Energetic Macroscopic Representation of Self-Air-Cooling Reciprocating Compressor’s Cooling System

The self-air-cooling system, as an important part of reciprocating compressor, can continuously cool the cylinder without any auxiliary equipment, which is key to energy saving and efficiency increasing especially for high-pressure micro-compressor. Since it is a complex thermodynamic system with compressible fluid transmission and heat exchange between multiple different subsystems, establishing an accurate mathematical model is very difficult. The thermodynamic models of subsystem are respectively established based on the energetic macroscopic representation (EMR). The EMR model of cooling system is achieved by connecting them based on its working principles, which makes the solving process clear and improves the readability. It is verified by good curve-fitting performance between simulation and experiment in different conditions, which provides foundation for parameters characteristic analysis and structure optimization design.