Investigation of vapor cycles using freon 11 and cycles using water as refrigerants for space vehicle cabin cooling at approximately 75°F and electronic equipment cooling at approximately 150°F revealed similar performance in the two refrigerants, but due to the high compression ratios required, water was undesirable. Optimum total radiator area for the combination of vapor cycle systems with necessary power units resulted at 250°F to 325°F radiator temperature for cabin cooling and 270°F to 350°F for electronic equipment cooling (temperatures were based on a power efficiency of 20 percent and heat rejection or radiator temperature of 700°F). High power unit efficiencies, high power unit radiator temperatures, and high cooling system Carnot cycle efficiencies reduced radiator area.
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