| As the sun
shines on the collector, the water inside the
collector flow-tubes is heated. As it heats, this
water expands slightly and becomes lighter than
the cold water in the solar storage tank mounted
above the collector. Gravity then pulls heavier,
cold water down from the tank and into the
collector inlet. The cold water pushes the heated
water through the collector outlet and into the
top of the tank, thus heating the water in the
tank.
Figure 6
A thermosiphon
system requires neither pump nor controller. Cold
water from the city water line flows directly to
the tank on the roof. Solar heated water flows
from the rooftop tank to the auxiliary tank
installed at ground level whenever water is used
within the residence.
This system features a thermally operated valve
that protects the collector from freezing. It also
includes isolation valves, which allow the solar
system to be manually drained in case of freezing
conditions, or to be bypassed completely. |
Sunday August 01, 2010 - 12:06 AM
