In: Other
A double-pipe heat exchanger operating in counter current mode
is to heat a
fluid(Cp 1.7 kJ/kg K) from 50°C to 95°C at a rate of 4.5 kg/s. The
heating is to be
accomplished by hot fluid (Cp=1.97 kJ/kg K) available at 200°C at a
mass flow
rate of 6 kg/s. The inner tube is thin-walled and has a diameter of
4 cm. If the
overall heat transfer coefficient of the heat exchanger is 680
W/m2
°C,
determine the length of the heat exchanger required to achieve the
desired
heating.
Data given:
Plastic 0.4 W/mK
brick 0.72W/m°C
plaster 0.36 W/m°C
cement 1.4 W/m°C
Polyurethane foam 0.025W/m °C
Glass fiber/fiber glass 0.036 W/m °C
Air 0.0198 W/m °C
Copper 380W/m °C
# just take the required data that u need