Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?
Correct answer: B. 650
- A. 250
- B. 650
- C. 850
- D. 1000
Explanation
SiC ceramic recuperators tolerate much higher temperatures than metallic units, but their higher cost becomes economical when combustion air is preheated above about 650°C. Below this level, metallic recuperators are generally more economical.
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