MECHENG 235 Lecture Notes - Thermal Efficiency, Heat Capacity, Thermodynamics
29 Apr 2014
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Me 235 thermodynamics i / winter 2014 / section 002. 9. 89 a refrigerator receives 500 w of electrical power to the compressor driving the cycle flow of r-134a. The refrigerator operates with a condensing temperature of 40 c and a low temperature of -5 c. Cop for the cycle and its cooling capacity. 9. 104 a small heat pump unit is used to heat water for a hot-water supply. Assume that the unit uses ammonia and operates on the ideal refrigeration cycle. The evaporator temperature is 15 c and the condenser temperature is 60 c. If the amount of hot water needed is 0. 1 kg/s, determine the amount of energy saved by using the heat pump instead of directly heating the water from 15 to 60 c. 10. 67 a 4 stroke gasoline engine runs at 1800 rpm with a total displacement of 3l and a compression ratio of 10:1.
