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Heat Transfer
Convection & Radiation
GATE 2016
Medium

For a heat exchanger, ΔTmax is the maximum temperature difference and ΔTmin is the minimum temperature difference between the two fluids, LMTD is the log mean temperature difference, and Cmin/Cmax are the minimum/maximum heat capacity rates. The maximum possible heat transfer (Qmax) between the two fluids is

  • ACmin · LMTD
  • Cmin · ΔTmax
  • CCmax · ΔTmax
  • DCmax · ΔTmin

Explanation

In the effectiveness-NTU method, Qmax = Cmin × ΔTmax — the maximum possible heat transfer is limited by whichever fluid has the smaller heat capacity rate, over the full inlet temperature difference between the two streams.

Source: GATE ME 2016 Set-3 (2016)

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