ABSTRACT
This chapter mainly introduces the basic knowledge of vapor compression heat pump cycle, the basic principle of two-stage compression heat pump cycle and the theoretical model of thermodynamic cycle, and analyzes the characteristics of two-stage compression two-step throttling interstage incomplete cooling cycle by simulating calculation. A method for determining the cylinder volume ratios and the cylinder volumes of a triple-cylinder two-stage rolling piston compressor with variable volume ratio is proposed, and the volume ratios of the compressor for the air-to-air heat pump and the air-to-water heat pump in various applications are recommended. Finally, the theoretical analysis of the optimal intermediate pressure in the variable volume ratio two-stage compression cycle is introduced.
