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As relative humidity decreases, the dew point will be

This question was previously asked in
UKPSC JE Mechanical 2013 Official Paper II
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  1. lower than wet bulb temperature
  2. higher than wet bulb temperature
  3. equal to wet bulb temperature
  4. None of these

Answer (Detailed Solution Below)

Option 1 : lower than wet bulb temperature
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Detailed Solution

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Explanation:

For sensible heating process

  1. Dry Bulb Temperature increases
  2. Wet Bulb Temperature increases
  3. Dew Point Temperature, Specific humidity and vapour pressure remains constant
  4. Enthalpy increases
  5. Relative humidity decreases

As relative humidity decreases, the dew point will be lower than wet bulb temperature.

Psychrometric chart for sensible Heating

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Q1.For a winter air-conditioning system, relative humidity should NOT be more than:
Q2.In the winter air-conditioning, for comfort, moisture is added without changing its dry bulb temperature and the air is made to warm up. Identify the type of process.
Q3.The ratio of the sensible heat transfer to the total heat transfer in air - conditioning systems is known as ______.
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