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Mechanical Engineering · Q90

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 90

Q90

Log mean temperature difference in case of counter flow compared to parallel flow will be

A.
Same
B.
More
Answer
C.
Less
D.
Depends on other factors

Answer: Option B

Solution

Answer: Option B
Solution:
The larger the LMTD more heat is transferred.
In parallel flow heat exchangers both hot fluid and cold fluid flow in same direction. Counter flow heat exchanger: In counter flow heat exchangers both hot fluid and cold fluid flow in opposite direction.
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