A Carnot vapor refrigeration cycle is used to maintain a cold region at 0 ?F where the ambient temperature is 75 ?F. Refrigerant R-134a enters the condenser as saturated vapor at 100 lbf/in2 and leaves as saturated liquid at the same pressure. The evaporator pressure is 20 lbf/in2. The mass flow rate of refrigerant is 13 lbm/s . a-compressor power b-turbine power c- coefficient of performance
A Carnot vapor refrigeration cycle is used to maintain a cold region at 0 ?F where...
A vapor compression refrigeration system operates at steady state with refrigerant 134a as the working fluid. Superheated vapor enters the compressor at 10 lbf/in2 , 0 oF. The liquid leaving the condenser is at 180 lbf/in2 , 100 oF. There is no significant pressure drop in the evaporator or condenser. For compressor efficiency of 83% and refrigeration capacity of 6 tons, determine (a) the compressor power input in horsepower, and (b) the coefficient of performance. A vapor compression refrigeration system...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 °C. There are irreversibilities in the compressor. 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. Calculate the coefficient of performance, b, and the isentropic compressor efficiency, defined as: 2s Condenser Expansion...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as shown. Refrigerant 134a leaves the evaporator as saturated vapor at 0.10 MPa and is heated at constant pressure to 20°C before entering the compressor. Following isentropic compression to 1.4 MPa, the refrigerant passes through the condenser and exits at 45°C and 1.4 MPa. The liquid then passes through the heat exchanger and enters the expansion valve at 1.4 MPa. The mass flow rate of...
Thermodynamics. No interpolation needed. Problem #3. Refrigerant 134a is the working fluid for vapor-compression refrigeration cycle. The evaporator temperature is 8°C and the condenser pressure is 12 bar. Saturated vapor enters the compressor and superheated vapor enters the condenser at 60°C and exits the condenser as saturated liquid. For a refrigeration capacity of 8 tons or 2.816 x104 J/s determine the following: (1) The refrigerant mass flow rate in kg/s; (2) The compressor isentropic efficiency [Hint: Interpolation is required); (3)...
A vapor-compression refrigeration system which operates on the cascade cycle arrangement shown below is used to obtain refrigeration at a low temperature. Refrigerant-12 is the working fluid in the high-temperature cycle and Refrigerant-13 is used in the low-temperature cycle. For the Refrigerant 13 cycle, the working fluid enters the compressor as saturated vapor at -30°F and is compressed isentropically to 250 lbf/in2. Saturated liquid leaves the intermediate heat exchanger at 250 lbf/in2 and enters the expansion valve. For the Refrigerant...
An ideal vapor-compression refrigeration cycle with R-134a as the working fluid has an evaporator temperature of-15 °C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3.5 kg/min. Draw and label the cycle on a T-s diagram. What is the coefficient of performance? Ans. 2.98 What is the refrigerating capacity in tons? a. b. c.
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
Problem-3 (200) In a vapor-compression refrigeration cycle, R134a exits the evaporator as saturated vapor at -32°C. The refrigerant enters the condenser at 14 bar and 170°C, and saturated liquid exits at 14 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 mass flow rate is 2.987 kg/s, determine (a) Refrigeration capacity in KW (100) (b) The power input to the compressor,...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°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 the refrigerant, in kg/s. (b) the power input to the...