A Study on Suction Gas Heating in a Rolling Piston Rotary Compressor

Abstract

This paper is concerned with a rolling piaton type rotary compressor for air conditioning use. Heat transfer from the cylinder surface to the suction gas in the suction process is investigated. The suction gas heating is experimentally examined by the change of the volumetric efficiency of the compressor when the suction gas temperature is changed while keeping the lubricating oil temperature constart. It is made clear that the volumetric efficiency drop caused by the suction gas heating is 510 % which is equal 1/22/3 of the total volumetric efficiency drop. Based upon that efficiency drop, the heat flow to the suction gas is calculated. It is also calculated using theoretical temperature distribution of cylinder wall. Average heat transfer coefficient in the suction process is estimated in the range of 800 W/(m²·K) ±20 % which is close to the values expected from McAdms' and Adair's correlations.