Question: Water at 60°F is heated by passing it through 0.75-ininternal-diameter thin-walled copper tubes. Heat is supplied to the water by steam that condenses outside the copper tubes at 250°F. If water is to be heated to 140°F at a rate of 0.4 lbm/s, determine
(a) the length of the copper tube that needs to be used and
(b) the pumping power required to overcome pressure losses. Assume the entire copper tube to be at the steam temperature of 250°F.