GATE ME 2016 Set 3 — Question 28
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Heat Transfer → Heat Exchangers → Effectiveness-NTU Method
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Question
For a heat exchanger, is the maximum temperature difference and is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. and are the minimum and the maximum heat capacity rates. The maximum possible heat transfer () between the two fluids is
Correct answer
(B) Cₘᵢₙ Δ Tₘₐₓ
Solution
The maximum possible heat transfer rate () in a heat exchanger is defined as the heat transfer that would occur if the fluid with the minimum heat capacity rate () underwent the maximum possible temperature difference available in the exchanger, which is the difference between the inlet temperatures of the hot and cold fluids (). Thus, .
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