
520 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
prohibit raised-tank locations. In residences, collectors are normally mounted on the roof,
and tanks mounted above the high point of the collector can easily become the highest
point in a building. Practical considerations often do not permit this application.
Example 9.1
Determine the “pressure difference” available for a thermosyphon system with 1 m
high collector and 2 m high “legs.” The water temperature input to the collector is 25°C,
and the collector output temperature is 35°C. If the overall system loss “velocity” factor (K)
is 15.6, estimate the system o