Chemical Engineering > GATE 2019 > Heat Exchangers
Stream A with specific heat capacity CPA = 2000 J/(kg K) is cooled from 90 °C to 45 °C in a concentric double pipe counter current heat exchanger having a heat transfer area of 8 m2. The cold stream B of specific heat capacity CPB = 1000 J/(kg K) enters the exchanger at a flow rate 1 kg/s and 40 °C. The overall heat transfer coefficient U = 250 W/(m2 K). Assume that the mean driving force is based on the arithmetic mean temperature difference, that is, [ΔT]AMTD = (TA,in + TA,out)/2 - (TB,in + TB,out)/2 where Ti,in and Ti,out refer to the temperature of the ith stream (i = A, B) at the inlet and exit, respectively. The mass flow rate of stream A (in kg/s), is ______ (rounded off to two decimal places).
Correct : 0.31
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