Homework Answers
Given things
Tc = 49 C = 322 K
Te = -12 C = 261 K
The coefficient of performance of heat pump is
the coefficient of performance of the refrigeration is
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V6.23 Figure P6.23 shows a Carnot heat pump cycle operating at steady state with ammonia as...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 °C. There...
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...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
Figure 12.1 is a schematic of a heat pump operating at steady state with R-134a as...
Figure 12.1 is a schematic of a heat pump operating at steady state with R-134a as the working fluid. The mass flow rate of the refrigerant is 7 kg/min, and the power input to the compressor is 5.17 kW. Determine a) The coefficient of performance, y b) If the valve were replaced by a turbine, what would be the maximum power generated by the turbine c) Based on your answer to b) would you recommend the replacement of a throttle...
A vapor- compression heat pump uses ammonia to provide heat with a geothermal source of heat...
A vapor- compression heat pump uses ammonia to provide heat with a geothermal source of heat at 50oF. The heat pump condenser operates at 72oF while the evaporator is at 48oF. Assuming an ideal dry compression cycle and for a heating of 7 tons (refrigeration unit) determine the power required of the compressor and the flow rate of ammonia.
A Carnot vapor refrigeration cycle is used to maintain a cold region at 0 ?F where...
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
Problem 15. A heat pump is used to maintain a warm area at 30 degC by...
Problem 15. A heat pump is used to maintain a warm area at 30 degC by transferring heat from surroundings at-20 degC. The heat pump is assumed to operate as an Ideal Vapor Compression Cycle Cycle Conditions TH= 30-degC TL--20-degC T1 30-degC h- 241.8 kJ-kg T2 T3-20degC h 386.8 kJ-kg S 1.7422 kJ.kg K h 423.1.kJ.kg T,-37.8-degC A. Determine that heat rejected (in kJ/kg) by the refrigerant in the condenser Condenser Compressor Expansion Valve Evaporator COMP Assume p4 - p1...
Find a) compressor power, b) heat transfer Refrigeration/Heat Pump Cycle rate to the condenser and c)...
Find a) compressor power, b) heat transfer Refrigeration/Heat Pump Cycle rate to the condenser and c) heat transfer arte to the evaporator P2 800 kPa 2 3 P 800 kPa T2= 80°C Condenser Saturated Assumptions: SSSF, throttle valve and vapour compressor, c) negligible change in kinetic energy and negligible change in potential a COND Expansion/ Throttle W COMP R-134a m 1.5 kg/s Compressor energy valve Evaporator T1=-26.3 °C 1 4-26.3 C Saturated vapour EVAP
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant...
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...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant...
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 190°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 50 kW, determine: (a) the mass flow rate of the refrigerant, in kg/s. (b) the power input to the...
An ideal vapor-compression heat pump cycle using R-134a is used to heat a house. The inside...
An ideal vapor-compression heat pump cycle using R-134a is used to heat a house. The inside temperature is 22 ℃; the outside temperature is 0 ℃ Saturated vapor at 2.2 bar enters the compressor, and saturated liquid leaves the condenser at 3 ba. The mass ow rate is 0.2 kg/s. Detemine: a the power iput to the compressor (in kw) b. the coefficient of performance c. the coefficient of performance if the system were used as a refrigeration cycle d....
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...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
Figure 12.1 is a schematic of a heat pump operating at steady state with R-134a as the working fluid. The mass flow rate of the refrigerant is 7 kg/min, and the power input to the compressor is 5.17 kW. Determine a) The coefficient of performance, y b) If the valve were replaced by a turbine, what would be the maximum power generated by the turbine c) Based on your answer to b) would you recommend the replacement of a throttle...
Problem 15. A heat pump is used to maintain a warm area at 30 degC by transferring heat from surroundings at-20 degC. The heat pump is assumed to operate as an Ideal Vapor Compression Cycle Cycle Conditions TH= 30-degC TL--20-degC T1 30-degC h- 241.8 kJ-kg T2 T3-20degC h 386.8 kJ-kg S 1.7422 kJ.kg K h 423.1.kJ.kg T,-37.8-degC A. Determine that heat rejected (in kJ/kg) by the refrigerant in the condenser Condenser Compressor Expansion Valve Evaporator COMP Assume p4 - p1...
Find a) compressor power, b) heat transfer Refrigeration/Heat Pump Cycle rate to the condenser and c) heat transfer arte to the evaporator P2 800 kPa 2 3 P 800 kPa T2= 80°C Condenser Saturated Assumptions: SSSF, throttle valve and vapour compressor, c) negligible change in kinetic energy and negligible change in potential a COND Expansion/ Throttle W COMP R-134a m 1.5 kg/s Compressor energy valve Evaporator T1=-26.3 °C 1 4-26.3 C Saturated vapour EVAP
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...
An ideal vapor-compression heat pump cycle using R-134a is used to heat a house. The inside temperature is 22 ℃; the outside temperature is 0 ℃ Saturated vapor at 2.2 bar enters the compressor, and saturated liquid leaves the condenser at 3 ba. The mass ow rate is 0.2 kg/s. Detemine: a the power iput to the compressor (in kw) b. the coefficient of performance c. the coefficient of performance if the system were used as a refrigeration cycle d....
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