Engineering, 14.09.2019 01:30 34267
Refrigerant r-12 is used in a carnot refrigerator
operatingbetween saturated liquid and vapor during the heat
rejectionprocess. if the cycle has a high temperature of 50 deg c
and a lowtemperature of -20 deg c, find the heat transferred from
therefrigerated space, the work required, the coefficient
ofperformance and the quality at the beginning of the heat
additioncycle.
Answers: 2
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Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
Refrigerant r-12 is used in a carnot refrigerator
operatingbetween saturated liquid and vapor...
operatingbetween saturated liquid and vapor...
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