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4.2-1. Mean Thermal Conductivity in a Cylinder. Prove that if the thermal conductivity varies linearly with temperature as in Eq. (4.1-11), the proper mean value k, to use in the cylindrical equation is given by Eq. (4.2-3) as'in a slab. 4.2-2. Heat Removal of a Cooling Coil. A cooling coil of 1.0 ft of 304 stainless-steel tubing having an inside diameter of 0.25 in. and an outside diameter of 0.40 in. is being used to remove heat from a bath. The temperature at the inside surface of the tube is 40°F and is 80 F on the outside. The thermal conductivity of 304 stainless steel is a func- tion of temperature: k = 7.75 + 7.78 × 10-T where k is in btu/h ft F and T is in F. Calculate the heat remosal in btu/s and watts. Ans, 1.225 btu/s. 1292 W 4.2-1. Mean Thermal Conductivity in a Cylinder. Prove that if the thermal conductivity varies linearly with temperature as in Eq. (4.1-11), the proper mean value k, to use in the cylindrical equation is given by Eq. (4.2-3) as'in a slab. 4.2-2. Heat Removal of a Cooling Coil. A cooling coil of 1.0 ft of 304 stainless-steel tubing having an inside diameter of 0.25 in. and an outside diameter of 0.40 in. is being used to remove heat from a bath. The temperature at the inside surface of the tube is 40°F and is 80 F on the outside. The thermal conductivity of 304 stainless steel is a func- tion of temperature: k = 7.75 + 7.78 × 10-T where k is in btu/h ft F and T is in F. Calculate the heat remosal in btu/s and watts. Ans, 1.225 btu/s. 1292 W
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