Freon-12 vapor compression jet pump solar cooling system

Abstract

A vapor compression jet pump solar cooling system is examined. A one-dimensional analysis of the jet pump for use in solar cooling systems is presented. A computer model of the jet pump solar cooling system is developed. An actual working model of the system for a cooling load of 7000 Btu's/hr is designed, built and tested. In both the computer and actual working model, Freon-12 (R-12) was selected to be both primary fluid and the refrigerant of the system. In determining the performance of the system, first the jet pump by itself (without refrigerant flow) was tested. Then the coefficient of performance (COP) tests were conducted for a primary fluid (as a saturated vapor), condenser, and evaporator temperatures ranging between 130(DEGREES)F - 180(DEGREES)F, 80(DEGREES)F - 115(DEGREES)F, 15(DEGREES)F - 64(DEGREES)F, respectively. In most cases, the COP decreases by increasing the condenser pressure, and increases with increasing inlet pressure of the primary fluid and evaporator temperature. At 80(DEGREES)F condenser temperatures, the COP's at low inlet temperatures of the primary fluid were higher than those obtained for higher inlet temperatures of the primary fluid operations. The best COP's were obtained at 150(DEGREES)F inlet temperatures. At higher condenser temperatures (95(DEGREES)F and above), the low inlet temperature of the primary fluid operations (150(DEGREES)F and below) failed to provide sufficient cooling, therefore, one is forced to operate the system at higher inlet temperatures (160(DEGREES) and above). In determining COP's, in most cases, the condenser temperature played a greater role than the evaporator temperature....