Performance Analysis of a Twin Rotary Compressor
For a twin rotary compressor, a computer simulation program has been developed. With R22, predicted cooling capacity, compressor input and EER were found to be in good agreement with experimental results. Calculated P-V diagram was also compared well to that of measurement. With the simulation program, parametric study has been performed to investigate effects of cylinder dimensions on R410A twin rotary compressor performance. Over the ranges of cylinder dimensions studied, some variations were found for volumetric, adiabatic and mechanical efficiencies, but overall compressor performance did not change much. Discharge port configuration was found to have large effect on adiabatic efficiency, but not much on volumetric efficiency.
Working performance of R-32 two-stage compression system in domestic air-conditioner
Abstract A numerical simulation model of a two-stage compression refrigeration system with vapor injection using R-32 as refrigeration is newly presented in this paper. The middle chamber state of the twin rotary compressor with vapor injection was simulated. Based on that, the whole system model was set up and it was validated by comparing the predictions with measured data. The results show that, compared with No-injection cycle, R-32 vapor injection system provides very significant performance improvements for cooling performance. The most suitable volume ratio of the high-pressure cylinder to low-pressure is between 0.65 and 0.78; Compared with the single-stage compression system, the cooling capacity and COP of the two-stage compression system can improve 5–15% and 10–12%, respectively; The optimum vapor injection pressure corresponding to the comprehensive cooling performance was 1.3–1.8 MPa.
Efficiency analysis of power consumption in small hermetic refrigerant rotary compressors
Resume On rend compte d'etudes theoriques et experimentales sur de petits compresseurs rotatifs hermetiques destines aux conditionneurs d'air de piece. Si l'on compare les compresseurs rotatifs et les compresseurs alternatifs du point de vue du rendement, le compresseur rotatif a l'inconenient de presenter plus de pertes par frottement du fait que le nombre des surfaces en glissement de la chambre de compression augmente, cependant il presente les trois caracteristiques importantes suivantes: le rendement volumetrique est eleve; les pertes au clapet sont faibles; et l'aspiration, la compression et le refoulement s'effectuant simultanement, la vitesse d'aspiration et la vitesse de refoulement sont reduites de moitie environ. Le rendement du compresseur rotatif est donc plus eleve que celui du compresseur alternatif.