Mar 14, 2016 · In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor at state 1 as saturated vapor and is compressed isentropically to the condenser pressure. The temperature of the refrigerant increases during this isentropic compression process to well above the temperature of the surrounding medium.
7–38 A cylinder is initially filled with refrigerant R-134a vapor at 50 C and 0.8-MPa. The refrigerant is now cooled and condensed at constant pressure until the temperature drops to 20 C. Determine the entropy change of the refrigerant during this process. 7–39 An insulated piston–cylinder device contains 0.05 m3 of saturated Depends on what size compressor it has, it sould be listed on the ID tag located on the back of the machine, mine says 12oz.of R12, if you aren't using R12, then follow the recomendations of the replacement refrigerant manufacture, usually you can find this out at the web site of that replacement refrigerant manfacture...
Where refrigerant control requires a reasonably constant condensing pressure, some form of capacity control is required. Fan Cycling. Fan cycling is the simplest method of capacity control on evaporative condensers. This method can result in relatively large fluctuations in condensing pressures, however. Mar 26, 2018 · Refrigerants for freezers include Puron, Suva and Genetron. There is no ideal refrigerant on the market that has the desired thermodynamic properties, is easy to make and doesn't pose any human or environmental hazards. refrigerant inappropriate for retrofit of existing R-22 systems. Another important issue is the compatibility of the compressor lubricant with the azeotropic R-410A mixture.To ensure satisfactory operation and durabil-ity, a polyolester-based lubricant that is miscible withDesirable properties. The ideal working fluid or often called refrigerant would have favorable thermodynamic properties, be noncorrosive to mechanical components, and be safe, including freedom from toxicity and flammability.It would not cause ozone depletion or climate change.Since different fluids have the desired traits in different degree, choice is a matter of trade-offs.
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