Assume that atmospheric pressure air is heated in a long annulus (250-mm ID & 400-mm OD) by steam condensing at 150C on the inner surface. The velocity of the air is 7 m/s, and its bulk temperature is 42C (average). Properties of dry air at atmospheric pressure are given on the next slide. Assume steady state conditions and that the steam temperature is constant and uniform. a) Find bulk temperate of the air. Show all interpolations and organize your results in a table. b) Calculate the Re number based on the hydraulic diameter of the annulus (Rair). What is the type of flow? Show work. c) Calculate the correction factor d) Calculate the heat coefficient ho of the air. Write down the equation(s) used and show work. e) Sketch the thermal circuit for the heat transfer between the stream and the air.