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Many drainback systems also use a coil-in-tank type of heat exchanger. The
collector water reservoir tank may have a small coil inside it which the storage water
is pumped through. In this case, the hotter fluid is outside the coil, and the cooler
water to be heated is inside the coil.
Shell and Tube
Shell and tube heat exchangers, used for a multitude of other heat transfer
applications, are also found in solar heating systems. The water to be heated
moves through the tubes, and the solar fluid providing the heat passes over the
tubes through the shell. (Figure 2-24)
Shell and tube heat exchangers are made with both double and single wall
construction. Be sure to use a non-toxic solar fluid whenever the heat exchanger is
single wall.
FIGURE 2-24
A Shell and Tube
Heat Exchanger
Courtesy of Young Radiator Company
2.7.6 Storage Tanks. Almost all storage tanks used for solar applications are
pressurized steel tanks. All pressure tanks must have ASME approval. A variety of
linings are used:
o
Glass
o
Stone
o
Epoxy
o
Phenolic resin
o
Cement
o
Galvanized
OPERATION
30
2.7 COMPONENT OPERATION





 


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