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 * hotstorage [ kWh ] Q 6 = SF *Q6 Eq. 39 th On the basis of Eq. 37, Eq. 38 Eq. 39, the total solar load contribution is given by: * * * * [ kWh ] Qtot = Q3 + Q4 + Q6 Eq. 40 th Hence the solar heat management efficiency is calculated according to: * Qtot η heat _ solrad = Eq. 41 Qsol This means that the solar energy unexploited is: Q _ solunex * = Qsol − Qtot Eq. 42 3.3.3 General key energy performance figures in the 3 rd monitoring level In the third level all the flows listed in Table 1, Table 2 and Table 3 are required to carry out deep analysis. First of all, the fractional energy saving (Fsav) is calculated according to the method which was elaborated in the IEA SHC Task 26 for solar combisystems and extended in the IEA SHC Task 32 for solar heating and cooling systems. This method requires the PER of a conventional system to be calculated according to the formula already presented in the 1 st level: PERref = ε Q3a + Q10a + Q4 + ∆AHU Qboiler, ref Qcooling, ref + fossil * ηboiler SPFref * εelec Eel, ref + ε elec ⎡ kWh ⎤ th ⎢ ⎥ ⎢⎣ kWhpe ⎥⎦ Eq. I In comparison with the 1st level, in the 3rd level the calculation of some items included in the PERref is enabled in different ways thanks to the presence of many sensors. 21 99% draft Version
IEA SHC Task 38 Monitoring Procedure For instance, the calculation of Eel,ref can be more accurate thanks to the presence of the sensors E3. In fact, with reference to the Eq. 18 below repeated, the assumed 0.02 kWhel/kWhth can be substituted with a real measurements of the electrical consumption for operating the boiler and the pump between the boiler and the storage. Such real value is given by the ratio between E3 and the overall production of the boiler. E = 0.02*(Q3a + Q3b + Q4 + Q el _ ref loss _ ref ) [ kWh ] elec Eq. 43 In case of DEC-AHU, it must be considered the additional pressure drops of DECcomponents compared to a conventional AHU. E vent,el ref = E DEC,el SHC ⋅ REF REF ( ∆Psupply ⋅ V& sup ply + ∆Preturn ⋅ V& return ) DEC DEC ( ∆P ⋅ V& + ∆P ⋅ V& ) supply sup ply return return = E DEC,el SHC ⋅ f REF DEC ( ∆P , ∆P )[ kWh ] elec One more instance is the calculation of the so-labeled Qcooling,ref. It can be calculated in a as follows: Q = Qcooling, missed + Q7 cooling,ref [ kWh ] th Eq. 44 “Qcooling,missed” refers to the cold production of the back-up system of the monitored system, i.e. Q8. This procedure enables to consider in the conventional system the real cold produced by the monitored installation, including losses in the cold tank. If the electricity consumotion of the complete back-up system is not measured, the reference SPF (=2.8) is used to calculate the electricity consumption accordingly. On the other hand, the electrical consumption due to Qcooling,missed can be directly calculated by summing up all the electrical consumptions of the back-up system (pumps and fan included), i.e. E10, E12, E13 and E15 if monitored directly. This enables to have the real electrical consumption of the back up system without assuming for it any SPF. For DEC systems the calculation of Qcooling,missed is based on a different concept, that will be explained in the paragraph 3.3.4. Once the PER,ref is calculated, the fractional saving which evaluates the consumption of the monitored system compared to a conventional system is given by: 22 99% draft Version
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<strong>IEA</strong> SHC Task 38<br />
Monitoring Procedure<br />
For instance, the calcul<strong>at</strong>ion of Eel,ref can be more accur<strong>at</strong>e thanks to the presence of the<br />
sensors E3. In fact, with reference to the Eq. 18 below repe<strong>at</strong>ed, the assumed<br />
0.02 kWhel/kWhth can be substituted with a real measurements of the electrical<br />
consumption for oper<strong>at</strong>ing the boiler <strong>and</strong> the pump between the boiler <strong>and</strong> the storage. Such<br />
real value is given by the r<strong>at</strong>io between E3 <strong>and</strong> the overall production of the boiler.<br />
E = 0.02*(Q3a + Q3b + Q4 + Q<br />
el _ ref<br />
loss _ ref<br />
)<br />
[ kWh ]<br />
elec<br />
Eq. 43<br />
In case of DEC-AHU, it must be considered the additional pressure drops of DECcomponents<br />
compared to a conventional AHU.<br />
E<br />
vent,el<br />
ref<br />
= E<br />
DEC,el<br />
SHC<br />
⋅<br />
REF<br />
REF<br />
( ∆Psupply<br />
⋅ V&<br />
sup ply + ∆Preturn<br />
⋅ V&<br />
return )<br />
DEC<br />
DEC<br />
( ∆P<br />
⋅ V&<br />
+ ∆P<br />
⋅ V&<br />
)<br />
supply<br />
sup ply<br />
return<br />
return<br />
= E<br />
DEC,el<br />
SHC<br />
⋅ f<br />
REF DEC<br />
( ∆P<br />
, ∆P<br />
)[ kWh ]<br />
elec<br />
One more instance is the calcul<strong>at</strong>ion of the so-labeled Qcooling,ref. It can be calcul<strong>at</strong>ed in a<br />
as follows:<br />
Q = Qcooling, missed + Q7<br />
cooling,ref<br />
[ kWh ]<br />
th<br />
Eq. 44<br />
“Qcooling,missed” refers to the cold production of the back-up system of the monitored<br />
system, i.e. Q8. This procedure enables to consider in the conventional system the real cold<br />
produced by the monitored install<strong>at</strong>ion, including losses in the cold tank. If the electricity<br />
consumotion of the complete back-up system is not measured, the reference SPF (=2.8) is<br />
used to calcul<strong>at</strong>e the electricity consumption accordingly.<br />
On the other h<strong>and</strong>, the electrical consumption due to Qcooling,missed can be directly<br />
calcul<strong>at</strong>ed by summing up all the electrical consumptions of the back-up system (pumps <strong>and</strong><br />
fan included), i.e. E10, E12, E13 <strong>and</strong> E15 if monitored directly. This enables to have the real<br />
electrical consumption of the back up system without assuming for it any SPF.<br />
For DEC systems the calcul<strong>at</strong>ion of Qcooling,missed is based on a different concept, th<strong>at</strong><br />
will be explained in the paragraph 3.3.4.<br />
Once the PER,ref is calcul<strong>at</strong>ed, the fractional saving which evalu<strong>at</strong>es the consumption of<br />
the monitored system compared to a conventional system is given by:<br />
22 99% draft Version
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