| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method for an air-conditioner allowing the operation for an always optimum refrigerating cycle, without additionally using sensors. SOLUTION: An exterior heat exchange temperature sensor 9, an interior heat exchange temperature sensor 9 and a discharge temperature sensor 8 are provided for detecting an evaporation temperature Te and a condensation temperature Tc. A degree of superheat SH corresponding thereto for the optimum refrigerating cycle is found from a Mollier chart, a discharge temperature Trd in a theoretical cycle is found from an evaporation temperature Te, a condensation temperature Tc and the degree of superheat SH, and the discharge temperature Trd in the theoretical cycle is corrected with compression efficiency determined by the unit performance of a compressor to calculate a target discharge temperature Tmd. The opening of an electronic expansion valve is controlled so that an actual discharge temperature Td approximates to the target discharge temperature Tmd. Thus, the degree of superheat is kept for the always optimum refrigerating cycle without additionally using conventional sensors for detecting an interior heat exchange inlet pipe temperature and a compressor suction pipe temperature. |
