A pipeline is constructed by a proposed material M with thermal conductivity of 0.0015 W/(m-K) to transfer fluid from one process equipment to another. Suppose the pipeline has a length of 20 m and an...

Please answer A

Extracted text: A pipeline is constructed by a proposed material M with thermal conductivity of 0.0015 W/(m-K) to transfer fluid from one process equipment to another. Suppose the pipeline has a length of 20 m and an inner radius of 0.0254 m. The inner wall temperature of the pipeline is assumed to be the same as the fluid temperature at 440°C, while the heat loss to surroundings is at 70 W. a) Determine the thickness of the pipeline if the outer wall temperature of the pipeline must be maintained at 300°C. b) Suppose there are four alternative materials with reduced costs that can be utilized to construct the pipeline instead of material M. The four materials with their thermal conductivity and costs are listed in Table 2. An additional design factor to consider is that the outer wall temperature of the pipeline must never be higher than 310°C. Using the same thickness as determined in part (a), evaluate which of the four materials should be chosen to construct the heating coil. Table 2 Material Thermal conductivity (W/m K) Cost per unit volume ($) A 0.0020 100 B 0.0018 300 0.0014 400 D 0.0012 200