dehumidification task of the air-conditioning system is to extract heat from the indoor 26℃ environment and extract moisture at the dew point temperature of 16.6℃.

[0003] In fact, heat removal and dehumidification are two different thermodynamic processes, and their requirements for energy quality are also different. When using the condensation dehumidification method to remove indoor residual moisture, the temperature of the cold source needs to be lower than the dew point temperature of the indoor air. Considering the heat transfer temperature difference and the medium transmission temperature difference, a cold source temperature of about 7°C is required to achieve a dew point temperature of 16.6°C. Therefore, the existing air conditioning system uses chilled water at 5-7°C. In the air conditioning system, a high-temperature cold source could have been used to treat the sensible heat load part (accounting for more than 50% of the total load), but it was shared with the dehumidification process. The low-temperature cold source of 5-7°C is used for treatment, resulting in a waste of energy utilization quality. Moreover, although the humidity (moisture content) of the air after condensation dehumidification meets the requirements, the temperature is too low and sometimes needs to be reheated, resulting in further waste of energy. If two independent systems are used to control and adjust the temperature and humidity of the indoor air respectively, it will cause additional equipment investment. Summary of the invention

[0004] The purpose of the present invention is to provide an air conditioning system for independently processing temperature and humidity, which solves the problems of energy waste in a single system and high cost of two systems in the prior art.

[0005] The technical solution adopted by the present invention is an air-conditioning system with independent temperature and humidity processing, including a compressor, the outlet of the compressor is connected to the inlet of a high-temperature condenser, the outlet of the high-temperature condenser is connected to the inlet of a gas-liquid separator, the outlet of the gas-liquid separator is respectively connected to the inlet of a low-temperature condenser and a cooling throttle valve, the outlet of the low-temperature condenser is connected to a dehumidification throttle valve and a dehumidification evaporator in sequence, the outlet of the cooling throttle valve is connected to the inlet of the cooling evaporator, the outlet of the dehumidification evaporator is connected to the outlet of the cooling evaporator and to the inlet of the compressor.

[0006] The present invention is also characterized in that:

[0007] The dehumidification evaporator is provided with a fan.

[0008] A fan is provided on the cooling evaporator.

[0009] A fan is provided on the high temperature condenser.

[0010] The low-temperature condenser is provided with a fan.

[0011] The dehumidification evaporator is connected with the dehumidification heat exchanger and the circulation pump a in sequence to form a closed loop.

[0012] The cooling evaporator is connected with the cooling heat exchanger and the circulation pump b in sequence to form a closed loop.

[0013] The high-temperature condenser is connected to the cooling tower, circulating pump c, and low-temperature condenser in sequence to form a closed loop.

[0014] The beneficial effects of the present invention are: an air-conditioning system for independent treatment of temperature and humidity, using a non-azeotropic mixed refrigerant, after the dehumidification evaporator is connected to the dehumidification heat exchanger, the low-boiling-point refrigerant therein has a low evaporation temperature, which is used to treat the wet load of the building; after the cooling evaporator is connected to the cooling heat exchanger, the high-boiling-point refrigerant therein has a high evaporation temperature, which is used to treat the heat load of the building, that is, using one set of air-conditioning system to achieve independent treatment of temperature and humidity, thereby reducing the energy consumption of the air-conditioning system and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 2 is a schematic diagram of the structure of an embodiment 1 of an air conditioning system for independent temperature and humidity processing according to the present invention;

[0016] Figure 2 It is a structural schematic diagram of Example 2 of an air-conditioning system for independent temperature and humidity control of the present invention.

[0017] In the figure, 1. compressor, 2. high temperature condenser, 3. gas-liquid separator, 4. low temperature condenser, 5. dehumidification throttle valve, 6. dehumidification evaporator, 7. cooling throttle valve, 8. cooling evaporator, 9. cooling tower, 10. dehumidification heat exchanger, 11. cooling heat exchanger, 12. circulation pump a, 13. circulation pump b, 14. circulation pump c. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] The present invention provides an air conditioning system for independently processing temperature and humidity, such as Figure 1As shown, it includes a compressor 1, the outlet of the compressor 1 is connected to the inlet of the high-temperature condenser 2, the outlet of the high-temperature condenser 2 is connected to the inlet of the gas-liquid separator 3, the outlet of the gas-liquid separator 3 is respectively connected to the inlets of the low-temperature condenser 4 and the cooling throttle valve 7, the outlet of the low-temperature condenser 4 is connected with the dehumidification throttle valve 5 and the dehumidification evaporator 6 in sequence, the outlet of the cooling throttle valve 7 is connected to the inlet of the cooling evaporator 8, the outlet of the dehumidification evaporator 6 is connected to the outlet of the cooling evaporator 8 and is connected to the inlet of the compressor 1, the dehumidification evaporator 6 is connected to the dehumidification heat exchanger 10 and the circulation pump a12 in sequence to form a closed loop, the cooling evaporator 8 is connected to the cooling heat exchanger 11 and the circulation pump b13 in sequence to form a closed loop, and the high-temperature condenser 2 is connected to the cooling tower 9, the circulation pump c14 and the low-temperature condenser 4 in sequence to form a closed loop.

[0021] The working principle of the air-conditioning system with independent temperature and humidity treatment of the present invention is as follows: the air-conditioning system of the present invention adopts a non-azeotropic mixed refrigerant composed of R134a and R22, and the mixing ratio of the high-boiling point refrigerant R134a and the low-boiling point refrigerant R22 is jointly determined by the heat exchange capacity of the cooling evaporator 8 and the dehumidification evaporator 6, as well as the physical properties of the refrigerant.

