Holdover Plates Transport Refrigeration Systems（延期板块运输制冷系统）.pdfVIP

Holdover Plates Transport Rerigeration Systems ® Hercules Manufacturing Company 800 Bob Posey Street • PO Box 497 • Henderson, KY • 42419-0497 1-800-633-3031 270-826-9501 • • FAX: 270-826-0439 • info@ ©2009 Hercules Manufacturing Company, Henderson, KY he Rerigeration Cycle Continuous Refrigeration can be accomplished by several different processes, but the most popular process is the Vapor Compression System. In a compression system, there are two existing pressures: the evaporating or low pressure, and the condensing or high pressure. he refrigerant acts as the transportation medium between the evaporator and the condenser. 2. What Is he Rerigeration Cycle? Basic Cycle Operation 1. High pressure liquid refrigerant is fed from the condenser through the liquid line and the filter-drier to the metering device. 2. he high pressure side is separated from the low-pressure side using a thermostatic expansion valve (TEV). 3. he TEV controls the quantity of liquid refrigerant entering the evaporator. It causes the pressure of the refrigerant to the low side to be reduced. In reducing the low side pressure, the refrigerant reaches its boiling point and begins to vaporize. 4. he low pressure, low temperature refrigerant passes through the evaporator coil and heat flows through the walls of the tubing into the refrigerant to continue the boiling action until the refrigerant is completely vaporized. 5. he refrigerant is superheated to ensure there is no liquid fed through the compressor. As the refrigerant vapor flows through the compressor it is converted from a low pressure vapor