1. Basic thermal properties affecting the ratio of ideal cycle cooling capacity to energy consumption.
2. Physical and thermal properties (flow layout of compressors, heat exchangers, piping and refrigeration units) that affect the structure, size, quality and operation economy of system components and the entire system.
3. Use auxiliary equipment to provide basic thermal properties (supercooling, internal heat exchange) for COP and operating economy.
4. Auxiliary equipment is required to overcome fundamental thermodynamic and physical properties (oil separation, dehumidification, etc.) that adversely affect the economy of operation.
