The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
Correct answer: C. 85
- A. 50
- B. 65
- C. 85
- D. 99
Explanation
Air or fuel-gas recuperators can achieve thermal efficiencies of roughly 85 percent under favourable operating conditions. The values 50 and 65 percent are lower typical efficiencies, while 99 percent is unrealistically high for practical furnace heat exchangers.
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