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3.2. Working principle of solar water heater
The vacuum tubes absorb the solar energy, and aluminum fin pass the heat energy
to the heat pipe. The liquid medium in the heat pipe is heated by the heat energy, and
then turns into the gas medium. The gas medium flows up to the top of the heat pipe
and transfer the energy to the cold water in the tank, at the same time the gas medium
turns into the liquid one and flows down. The liquid medium keeps recycling and the
water in the tank will become hot.
