Question

A heat exchanger uses oil (cp = 1880 J kg-1 K-1) at an initial temperature of...

A heat exchanger uses oil (cp = 1880 J kg-1 K-1) at an initial temperature of 205°C to heat up water with heat capacity of 1 kcal kg-1 K-1, and density = 0.998 g cm-3, flowing at 0.00376 m3 min-1 from 16°C to 44°C. The configuration of the heat exchanger is in countercurrent. The oil mass flow rate is 270 kg h-1.
(1 cal = 4.18 J)

(i)        What is the heat transfer area required for an overall heat transfer coefficient of 0.34 kW m-2 K-1)?   

(ii)       Determine the number of transfer units (NTU).

(iii)      Calculate the effectiveness of the heat exchanger.                          

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