3. CALCULATION OF CONCENTRIC TUBES HEAT EXCHANGERS

3. 7. Example 1

You need a heat exchanger to cool 20 kg/s of water from 360 K to 340 K, using 25 Kg/s of water entering at 300 K. The global coefficient of heat transmission is constant and equal to 2 kW/m²K. Finding the values of the following:

a) The value of the temperature of cold fluid at the exit (T₂₀).

b) Area of concentric tubes operating in counter.

c) Area of concentric tubes operating in parallel.