Engineering :: Renewable Sources of Energy

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Which of the following is not a good way to provide freeze protection for a flat-plate collector system?

[A].	Use of movable insulation to cover the collector	[B].	Drain the collector when it is not operating during periods of low ambient temperatures
[C].	Circulate an antifreeze solution rather than water	[D].	Increase the rate of water flow through the collector by a factor of 2 leaving it on at all times

Answer: Option D