Cabinet air conditioner and control method thereof

Abstract

The invention discloses a cabinet air conditioner and a control method thereof. A mixed refrigerant R32 / R290 with a small global warming potential (GWP) value is used by the cabinet air conditioner, and an electromagnetic valve is positioned in an indoor unit and is tightly connected with an indoor heat exchanger used for heat exchange between the refrigerant and indoor air. A small-pipe-diameter heat exchanger or micro-channel heat exchanger can be adopted, the size of the heat exchanger can be reduced effectively, and global warming can be prevented effectively. In a refrigerating circuit, the cabinet air conditioner comprises a refrigerating compressor, a four-way reversing valve, an outdoor heat exchanger used for heat exchange between the refrigerant and an environment medium, a dry filter, a throttle mechanism, the indoor heat exchanger used for heat exchange between the refrigerant and the indoor air, the electromagnetic valve on a connecting pipeline between the outdoor heat exchanger and the indoor heat exchanger, an indoor unit fan and an outdoor unit fan. The filling quantity of the mixed refrigerant is the refrigerating capacity of 60-130g / kW. The cabinet air conditioner has the advantages that combustion danger possibly caused by the filling quantity of the refrigerant is reduced, safety of a refrigerating system is improved, and the cabinet air conditioner is safe and environment friendly.

Description

technical field [0001] The invention relates to a cabinet-type air conditioner, in particular to a cabinet-type air conditioner which uses R32 / R290 mixed refrigerant to replace R22 and R410a in refrigeration, air-conditioning, heat pump and other equipment. Background technique [0002] At present, in small and medium-sized refrigeration, air-conditioning, and heat pump units (such as room air conditioners, unitary air-conditioning units, multi-connected units, etc.), HCFC- 22 is the most widely used refrigerant with the best comprehensive performance as a refrigerant, but HCFC-22 has ODP (Ozone Depletion Potential) value and high GWP (Global Warming Potential) value, which is not friendly to the environment and has been The 19th Conference of the Parties to the Montreal Protocol held in 2007 included substances that were required to be phased out in advance. [0003] For the research on the substitutes of HCFC-22, a lot of research work has been carried out at home and abr...

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Problems solved by technology

[0004] However, these refrigerants all have high greenhouse gas effect values ​​(GWP greater than 1400), among which, R410A has a higher GWP value than HCFC-22. In the case of global warming, the high GWP value Refrigerants will also be restricted and eliminated. At this time, R410A is not an ideal substitute for HCFC-22.

At present, from the perspective of the new environmental protection requirements of ODP and GWP, HC-290 (ODP=0, GWP=20), HFC-32 (ODP=0, GWP=675) and HFC1234yf (ODP=0, GWP=6) As pure working fluids, they are the best substitutes for HCFC-22 (the refrigeration capacity per unit volume of HFC1234yf is small, and it is inferior to the former two when replacing HCFC22), but the common feature of these refrigerants is that they are all flammable, and R32 The exhaust temperature of the air conditioner is high, and there is a greater safety risk in the actual use process, especially in the application of refrigeration, air conditioning, and heat pumps that are in close contact with personnel, such as room air conditioners, unitary air conditioning units, and multi-connected units.

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