Q: A steady-flow Carnot refrigeration cycle uses refrigerant-134a as
A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapor to saturated liquid at 60°C in the condenser as it rejects heat. The e...
See AnswerQ: Refrigerant-134a enters the condenser of a steady-flow Carnot
Refrigerant-134a enters the condenser of a steady-flow Carnot refrigerator as a saturated vapor at 90 psia, and it leaves with a quality of 0.05. The heat absorption from the refrigerated space takes...
See AnswerQ: Does the ideal vapor-compression refrigeration cycle involve any internal irreversibilities
Does the ideal vapor-compression refrigeration cycle involve any internal irreversibilities?
See AnswerQ: Why is the throttling valve not replaced by an isentropic turbine in
Why is the throttling valve not replaced by an isentropic turbine in the ideal vapor-compression refrigeration cycle?
See AnswerQ: In a refrigeration system, would you recommend condensing the refrigerant-
In a refrigeration system, would you recommend condensing the refrigerant-134a at a pressure of 0.7 or 1.0 MPa if heat is to be rejected to a cooling medium at 15°C? Why?
See AnswerQ: An air-standard cycle with variable specific heats is executed in
An air-standard cycle with variable specific heats is executed in a closed system with 0.003 kg of air and consists of the following three processes: 1-2 v = constant heat addition from 95 kPa and 17°...
See AnswerQ: A large fraction of the thermal energy generated in the engine of
A large fraction of the thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water. Should the radiator be analyzed as a closed system or as a...
See AnswerQ: Does the area enclosed by the cycle on a T-s
Does the area enclosed by the cycle on a T-s diagram represent the net work input for the reversed Carnot cycle? How about for the ideal vapor-compression refrigeration cycle?
See AnswerQ: Consider two vapor-compression refrigeration cycles. The refrigerant enters the
Consider two vapor-compression refrigeration cycles. The refrigerant enters the throttling valve as a saturated liquid at 30°C in one cycle and as subcooled liquid at 30°C in the other one. The evapor...
See AnswerQ: It is proposed to use water instead of refrigerant-134a as
It is proposed to use water instead of refrigerant-134a as the working fluid in air-conditioning applications where the minimum temperature never falls below the freezing point. Would you support this...
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