A vapor compression cycle using R134a as the refrigerant operates with evaporating and condensing temperatures of...
A vapor compression cycle using R134a as the
refrigerant operates with evaporating and condensing
temperatures of -5°C and 40°C. Calculate (i) Carnot cycle
compression work, (ii) excess work due to the ‘superheat
horn’,
(iii) the loss of work due to throttling, and (iv) the loss
in
refrigeration capacity due to throttling.
Homework Answers
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A vapor compression cycle using R134a as the
refrigerant operates with evaporating and condensing
temperatures of...
ler SHVAC SV Ref Cycles lGalgillg Worked Examples Example 3.4 The evaporator and condenser temperatures of...
ler SHVAC SV Ref Cycles lGalgillg Worked Examples Example 3.4 The evaporator and condenser temperatures of a standard vapor compression cycle using R134a as the refrigerant are -5°C and 40°C respectively. The isentropic efficiency of the adiabatic compressor is 75% and the refrigeration capacity is 25 kW. Calculate () the refrigerant flow rate, () the compressor work input, and (ii) the COP Solution The T-s diagram of the vapor compression cycle is shown in Fig. E3.5. For purposes of comparison...
solve problem below by replacing R134a with ammonia (and explain each step please) A SSS vapour...
solve problem below by replacing R134a with ammonia (and explain each step please) A SSS vapour compression refrigeration system based on refrigerant R 134a, operates between an evaporator temperature of -25 °C and a condenser temperature of 50°C . Assuming isentropic compression draw t-s and p-h diagram a) COP of the system b) Work input to compressor c) Area of superheat horn d) Throttling loss ▪ assume the isobar at condenser to coincide with saturated liquid line.
1. An air conditioning plant using refrigerant R 134a has evaporating and condensing temperatures of 0°C...
1. An air conditioning plant using refrigerant R 134a has evaporating and condensing temperatures of 0°C and 35°C, respectively. a) Calculate the refrigerating effect for the plant. If the duty is 352 kW of refrigeration, determine the mass flow rate of refrigerant. b) c) What is the volumetric flow rate under suction conditions? d) Calculate the work done in the compression and the corresponding compressor power e) Evaluate the heat rejected and the rate of heat rejection. f) Calculate the...
Problem-3 (200) In a vapor-compression refrigeration cycle, R134a exits the evaporator as saturated vapor at -32°C....
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,...
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigerat...
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Show the cycle on a T-s diagram with respect to saturation lines and determine (a) the quality of the refrigerant at the end of the throttling process, (b) coefficient of performance, (c) the power input to the compressor , (d) Generation of entropy...
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle....
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.019 kg/s. The (actual) refrigerator has a compressor with an isentropic efficiency of 85%. The refrigerant enters the compressor slightly superheated by 56 C hint add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.9°C. What is the rate of...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant,...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant, with a cooling capacity of 500 kW; compressor of 70% efficiency, with a superheat of 10°C before compressor inlet; operation temperature of -10°C inside the refrigerator, with the environment temperature of 25°C outside the refrigerator; Determine the pressure range of refrigeration cycle if a 10°C difference is required to ensure effective heat transfer of evaporator and condenser; Plot the refrigeration cycle on P-h diagram;...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
Problem 2: Consider a vapor compression cycle uses ammonia as a refrigerant and follows the theoretical...
Problem 2: Consider a vapor compression cycle uses ammonia as a refrigerant and follows the theoretical single-stage cycle. The condensing temperature is 100 F and the evaporating temperature is 0 F What is the low and high pressures in the cycle? Plot all points entering and exiting cach of the evaporator, compressor, condenser, and expansion valve on a P-h diagram and submitted with you work. Determine the enthalpy of the refrigerant leaving the compressor. Detemine the enthalpy of the refrigerant...
An ideal vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid....
An ideal vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 1.25 bar, and saturated liquid exits the condenser at 5 bar. The mass flow rate of refrigerant is 8.5 kg/min. A. Determine the magnitude of the compressor power input required, in kW (report as a positive number). B. Determine the refrigerating capacity, in tons. C. Determine the coefficient of performance. Please answer all parts of the question. Thanks!
ler SHVAC SV Ref Cycles lGalgillg Worked Examples Example 3.4 The evaporator and condenser temperatures of a standard vapor compression cycle using R134a as the refrigerant are -5°C and 40°C respectively. The isentropic efficiency of the adiabatic compressor is 75% and the refrigeration capacity is 25 kW. Calculate () the refrigerant flow rate, () the compressor work input, and (ii) the COP Solution The T-s diagram of the vapor compression cycle is shown in Fig. E3.5. For purposes of comparison...
1. An air conditioning plant using refrigerant R 134a has evaporating and condensing temperatures of 0°C and 35°C, respectively. a) Calculate the refrigerating effect for the plant. If the duty is 352 kW of refrigeration, determine the mass flow rate of refrigerant. b) c) What is the volumetric flow rate under suction conditions? d) Calculate the work done in the compression and the corresponding compressor power e) Evaluate the heat rejected and the rate of heat rejection. f) Calculate the...
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,...
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Show the cycle on a T-s diagram with respect to saturation lines and determine (a) the quality of the refrigerant at the end of the throttling process, (b) coefficient of performance, (c) the power input to the compressor , (d) Generation of entropy...
(12 points) A refrigerator using refrigerant-134a as the working fluid operates on the vapor compression cycle. The cycle operates between 200 kPa and 1.2 MPa. The refrigerant flows through the cycle at a rate of 0.019 kg/s. The (actual) refrigerator has a compressor with an isentropic efficiency of 85%. The refrigerant enters the compressor slightly superheated by 56 C hint add this to the saturation temperature). The refrigerant leaves the condenser slightly subcooled by 1.9°C. What is the rate of...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
Problem 2: Consider a vapor compression cycle uses ammonia as a refrigerant and follows the theoretical single-stage cycle. The condensing temperature is 100 F and the evaporating temperature is 0 F What is the low and high pressures in the cycle? Plot all points entering and exiting cach of the evaporator, compressor, condenser, and expansion valve on a P-h diagram and submitted with you work. Determine the enthalpy of the refrigerant leaving the compressor. Detemine the enthalpy of the refrigerant...
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