Which of the following is a circulating fluid in evacuated flat-plate solar collectors?
A. Water
B. Steam
C. Nitrogen
D. Hydrogen
Answer:B
Which of the following is a circulating fluid in evacuated flat-plate solar collectors?
A. Water B. Steam C. Nitrogen D. Hydrogen
Explanation: Evacuated flat-plate solar collectors are a more recent technology. It uses steam as its circulating fluid. Nitrogen and hydrogen are not used as circulating fluid. Water is mainly used in flat-plat collectors.