Abstract: In view of the high exhaust temperature characteristic of the R32 rotary compressor, a multi-point heat flow/temperature synchronous measurement and energy conservation cross-verification method is adopted to solve the problems of difficult parameter measurement and insufficient verification in the traditional acquisition of heat transfer coefficients. This approach resolves the challenges of difficult parameter acquisition and insufficient validation in traditional heat transfer coefficient determination. High-precision sensors were installed on the compressor shell and accumulator surfaces to measure and validate heat flux/temperature distributions under typical operating conditions. The results indicate that: (1) The compressor shell temperature initially increases and then decreases from top to bottom, with the highest temperature observed at the motor outer wall. Under rated heating conditions, increased rotational speed and pressure differential lead to significantly higher temperatures and heat flux densities compared to Chinese national standard (CNS) conditions, though distribution trends remain consistent. (2) The accumulator temperature decreases progressively from top to bottom, while its heat flux density exhibits a “higher at both ends and lower in the middle” pattern . It mainly fills the gap of basic data on heat exchange of the R32 compressor housing, providing a basis for heat transfer modeling and heat dissipation design.

Key words: Rotary compressor, Experimental study, Heat flux density, Shell thermal characteristics