Subject Refrigeration and Air Conditioning. Please answer in
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Subject Refrigeration and Air Conditioning. Please answer in
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QUESTION 15-COOLING TOWERS AND EVAPORATIVE CONDENSERS A...
Subject Refrigeration and Air Conditioning. Please answer in detail. QUESTION 4 - COOLING AND DEHUMIDIFYING COILS...
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 4 - COOLING AND DEHUMIDIFYING COILS An air conditioned space at 1700 metres altitude has a sensible heat gain of 26 kW and a latent heat gain of 6.5 kW. The space is maintained at 25°C dry bulb and 18°C wet bulb temperature:s The fresh air supply is to be 0.65 m3/s at 35°C dry bulb and 24°C wet bulb temperatures. The air leaving the coil has a relative humidity...
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s is cooled to 22°C in the cooling tower by air that enters the tower at 1 atm, 20°C, and 60% relative humidity and leaves saturated at 3...
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s
is cooled to 22°C in the cooling tower by air that enters the tower
at 1 atm, 20°C, and 60% relative humidity and leaves saturated at
30°C. The makeup water of 22°C is supplied to the outlet to make
the mass flow rate of the cool water the same as that at the inlet,
see Figure Q5.
Q.5Water entering a wet cooling tower at 35°C at...
The atmospheric air 32 °C dry bulb temperature and 70% relative humidity supplied to the cooling...
The atmospheric air 32 °C dry bulb temperature and 70% relative humidity supplied to the cooling coil at a rate of 45m3/min. The air cooling to the saturated state and leaving at a temperature of 16 °C. Determine: a- Specific humidity at each state. b- Wet bulb and dew point temperatures at the final state c- Final relative humidity. d- Mass of water condensed. e- Rate of heat removed from the air in kW. f- Show the process on Psychrometric...
need an answer for this question, please. thanks. An existing packed countercurrent water-cooling tower was designed...
need an answer for this question, please. thanks.
An existing packed countercurrent water-cooling tower was designed to cool water from 107.6 degree F to 82.4 degree F. The air enters at 82.4 degree F with a wet bulb temperature of 72.5 degree F. The water flow rate is 1900 lb_m water/h.ft^2 and the gas flowrate is 1450 lb_m dry air/h.ft^2. The tower operates at a pressure of 1 atm. Given the overall mass-transfer coefficient (K_ca) is 6.75 lb mol/h.ft^3. Determine...
Question 1 A forced draft countercurrent water cooling tower is to cool water from 43.3 to...
Question 1 A forced draft countercurrent water cooling tower is to cool water from 43.3 to 26.7 C. The air enters the bottom of the tower at 23.9 °C with a wet bulb temperature of 2 °C. The value of H for the flow condition is H 0.533 m the heat transfer resistance in the liquid phase h very high compared to mass transfer coefficient in the gas phase. Calculate the tower height needed if 1.5 times the minimum air...
Please show work 11-43·Atmospheric air with a dry bulb temperature of 30°C and a relative humidity...
Please show work
11-43·Atmospheric air with a dry bulb temperature of 30°C and a relative humidity f 40 percent enters the cooling section of an air-conditioning system at a rate of 10 kg/s and is cooled to 18°C. Determine the volumetric flow rate of the air leaving the cooling section, the heat-transfer rate required for this process, and the entropy change of the air per unit mass of dry air. If the velocity of the airstream is not to exceed...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure it? Is the wet-bulb temperature greater than dry-bulb temperature? Why? [10 p] 2. A cooling tower is to be designed to cool 8 kg/s of water from 37°C to 29 °C. Entering air is 25 °C and at 30 % relative humidity. Leaving air is 22 °C and at 90% relative humidity. a) Calculate the air flow rate, G. b) Determine the possible lowest...
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb...
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb temperature T., 30 'C and relative humidity фі80% and exits at a dry bulb temperature T2 179C and relative humidity ф2.50% as shown in the figure below. The condensate exits the system at 15 °C. The mass flow rate of the dry air is 2.5 kg/s. Assume the air is at atmospheric pressure P-101.3 kPa. Cooling coils T-17 C 0-50 % Pp:-6.282 kPa Ti-30...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes in moist air at 28°C, 1 atm and 70% relative humidity. The moist air first passes over a cooling coil in the dehumidifier unit and some water vapor is condensed. The rate of heat transfer between the moist air and the cooling coil is 38.69 kW. Both saturated moist air and condensate streams exit the dehumidifier unit at the same temperature. The moist air...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses R-134a as its refrigerant. Here we will analyze the system under the case of driving through a very hot environment of 40 °C. The interior of the car is kept at 20 °C. Refrigerant leaves the compressor at 1.6 MPa absolute and leaves the condenser as a saturated liquid. The evaporator operates at 400 kPa absolute and the refrigerant leaves as a saturated vapour....
