C o s t – E f f e c t i v e n e s s M e a s u r e m e n t M o d e l
239
Figure 20: Energy demand, CO
2
emissions and operating cost for space heating systems with 4kWp
PV
The type of ducts used for an MVHR system also affects the energy use (Fig.21).
Figure 21: Effect of duct types on energy demand, CO
2
emission and operating cost
OPT 1
OPT 23
OPT 26
OPT 32
Delivered energy (kWh/year)
-24.43
2946.4
188.73
6209.9
CO2 Emission ( kg/year)
-52.06
-164.1
58.14
-972.9
Primary Energy ( kWh/ year)
-71.31
-1212
551.09
3557
Annual Operating Cost ( £/year)
-2.8
11.79
21.63
158.58
-2000
-1000
0
1000
2000
3000
4000
5000
6000
7000
Unit Numbers
OPT 1
OPT 17
OPT 18
OPT 19
Delivered energy (kWh/year)
-24.43
416.5
146.07
576.53
CO2 Emission ( kg/year)
-52.06
175.9
36.09
258.64
Primary Energy ( kWh/ year)
-71.31
1216.2
426.55
1683.5
Annual Operating Cost ( £/year)
-2.8
47.73
16.74
66.07
-200
0
200
400
600
800
1000
1200
1400
1600
1800
Unit Numbers
