Question

In an air conditioning unit,air at 30c dbt and 70% relative humidity is cooled to 21 c dbt.Calculate the amount of heat removal rate

Answer 1

steam tables (table 1.4), we find that the saturation pressure of vapour corresponding todry bulb temperature of 22ºC is

 p

s

=0.026448 barWe know that relative humidity (

φ 

),026448.03.0

vsv

 p p p

==

 

∴

 

 p

v

=0.3×0.02642=0.007934 bar

 2.Humidity ratio

 We know that humidity ratio,007934.001384.1007934.0622.0622.0

−×=−×=

vbv

 p p pW 

 = 0.0049 kg / kg of dry air

 3.Vapour density

 We know that vapour density,

( ) ( )( )

2227328710007934.001384.1