A moist air sample has dry bulb temperature of 30ºC and specific humidity of 11.5g water vapour per kg dry air. Assume molecular weight of air as 28.93. If the saturation vapour pressure of water at 30ºC is 4.24 kPa and the total pressure is 90kPa, then the relative humidity (in %) of air sample is
38.5
With molecular-mass ratio ε=18/28.93, pv=ωp/(ε+ω)=0.0115(90)/(18/28.93+0.0115)≈1.633 kPa. Relative humidity is pv/4.24≈38.5%.
Important Questions from Properties of Moist Air (Psychrometric Properties)
Spray humidifying is the process of adding moisture to the air by passing it through
A. Chiller
B. Air conditioning plant
C. WashersDew point temperature is the temperature at which condensation begins when the air is cooled at constant
Which of the following increases during sensible heating of moist air
1. Relative Humidity
2. Humidity Ratio
3. Wet bulb temperature
4. Specific volume
Select the correct answer from codes given below:
Relative humidity is the ratio of:
In a saturated air-water vapour mixture, the
