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Psychrometric Chart
1- Dry Bulb Temperature
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2- Moisture Content (Specific Humidity) w
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3- Dew Point Temperature DPT or Tdp
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4- Wet Bulb Temperature WBT or Twb
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5- Relative Humidity R.H. ()
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6-Specific Volume (v)
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7-Specific enthalpy (h)
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Psychrometric Chart
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Psychrometric Processes
1- Sensible CoolingCooling Coil
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2- Sensible Heating Heating Coil
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Effect of Sensible Cooling/Heating on the Psychromtric Properties of Air
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Example Calculate the load on the heating coil used for heating 1.5 m3/s of moist air atDBT= 21 oC, WBT=15 oC by 20 oC. If the water is working fluid that enters thecoil at 85 oC, and leaves at 75 oC. Calculate the mass flow rate of the water.
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3- Evaporative Cooling
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Solution
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Example
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Example1m3/s of outdoor moist air at DBT= -1 oC, 100%; RH is mixed with 2 m3/s of recirculated air at DBT= 22 oC, 50% RH. Draw the process on the psychrometric chart and find the mixing point by calculations and then find the properties (RH,w,h,v) of the mixing point. Solution
