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 COP el,overall Q3a + Q10a + Q4 + ∆H = Eelec,overall AHU ⎡ ⎢ ⎣ kWh kWh th elec ⎤ ⎥ ⎦ Eq. 10 At this monitoring level, to calculate the Eelec,overall is not needed to have all the relevant electricity meters installed, but just one meter on the overall consumption of the facility. To calculate the Eelec,tot is then needed at least one overall meter and the measurement of the electrical consumption of the distribution pumps (E4, E5 and E9). In case the monitored system includes a conventional AHU, this is considered as a distribution system and the electricity consumed for fans (E16 and E17) should be subtracted from Eelec,overall too. If the monitored system includes a DEC AHU, only the additional electricity due to special DEC components (see chapter 3.3.2) should be considered in Eelec_overall. So further measurements are needed, or at least pressure drops of the single AHU components must be known to be able to calculate the nominal pressure drops of the DEC AHU and a Reference AHU resulting in a correction factor which is used to estimate the additional electricity consumption of the fans due to the DEC components. Primary energy ratio is calculated for the monitored installation as the ratio of useful heat and/or cold in relation to the primary energy demand. PER _ res = Q3a + Q10a + Q4 + ∆H Q2 _ fossil _ tot Q2 _ RES _ tot + ε * η ε _ RES * η fossil boiler AHU boiler _ RES Eelec, tot + ε elec ⎡ kWh ⎢ ⎢⎣ kWh th pe ⎤ ⎥ ⎥⎦ Eq. 11 Where: Eq. 12 Q 2 _ fossil _ tot = Q2S _ fossil + Q2D _ fossil Q 2 _ RES_ tot = Q2S _ RES + Q2D _ RES Eq. 13 Note that ∆ HAHU has only to be included when the monitored system is based on DEC. In case the monitored system includes a conventional AHU, this is considered as a distribution system and Q3a actually includes the heat which is then transferred to all the distribution system, AHU included. In case back up systems based on renewable energy are installed, the procedure can also evaluate the impact of such RES compared to a conventional system according to: 13 99% draft Version
IEA SHC Task 38 Monitoring Procedure PER _ fossil = Q3a + Q10a + Q4 + ∆AHU Q2 _ fossil _ tot Q2 _ RES _ tot Eelec, tot + + ε * η ε * η ε fossil boiler fossil boiler _ RES elec ⎡ kWh ⎢ ⎢⎣ kWh th pe ⎤ ⎥ ⎥⎦ Eq. 14 In comparison with Eq. 11, Eq. 14 considers Q2 produced from RES as produced by fossil fuel but with the same efficiency of RES technology used. In this way the influence of the much more advantageous primary energy factor for RES is eliminated and the RES-system can be compared with a fossil-system based on the same fuel type (but of course different boiler efficiency is still a weak point which should be kept in mind). Additionally a PER is calculated also for the supposed conventional system according to: PERref = ε Q fossil Q3a + Q10a + Q4 + ∆AHU boiler,ref * η boiler Q + SPF cooling,ref ref * ε elec E + ε el,ref elec ⎡ kWh ⎢ ⎢⎣ kWh th pe ⎤ ⎥ ⎥⎦ Eq. 15 The so called Qboiler,ref not only takes into account the heat load of the monitored installation for heating and DHW purposes but of course includes also the possible heat losses of the storage for DHW in the reference system according to IEA SHC Task26: ENV 12977-1 (2000); (Weiss, Ed. 2003). So, it is defined as: Q = Q3a + Q3b + Q4 + Q boiler,ref loss _ ref [ kWh ] th Eq. 16 Where: Q = 0.00016* loss _ ref 0.75*V D * ( T _ Ta) *8760 [ kWh ] T th Eq. 17 And: V D : average daily hot water consumption (liter / day) T T : set point temperature of the hot water tank (default 52.5 °C) T a : ambient temperature around the hot water tank (default 15 °C) Note that Q3b has to be entered only when the monitored system is based on DEC. In case the monitored system includes a conventional AHU, this is considered as a distribution system and Q3a actually includes the heat which is then transferred to all the distribution system, AHU included. 14 99% draft Version
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<strong>IEA</strong> SHC Task 38<br />
Monitoring Procedure<br />
COP<br />
el,overall<br />
Q3a + Q10a + Q4 + ∆H<br />
=<br />
Eelec,overall<br />
AHU<br />
⎡<br />
⎢<br />
⎣<br />
kWh<br />
kWh<br />
th<br />
elec<br />
⎤<br />
⎥<br />
⎦<br />
Eq. 10<br />
At this monitoring level, to calcul<strong>at</strong>e the Eelec,overall is not needed to have all the relevant<br />
electricity meters installed, but just one meter on the overall consumption of the facility. To<br />
calcul<strong>at</strong>e the Eelec,tot is then needed <strong>at</strong> least one overall meter <strong>and</strong> the measurement of the<br />
electrical consumption of the distribution pumps (E4, E5 <strong>and</strong> E9). In case the monitored<br />
system includes a conventional AHU, this is considered as a distribution system <strong>and</strong> the<br />
electricity consumed for fans (E16 <strong>and</strong> E17) should be subtracted from Eelec,overall too. If<br />
the monitored system includes a DEC AHU, only the additional electricity due to special DEC<br />
components (see chapter 3.3.2) should be considered in Eelec_overall. So further<br />
measurements are needed, or <strong>at</strong> least pressure drops of the single AHU components must<br />
be known to be able to calcul<strong>at</strong>e the nominal pressure drops of the DEC AHU <strong>and</strong> a<br />
Reference AHU resulting in a correction factor which is used to estim<strong>at</strong>e the additional<br />
electricity consumption of the fans due to the DEC components.<br />
Primary energy r<strong>at</strong>io is calcul<strong>at</strong>ed for the monitored install<strong>at</strong>ion as the r<strong>at</strong>io of useful he<strong>at</strong><br />
<strong>and</strong>/or cold in rel<strong>at</strong>ion to the primary energy dem<strong>and</strong>.<br />
PER _ res =<br />
Q3a<br />
+ Q10a<br />
+ Q4<br />
+ ∆H<br />
Q2 _ fossil _ tot Q2 _ RES _ tot<br />
+<br />
ε * η ε _ RES * η<br />
fossil<br />
boiler<br />
AHU<br />
boiler _ RES<br />
Eelec,<br />
tot<br />
+<br />
ε<br />
elec<br />
⎡ kWh<br />
⎢<br />
⎢⎣<br />
kWh<br />
th<br />
pe<br />
⎤<br />
⎥<br />
⎥⎦<br />
Eq. 11<br />
Where:<br />
Eq. 12<br />
Q 2 _ fossil _ tot = Q2S _ fossil + Q2D _ fossil<br />
Q 2 _ RES_ tot = Q2S _ RES + Q2D _ RES<br />
Eq. 13<br />
Note th<strong>at</strong> ∆ HAHU<br />
has only to be included when the monitored system is based on DEC. In<br />
case the monitored system includes a conventional AHU, this is considered as a distribution<br />
system <strong>and</strong> Q3a actually includes the he<strong>at</strong> which is then transferred to all the distribution<br />
system, AHU included.<br />
In case back up systems based on renewable energy are installed, the procedure can also<br />
evalu<strong>at</strong>e the impact of such RES compared to a conventional system according to:<br />
13 99% draft Version
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