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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask C Report, D<strong>at</strong>e: 13.01.2009<br />

3.3 Example<br />

<strong>Cooling</strong> w<strong>at</strong>er: ϑ<br />

w1<br />

= 33 °C<br />

<strong>Cooling</strong> w<strong>at</strong>er mass flow<br />

Air flow r<strong>at</strong>e<br />

Wet bulb temper<strong>at</strong>ure<br />

Ideal minimum air r<strong>at</strong>io<br />

m = 1,11 kg/s = 4.000 kg/h<br />

M = 1,38 kg/s (inform<strong>at</strong>ion of the producer)<br />

ϑ<br />

wb<br />

= 16,5 °C<br />

l<br />

min<br />

= 1,0<br />

Real air r<strong>at</strong>io l<br />

0<br />

= 1,243<br />

l0<br />

Air r<strong>at</strong>io of a wet cooling tower λ = = 1, 24 l<br />

<strong>Cooling</strong> grad<strong>at</strong>ion η = 0,67 (out of figure 3.5)<br />

Result: <strong>Cooling</strong> w<strong>at</strong>er ϑ<br />

w2<br />

ϑ w2<br />

=<br />

min<br />

ϑw<br />

1<br />

−ϑw2<br />

= 0,64 → ϑ<br />

w 2<br />

= 22, 09°<br />

C<br />

ϑ −ϑwb<br />

w1<br />

page 24

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