Viessmann VITOSOL 200-FM SV2F Design Manual page 68
Flat plate solar collectors
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Design and Operation
System for DHW Heating and Central Heating Backup
Legend
A Central heating demand for a house
(conventional housing stock)
B Central heating demand for a low energy house
C DHW demand
D Solar yield at 53.8 ft
E Solar yield at 161.5 ft
General sizing guidelines for DHW heating and central heating systems
Number of
Occupants
2
3
4
5
6
7
8
68
2
(5 m
2
) absorber area
2
(15 m
2
) absorber area
Daily DHW demand in USG (L)
[at 120°F (50°C)]
30 (115)
45 (170)
60 (230)
75 (280)
90 (340)
105 (400)
120 (450)
(continued)
For low energy houses [space and DHW heat demand
less than 1,836 MBH/ft
2
coverage of up to 35%, relative to the total energy
demand, including DHW heating, can be achieved
according to this sizing. For buildings with a higher heat
demand, the coverage will be much lower.
Commercially available solar simulation software programs
can be used for the exact calculation. Contact your
Viessmann sales representative for a customized design
and sizing analysis for your project.
Buffer tank capacity in
USG (L)
200 (750)
250 (950)
300 (1150)
Solar System Design Guide
(50 kWh/m
2
) per annum], solar
Number of
Vitosol 200-FM Collectors
4
5
6
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