A refrigeration system which uses R 134 is to be constructed to produce refrigeration at 20ºF with a capacity of 20 Tons and also at 40 ºF with a capacity of 15 Tons. The condensing temperature is to be 95ºF. The system is to have two compressors and a flash tank. The schematic is shown in Figure:
a) Sketch and label in a T –S and P – h diagram for the system.
b) Calculate the COP for the system
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A refrigeration system which uses R 134 is to be constructed to produce refrigeration at 20ºF with a capacity of 20 Tons and also at 40 ºF with a capacity of 15 Tons. The condensing temperature is to...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called the Economizer 2-Stage Refrigeration Cycle). Comparing to the cascade two-stage refrigeration system discussed in In-class Activity #10a, in this case, the flash chamber (now called Flash Intercooler) is still used but the mixing chamber is removed. The superheated vapor (2) out of the low-pressure compressor (1) is routed into the flash chamber, and the saturated vapor (3) out of the flash chamber enters directly...
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with...
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with refrigerant-134a. The fluid leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.50 MPa. Part of the refrigerant evaporates in the flashing process, and this vapor is mixed with the refrigerant leaving the low-pressurin compressor. The liguid in the flash chamber iS throttled to the evaporator pressure and cools the refrigerated space. The mass flow rate of...
The system shown in the diagram provides 20tons of refrigeration. The system uses 134-a refrigerant. Using...
The
system shown in the diagram provides 20tons of refrigeration. The
system uses 134-a refrigerant. Using the data indicated on the
diagram.
A) find the minimum work requirement to the compressor
B) compute the coefficient of performance
C) determine the coefficient of performance of a Carnot
refrigerator operating between the temperature limits of this
system
D) show the cycle on a properly labeled T-s diagram with
respect to the saturation lines.
(On the diagram, lets say compressor to the condenser...
DI/ A two-stage vapor compression cycle with 15 TR (refrigeration capacity) using ammonia as a refigerant...
DI/ A two-stage vapor compression cycle with 15 TR (refrigeration capacity) using ammonia as a refigerant is carried out with water and flash inter-cooling and water sub-cooling as shown in figure 1 The operating pressure of the condenser is 12 bars, and the evaporator is 3 bars, while the flash tank operating pressure is 6 bars. The limiting temperature for inter-cooling and sub-cooling is 20 °C. Draw the cycle on p-H diagram showing all points, and then find the power...
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid....
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. The system operates the evaporator at 0.4 MPa, the condenser at 1.6 MPa, and the separator at 0.8 MPa. The compressors use 25 kW of power. Given that the refrigerant is saturated liquid at the inlet of each expansion valve and saturated vapor at the inlet of each compressor, and the compressors are isentropic: (0) show the process on a T-s diagram; ) calculate...
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...
Part A Consider an ideal two-stage refrigeration system (Figure 1) that uses R-12 as the working...
Part A Consider an ideal two-stage refrigeration system (Figure 1) that uses R-12 as the working fluid. Saturated liquid leaves the condenser at 40 °C and is throttled to -20 °C. The liquid and vapor at this temperature are separated, and the liquid is throttled to the evaporator temperature at -70 °C. Vapor leaving the evaporator is compressed to the saturation pressure corresponding to -20 °C, after which it is mixed with the vapor leaving the flash chamber. Use TESTCalc...
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 h...
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...
Question 4 A refrigeration system operating on R22, experiences liquid knock during start-up. You suspect that...
Question 4 A refrigeration system operating on R22, experiences liquid knock during start-up. You suspect that one of the causes could be that the wrong expansion valve was selected/ The following information is available (a) Refrigeration capacity: 80 kVw (b) Suction pressure measured at compressor: 350 kPa (abs) (c) Condensing pressure : 1600 kPa (d) Temperature of liquid leaving condenser : 40°C (e) Neglect pressure drop in condenser and evaporator (f) Pressure drop across distributor and evaporator 170 kPa (g)...
Consider a cascade system that uses vapor compression refrigeration for both high and low temperature cycles....
Consider a cascade system that uses vapor compression refrigeration for both high and low temperature cycles. Saturated vapor ammonia enters the compressor in the low temperature cycle at 20 psi and exits at 90 psi as it enters the heat exchanger. R134a enters the compressor in the high temperature cycle at 20oF and a quality of 0.84, and exits at 120 psi as it enters the high temperature condenser. Given a refrigeration capacity of 10 tons, determine: Ratio of the...
(100 points) Figure below shows the schematic diagram of a two-stage cascade refrigeration system (also called the Economizer 2-Stage Refrigeration Cycle). Comparing to the cascade two-stage refrigeration system discussed in In-class Activity #10a, in this case, the flash chamber (now called Flash Intercooler) is still used but the mixing chamber is removed. The superheated vapor (2) out of the low-pressure compressor (1) is routed into the flash chamber, and the saturated vapor (3) out of the flash chamber enters directly...
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with refrigerant-134a. The fluid leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.50 MPa. Part of the refrigerant evaporates in the flashing process, and this vapor is mixed with the refrigerant leaving the low-pressurin compressor. The liguid in the flash chamber iS throttled to the evaporator pressure and cools the refrigerated space. The mass flow rate of...
The
system shown in the diagram provides 20tons of refrigeration. The
system uses 134-a refrigerant. Using the data indicated on the
diagram.
A) find the minimum work requirement to the compressor
B) compute the coefficient of performance
C) determine the coefficient of performance of a Carnot
refrigerator operating between the temperature limits of this
system
D) show the cycle on a properly labeled T-s diagram with
respect to the saturation lines.
(On the diagram, lets say compressor to the condenser...
DI/ A two-stage vapor compression cycle with 15 TR (refrigeration capacity) using ammonia as a refigerant is carried out with water and flash inter-cooling and water sub-cooling as shown in figure 1 The operating pressure of the condenser is 12 bars, and the evaporator is 3 bars, while the flash tank operating pressure is 6 bars. The limiting temperature for inter-cooling and sub-cooling is 20 °C. Draw the cycle on p-H diagram showing all points, and then find the power...
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. The system operates the evaporator at 0.4 MPa, the condenser at 1.6 MPa, and the separator at 0.8 MPa. The compressors use 25 kW of power. Given that the refrigerant is saturated liquid at the inlet of each expansion valve and saturated vapor at the inlet of each compressor, and the compressors are isentropic: (0) show the process on a T-s diagram; ) calculate...
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...
Part A Consider an ideal two-stage refrigeration system (Figure 1) that uses R-12 as the working fluid. Saturated liquid leaves the condenser at 40 °C and is throttled to -20 °C. The liquid and vapor at this temperature are separated, and the liquid is throttled to the evaporator temperature at -70 °C. Vapor leaving the evaporator is compressed to the saturation pressure corresponding to -20 °C, after which it is mixed with the vapor leaving the flash chamber. Use TESTCalc...
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...
Question 4 A refrigeration system operating on R22, experiences liquid knock during start-up. You suspect that one of the causes could be that the wrong expansion valve was selected/ The following information is available (a) Refrigeration capacity: 80 kVw (b) Suction pressure measured at compressor: 350 kPa (abs) (c) Condensing pressure : 1600 kPa (d) Temperature of liquid leaving condenser : 40°C (e) Neglect pressure drop in condenser and evaporator (f) Pressure drop across distributor and evaporator 170 kPa (g)...
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