Subject Refrigeration and Air Conditioning. Please answer in
detail.
QUESTION 4 - COOLING AND DEHUMIDIFYING COILS An air conditioned space at 1700 metres altitude has a sensible heat gain of 26 kW and a latent heat gain of 6.5 kW. The space is maintained at 25°C dry bulb and 18°C wet bulb temperature:s The fresh air supply is to be 0.65 m3/s at 35°C dry bulb and 24°C wet bulb temperatures. The air leaving the coil has a relative humidity...
Water entering a wet cooling tower at 35°C at a rate of 100 kg/s
is cooled to 22°C in the cooling tower by air that enters the tower
at 1 atm, 20°C, and 60% relative humidity and leaves saturated at
30°C. The makeup water of 22°C is supplied to the outlet to make
the mass flow rate of the cool water the same as that at the inlet,
see Figure Q5.
Q.5Water entering a wet cooling tower at 35°C at...
need an answer for this question, please. thanks.
An existing packed countercurrent water-cooling tower was designed to cool water from 107.6 degree F to 82.4 degree F. The air enters at 82.4 degree F with a wet bulb temperature of 72.5 degree F. The water flow rate is 1900 lb_m water/h.ft^2 and the gas flowrate is 1450 lb_m dry air/h.ft^2. The tower operates at a pressure of 1 atm. Given the overall mass-transfer coefficient (K_ca) is 6.75 lb mol/h.ft^3. Determine...
Question 1 A forced draft countercurrent water cooling tower is to cool water from 43.3 to 26.7 C. The air enters the bottom of the tower at 23.9 °C with a wet bulb temperature of 2 °C. The value of H for the flow condition is H 0.533 m the heat transfer resistance in the liquid phase h very high compared to mass transfer coefficient in the gas phase. Calculate the tower height needed if 1.5 times the minimum air...
Please show work
11-43·Atmospheric air with a dry bulb temperature of 30°C and a relative humidity f 40 percent enters the cooling section of an air-conditioning system at a rate of 10 kg/s and is cooled to 18°C. Determine the volumetric flow rate of the air leaving the cooling section, the heat-transfer rate required for this process, and the entropy change of the air per unit mass of dry air. If the velocity of the airstream is not to exceed...
H1- COOLING TOWER [10 p] 1. What is the wet bulb temperature? How can you measure it? Is the wet-bulb temperature greater than dry-bulb temperature? Why? [10 p] 2. A cooling tower is to be designed to cool 8 kg/s of water from 37°C to 29 °C. Entering air is 25 °C and at 30 % relative humidity. Leaving air is 22 °C and at 90% relative humidity. a) Calculate the air flow rate, G. b) Determine the possible lowest...
Name: QUESTION 1 [25 Points] Moist air enters an air conditioning system at a dry bulb temperature T., 30 'C and relative humidity фі80% and exits at a dry bulb temperature T2 179C and relative humidity ф2.50% as shown in the figure below. The condensate exits the system at 15 °C. The mass flow rate of the dry air is 2.5 kg/s. Assume the air is at atmospheric pressure P-101.3 kPa. Cooling coils T-17 C 0-50 % Pp:-6.282 kPa Ti-30...
QUESTION 1 [15 marks] Due: 5 August 2020 An air conditioner operating at steady state takes in moist air at 28°C, 1 atm and 70% relative humidity. The moist air first passes over a cooling coil in the dehumidifier unit and some water vapor is condensed. The rate of heat transfer between the moist air and the cooling coil is 38.69 kW. Both saturated moist air and condensate streams exit the dehumidifier unit at the same temperature. The moist air...
QUESTION 4 (15 marks) Below is a schematic of a car air conditioning system that uses R-134a as its refrigerant. Here we will analyze the system under the case of driving through a very hot environment of 40 °C. The interior of the car is kept at 20 °C. Refrigerant leaves the compressor at 1.6 MPa absolute and leaves the condenser as a saturated liquid. The evaporator operates at 400 kPa absolute and the refrigerant leaves as a saturated vapour....
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