Question 1 Water enters a heating system at a flow rate of 0.2 kg/s. The system has a thick-walled tube with inner and outer diameters of 16 and 25 mm respectively. The outer tube surface is well insulated, and there is electrical heating within the tube wall which provides a uniform generation of q = 4.7 x106 W/m3. a. If water is heated from 15C to a temperature of 92C, how long must the tube be to achieve the desired outlet temperature? (7) b. If the inner surface of the tube at the outlet is Ts.in = 120C; what is the local convective coefficient at this location? (3) [10] Question 2 Water flowing at a flow rate of 0.2 kg/s through a 15 mm inside diameter pipe enters at a temperature of 25C and exit at 55C. The water is heated by saturated atmospheric steam condensing on the outside of the tube. For a horizontal commercial steel tube 3 m long. Calculate the following: 2.1. The convective coefficient on the water side. (10) 2.2. The convective coefficient on the condensate side. (15) 2.3. The condensation rates. (5) Neglect the conductive resistance across the wall. Assume a fully developed flow