Numerical modeling of a novel two-stage linear refrigeration compressor

Abstract Linear compressors have started to apply in refrigeration owing their oil-free operation, capacity modulation by variable stroke and higher seasonal efficiency. Nevertheless, linear are subject a high seal leakage loss piston offset (drift), particularly at pressure ratios. Meanwhile, there is reduction the accuracy of resonant frequency prediction due very nonlinear gas spring ratios, leading compressor Two-stage operation considered as feasible solution aforementioned issues lower ratio for each stage. A numerical model two-stage compression system using presented this study investigate performance under various operating conditions. The proposed consists thermodynamic sub-model, dynamic sub-model reed valve sub-model. Experiments also conducted based on with two connected parallel validate model. mean absolute percentage errors predicted mass flow rate power input 2.47% 8.49%, respectively. modeling results show that coefficient 5.5 2.0 single-stage while condenser temperature evaporator 50°C ?23°C, offers superior system.