[0022] The superheated refrigerant vapor discharged from the compressor 1 enters the high-temperature condenser 2, and most of the high-boiling-point refrigerant condenses and releases heat to form a two-phase refrigerant liquid, which then enters the gas-liquid separator 3 and is divided into two paths: one path is high-pressure refrigerant vapor rich in low-boiling-point refrigerant and enters the refrigerant inlet of the low-temperature condenser 4 as a working fluid. The refrigerant vapor is condensed into a saturated or supercooled refrigerant liquid in the low-temperature condenser 4, and the saturated or supercooled refrigerant liquid enters the dehumidification throttle valve 5 to throttle and cool down to become a two-phase refrigerant fluid. The pressure at this point under the design condition is 350k Pa, the temperature is -10℃; then it enters the dehumidification evaporator 6 to absorb heat and become a saturated or superheated refrigerant gas, and another saturated high-boiling point refrigerant liquid enters the cooling throttle valve 7 as the working liquid to throttle and cool down to become a two-phase refrigerant gas. Under the design conditions, this point is 350kPa and the temperature is 5℃; then it enters the cooling evaporator 8 to absorb heat and become a saturated or superheated refrigerant gas. After the saturated or superheated refrigerant gas is discharged from the cooling evaporator 8, it merges with the saturated or superheated refrigerant gas discharged from the dehumidification evaporator 6 and enters the compressor 1 to complete the cycle.

[0023] Driven by the circulation pump 14, the heat medium flowing out of the cooling tower 9 first enters the low-temperature condenser 4 to absorb heat and heat up, then flows out of the low-temperature condenser 4 and enters the high-temperature condenser 2 to absorb heat and heat up, and then returns to the cooling tower 9 to release heat to the environment.

[0024] The dehumidification refrigerant driven by the circulation pump 12 flows out of the dehumidification heat exchanger 10 and enters the dehumidification evaporator 6 to release heat, and the temperature drops to 7° C. After flowing out of the dehumidification evaporator 6, it returns to the dehumidification heat exchanger 10 to absorb heat.

[0025] The circulating pump 13 drives the cooling refrigerant to flow out of the cooling heat exchanger 11 and then enter the cooling evaporator 8 to release heat, and the temperature is reduced. After flowing out of the cooling evaporator 8, it returns to the cooling heat exchanger 11 to absorb heat.

[0026] The air in the building is cooled down after passing through the cooling evaporator 11 and then returns to the building. The air in the building and the fresh air are cooled down after passing through the dehumidifying evaporator 10, and the water therein is analyzed and then enters the building.

[0027] Example 2

[0028] The present invention provides an air conditioning system for independently processing temperature and humidity, such as Figure 2 As shown, it includes a compressor 1, the outlet of the compressor 1 is connected to the inlet of the high-temperature condenser 2, the outlet of the high-temperature condenser 2 is connected to the inlet of the gas-liquid separator 3, the outlet of the gas-liquid separator 3 is respectively connected to the inlet of the low-temperature condenser 4 and the cooling throttle valve 7, the outlet of the low-temperature condenser 4 is sequentially connected with the dehumidification throttle valve 5 and the dehumidification evaporator 6, the outlet of the cooling throttle valve 7 is connected to the inlet of the cooling evaporator 8, the outlet of the dehumidification evaporator 6 is connected to the outlet of the cooling evaporator 8 and the inlet of the compressor 1, the dehumidification evaporator 6 is provided with a fan, the refrigerant in the low-temperature evaporator 6 directly exchanges heat with the air, and the air is cooled and dehumidified; the cooling evaporator 8 is provided with a fan, the refrigerant in the evaporator 8 directly exchanges heat with the air, and the air is cooled; the high-temperature condenser 2 and the low-temperature condenser 4 are respectively provided with fans, so that the refrigerant therein directly exchanges heat with the air and dissipates the heat to the environment. It is suitable for users with relatively small temperature and humidity loads.

Claims

1. An air conditioning system with independent temperature and humidity processing, characterized in that: The invention comprises a compressor (1), wherein the outlet of the compressor (1) is connected to the inlet of a high-temperature condenser (2), the outlet of the high-temperature condenser (2) is connected to the inlet of a gas-liquid separator (3), the outlet of the gas-liquid separator (3) is respectively connected to the inlet of a low-temperature condenser (4) and a cooling throttle valve (7), the outlet of the low-temperature condenser (4) is sequentially connected to a dehumidification throttle valve (5) and a dehumidification evaporator (6), the outlet of the cooling throttle valve (7) is connected to the inlet of a cooling evaporator (8), the outlet of the dehumidification evaporator (6) is connected to the outlet of the cooling evaporator (8) and is connected to the inlet of the compressor (1); The dehumidification evaporator (6) is connected to the dehumidification heat exchanger (10) and the circulation pump a (12) in sequence to form a closed loop; The cooling evaporator (8) is connected in sequence to the cooling heat exchanger (11) and the circulation pump b (13) to form a closed loop; The high-temperature condenser (2) is connected to the cooling tower (9), the circulation pump c (14), and the low-temperature condenser (4) in sequence to form a closed loop.

2. The air conditioning system for independent temperature and humidity processing according to claim 1, characterized in that: The dehumidification evaporator (6) is provided with a fan.

3. The air conditioning system for independent temperature and humidity processing according to claim 1, characterized in that: The cooling evaporator (8) is provided with a fan.

4. The air conditioning system for independent temperature and humidity processing according to claim 1, characterized in that: The high-temperature condenser (2) is provided with a fan.

5. The air conditioning system for independent temperature and humidity processing according to claim 1, characterized in that: The low-temperature condenser (4) is provided with a fan.

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