Performance test method of two-stage compressors equipped with flash-tank
Two performance test methods of two-stage compressors equipped with flash-tank are studied:one flash-tank test method is to simulate the actual use of the air-conditioning systems(black box test method),which only controls the intermediate pres-sure and does not control the vapor injection temperature;the other flash-tank test mothod is to control the intermediate pressure and vapor injection temperature(standard test method)stated in GB/T 5773-2016 The method of performance test for positive displacement refrigerant compressors.The results show that the black box test method has the situation that the injection refrigerant of the compressor is wet vapor,at which time the compressor power will decrease,and the energy efficiency will be optimal in this state;in the standard test method,the injection refrigerant are superheated vapor,resul-ting in a higher test cooling capacity than the actual result;the black box test method is suitable for the performance assessment during the variation of intermediate pressure,and the stadard test method is suitable for comparing the performance difference under the same intermediate pressure.
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