Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Outlent temperature of both the hot and cold fluid are same
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
None of these
Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)

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Heat Transfer
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Parallel flow with process stream on tube side
Parallel flow with process stream on shell side
Counter flow with process stream on shell side
Counter flow with process stream on tube side

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