A counterflow, concentric tube heat exchanger is designed to heat water from 34 to 80 deg C using hot oil,which is supplied to the annulus at 174 deg C and discharged at 140 deg C. The thin-walled...

A counterflow, concentric tube heat exchanger is designed to heat water from 34 to 80 deg C using hot oil,which is supplied to the annulus at 174 deg C and discharged at 140 deg C. The thin-walled inner tube has a diameter of Di=34 mm and the overall heat transfer coefficient is 500 W/m2. K. The design condition calls for a total heat transfer rate of 4400 W. What is the length of the heat exchanger? Select one: a. 0.82485 b. 1.0478 c. 0.95849 d. 0.7013

Extracted text: A counterflow, concentric tube heat exchanger is designed to heat water from 34 to 80 deg C using hot oil,which is supplied to the annulus at 174 deg C and discharged at 140 deg C. The thin-walled inner tube has a diameter of Di=34 mm and the overall heat transfer coefficient is 500 W/m2. K. The design condition calls for a total heat transfer rate of 4400 W. What is the length of the heat exchanger? Select one: a. 0.82485 b. 1.0478 c. 0.95849 d. 0.7013