1,000 mol/hr of air at 70F (294.3 K) and 1 atm is cooled to 20F (266.5...
1,000 mol/hr of air at 70F (294.3 K) and 1 atm is cooled to 20F (266.5 K) by refrigeration. The surroundings are 70F and 1 atm. The thermodynamic efficiency of the process is 0.78. Determine the minimum power requirement of the process in W.
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1,000 mol/hr of air at 70F (294.3 K) and 1 atm is cooled to
20F (266.5...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
3. Consider a dual-loop cycle utilizing air as the working fluid is shown schematically in the fi...
3. Consider a dual-loop cycle utilizing air as the working fluid is shown schematically in the figure below. Air enters the compressor at 1 bar and 4°C and is compressed to 3 bar. Part of the air exiting the compressor enters the refrigeration cycle and remaining enters the power cycle. The air supplied to the refrigeration cycle from the compressor is cooled to the 55°C at constant pressure in a heat exchanger and then expands in a turbine to 1...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 895 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected. a)Determine the mass flow rate of the dry air in lb(dry air)/min....
8.314J. 1 atm- 1.01325X10% Pa; 1 m2-101:760 torr-1 atm; R-0.0821 1. atm. K' mol K.1 mol Note that the different parts of question 1 are independent. Answering a part of a question wrong or sk...
8.314J. 1 atm- 1.01325X10% Pa; 1 m2-101:760 torr-1 atm; R-0.0821 1. atm. K' mol K.1 mol Note that the different parts of question 1 are independent. Answering a part of a question wrong or skipping it altogether should not affect your ability to answer other parts correctly. iven the relationship dG-V dP-S dT which indicates that G-(P, T). Also knowing that G is a state functions (meaning the reciprocity rule applies on it), derive the relation: os OP av Using...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 1765 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected. A. Determine the mass flow rate of the dry air in lbm(dry...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 1765 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected. A. Determine the mass flow rate of the dry air in Ibm(dry...
A stoichiometric mixture of methane air, initially at 298 K and 1 atm pressure, combust to...
A stoichiometric mixture of methane air, initially at 298 K and 1 atm pressure, combust to form products in a large room. It is wise to read Example 5.2 before doing the next set of problems. $15. The thermal diffusivity, a, is a thermodynamic property because it is a function of other thermodynamic properties. Determine a for air at 1300 K. Note that the temperatures in Appendix B are in K. Example 5.2 Estimate the laminar flame speed of a...
Problem 7 O/5 points (0%) Humid air at 1 atm, 42 °C dry bulb and 55 % relative humidity is cooled...
Problem 7 O/5 points (0%) Humid air at 1 atm, 42 °C dry bulb and 55 % relative humidity is cooled at constant pressure to a temperature 9 °C below its dew-point temperature. Sketch the psychrometric diagram for the process and determine the heat transfer from the air o kJ/kg dry air Cooling coils T2 φ2 T1 ф! 101.3 kPa i H-4」+'Condensate Condensate removal Now Problem (resets attempts) Resets Remaining: 10 Attempts Remaining: 10 Submit
Problem 7 O/5 points (0%)...
1. Similar to Problem 8-70 Air enters a compressor at ambient conditions of 15 psia and...
1. Similar to Problem 8-70 Air enters a compressor at ambient conditions of 15 psia and 50°F with a low velocity and exits at 150 psia, 620°F, and 350 ft/s. The compressor is cooled by the ambient air at 50°F at a rate of 1500 Btu/min. The power input to the compressor is 1000 hp. Determine (a) the mass flow rate of air and (b) the portion of the power input that is used just to overcome the irreversibilities. WRITE...
Problem 1 (20 marks): A 1-m x 1-m surface at 100 °C is to be cooled...
Problem 1 (20 marks): A 1-m x 1-m surface at 100 °C is to be cooled by attaching to it 5-cm long, 0.25- cm-thick square aluminum fins (k = 237 W/m- K), with an edge-to-edge distance between the fins of 0.25 cm. The temperature of the fin tip is the same as surrounding medium at 30°C, und the heat transfer coefficient on the surfaces is 35 W/m2 K. Determine: temperature at distance of 2 cm away from the base the...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
3. Consider a dual-loop cycle utilizing air as the working fluid is shown schematically in the figure below. Air enters the compressor at 1 bar and 4°C and is compressed to 3 bar. Part of the air exiting the compressor enters the refrigeration cycle and remaining enters the power cycle. The air supplied to the refrigeration cycle from the compressor is cooled to the 55°C at constant pressure in a heat exchanger and then expands in a turbine to 1...
8.314J. 1 atm- 1.01325X10% Pa; 1 m2-101:760 torr-1 atm; R-0.0821 1. atm. K' mol K.1 mol Note that the different parts of question 1 are independent. Answering a part of a question wrong or skipping it altogether should not affect your ability to answer other parts correctly. iven the relationship dG-V dP-S dT which indicates that G-(P, T). Also knowing that G is a state functions (meaning the reciprocity rule applies on it), derive the relation: os OP av Using...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 1765 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected. A. Determine the mass flow rate of the dry air in lbm(dry...
Air at 95°F, 1 atm, and 10% relative humidity enters an evaporative cooler operating at steady state. The volumetric flow rate of the incoming air is 1765 ft3/min. Liquid water at 68°F enters the cooler and fully evaporates. Moist air exits the cooler at 70°F, 1 atm. There is no significant heat transfer between the device and its surroundings and kinetic and potential energy effects can be neglected. A. Determine the mass flow rate of the dry air in Ibm(dry...
A stoichiometric mixture of methane air, initially at 298 K and 1 atm pressure, combust to form products in a large room. It is wise to read Example 5.2 before doing the next set of problems. $15. The thermal diffusivity, a, is a thermodynamic property because it is a function of other thermodynamic properties. Determine a for air at 1300 K. Note that the temperatures in Appendix B are in K. Example 5.2 Estimate the laminar flame speed of a...
Problem 7 O/5 points (0%) Humid air at 1 atm, 42 °C dry bulb and 55 % relative humidity is cooled at constant pressure to a temperature 9 °C below its dew-point temperature. Sketch the psychrometric diagram for the process and determine the heat transfer from the air o kJ/kg dry air Cooling coils T2 φ2 T1 ф! 101.3 kPa i H-4」+'Condensate Condensate removal Now Problem (resets attempts) Resets Remaining: 10 Attempts Remaining: 10 Submit
Problem 7 O/5 points (0%)...
Problem 1 (20 marks): A 1-m x 1-m surface at 100 °C is to be cooled by attaching to it 5-cm long, 0.25- cm-thick square aluminum fins (k = 237 W/m- K), with an edge-to-edge distance between the fins of 0.25 cm. The temperature of the fin tip is the same as surrounding medium at 30°C, und the heat transfer coefficient on the surfaces is 35 W/m2 K. Determine: temperature at distance of 2 cm away from the base the...
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