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A solar collector has 1000 Btu/min of radiant energy available on a clear sunny day. The collector can transfer 450 Btu/min to a storage tank. What is the efficiency of the system?

I used n= energy-output/energy-input *100

I plugged it all in $\;\dfrac{450}{1000}*\times 100\%$.

I got $45\%$, however on my answer choices it says the answer is $48\%$?

Exact Question. Maybe I used the wrong formula?

A solar collector has 1000 Btu/min of radiant energy available on a clear sunny day. The collector can transfer 450 Btu/min to a storage tank. What is the efficiency of the system?

A. 17%
B. 25%
C. 37%
D. 48%

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    $\begingroup$ There is a typo somewhere. Your calculation is correct. $\endgroup$
    – André Nicolas
    Commented May 18, 2013 at 20:12

1 Answer 1

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You used the correct formula, and your calculation is the correct answer: $45\%$.

There must be a misprint/typo in the solution manual/text.

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  • $\begingroup$ I'll ask the teacher on Wednesday. $\endgroup$
    – Jon
    Commented May 18, 2013 at 20:25
  • $\begingroup$ You did everything correctly, so no worries with your answer. Yes, tell the teacher. S/he will want to know! $\endgroup$
    – amWhy
    Commented May 18, 2013 at 20:28
  • $\begingroup$ Nice for OP to get ack! +1 $\endgroup$
    – Amzoti
    Commented May 19, 2013 at 0:46

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