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u ut slatept I. 5. A dehumidifier is used to extract excess moisture from the air...
3. Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C...
3. Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C is first heated in a heater to a dry bulb temperature of 90C. Then it is passed through a bed of apricot slices to dry them. The air exiting from the top of the apricot bed is at a dry bulb temperature of 60C. It is then passed through a dehumidifier to reduce its relative humidity to 10%. Clearly show the various paths of...
2) Very humid air enters a dehumidifier at 500 ft^3/min. The air is at a dry-bulb...
2) Very humid air enters a dehumidifier at 500 ft^3/min. The air is at a dry-bulb temperature of 85 degrees F and a relative humidity of 90%. The specific humidity of the mixture must be brought to 30 grains of water per pound mass of air. Assume atmospheric mixture pressure. A) How low must the dry-bulb temperature go to achieve this? B) What is the rate at which energy must be removed to accomplish the reduction in specific humidity, in...
2- Air at 39.5 °C and humidity ratio of 9 (grams /kg dry air) is humidified...
2- Air at 39.5 °C and humidity ratio of 9 (grams /kg dry air) is humidified adiabatically to 70% relative humidity (sea-level pressure). Liquid water is supplied at 70 °C for humidification (hf = 293 kJ/kg, hg = 2626.1 kJ/kg) Determine: a) The initial wet bulb temperature b) The initial relative humidity c) The initial density d) The final wet bulb temperature e) The final density f) The final dry bulb temperature
An air conditioner operating at steady state takes in moist air at 30 °C, 1 bar and a wet bulb temperature of 25
An air conditioner operating at steady state takes in moist air at 30 °C, 1 bar and a wet bulb temperature of 25 °C. The moist air is cooled in the dehumidifier unit and some of the water is removed. There is 10 tons of cooling in the dehumidifier (also called the evaporator of an air conditioner). The condensate and the saturated air stream discharging the section is at 10 °C The moist air is then heated in the heater...
A dehumidifier receives a flow of 025 kgs dry air at 28°C, 80% relative humidity, as...
A dehumidifier receives a flow of 025 kgs dry air at 28°C, 80% relative humidity, as shown in the figure. It is cooled down to 20°C as it flows over the evaporator and then is heated up again as it flows over the condenser. The standard refrigeration cycle uses R-22 with an evaporator temperature of5°C and a condensation pressure of 1600 kPa. Determine: (a) the amount of liquid water removed, (10 points) (b) the heat transfer in the cooling process,...
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...
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...
150 ft3/min of air at 80F dry-bulb temperature and 70% relative humidity enters an air conditioning...
150 ft3/min of air at 80F dry-bulb temperature and 70% relative humidity enters an air conditioning unit and leaves it as saturated air at 50F. Part of the moisture in the air that condensate is collected and removed at 55F. Draw the cycle on the attached chart and a)Determine the rates of heat removal from the air. b)Determine the rate of moisture removal from the air
56. Fresh air is introduced into a room at such a rate that the air in...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
The weather report indicates that the temperature outside is 15°C with a relative humidity of 75%....
The weather report indicates that the temperature outside is 15°C with a relative humidity of 75%. Using this information, provide the following: a) Wet bulb temperature b) Dew point temperature c) Moisture content of the outside air d) Specific volume of the outside air e) Enthalpy of the outside air f) How much moisture would you need to add to the air in order to saturate it? (Give this answer in kg moisture/kg dry air). g) The air temperature in...
A dehumidifier receives a flow of 025 kgs dry air at 28°C, 80% relative humidity, as shown in the figure. It is cooled down to 20°C as it flows over the evaporator and then is heated up again as it flows over the condenser. The standard refrigeration cycle uses R-22 with an evaporator temperature of5°C and a condensation pressure of 1600 kPa. Determine: (a) the amount of liquid water removed, (10 points) (b) the heat transfer in the cooling process,...
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...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
The weather report indicates that the temperature outside is 15°C with a relative humidity of 75%. Using this information, provide the following: a) Wet bulb temperature b) Dew point temperature c) Moisture content of the outside air d) Specific volume of the outside air e) Enthalpy of the outside air f) How much moisture would you need to add to the air in order to saturate it? (Give this answer in kg moisture/kg dry air). g) The air temperature in...
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