Q2/ A counter-flow double-pipe heat exchanger is to heat water from 20 °C to 80 °C at a rate of 1.2 kg/s. 100 The heating is to be accomplished by geothermal water so available at 160 °C at a mass flow rate of 2 kg/s. The Ceig/Cmax0 inner tube is thin-walled and has a diameter of 1.5 cm. 60 The overall heat transfer coefficient of the heat exchanger is 640 W/m.C. Using the effectiveness- 40 Shell fluid NTU method determine the length of the heat 20 exchanger required to achieve the desired heating And Tube fluid if we change one tube pass by 4 tube passes what is the new total surface tubes areal and how that would affect Number of transfer units NTU = A,UICio %3D the efficiency of heat exchanger? (c) One-shell pass and 2, 4, 6) tube passes ... NTU In Cpwater- 4.18 kJ/kg•C ,Cgeothermal =4.31 kJ/kg-C Effective ness e.

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