1. If the tube inside diameter is 0.300 in., find a for the tube-side flow for surface 8.0-iT.
2. A surface 8.0-i T is used as a heat-exchanger core. A cubic section of 1 ft3 is used. If hair = 10 Btu/hr-ftl-oF and hw = 400 Btu/hr-ft2-oF,evaluate U A. The fin material is aluminum; tube thickness is 0.01 in.