Heat Loss Coefficients - Thermal insulation - Printable Version

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Heat Loss Coefficients - Thermal insulation - navya mathur - 08-14-2014

Heat Loss Coefficients

British Thermal Unit: Btu, the amount of heat needed to raise the temperature of 1 pound of water to 1 degree Fahrenheit.

Coefficient of Thermal Conductivity: k, the amount of heat, in Btu’s, transferred in one hour through 1 sq. ft. of a given material that is 1” thick and has a temperature difference between its surfaces of 1 degree Fahrenheit.

Conductance: C, the amount of heat that will flow through the material in 1 hour / sq. ft. of surface with a 1 degree Fahrenheit of temperature difference.

Resistance: R, the opposite of conductivity or conductance. A good insulation material will have a high R- value.

Total Heat Transmission: U, represents in Btu / sq. ft. / hour with 1 degree temperature difference for a structure which may consist of several materials or spaces.

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