Full-fresh-air air handling unit capable of overcooling and overheating synchronously

Abstract

The invention discloses a full-fresh-air air handling unit capable of overcooling and overheating synchronously. The full-fresh-air air handling unit comprises a compressor, a four-way reversing valve, an outdoor handling unit heat exchanger, a bi-directional expansion valve and an indoor air supply unit heat exchanger. An air inlet end and an air outlet end of the compressor are connected with two opposite connectors on the four-way reversing valve respectively, a refrigeration inlet of the outdoor handling unit heat exchanger and a refrigeration outlet of the indoor air supply unit heat exchanger are connected with the other two opposite connectors on the four-way reversing valve respectively, and a refrigeration outlet of the outdoor handling unit heat exchanger is connected with a refrigeration inlet of the indoor air supply unit heat exchanger through the bi-bidirectional expansion valve. The full-fresh-air air handling unit effectively solves the problem of loss of obtained overcooling degree, improves the stability and reliability of working of the expansion valve, avoids wet compression of the compressor, can improve safety and reliability of the unit, and increases working energy efficiency ratio.

Description

technical field [0001] The invention relates to a fresh air handling unit, in particular to a fresh air handling unit with synchronous supercooling and overheating, belonging to the technical field of building environment and equipment engineering. Background technique [0002] The Fresh Air Handling Unit is a device that uses direct evaporative cooling or heat pump heating to deal with fresh air, and directly provides centralized processing of fresh air to confined spaces, rooms or areas through air ducts. It is widely used in pharmaceuticals, chemicals, Food, electronics, metallurgy and other fields. At present, the direct evaporative fresh air air handling unit is usually composed of a compressor, a four-way reversing valve, an outdoor processing unit heat exchanger, an expansion valve and an indoor air supply unit heat exchanger. Under this condition, the heat exchange generated by the phase change of the refrigerant with the external environment is used to improve the ...

AI Technical Summary

Problems solved by technology

At this time, it is difficult to ensure a certain degree of subcooling of the refrigerant, which is not conducive to the stable operation of the expansion valve.

[0009]In addition, it is worth noting that the superheat of the refrigerant at the compressor inlet often needs to be controlled at 5°C to 11°C: if the superheat is too low, the compressor is prone to wet compression , which affects the stability and safety of the refrigeration system; if the degree of superheat is too high, the exhaust temperature of the compressor is too high, the input power of the compressor increases, and the performance of the fresh air air handling unit decreases. At the same time, its stability and safety are also affected. less than guaranteed

Invention patent CN101576297 B is a fresh air air handling unit with large supercooling degree, without considering the problem of refrigerant superheat degree control

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