An ideal gas refrigeration system operates with air as the working fluid. Air is at 100...
An ideal gas refrigeration system operates with air as the working fluid. Air is at 100 kPa and 20°C before compression and 500 kPa and 30°C before expansion. The system is to provide 15 kW of cooling. Calculate the rate at which air is circulated in this system, as well as the rates of heat addition and rejection. Use constant specific heats at room temperature.
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An ideal gas refrigeration system operates with air as the
working fluid. Air is at 100...
An ideal Otto cycle with air as the working fluid has a compression ratio of 7....
An ideal Otto cycle with air as the working fluid has a compression ratio of 7. At the beginning of the compression process, air is at 90 kPa and 27°C, and volume of the cylinder v1 = 0.004 m3. The maximum cycle temperature is 1127°C. Taking into account constant specific heats at room temperature, determine, a) the heat rejection (2) b) the net work output (2) c) the thermal efficiency, and (2) d) the mean effective pressure for the cycle...
(6) Gas Refrigeration Air is the working fluid of a Brayton refrigeration cycle with a compressor...
(6) Gas Refrigeration Air is the working fluid of a Brayton refrigeration cycle with a compressor pressure ratio of 3. At the beginning of the compression, the temperature Ti = 270 K and pressure P1 = 140 kPa. The turbine inlet temperature is T3 = 320 K. You may assume both heat exchangers operate without pressure losses. Draw a T-s diagram for this ideal cycle. If the volumetric flow rate at State 3 is 0.4 m3/s, what is the mass...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 25 psia and 140 psia. Determine (on a per unit mass basis) the heat transfer rates, the power required, and the COP.
Problem 7: (15 pts) An ideal air-standard Brayton cycle operates steadily with pressure limits of the...
Problem 7: (15 pts) An ideal air-standard Brayton cycle operates steadily with pressure limits of the cycle are 100 kPa and 800 kPa. The temperature at the exit of turbine is 500 K. During the heat rejection process, heat is released from the cycle at a rate of 320 kW and the mass flow rate is 2 kg/s. The air is treated as an ideal gas with constant specific heats, i.e. k = 1.4 and R = 0.287 kJ/(kg ·...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the working fluid. The evaporator pressure is 2 bar and the condenser pressure is 30 bar. The refrigerant leaves the compressor at 160oC. 1 ton of refrigeration = 3.517 kW Determine the cooling load, in kW. Plot all five points (1, 2s, 2a, 3, 4) on the P-h diagram. Determine the power consumed by the refrigeration system, in kW. Determine the COP of the system. Isentropic efficiency...
4. An Ideal diesel engine has a compression ratio of 20 and uses air as the...
4. An Ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95kPa and 20°C. If the maximum temperature in the cycle is not to exceed 2200K, determine a) the thermal efficiency and b) the mean effective pressure. Assume constant specific heats for air at room temperature. 5. An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio...
Fresh air at 3200 cfm, 41oC and 30% rh is mixed with recirculated air at 24oC...
Fresh air at 3200 cfm, 41oC and 30% rh is mixed with recirculated air at 24oC and 50% rh. The mixed air stream temperature is 32oC. The mixed air stream is then cooled, dehumidified and reheated to 16oC and 40% rh. The cooling is provided with a multi-stage vapor compression refrigeration system using R717 as the working fluid. The evaporator temperature is 12oC less than the air temperature leaving the cooling coil and the condenser temperature is 12oC higher than...
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...
An ideal Diesel cycle has a compression ratio of 19.9 and a cutoff ratio of 1.30. Determine the maximum temperature of...
An ideal Diesel cycle has a compression ratio of 19.9 and a cutoff ratio of 1.30. Determine the maximum temperature of the air and the rate of heat addition to this cycle when it produces 212 hp of power, and the state of the air at the beginning of the compression is 97 kPa and 17°C. Use constant specific heats at room temperature. K (Round to the nearest integer) max kW (Round to one decimal place) in
An ideal Diesel...
(6) Gas Refrigeration Air is the working fluid of a Brayton refrigeration cycle with a compressor pressure ratio of 3. At the beginning of the compression, the temperature Ti = 270 K and pressure P1 = 140 kPa. The turbine inlet temperature is T3 = 320 K. You may assume both heat exchangers operate without pressure losses. Draw a T-s diagram for this ideal cycle. If the volumetric flow rate at State 3 is 0.4 m3/s, what is the mass...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
Problem 7: (15 pts) An ideal air-standard Brayton cycle operates steadily with pressure limits of the cycle are 100 kPa and 800 kPa. The temperature at the exit of turbine is 500 K. During the heat rejection process, heat is released from the cycle at a rate of 320 kW and the mass flow rate is 2 kg/s. The air is treated as an ideal gas with constant specific heats, i.e. k = 1.4 and R = 0.287 kJ/(kg ·...
4. An Ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95kPa and 20°C. If the maximum temperature in the cycle is not to exceed 2200K, determine a) the thermal efficiency and b) the mean effective pressure. Assume constant specific heats for air at room temperature. 5. An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio...
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...
An ideal Diesel cycle has a compression ratio of 19.9 and a cutoff ratio of 1.30. Determine the maximum temperature of the air and the rate of heat addition to this cycle when it produces 212 hp of power, and the state of the air at the beginning of the compression is 97 kPa and 17°C. Use constant specific heats at room temperature. K (Round to the nearest integer) max kW (Round to one decimal place) in
An ideal Diesel...
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