Mini-project 2: Superheating Steam Consider a steel pipe containing steam at 100 C going through a superheater as shown in the figure below. 1 m Steam 6.5 m/s Tin = 100 C Exhaust Gases (air) 20 m/s = I = 750 C 11111 The steam pipe is a 1/2" ANSI Schedule 80 pipe with an inner diameter of 0.55 in. and an outer diameter of 0.84 in. It has the following temperature-dependent properties Specific Heat Thermal Conductivity Thermal Diffusivity Temp. K Density kg/m J/kg-K 300 7854 434 W/m-K 60.5 400 487 56.7 600 559 48.0 800 685 39.2 1000 1169 30.0 m/s 1.77 x 10-5 Table 1: Thermal properties of plain carbon steel. extract of table A-3 in Heat and Mass Transfer: Funda- mentals and Applications by engel and Ghajar The steam flows at an average velocity of 6.5 m/s and is at 100 C as it enters the superheater. Steam properties may be assumed to equal those from Table A-16 in the textbook (also provided below). The exhaust gases of a combustion process are used to superheat the steam. The gases are at 750 C and flow over the cylindrical pipe with a freestream velocity of 20 m/s. The properties of the exhaust gases may be assumed to be approximated by those of air as given in Table A-15 of the textbook (also provided below). 1 Conduction through the pipe wall At this point you do not know the temperature of the steel pipe 1. Estimate the temperature of the steel pipe. At this time this is just an educated guess, but you should explain the reasoning behind your educated guess. 2. Find the properties of the steel pipe based on your guessed temperature. You should interpolate as necessary. If you interpolate you must show your work for at least one of the interpolation calculations. 3. What is the thermal resistance of heat transfer radially through the pipe? Please report your answer in K/W.