To comprehensively consider temperature and humidity requirements

this paper proposed a room air conditioning system with adjustable temperature and dehumidification functions. Furthermore

the performance of the system in air conditioning and dehumidification modes were examined. The results indicated that the device can realize the air conditioning mode

dehumidification mode with rising temperature

and dehumidification mode with regulated temperature. In the dehumidification mode

under all test conditions

the outlet temperature of the dehumidification mode with regulated temperature was approximately 7% lower than that of the dehumidification mode with rising temperature

and the relative humidity of the outlet was approximately 27% lower. Furthermore

the former mode exhibited a dehumidification amount of approximately 2.8 times of that in the latter mode

and the unit power of dehumidification was approximately 2.6 times of that in the latter mode. Hence

dehumidification mode with rising temperature should be used when the outdoor temperature is lower than 18 ℃

and the compressor can be adjusted via variable frequency. Dehumidification mode with regulated temperature should be used when the outdoor temperature is between 18 ℃ and 26 ℃

and the compressor can be controlled with the "capacity adjustment + variable frequency" method. The system can effectively solve the problem of lower supply air temperature owing to the dehumidification in the middle and lower reaches of the Yangtze River.