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Given that
we have to determine the energy cost for 4000 hours of operation. electricity cost is $ .15/kWh and the air conditioner COP is 3.
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× Question "6.10: A dual path or DOAS system is proposed for teh supermarket application. Determi...
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...
Moist air enters a cooling coil at 27°C DBT and 60 percent relative humidity at a...
Moist air enters a cooling coil at 27°C DBT and 60 percent relative humidity at a flow rate of 1.15 kg/s and leaves at 16°C DBT and 90 percent relative humidity. Calculate the latente load on the coil, the sensible heat ratio and the bypass factor.
A building is designed for the following cooling loads. Room specific heat gain and latent heat g...
A building is designed for the following cooling loads. Room specific heat gain and latent heat gains are 310 kW and 100 kW respectively. The room is maintained at a dry bulb temperature of 25°C and relative humidity of 50%. The outdoor air is at 28°C with 50% relative humidity, 10% by mass of outdoor air is supplied to the building. If the air supplied to the room should be at a temperature lower than 18°C, detemine the following. (a)...
CHAPTER 2. SELECTED TOPICS IN THERMODYNAMICS Laboratory Quiz 4 - Psychrometry A new HVAC system is...
CHAPTER 2. SELECTED TOPICS IN THERMODYNAMICS Laboratory Quiz 4 - Psychrometry A new HVAC system is been tested at the laboratory. The experimental data for the humid air at Inlet conditions that include Dry bulb temperature of 33.4°C and Relative humidity of 40% and at Outlet conditions that include Dry bulb temperature of 22.0°C and Dew point temperature of 18.0°C. The mass flow rate of dry air is 100 kg/s. Assume that the temperature of the condensate water is equal...
Question NO. 3 (25 points) A space to be maintained at 27°C dry-bulb temperature has a rate of sensible-heat gain of 13 kW and a rate of latent heat gain of 8.5 kW. The system used to condition t...
Question NO. 3 (25 points) A space to be maintained at 27°C dry-bulb temperature has a rate of sensible-heat gain of 13 kW and a rate of latent heat gain of 8.5 kW. The system used to condition the space to the required conditions. The mass flow rate of air supplied to the space is 1.1 kg/s. Outdoor air at 38 °C dry-bulb temperature and 17 ℃ dew-point temperature is introduced into the system at a rate of 0.28 kg/s....
A summer air conditioning system with recirculating air stream and BPF = 0 has a room sensible heat load of 20 kW and a room latent heat load of 2.22 kW. The required inside conditions are 22\degc and 50% RH, and the outdoor design conditions are 36\degc
A summer air conditioning system with recirculating air stream and BPF = 0 has a room sensible heat load of 20 kW and a room latent heat load of 2.22 kW. The required inside conditions are 22°C and 50% RH, and the outdoor design conditions are 36°C and 60% RH. The mass flow rate of the outside air is 15% of the mass flow rate of the supply air. Find a) RSHF b) the point s on the chart, mass...
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...
20. ice cream contains 4% protein, 13% lipids and 21% carbohydrates. Please recall: carbohydrates- 4 kCal/g,...
20. ice cream contains 4% protein, 13% lipids and 21% carbohydrates. Please recall: carbohydrates- 4 kCal/g, lipids - 9 kCal/g and proteins - 4 kCal/g. Ice cream has a density of 0.574 kg/L. What temperature change would you expect to see in the water portion (2,500 g) of a bomb calorimeter when evaluation the energy content of a 20 g sample of ice cream? 21. Extra Credit (10 pts.): Two thousand (2,000) pigs at the growing-finishing stage (40 kg) are...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
A two-pipe direct return chilled water system with an expansion tank is used to circulate water...
A two-pipe direct return chilled water system with an expansion tank is used to circulate water for cooling three identical loads in a commercial building. Each load is connected with a balancing valve, zone valve and thermostat. Given that the cooling capacity of each load is 50 kW, density of water 1000kg/m3, a specific heat of water Cpw 4.185 kJ/kg K and gravitational constant 10 m/s2. (a) Sketch a schematic of the system illustrating all the components. (6%) Legend Expansion...
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...
A building is designed for the following cooling loads. Room specific heat gain and latent heat gains are 310 kW and 100 kW respectively. The room is maintained at a dry bulb temperature of 25°C and relative humidity of 50%. The outdoor air is at 28°C with 50% relative humidity, 10% by mass of outdoor air is supplied to the building. If the air supplied to the room should be at a temperature lower than 18°C, detemine the following. (a)...
CHAPTER 2. SELECTED TOPICS IN THERMODYNAMICS Laboratory Quiz 4 - Psychrometry A new HVAC system is been tested at the laboratory. The experimental data for the humid air at Inlet conditions that include Dry bulb temperature of 33.4°C and Relative humidity of 40% and at Outlet conditions that include Dry bulb temperature of 22.0°C and Dew point temperature of 18.0°C. The mass flow rate of dry air is 100 kg/s. Assume that the temperature of the condensate water is equal...
Question NO. 3 (25 points) A space to be maintained at 27°C dry-bulb temperature has a rate of sensible-heat gain of 13 kW and a rate of latent heat gain of 8.5 kW. The system used to condition the space to the required conditions. The mass flow rate of air supplied to the space is 1.1 kg/s. Outdoor air at 38 °C dry-bulb temperature and 17 ℃ dew-point temperature is introduced into the system at a rate of 0.28 kg/s....
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...
20. ice cream contains 4% protein, 13% lipids and 21% carbohydrates. Please recall: carbohydrates- 4 kCal/g, lipids - 9 kCal/g and proteins - 4 kCal/g. Ice cream has a density of 0.574 kg/L. What temperature change would you expect to see in the water portion (2,500 g) of a bomb calorimeter when evaluation the energy content of a 20 g sample of ice cream? 21. Extra Credit (10 pts.): Two thousand (2,000) pigs at the growing-finishing stage (40 kg) are...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...
A two-pipe direct return chilled water system with an expansion tank is used to circulate water for cooling three identical loads in a commercial building. Each load is connected with a balancing valve, zone valve and thermostat. Given that the cooling capacity of each load is 50 kW, density of water 1000kg/m3, a specific heat of water Cpw 4.185 kJ/kg K and gravitational constant 10 m/s2. (a) Sketch a schematic of the system illustrating all the components. (6%) Legend Expansion...
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