Which of the following are used as absorbers in evacuated-tube solar collectors?
A. Carbon tubes
B. Wooden or metallic tubes
C. Plastic or glass tubes
D. Metallic or glass tubes
Answer:D
Which of the following are used as absorbers in evacuated-tube solar collectors?
A. Carbon tubes B. Wooden or metallic tubes C. Plastic or glass tubes D. Metallic or glass tubes
Explanation: Metallic or glass tubes are used as absorbers in evacuated-tube solar collectors. Wood and plastic are thermal insulators and hence, cannot be used to create passageways for the heat carrying circulating fluid.