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### PROBLEMS

 4.1-1. Insulation in a Cold Room. Calculate the heat loss per m2 of surface area for a temporary insulating wall of a food cold storage room where the outside temperature is 299.9 K and the inside temperature 276.5 K. The wall is composed of 25.4 mm of corkboard having a k of 0.0433 W/m · K. A1: Ans. 39.9 W/m2 4.1-2. Determination of Thermal Conductivity. In determining the thermal conductivity of an insulating material, the temperatures were measured on both sides of a flat slab of 25 mm of the material and were 318.4 and 303.2 K. The heat flux was measured as 35.1 W/m2. Calculate the thermal conductivity in btu/h · ft · °F and in W/m · K. 4.2-1. Mean Thermal Conductivity in a Cylinder. Prove that if the thermal conductivity varies linearly ...

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