E x a m i n i n g C o s t – E f f e c t i v e n e s s o f P V / T M V H R S y s t e m s
629
specific fan power and efficiency variations that range from relatively low to high levels
(Table 6). The selected products were studied in order to identify the effects on energy
consumption, operating energy cost and carbon dioxide (CO
2
) emission levels. Moreover,
the assessment extended to a situation that the MVHR products are also combined with
heating and micro power generating systems such as a PV system. In this study, a
combi (combination) boiler (‘Fonderie Sime SpA’) has been considered as the standard
heater of the house in question. The combi-boiler selected runs under mains gas and the
efficiency was estimated at 90.3%. As for PV, a 4kWp system was selected assumed to
be mounted on south oriented roof with a tilt angle of 30
o
. The 4kWp PV coverage was
considered to be 28.57m
2
(8m in width & 3.58m in length) accompanied by the ventilated
roof air flow of 0.5m/s or 432m
3
/h. The potential thermal energy generation of the 14%
efficient PV/T roof based in Scotland was considered to be 3,440 kWh per annum
(Noguchi et al. 2011).
PRODUCT
NUAIRE
MRBOX95-
WH1
Paul-
Novus
300
Paul-
Focus 200
Airflow
Duplexvent
230EC
MTD
Solutions
MTD-
ERV365/350
MTD
Solutions
MTD-
ERV600
SFP
(W/l/s)
0.4
0.61
0.76
1.2
0.68
0.77
EFFICIENCY
(%)
91
93
94
83
84
88
DUCT
Rigid
Rigid
Rigid
Rigid
Flexible
Flexible
Table 6: Profile of MVHR products selected
In total, 19 options were developed for the assessment, shown below:
Option 1:
Boiler (combi)
Option 2:
Boiler (combi) + MVHR System (NUAIRE MRBOX95-WH1)
Option 3:
Boiler (combi) + MVHR System (NUAIRE MRBOX95-WH1) + PV electricity (PV e)
Option 4:
Boiler(combi)+MVHR System (NUAIRE MRBOX95-WH1) + PV e + PVthermal (PV t)
Option 5:
Boiler (combi) + MVHR System (Paul- Novus 300)
Option 6:
Boiler (combi) + MVHR System (Paul- Novus 300) + PV e
Option 7:
Boiler (combi) + MVHR System (Paul- Novus 300) + PV + PV t
Option 8:
Boiler (combi) + MVHR System (Paul- Focus 200)
Option 9:
Boiler (combi) + MVHR System (Paul- Focus 200) + PV e
Option 10:
Boiler (combi) + MVHR System (Paul- Focus 200) + PV e + PV t
Option 11:
Boiler (combi) + MVHR System (Airflow Duplexvent 230EC)
Option 12:
Boiler (combi) + MVHR System (Airflow Duplexvent 230EC) + PV e
Option 13:
Boiler (combi) + MVHR System (Airflow Duplexvent 230EC) + PV e + PV t
Option 14:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV365/350)
Option 15:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV365/350) + PV e
Option 16:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV365/350) + PV + t
Option 17:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV600)
Option 18:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV600) + PV e
Option 19:
Boiler (combi) + MVHR System (MTD Solutions MTD-ERV600) + PV e + PV t
