Water enters at 20 ℃ at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 60 ℃ by geothermal water that enters the heat exchanger at 145 ℃ at a rate of 0.3 kg/s. The...

Water enters at 20 ℃ at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 60 ℃ by geothermal water that enters the heat exchanger at 145 ℃ at a rate of 0.3 kg/s. The overall heat transfer coefficient of the heat exchanger is 500 W/m2. ℃. The internal diameter of the tube is 1.2 cm. Determine the length of the heat exchanger. The specific heats of the water and geothermal water are given to be 4.18 and 4.31 kJ/kg.℃, respectively. Select one: a. 27.7 m b. 25.5 m c. 30.5 m d. 20.2 m


Extracted text: Water enters at 20 °C at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 60 °C by geothermal water that enters the heat exchanger at 145 °C at a rate of 0.3 kg/s. The overall heat transfer coefficient of the heat exchanger is 500 W/m2. °C. The internal diameter of the tube is 1.2 cm. Determine the length of the heat exchanger. The specific heats of the water and geothermal water are given to be 4.18 and 4.31 kJ/kg.°C, respectively. Select one: а. 27.7 m b. 25.5 m с. 30.5 m d. 20.2 m