AIR-SUPPLYING ENTHALPY-ADDING AIR-CONDITIONING SYSTEM AND CONTROL METHOD THEREFOR

摘要

Disclosed are an air-supplying enthalpy-adding air-conditioning system and a control method therefor. The system comprises a compressor (1), an indoor heat exchanger (7), an electronic expansion valve (4), and an outdoor heat exchanger (3). The control method comprises the following steps: detecting a temperature Td of an exhaust port of a compressor (1), a temperature Ts of an air suction port of the compressor (1) and a temperature T3 of an outdoor heat exchanger in n preset periods in real time; calculating an air suction superheat degree ΔT of the compressor (1) in an n^th preset period according to the Ts and the T3; obtaining a first opening degree of the electronic expansion valve (4) in an (n+1)^th preset period according to an average value of the ΔT in the n^th preset period; calculating a difference ΔTd between the average temperature Td(n-1), of the exhaust port in the (n-1)^th preset period and the average temperature Td(n) of the exhaust port in the n^th preset period, and adjusting the first opening degree of the electronic expansion valve (4) in the (n+1)^th preset period according to the difference ΔTd. The first opening degree of the electronic expansion valve in the (n+1)^th preset period is adjusted according to the difference ΔΤd. The control method enables the air-supplying enthalpy-adding air-conditioning system to operate in an optimal state, and control is accurate and convenient.