Please answer all parts

Consider a water tank where heat is emitted from steam flowing throw horizontal pipes submerged in the water- by natural convection. The pipes are 3-in Schedule 40 steel. The water is at 80F and the pipe outside wall temperature is 190F. The steam is at atmospheric pressure and assume it has heat transfer coefficient of 2,000 Btu/hr.ft2.F.

a.)Estimate the average heat transfer coefficient by natural convection (Btu/hr.ft2.F). Assume log Gr Pr is larger than 4 to use the empirical equation. b) Find the overall heat transfer coefficient based on the outside area of the pipes (Btu/hr.ft2.F). c) What is the rate of heat transfer to the water in Btu per hour per foot of pipe length?