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An air conditioning unit based on subcooling and reheating

An air-conditioning unit and supercooling technology, which is applied to refrigerators, air-conditioning systems, refrigeration components, etc., can solve the problems of complex pipeline design, difficult air valve control, and complex air volume adjustment in the secondary return air system, so as to improve refrigeration efficiency, Simple system design and control design, independent and precise control effect

Active Publication Date: 2018-07-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The primary return air system needs to reheat the air supply, which consumes a lot of energy; compared with the primary return air system, the secondary return air system does not require reheating equipment and has higher energy efficiency, but the secondary return air system has complex pipeline design and difficult air valve control
Moreover, when the outdoor temperature deviates from the design operating point, the air volume adjustment is complicated, and there are many problems in practice
[0004] Therefore, both types of systems commonly used have their own limitations

Method used

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  • An air conditioning unit based on subcooling and reheating
  • An air conditioning unit based on subcooling and reheating
  • An air conditioning unit based on subcooling and reheating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An air-conditioning unit based on subcooling and reheating for regulating the temperature in the air-conditioned space 23, such as figure 1 As shown, it is equipped with a fresh air heat recovery device.

[0038] The air conditioning unit of this embodiment includes a compressor 1, a condenser 2, a throttling device 7, an evaporator 8, a subcooler 4, an air supply fan 22, a return air fan 24, an air heat recovery device 19, a fresh air outlet 20 and an exhaust fan. Tuyere 27, No. 1 three-way valve 3, No. 2 three-way valve 6, first damper 21, second damper 25, third damper 26, refrigerant connecting pipes 10, 11, 12, 13, 14, 15, 16, 17, 18, air ducts 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53. Both the evaporator 8 and the subcooler 4 have refrigerant passages and air passages

[0039] The refrigerant passages of the compressor 1, the condenser 2, the throttling device 7, and the evaporator 8 are connected end-to-end through the refrigerant connecting pipe ...

Embodiment 2

[0048] Such as figure 2 As shown, the difference from Embodiment 1 is that the air-conditioning unit in this embodiment has no fresh air heat recovery device, and the working principle is the same as that of Embodiment 1 except that it does not have an air heat recovery device.

[0049] The refrigerant circuit is exactly the same as in Embodiment 1.

[0050] In the air flow path, outdoor fresh air is sucked in from the fresh air outlet 20 , passes through the air pipe 40 , the first air valve 21 , and the air pipe 41 , and mixes with the return air from the air pipe 49 in the air pipe 42 . The mixed air is first sent to the evaporator 8 for cooling and dehumidification, and then through the air duct 43, it is sent to the subcooler 4 and then heated to a specified temperature. The air processed by heat and humidity is sent into the indoor space 23 through the air pipe 44 , the blower fan 22 and the air pipe 45 . Simultaneously, the air in the indoor space 23 is extracted thr...

Embodiment 3

[0053] A new air-conditioning unit based on subcooling and reheating, the structure and process are as follows image 3 As shown, the working principle is similar to that of Example 1, except that the fresh air is no longer mixed with the return air, and the heat and humidity treatment is directly performed.

[0054] The refrigerant circuit is exactly the same as in Embodiment 1.

[0055] In the air flow path, outdoor fresh air is sucked from the fresh air outlet 20 , enters the air heat recovery device 19 through the air duct 40 , and is precooled in the air heat recovery device 19 . Subsequently, the precooled fresh air is first sent to the evaporator 8 for cooling and dehumidification through the air pipe 41, and then sent to the subcooler 4 through the air pipe 42 to be heated to a specified temperature. The air processed by heat and humidity is sent into the indoor space 23 through the air pipe 43 , the blower fan 22 and the air pipe 44 . Simultaneously, the air in the ...

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Abstract

The invention relates to an air-conditioning unit based on supercooling and reheating, which is used to adjust the temperature and humidity in the air-conditioning space, including a compressor, a condenser, a throttling device, an evaporator, a subcooler, an air supply fan, a return air fan, The fresh air outlet and exhaust outlet, refrigerant connecting pipe and air pipe, the air conditioning unit share the refrigerant circulation circuit and the air flow path, and the invention uses the supercooler to recover the cooling capacity of the low-temperature air at the outlet of the evaporator, on the one hand, it plays a role in reheating On the other hand, it increases the subcooling degree of the refrigeration system and improves the energy efficiency of the system. Compared with the prior art, the present invention adopts the primary return air pipeline layout, and the system design and control design are simple; the present invention does not need to consume additional energy to reheat the air, but can realize independent and precise control of temperature and humidity; in the present invention, the over The cooling capacity recovered by the cooler increases the cooling capacity per unit mass flow of the refrigeration system and improves the refrigeration efficiency.

Description

technical field [0001] The invention relates to an air conditioning unit, in particular to an air conditioning unit based on supercooling and reheating. Background technique [0002] In centralized air conditioning systems and local air conditioning units, the most commonly used are the primary return air system (the return air is mixed with the outdoor fresh air before cooling and dehumidification) and the secondary return air system (the return air and the fresh air are mixed and then cooled and dehumidified, and then combined with the return air again). wind mixing). [0003] The primary return air system needs to reheat the air supply, which consumes a lot of energy; compared with the primary return air system, the secondary return air system does not require reheating equipment and has higher energy efficiency, but the secondary return air system has complex pipeline design and difficult air valve control . Moreover, when the outdoor temperature deviates from the desi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F5/00F24F12/00F25B41/04F25B41/20
CPCF24F5/001F24F12/006F25B41/20
Inventor 曹祥张春路邵亮亮杨智
Owner TONGJI UNIV
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