Ocean-going Vessels, Refrigerant Alternatives

Because of its effect of OOP (Ozone Depletion Potential) and GWP ( Global Warming Potential) ,CFC12 and HCFC22 .widely used in air-conditioning and refrigeration equipment, have been or will be phased out according to the revisions of the Montreal Protocol and other international protocols. Many substitutes have been proposed, but no one perfectly replaces the CFC and HCFC refrigerants used now. New generation alternatives are being investigated worldwide. The purpose of this paper is to analyze the change of COP and capacity after the leakage of the non-azeotropic mixing refrigerant in marine refrigeration systems.Ocean-going ships' refrigerant substitution is one of important aspects of refrigerant substitution at present. Facing the serious situation of restricting the use of CFCs and HCFCs recently, this paper analyses the affection on China's shipping, especially ocean transportation.By surveying and studying on China Ocean Shipping Company and China shipping (Group) Company, the author analyze the history and current situation of refrigerant substitution about ocean-going ships. According to the national conditions, the countermove of restricting CFCs and HCFCs in China shipping is proposed.According to GB5773-86 , The methods of performance test for positive displacement refrigerant compressors>, simulating the refrigeration equipment in ocean-going ships, an experimental refrigerant installation is established. Some related experiments are done and the experimental results show that the installation's precision is conformed to the demand of GB5773-86< The methods of-3-performance test for positive displacement refrigerant compressors>. The thermocouple system for measuring the temperature is manufactured.A new experimental method is recommended in this paper and described by mathematical model.Basing on some person's models, a leakage model for non-azeotropic mixing refrigerant HCFC22/CFC12 is put forward. The theoretical model shows the leakage of Non-azeotropic mixing refrigerant will change its composition. The change of the cycle performance caused by the leakage of the refrigerant is theoretically and experimentally analyzed. Both results show that in the industrial application, the change of the cycle performance caused by the leakage of the refrigeration systems is insignificant, and will not impede its further application.A model about energy analysis for vapor compression cycle is put forward. A thermodynamic synthetical energy study on the system and its main part is carried out which concluded that the change of the system's exergy caused by the leakage of the refrigerant is also insignificant and can be neglected in the industry.