At 1 atm, 27°C, and 50% relative humidity, atmospheric air from the inside of a car enters the evaporator part of the air conditioner. The air returns to the car at a temperature of 10°C and a relative humidity of 90% (Figure Q1). The passenger compartment has a volume of 2 m3 and requires 5 air changes per minute to keep the interior of the automobile at the necessary degree of comfort. (a) State the assumptions and determine the dew point and wet bulb temperature, enthalpy, specific humidity and specific volume at the inlet to the evaporator section, and enthalpy and specific humidity at the exit of evaporative section using psychrometric chart. (b) Determine the rate of condensation of water vapor in the evaporator section, in kg/min. (c) In kW, determine the required heat transfer rate from the ambient air to the evaporator fluid. (d) Sketch the psychrometric diagram for the atmospheric air flowing through the air conditioning process and discuss the process path.
At 1 atm, 27°C, and 50% relative humidity, atmospheric air from the inside of a car enters the evaporator part of the air conditioner. The air returns to the car at a temperature of 10°C and a relative humidity of 90% (Figure Q1). The passenger compartment has a volume of 2 m3 and requires 5 air changes per minute to keep the interior of the automobile at the necessary degree of comfort.
(a) State the assumptions and determine the dew point and wet bulb temperature, enthalpy, specific humidity and specific volume at the inlet to the evaporator section, and enthalpy and specific humidity at the exit of evaporative section using psychrometric chart.
(b) Determine the rate of condensation of water vapor in the evaporator section, in kg/min.
(c) In kW, determine the required heat transfer rate from the ambient air to the evaporator fluid.
(d) Sketch the psychrometric diagram for the atmospheric air flowing through the air conditioning process and discuss the process path.
(Use psychrometric chart as required)
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