22°C DB % 50RH QD=10kW QG=2.5kW D K A B
In a place where a summer air-conditioning plant will be installed, 40% of the air entering the air-conditioning plant is the fresh air, and 60% is the return (bypass) air. The sensible heat gain of the place is 10 kW. and the latent heat gain is 2.5 kW.
> Outdoor conditions: 32 °C DB, %50 RH.
> Indoor conditions: 20 °C DB. %50 RH.
> Take the relative humidity of the air passing through the cooling coil 90% at the coil outlet.
> The total air flow rate in the mixing chamber is 3000 m3/h
> Take the density of the air as 1.2 kg/m3
Based on the above.
a) Show the process on a psychrometric diagram.
b) Calculate the amount of fresh air.
c) What is the value of enthalpy of blowing air.
d) Calculate the ratio of by-pass air at cooling coil.
e) Calculate the flow rate of by-passed air.
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