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%
You used the correct formula, and your calculation is the correct answer: $45\%$.
There must be a misprint/typo in the solution manual/text.