IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Monitoring Procedure Usually the heat acquired by the solar collectors is stored in buffer tanks before being used. In some cases the hot buffer is shared with the heat backup system and it represents the only connection point between the heat sources and the load (Figure 3-1). Q_sol E1 Collector field E2 Q1 Hot storage Q1S Q2S E3 Back up heat source (conventionally powered or RES or waste heat…) Figure 3-1 Connection between the heat back-up system and the solar collectors: shared hot storage This means that: Q 2D _ fossil = 0 [ ] kWh th Eq. 23 [ ] Q 2D _ RES = 0 kWh th Eq. 24 Q2 _ total sum = Q2S_ fossil + Q2D _ fossil + Q2S _ RES + Q2D _ RES = Q2S_ fossil + Q2S _ RES = Q2S Eq. 25 In these cases, as the output of the storage includes both the input from solar and back-up system, the storage solar fraction, defined as the ratio between the heat collected by the solar collectors and the heat produced by the backup system, is calculated according to: 17 99% draft Version
IEA SHC Task 38 Monitoring Procedure SF Q1 = hotstorage Q1 + Eq. 26 Q2S Q_sol E1 Collector field E2 Q1 Hot storage Q1S Q2S Q2D E3 Back up heat source (conventionally powered or RES or waste heat…) Figure 3-2 Connection between the heat back-up system and the solar collectors: direct use of the heat supplied by the back-up system If the heat delivered by the back-up system is also directly used (Figure 3-2), the output from the storage due to the solar collectors is given by: ⎛ Q1 ⎞ Q1s * ⎜ ⎟ ⎝ Q1 + Q2S ⎠ [ ] kWh th Eq. 27 Hence the storage solar fraction amounts to: Fehler! Es ist nicht möglich, durch die Bearbeitung von Feldfunktionen Objekte zu erstellen. Eq. 28 Note that in cases such as Figure 3-2 : 18 99% draft Version
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<strong>IEA</strong> SHC Task 38<br />
Monitoring Procedure<br />
SF Q1<br />
= hotstorage Q1 +<br />
Eq. 26<br />
Q2S<br />
Q_sol<br />
E1<br />
Collector field<br />
E2<br />
Q1<br />
Hot storage<br />
Q1S<br />
Q2S<br />
Q2D<br />
E3<br />
Back up he<strong>at</strong> source<br />
(conventionally powered<br />
or RES or waste he<strong>at</strong>…)<br />
Figure 3-2 Connection between the he<strong>at</strong> back-up system <strong>and</strong> the solar collectors: direct use<br />
of the he<strong>at</strong> supplied by the back-up system<br />
If the he<strong>at</strong> delivered by the back-up system is also directly used (Figure 3-2), the output from<br />
the storage due to the solar collectors is given by:<br />
⎛ Q1 ⎞<br />
Q1s * ⎜ ⎟<br />
⎝ Q1 + Q2S ⎠<br />
[ ] kWh th<br />
Eq. 27<br />
Hence the storage solar fraction amounts to:<br />
Fehler! Es ist nicht möglich, durch die Bearbeitung von<br />
Feldfunktionen Objekte zu erstellen.<br />
Eq. 28<br />
Note th<strong>at</strong> in cases such as Figure 3-2 :<br />
18 99% draft Version
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