Question 1 of 20
Q
Which of the following methods is typically employed in the design of waste heat boilers to obtain maximum heat transfer, while maintaining low overall weight?
A
Feed water is preheated in a separately fired economizer.
B
An external superheater unit is located above the boiler in the gas passages.
C
An unfired exhaust gas preheater is added to increase the heat transfer rate.
D
Steel fins are installed on the generating tube surfaces to increase the effective surface area.
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Question 1 / 205eccefa2bacbc34ba4d47b9b
Question 1 of 205eccefa2bacbc34ba4d47b9b

Which of the following methods is typically employed in the design of waste heat boilers to obtain maximum heat transfer, while maintaining low overall weight?

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Question 1 of 20
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Which of the following methods is typically employed in the design of waste heat boilers to obtain maximum heat transfer, while maintaining low overall weight?

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🔍 Key Concepts

• Design goals of waste heat boilers on ships (light weight but high heat recovery) • How heat transfer area affects boiler efficiency • Common use of extended surfaces (fins) vs. adding more separate heat exchangers

💭 Think About

• Which option actually changes the boiler’s own heating surface so that you get more heat transfer without making the whole unit much heavier or bulkier? • Which choices simply add extra equipment or stages, rather than improving the basic tube-surface effectiveness? • Think about what designers do when they want more heat transfer from the same gas flow path and roughly the same envelope size.

✅ Before You Answer

• Identify which choice directly increases effective heating surface area of the existing boiler tubes. • Check which options would likely add significant extra weight and complexity rather than minimizing it. • Ask yourself which method is standard practice in exhaust gas / waste heat boiler design to get more heat from hot gas with minimal added mass.