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fundamentals of engineering supplied-reference handbook - Ventech!

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Cooling and Dehumidification<br />

ω<br />

Q�<br />

m�<br />

ω<br />

out<br />

w<br />

= m�<br />

= m�<br />

a<br />

2<br />

4<br />

1 2<br />

1<br />

4'<br />

T<br />

a [ ( h1<br />

− h2<br />

) − h f 3(<br />

ω1<br />

− ω2<br />

) ]<br />

( ω − ω )<br />

1<br />

Heating and Humidification<br />

Q�= m�h −h<br />

2<br />

( )<br />

( ) or ( )<br />

in a 2 1<br />

m� = m� ω −ω m�<br />

= ω −ω<br />

w a 4′ 2 w 4 2<br />

T<br />

WATER OR STEAM<br />

4, 4<br />

210<br />

ω<br />

ω<br />

2<br />

1<br />

MECHANICAL ENGINEERING (continued)<br />

Adiabatic Humidification (evaporative cooling)<br />

h2<br />

= h1<br />

+<br />

m�<br />

w = m�<br />

a 2<br />

h = h at<br />

3<br />

f<br />

h3(<br />

ω2<br />

− ω1<br />

)<br />

( ω − ω )<br />

T<br />

1<br />

wb<br />

Adiabatic Mixing<br />

distance<br />

a3<br />

3<br />

1<br />

m�<br />

a3<br />

= m�<br />

a1<br />

+ m�<br />

a2<br />

m�<br />

a1h1<br />

+ m�<br />

a2h2<br />

h3<br />

=<br />

m�<br />

a3<br />

m�<br />

a1ω1<br />

+ m�<br />

a2ω<br />

ω3<br />

=<br />

m�<br />

2<br />

T<br />

__<br />

a2<br />

= × distance<br />

m�<br />

a3<br />

__<br />

13<br />

m�<br />

psychrometric chart<br />

2<br />

T<br />

12 measured on<br />

3

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