Dual-circulation fresh air dehumidifying and coil cooling type air conditioning unit

Abstract

The invention discloses a dual-circulation fresh air dehumidifying and coil cooling type air conditioning unit which comprises a high-pressure compressor and a low-pressure compressor which are connected in series, and a second heat exchanger is connected between the input end of the high-pressure compressor and the output end of the low-pressure compressor; a four-way reversing valve is connected at the input end of the low-pressure compressor and further connected to a first heat exchanger, the output end of the high-pressure compressor and a third heat exchanger; the first heat exchanger is connected with two electronic expansion valves respectively, namely connected with the second heat exchanger by the first electronic expansion valve and with the third heat exchanger by the second electronic expansion valve; and the second heat exchanger is connected with a dry coil, and the third heat exchanger is connected with the fresh air unit. Dual-stage compression and air temperature and humidity of the air conditioning unit are respectively controlled, on one hand, dual circulation is utilized to improve the refrigeration coefficient of the refrigeration circulation; on the other hand, interior temperature is controlled by high-temperature cold water in the dry coil so as to prevent the interior of the dry coil from generating condensate water.

Description

technical field [0001] The invention relates to an air-conditioning refrigeration technology, relates to an air-conditioning unit, in particular to a double-circulation fresh air dehumidification plus dry coil cooling air-conditioning unit. Background technique [0002] In the vapor compression refrigeration cycle, after the refrigerant is selected, its evaporation pressure and condensation pressure are determined by the evaporation temperature and condensation temperature respectively. The evaporation temperature is determined by the use of the refrigeration system, and the condensation temperature is limited by the environmental conditions. Sometimes in order to obtain a low temperature, the evaporation temperature is required to be low, and the required evaporation pressure is also very low, resulting in a large compression ratio. The increase of the compression ratio will cause the following problems: [0003] ①The exhaust temperature of the compressor rises and the lub...

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Problems solved by technology

[0006] The object of the present invention is to provide an air conditioner unit with dual-circulation fresh air dehumidification and coil cooling. On the one hand, the air conditioner unit adopts two-stage compression of the compressor and two-stage circulation of the refrigerant to improve the refrigeration efficiency of t

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