A shell-and-tube heat exchanger is used for cooling 47 kg/s of a process stream flowing through the tubes from 160°C to 100°C. This heat exchanger has a total of 100 identical tubes, each with an inside diameter of 2.5 cm and negligible wall thickness. The average properties of the process stream are r = 950 kg/m3, k = 0.50 W/m·K, cp = 3.5 kJ/kg·K and m = 2.0 mPa·s. The coolant stream is water (cp = 4.18 kJ/kg·K) at a flow rate of 66 kg/s and an inlet temperature of 10°C, which yields an average shellside heat transfer coefficient of 4.0 kW/m2·K. Calculate the tube length if the heat exchanger has (a) a one-shell pass and a one-tube pass and (b) a one-shell pass and four-tube passes.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
A shell-and-tube heat exchanger is used for cooling
47 kg/s of a process stream flowing through the tubes
from 160°C to 100°C. This heat exchanger has a total of
100 identical tubes, each with an inside diameter of 2.5 cm
and negligible wall thickness. The average properties of
the process stream are r = 950 kg/m3, k = 0.50 W/m·K,
cp = 3.5 kJ/kg·K and m = 2.0 mPa·s. The coolant stream is
water (cp = 4.18 kJ/kg·K) at a flow rate of 66 kg/s and an
inlet temperature of 10°C, which yields an average shellside
heat transfer coefficient of 4.0 kW/m2·K. Calculate the
tube length if the heat exchanger has (a) a one-shell pass
and a one-tube pass and (b) a one-shell pass and four-tube
passes.
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