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NEW YORK SOLAR
ENERGY ANSWERS
Question 5.
Back to Questions?
TYPES OF SOLAR
COLLECTORS

1.Glazed Flat-Plate Collectors, not used.
A glazed flat-plate collector consists of a shallow
rectangular box with a flat black plate behind a tempered glass
cover. The plate is attached to a series of parallel tubes or
one serpentine tube through which water or another liquid (such
as an antifreeze solution) passes.

2. Evacuated-Tube Collector patented and used by Renewable
Energy Inc. in Long Island
Solar collector evacuated tubes collect and convert sunshine
energy into thermal energy, which is transferred to the central
heat pipes in the tubes through the aluminum fins bridging the
tube inner surfaces and the heat pipes. The copper heat pipes
have tiny amount of purified water sealed in them at
depressurized condition. When heated, the water inside the heat
pipes vaporizes at low temperature (about 30˚C). The vapor
(steam) rises to the pipe tips inserted into the water contained
in the tank. Vapor is cooled down and becomes condensate falling
to the bottom of the pipes. By continuously circulating this
way, heat is carried from outside to the water inside the tank.