KTB Nr. 2006-35-kj-en Collector test according to EN 12975-1,2:2006
KTB Nr. 2006-35-kj-en Collector test according to EN 12975-1,2:2006
KTB Nr. 2006-35-kj-en Collector test according to EN 12975-1,2:2006
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19 Stagnation temperature<br />
The stagnation temperature was measured outdoors. The measured data<br />
are shown in the table below. To determine the stagnation temperature,<br />
these data were extrapolated <strong>to</strong> an irradiance of 1000 W/m 2 and an<br />
ambi<strong>en</strong>t temperatur of 30 ◦ C. The calculation is as follows:<br />
t s = t as + G s<br />
G m<br />
∗ (t sm − t am ) (4)<br />
t s : Stagnation temperature<br />
t as : 30 ◦ C<br />
G s : 1000 W/m 2<br />
G m : Solar irradiance on collec<strong>to</strong>r plane<br />
t sm : Absorber temperature<br />
t am : Surrounding air temperature<br />
Measurem<strong>en</strong>t Irradiance Surrounding air Absorber<br />
temperature temperature<br />
[W/m 2 ] [ ◦ C] [ ◦ C]<br />
1 959 27.3 232.0<br />
2 933 27.3 239.8<br />
3 965 28.3 216.4<br />
4 959 28.6 214.1<br />
5 1033 20.1 227.8<br />
6 1052 20.3 223.7<br />
The resulting stagnation temperature is:<br />
234.0 ◦ C<br />
<strong>KTB</strong> <strong>Nr</strong>. <strong>2006</strong>-<strong>35</strong>-k-j-<strong>en</strong> : <strong>Collec<strong>to</strong>r</strong> <strong>test</strong> <strong>according</strong> <strong>to</strong> <strong>EN</strong> <strong>12975</strong>-1,2:<strong>2006</strong><br />
IMMERGAS S.p.A. , Series Collet<strong>to</strong>re Solare Piano CP4M and Collet<strong>to</strong>re Solare Piano CP2M<br />
04.07.2007, Fraunhofer-ISE, Heid<strong>en</strong>hofstraße 2, D-79110 Freiburg<br />
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