3 answer what u can neatly plz htp

4.5) A double-pipe heat exchanger consists of two hairpins connected in series. Each hairpin is 20 ft long with the following configuration: The petroleum fraction of Problem 4.2 will flow in the annulus at ate of 20,000lb/h. (a) Calculate the heat-transfer coefficient, h0, for the annulus. (b) Calculate the total pressure drop, P0, for the annulus. Ans. (a) 94Btu/hft2F. (b) 3.6psi