Question:
The principle of waste heat recovery that involves transferring heat from exhaust gases to the incoming air is:
The principle of waste heat recovery that involves transferring heat from exhaust gases to the incoming air is:
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Recuperation uses a continuous heat exchanger to recover waste heat from exhaust gases and improve system efficiency—no moving thermal mass involved.
Updated On: June 02, 2025
- Combustion
- Recuperation
- Regeneration
- Condensation
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The Correct Option is B
Solution and Explanation
Step 1: Recuperation is a method of waste heat recovery in which heat from hot exhaust gases is transferred to incoming air or fluid using a heat exchanger. This process improves thermal efficiency by preheating the working fluid before it enters the main heating process.
Step 2: Recuperators are typically used in industrial furnaces, boilers, and combustion systems to reduce fuel consumption and emissions. The heat exchange is continuous and occurs through a solid barrier separating the hot and cold fluids.
Why the other options are incorrect:
Step 2: Recuperators are typically used in industrial furnaces, boilers, and combustion systems to reduce fuel consumption and emissions. The heat exchange is continuous and occurs through a solid barrier separating the hot and cold fluids.
Why the other options are incorrect:
- (A) Combustion is a chemical reaction, not a heat recovery method.
- (C) Regeneration also involves heat recovery but typically stores heat temporarily in a thermal mass (like a ceramic bed), then releases it to incoming air in cycles.
- (D) Condensation relates to phase change and is not used in this context.
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