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LMTD Counter Flow Heat Exchanger (GATE Previous Year Question), Heat and Mass Transfer, GATE Video Lecture | Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

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FAQs on LMTD Counter Flow Heat Exchanger (GATE Previous Year Question), Heat and Mass Transfer, GATE Video Lecture - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

1. What is the LMTD (Log Mean Temperature Difference) in a counter flow heat exchanger?
Ans. The LMTD is a logarithmic average of the temperature difference between the hot and cold fluids in a counter flow heat exchanger. It is used to determine the heat transfer rate and effectiveness of the heat exchanger.
2. How is the LMTD calculated in a counter flow heat exchanger?
Ans. The LMTD is calculated using the formula LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2), where ΔT1 is the temperature difference at one end of the heat exchanger and ΔT2 is the temperature difference at the other end.
3. What is the significance of the counter flow arrangement in a heat exchanger?
Ans. The counter flow arrangement allows for a higher heat transfer efficiency compared to other arrangements, such as parallel flow. It maximizes the temperature difference between the hot and cold fluids, resulting in a more efficient heat transfer process.
4. How does a counter flow heat exchanger work?
Ans. In a counter flow heat exchanger, the hot and cold fluids flow in opposite directions. The hot fluid enters at one end of the exchanger and transfers heat to the cold fluid as they flow towards each other. This arrangement allows for efficient heat transfer due to the temperature difference between the fluids.
5. What are the advantages of using a counter flow heat exchanger?
Ans. Counter flow heat exchangers offer several advantages, including higher heat transfer efficiency, compact design, and lower fouling and scaling issues. They are also more suitable for handling fluids with large temperature differences and are commonly used in industries such as HVAC, power generation, and chemical processing.
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