
617Energy Storage
© 2008 Taylor & Francis Group, LLC
230 L/day (60 gal/day) for a family of three, 48.3 MJ/day (46,000 Btu/day) is needed. If the
collector delivers 6900 kJ/m
2
, a collector with a size of approximately 7 m
2
is needed. This
collector is about 1/10th the size of a collector required for heating a typical building in the
midlatitudes. A rule of thumb is that 1 m
2
of collector is required for each 30 L of hot water
to be delivered. The storage tank should be large enough to hold about a 2 day supply of
hot water, or about 500 L for a family of three.
Thermal storage tanks must be insulated to control heat loss. If a storage tank is ...