(C) The diagram shows an ordinary vapor compression cycle for refrigeration. When the evaporator pressure increases but saturated vapor still leaves the evaporator, the coefficient of performance _____. (5 points) pressure (MPa) 5 1 4 condenser 3 0.5 liquid vapor evaporator 1 2 0.1 150 200 250 2- phase 300 350 400 450 500 A. Increases B. Decreases C. Does not change enthalpy (kJ/kg)
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This can happen if the temperature of the evaporator increases or if the pressure in the system increases. If saturated vapor still leaves the evaporator, it means that the refrigerant is still in the vapor phase when it exits the evaporator. This indicates that Show more…
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A Carnot vapor refrigeration cycle is used to maintain a cold region at $4^{\circ} \mathrm{C}$ when the ambient temperature is $32^{\circ} \mathrm{C}$. Refrigerant $134 \mathrm{a}$ enters the condenser as saturated vapor at $965 \mathrm{kPa}$ and leaves as saturated liquid at the same pressure. The evaporator pressure is $276 \mathrm{kPa}$. The mass flow rate of refrigerant is $0.05 \mathrm{~kg} / \mathrm{s}$. Calculate (a) the compressor and turbine power, each in $\mathrm{kW}$. (b) the coefficient of performance.
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In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -10°C. The refrigerant enters the condenser at 16 bar and 160°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating capacity is 150 kW, determine (a) the mass flow rate of refrigerant, in kg/s (b) the power input to the compressor, in kw (c) the coefficient of performance (d) the isentropic compressor efficiency Round answers to 3 significant digits. (a) 0,1444 (b) 52.99 (c) 2.83 (d) 88.26
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An ideal vapor-compression refrigeration cycle operates at a steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at -10°C, and saturated liquid leaves the condenser at 28°C. The mass flow rate of refrigerant is 5 kg/min. Show the process on a T-S diagram, labeling the two temperatures on the y-axis, and determine: (a) The compressor power, in kW. (b) The refrigerating capacity (Q̇in), in tons (1 ton = 211 kJ/min). (c) The coefficient of performance. Take: h_evaporator,out = h_compressor,in = 241.35 kJ/kg h_compressor,out = h_condenser,in = 267.9 kJ/kg h_valve,out = h_evaporator,in = 88.61 kJ/kg
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