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system system 6. Redraw the system in problem 5 for the case of a DX cooling...
Wac (elec) The diagram depicts a portion of a DX air-conditioning system that provides cooling to...
Wac (elec) The diagram depicts a portion of a DX air-conditioning system that provides cooling to one zone in a building. The outdoor unit provides heat-rejection and includes the compressor and the condenser fan. The indoor-fan moves air from the conditioned zone, across the cooling coil, and then back to the conditioned zone. The indoor-fan (with directly coupled motor) is located within the air-stream. Electric power consumption of the indoor fan motor is denoted Wm. The electrical power supply for...
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...
Problem: Feasibility Study of Recovering Waste Heat from Primary Process Cooling Water to Provide Heat for...
Problem: Feasibility Study of Recovering Waste Heat from Primary Process Cooling Water to Provide Heat for a Secondary Process Primary Process Cooling Water 100 F Secondary Process Requirements: Heat Supply Rate of 330,000 BTU/hr at 150 F Recovery System Heat Pump R134a Compressor Isentropic Efficiency: 76% Design Values Evaporator Coil Design Pressure: 160 psi Condenser Coil Design Pressure: 300 psi Deliverables Design Coil Temperatures (Evaporator and Condenser) - Confirm that these will be consistent with temperatures at the heat source...
Problem 2: A residential air-conditioner with an actual cooling capacity of 14.06 kJ/s (4 tons), cools and dehumidifies a steady stream of air flowing over the cooling coil. Actual states for the Ref...
Problem 2: A residential air-conditioner with an actual cooling capacity of 14.06 kJ/s (4 tons), cools and dehumidifies a steady stream of air flowing over the cooling coil. Actual states for the Refrigerant 134a are given Notice that the compressor efficiency is less than 100% and there are small pressure drops given for the heat exchangers. The coefficient of performance is 3.51 for the actual cycle. Changes in kinetic and potential energy are negligible. The warm indoor air temperature entering...
please write neat and include your approach to the problem along with any assumptions youre operating...
please write neat and include your approach to the problem along
with any assumptions youre operating under
14-88 Atmospheric air at 1 atm, 32°C, and 95 percent rela- tive humidity is cooled to 24°C and 60 percent relative humid- ity. A simple ideal vapor-compression refrigeration system using refrigerant-134a as the working fluid is used to provide the cooling required. It operates its evaporator at 4°C and its condenser at a saturation temperature of 39.4°C. The con- denser rejects its heat...
Pressure limits in a two-stage cooling system are 0.9 MPa and 250kPa. Refrigerant condenser comes out...
Pressure limits in a two-stage cooling system are 0.9 MPa and
250kPa. Refrigerant condenser
comes out as saturated liquid and works at 700kPa pressure
reduced to the pressure of the evaporation chamber. Meanwhile, some
of the refrigerant evaporates and is mixed with the fluid from the
low pressure compressor. The mixture is then
It is compressed to condenser pressure with high pressure
compressor. The liquid in the evaporation chamber is reduced to
evaporator pressure and draws heat from the cooled...
Which of the following statements are TRUE? ( the answer in half hour please ) 1)...
Which of the following statements are TRUE? ( the answer in half hour please ) 1) otary compressors are positive displacement; refrigerant is compressed due to movement of blades * 2)In all-air HVAC systems, the thermal energy transfer medium is water * 3)The evaporator is device used in the high pressure side of a refrigeration system * 4)The fan-coil unit can be placed in the room or exposed to occupants. It is used for heating and cooling * 5)Evaporative condenser...
Problem -4 (200) In the condenser of a power plant, energy is discharged by heat transfer...
