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4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator...
R134a refrigerant In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2...
R134a refrigerant
In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2 bar. Evaporator pressure 0.02 MPa. Sub-cooling 10°C. Super heating 20°C. Estimate the power consumed by compressor, heat absorbed in evaporator, heat rejected in condenser and coefficient of performance. Mark all given data in PH and TS 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...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as...
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...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. Th...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. The refrigerant leaves the condenser as saturated liquid and is throttled to a flash chamber operating at 0.5 MPa. The refrigerant leaving the low-pressure compressor at 0.5 MPa is also routed to the flash chamber. The vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquidis throttled to the evaporator pressure. Assume...
Exercise 4 In the ideal vapour-compression refrigerator using refrigerant 134a, the evaporator temperature is -20 C,...
Exercise 4 In the ideal vapour-compression refrigerator using refrigerant 134a, the evaporator temperature is -20 C, and the inlet temperatu enters the compressor. Calculate: re to the condenser is 30°C. Saturated vapour a. The work of the compressor b. The heat transfer from the condenser c. The heat transfer to the evaporator d. The coefficient of performance
The coefficient of performance-of vapor-compression refrigeration cycles
a) The coefficient of performance-of vapor-compression refrigeration cycles improves when the refrigerant is subcooled before it enters the throttling valve Can the refrigerant be subcooled indefinitely to maximize this effect, or is there a lower limit? Explain brieflyb) A two-stage compression refrigeration system with a flash chamber is used to produce chilled water for a commercial building The refrigeration system operates between a pressure limits of 1 2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves...
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...
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,...
1. MULTI-STAGE COMPRESSION AND EXPANSION The following data refer to a two stage vapour compression system:...
1. MULTI-STAGE COMPRESSION AND EXPANSION The following data refer to a two stage vapour compression system: Condensing temperature Flash intercooler temperature Evaporating temperature Refrigerant used Refrigerant flow through H.P. side Condensate is sub - cooled in condenser 40 C 15 C -15 C R-717 (NH3) 0.4 kg.s by 5 C 80% each Compression efficiencies Determine the following: (i) Flow rate through evaporator (ii) Tonnes of refrigeration (iii) Total power input (iv) Co-efficient of performance (v) Heat transfer to condenser HPC....
A vapo the condenser is saturated liquid with an enthalpy of 220 kJ/kg. The outlet stream of the ...
A vapo the condenser is saturated liquid with an enthalpy of 220 kJ/kg. The outlet stream of the evaporator has a absolute pressure of 0.1 MPa, and is superheated vapor that is 30 °C above the dew point. a) (7 points) If the outlet stream of the compressor is superheated vapor at 90 °C, what is the efficiency of the compressor? AH H3- H2, (AH)s - H3-H2 b) (6 points) Calculate the coefficient of performance for this refrigerator r-compression refrigeration...
R134a refrigerant
In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2 bar. Evaporator pressure 0.02 MPa. Sub-cooling 10°C. Super heating 20°C. Estimate the power consumed by compressor, heat absorbed in evaporator, heat rejected in condenser and coefficient of performance. Mark all given data in PH and TS diagram.
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...
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...
A refrigeration system with a flash chamber operates with R134a between the pressure limits of 1.0 and 0.1 MPa. The refrigerant leaves the condenser as saturated liquid and is throttled to a flash chamber operating at 0.5 MPa. The refrigerant leaving the low-pressure compressor at 0.5 MPa is also routed to the flash chamber. The vapor in the flash chamber is then compressed to the condenser pressure by the high-pressure compressor, and the liquidis throttled to the evaporator pressure. Assume...
Exercise 4 In the ideal vapour-compression refrigerator using refrigerant 134a, the evaporator temperature is -20 C, and the inlet temperatu enters the compressor. Calculate: re to the condenser is 30°C. Saturated vapour a. The work of the compressor b. The heat transfer from the condenser c. The heat transfer to the evaporator d. The coefficient of performance
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...
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,...
1. MULTI-STAGE COMPRESSION AND EXPANSION The following data refer to a two stage vapour compression system: Condensing temperature Flash intercooler temperature Evaporating temperature Refrigerant used Refrigerant flow through H.P. side Condensate is sub - cooled in condenser 40 C 15 C -15 C R-717 (NH3) 0.4 kg.s by 5 C 80% each Compression efficiencies Determine the following: (i) Flow rate through evaporator (ii) Tonnes of refrigeration (iii) Total power input (iv) Co-efficient of performance (v) Heat transfer to condenser HPC....
A vapo the condenser is saturated liquid with an enthalpy of 220 kJ/kg. The outlet stream of the evaporator has a absolute pressure of 0.1 MPa, and is superheated vapor that is 30 °C above the dew point. a) (7 points) If the outlet stream of the compressor is superheated vapor at 90 °C, what is the efficiency of the compressor? AH H3- H2, (AH)s - H3-H2 b) (6 points) Calculate the coefficient of performance for this refrigerator r-compression refrigeration...
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