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1. MULTI-STAGE COMPRESSION AND EXPANSION The following data refer to a two stage vapour compression system:...
(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...
1. An industrial freezer uses a multi-stage vapor-compression cycle with R-134a as the working fluid. The...
1. An industrial freezer uses a multi-stage vapor-compression cycle with R-134a as the working fluid. The evaporator operates at 140 kPa, the condenser at 1600 kPa, and the flash chamber 600 kPa. The refrigerant leaves the evaporator as a super-heated vapor at -15°C, and leaves the condenser as a sub-cooled liquid at 50°C. Both compressors used in the system have isentropic efficiencies of 85%. For a cooling load of 25 kW, (a) What is the mass flow rate of refrigerant...
Problem 2 (30 pts): Consider a two-stage vapor-compression refrigeration system operating between the pressure limits of...
Problem 2 (30 pts): Consider a two-stage vapor-compression refrigeration system operating between the pressure limits of 1.5 MPa and 150 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. The mass flow rate of the refrigerant through the low pressure compressor is 0.15 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor, determine (a) the mass flow rate of the...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator pressure Temperature at compressor inlet Temperature at compressor outlet Temperature at condenser inlet Temperature at condenser outlet Temperature at expansion valve inlet 30 Temperature at evaporator outlet 0.9 MPa 0.6 MPa 30 C 120 C 110 C 25 C 20 °C During compression, 3.5 kJ/kg was transferred from the fluid. Determine the coefficient of performance and perform an energy balance on the system
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...
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...
(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...
Problem 2 (30 pts): Consider a two-stage vapor-compression refrigeration system operating between the pressure limits of 1.5 MPa and 150 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.45 MPa. The mass flow rate of the refrigerant through the low pressure compressor is 0.15 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor, determine (a) the mass flow rate of the...
4. The following test data were obtained from a R134A vapour-compression refrigeration system Condenser pressure Evaporator pressure Temperature at compressor inlet Temperature at compressor outlet Temperature at condenser inlet Temperature at condenser outlet Temperature at expansion valve inlet 30 Temperature at evaporator outlet 0.9 MPa 0.6 MPa 30 C 120 C 110 C 25 C 20 °C During compression, 3.5 kJ/kg was transferred from the fluid. Determine the coefficient of performance and perform an energy balance on the system
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...
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...
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