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 Q2 _ total sum = Q2S _ fossil + Q2D _ = Q2 _ fossil + Q2 _ RES = Q2S + Q2D fossil + Q2S _ RES + Q2D _ RES Eq. 29 One special application of the Eq. 28 is when the heat from the back up source is only directly used, i.e. [ ] Q 2S _ fossil + Q2S _ RES = Q2S = 0 kWh th Eq. 30 Under Eq. 30, Eq. 28 becomes: SF Q1s = hotstorage Q1 + Eq. 31 Q2D The losses through the buffer tank are calculated as the difference between the input and the output, if the latter is known. Q _ loss _ stge = (Q1 + Q2S _ fossil + Q2S_ RES) − (Q1S) [ ] kWh th Eq. 32 In case, the output of the storage tanks is not known and the buffer tank is shared with the heat back-up system, the efficiency of the storage can be estimated as follows: Q _ loss _ stge = (Q1 + Q2S _ fossil + Q2S_ RES) − (Q3a + Q4 + Q3b + Q6) [ ] kWh th Eq. 33 In the considered case, Q_loss_stge coincides with the overall losses in the system, which are given by: 19 99% draft Version
IEA SHC Task 38 Monitoring Procedure Q _ loss _ sys = (Q1 + Q2 _ total sum) − (Q3a + Q4 + Q3b + Q6) [ ] kWh th Eq. 34 On the basis of the losses calculated in Eq. 33 and Eq. 34, the efficiency of the storage and the efficiency of the system are calculated according to: ( Q1 + Q2S _ fossil + Q2S _ RES) − Q _ loss _ stge η stge = ( Q1 + Q2S _ fossil + Q2S _ RES) Eq. 35 (Q1 + Q2 _ total sum) − Q _ loss _ sys η sys = Eq. 36 (Q1 + Q2S_ fossil + Q2S _ RES) The solar heat management efficiency is defined as the rate between the “solar load contribution” and the solar availability (Eq. 41). The solar load contribution refers to the amount of load energy which is fully covered by solar energy. I.e. the solar space heating contribution is given by: * Q 3 = SF * (Q3a + Q3b) hotstorage [ kWh ] th Eq. 37 The solar DHW contribution is: * Q 4 = SF hotstorage *Q4 [ kWh ] th Eq. 38 The solar cooling contribution is: 20 99% draft Version
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<strong>IEA</strong> SHC Task 38<br />
Monitoring Procedure<br />
Q _ loss _ sys = (Q1 + Q2 _ total sum) − (Q3a + Q4 + Q3b + Q6)<br />
[ ] kWh th<br />
Eq. 34<br />
On the basis of the losses calcul<strong>at</strong>ed in Eq. 33 <strong>and</strong> Eq. 34, the efficiency of the storage <strong>and</strong><br />
the efficiency of the system are calcul<strong>at</strong>ed according to:<br />
( Q1<br />
+ Q2S<br />
_ fossil + Q2S<br />
_ RES)<br />
− Q _ loss _ stge<br />
η stge =<br />
( Q1<br />
+ Q2S<br />
_ fossil + Q2S<br />
_ RES)<br />
Eq. 35<br />
(Q1 + Q2 _ total sum) − Q _ loss _ sys<br />
η sys =<br />
Eq. 36<br />
(Q1 + Q2S_ fossil + Q2S _ RES)<br />
The solar he<strong>at</strong> management efficiency is defined as the r<strong>at</strong>e between the “solar load<br />
contribution” <strong>and</strong> the solar availability (Eq. 41).<br />
The solar load contribution refers to the amount of load energy which is fully covered by<br />
solar energy. I.e. the solar space he<strong>at</strong>ing contribution is given by:<br />
*<br />
Q 3 = SF * (Q3a + Q3b)<br />
hotstorage<br />
[ kWh ]<br />
th<br />
Eq. 37<br />
The solar DHW contribution is:<br />
*<br />
Q 4 = SF<br />
hotstorage<br />
*Q4<br />
[ kWh ]<br />
th<br />
Eq. 38<br />
The solar cooling contribution is:<br />
20 99% draft Version
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