Analysis of Suction Passage Loss in a Rotary Compressor

The compression efficiency of a rolling piston type rotary compressor for room airconditioners was analyzed, Suction passage loss is one of the detracting factors in compression efficiency and we studied its main cause, i.e. the pressure pulsation generated in the suction line, and clarified the relation between suction line specification and suction passage loss. A method of evaluating the suction passage loss was also derived. First, the pressure pulsations in various suction line elements and cylinder suction chamber were measured to experimentally estimate the relation of the suction line specification with the pressure pulsation and suction passage loss. Then, a mathematical model was constructed for each suction line element and its validity was tested. And the relation of the specification with the pressure pulsation and suction passage loss was theoretically estimated. Lastly, a discussion was made with reference to speed control.