Homework Answers
Given dry bulb temperature=10 degree Celsius
Air flow rate=1000m^3/hr
Gas constant R= 287 J/kgK
Total pressure Pt= 1.0132 bar
Pv= 0.01212 bar ( from steam tables, at 10 degree Celsius
Therefore, mass flow rate /sec= (Pt-Pv)x (V)/RT
=
(1.0132-0.01212)*(100000)*(1000)/(287)(273+10)(60*60)
=0.342kg/s
ma=0.342kg/s
Therefore,
heating coil capacity = ma x Cp (21-10)
= 0.342 x 1.005 x11
= 3.8 KW
Hence, option (a) is correct.
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