IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38
Monitoring Procedure
Qboiler
QRES
E Q
el cooling,missed
+ + +
εfossil
⋅ηboiler
εRES
⋅ηRES
εelec
SPF⋅εelec
fsav.shc = 1−
Eq. 45
Qboiler,ref
E Q
el,
ref cooling,ref
+ +
ε ⋅η ε SPF ⋅ε
fossil
boiler,ref
elec
ref
elec
Which is equivalent to:
fsav.shc
PER
= 1−
PER
ref
RES
Eq. 46
If it is meant to exclude the effect of the RES, the fractional saving can be also calculated
considering the PERfossil of the monitored installation.
fsav.shc
ε
Q
⋅η
boiler
fossil boiler fossil RES elec
elec
ref
= 1−
= 1−
Eq.
Qboiler,ref
E Q
el,
ref cooling,ref
PER
47
fossil
ε
fossil
⋅η
+
ε
boiler,ref
QRES
⋅η
+
ε
elec
E
+
ε
el
+
SPF
Q
+
SPF⋅ε
ref
cooling,missed
⋅ε
elec
PER
The fractional solar consumption is defined as the ratio between the available and useful
solar radiation (I [kW/m 2 ]) on the aperture area (A [m 2 ]) of the collector under investigation
(Qsol = I x A [kWh]) and the reference heat necessary to match the space heating, DHW
and cooling demand on a monthly basis and summed up for a year:
FSC _ SHC =
12
∑
m=
1
⎛ Min(
Q
⎜
⎝ Q
ref
ref
, Q
sol
) ⎞
⎟
⎠
m
Eq. 48
Where Q ref the monthly sum of the heat needed for different purposes. Please note that to
calculate the heat needed by a thermally driven chiller is calculated with a COP th,ref of 0.6 as
default.
23 99% draft Version