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A solar collector receiving solar radiation at the rate of 0.6 kW/m2 transforms it to the internal energy of a fluid at an overall efficiency of 50%. The fluid heated to 350 K is used to run a heat engine which rejects heat at 313 K. If the heat engine is to deliver 2.5 kW power, the minimum area of the solar collector required would be
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- 83.33 m2
- 16.66 m2
- 39.68 m2
- 79.36 m2
- 83.33 m2
Correct Option: A
10. Given; Receiving solar radiation at the rate of 0.6 kW/m2
| Internal energy of fluid after absorbing solar radiation = 0.6 × | kW / m2 = 0.3 kW / m2 | |
| 2 |
| ηengine = 1 - | = 0.1 | |
| 350 |
| 0.1 = | ||
| Q1 |
| ∴ Q1 = | = 25 k W | |
| 0.1 |
Let A be minimum area of collector
∴ Q1 = 0.3 × A or 25 kW = 0.3 kW/m2
| or A = | = 83.33 m2 | |
| 0.3 |