Problem -4 (200) In the condenser of a power plant, energy is discharged by heat transfer at a rate of 853035 Btu/s to cooling water that exits the condenser at 110°F into a cooling tower. Cooled water at 64°F is returned to the condenser. Atmospheric air enters the tower at 80°F, 1 atm, 30% relative humidity. Moist air exits at 98°F, 1 atm, 95% relative humidity. Makeup water is supplied at 64°F. For operation at steady state, determine (a) Draw...
fluid 12 6 Problem 5.12 An evaporative cooling tower (see the figure below) is used to...
fluid
12 6 Problem 5.12 An evaporative cooling tower (see the figure below) is used to cool water from 110 to 80 °F . Water enters the tower at a rate of 250,000 lbm/hr. Dry air (no water vapor) flows into the tower at a rate of 151,000 lbm/hr. If the rate of wet airflow out of the tower is 156,900 Ibm/hr. determine the rate of water evaporation in lbm/hr and the rate of cooled water flow in lbm/hr. Wet...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
Wac (elec) The diagram depicts a portion of a DX air-conditioning system that provides cooling to one zone in a building. The outdoor unit provides heat-rejection and includes the compressor and the condenser fan. The indoor-fan moves air from the conditioned zone, across the cooling coil, and then back to the conditioned zone. The indoor-fan (with directly coupled motor) is located within the air-stream. Electric power consumption of the indoor fan motor is denoted Wm. The electrical power supply for...
Problem: Feasibility Study of Recovering Waste Heat from Primary Process Cooling Water to Provide Heat for a Secondary Process Primary Process Cooling Water 100 F Secondary Process Requirements: Heat Supply Rate of 330,000 BTU/hr at 150 F Recovery System Heat Pump R134a Compressor Isentropic Efficiency: 76% Design Values Evaporator Coil Design Pressure: 160 psi Condenser Coil Design Pressure: 300 psi Deliverables Design Coil Temperatures (Evaporator and Condenser) - Confirm that these will be consistent with temperatures at the heat source...
Problem 2: A residential air-conditioner with an actual cooling capacity of 14.06 kJ/s (4 tons), cools and dehumidifies a steady stream of air flowing over the cooling coil. Actual states for the Refrigerant 134a are given Notice that the compressor efficiency is less than 100% and there are small pressure drops given for the heat exchangers. The coefficient of performance is 3.51 for the actual cycle. Changes in kinetic and potential energy are negligible. The warm indoor air temperature entering...
please write neat and include your approach to the problem along
with any assumptions youre operating under
14-88 Atmospheric air at 1 atm, 32°C, and 95 percent rela- tive humidity is cooled to 24°C and 60 percent relative humid- ity. A simple ideal vapor-compression refrigeration system using refrigerant-134a as the working fluid is used to provide the cooling required. It operates its evaporator at 4°C and its condenser at a saturation temperature of 39.4°C. The con- denser rejects its heat...
Pressure limits in a two-stage cooling system are 0.9 MPa and
250kPa. Refrigerant condenser
comes out as saturated liquid and works at 700kPa pressure
reduced to the pressure of the evaporation chamber. Meanwhile, some
of the refrigerant evaporates and is mixed with the fluid from the
low pressure compressor. The mixture is then
It is compressed to condenser pressure with high pressure
compressor. The liquid in the evaporation chamber is reduced to
evaporator pressure and draws heat from the cooled...
Problem -4 (200) In the condenser of a power plant, energy is discharged by heat transfer at a rate of 853035 Btu/s to cooling water that exits the condenser at 110°F into a cooling tower. Cooled water at 64°F is returned to the condenser. Atmospheric air enters the tower at 80°F, 1 atm, 30% relative humidity. Moist air exits at 98°F, 1 atm, 95% relative humidity. Makeup water is supplied at 64°F. For operation at steady state, determine (a) Draw...
fluid
12 6 Problem 5.12 An evaporative cooling tower (see the figure below) is used to cool water from 110 to 80 °F . Water enters the tower at a rate of 250,000 lbm/hr. Dry air (no water vapor) flows into the tower at a rate of 151,000 lbm/hr. If the rate of wet airflow out of the tower is 156,900 Ibm/hr. determine the rate of water evaporation in lbm/hr and the rate of cooled water flow in lbm/hr. Wet...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
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