For a heat exchanger, ∆Tmax is the maximum temperature

Home » Heat-Transfer » Heat Transfer Miscellaneous » Question

For a heat exchanger, ∆T_max is the maximum temperature difference and ∆T_min is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. Cmin and C_max are the minimum and the maximum heat capacity rates. The maximum possible heat transfer (Qmax) between the two fluids is

1. C_min LMTD
2. C_min ∆T_max
3. C_max ∆T_max
4. C_max ∆T_min

Correct Option: B

The temperature difference is not for a given fluid but across the fluids and maximum heat transfer occurs for C_min and the temperature difference is equal to (T_hi - T_ci )