Q1) (25 points) Cold water moves at a rate of m=0.2 kg/s through a 5 mm diameter horizontal tube submerged in a large hot water bath maintained at 80C. Convection heat transfer coefficient outside of the tube is 1658 W/mK. The cold water enters the tube at 25 C and leaves at 39.C. (Tube is made of commercial steel) a) Estimate the length of the tube b) What is the average surface temperature of the tube, Ts ? c) What is the required pump power to move cold water through the tube? Hint: Neglect tube wall thickness, assume fully developed flow, you can assume Ts between 30-C- 40-C Cold water Tmi= 25C m =0.2 kg/s Stagnant water T-80C O D=0.005 m L=? Tmo= 39C