In a drain back solar water heating system – McqOptions

MCQOPTIONS

1.	In a drain back solar water heating system
A.	the water in the heat exchanger is recycled
B.	the water is heated in collectors only during times when there is available heat
C.	at the collector, the mixture of water and propylene-glycol is heated and returned to a solar storage tank
D.	there is an expansion tank with enclosed air chamber to assist water draining
Answer» C. at the collector, the mixture of water and propylene-glycol is heated and returned to a solar storage tank

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In a drain back solar water heating system