The amount of energy loss from a building can be estimated based on knowledge of relative temperatures and the R-value for the building's insulation..
Parameters:
(1) R-value in °K•(square meter)/W
(2) temperature outside in °C or (°K)
(3) temperature inside the building in °C (or °K)
(4) surface area in square meters
thermal conductance = U =
= 1 / R
Units for thermal conductance are W / (°K•(sq m))
heat loss in W =
= (area in square meters) * (temperature difference in °C) * U =
= (area in square meters) * (temperature difference in °C) / (R-value)
where:
• R values in the USA are expressed in (degree F)•(foot square)•h / Btu.
• SIU values for R-value is °K•(square meter)/W. 1 °K•(square meter)/W = 5.67 (degree F)•(foot square)•h / Btu
• 1 Watt = 1 joule per second
To read more or access our algorithms and calculators, please log in or register.
Specialty: Emergency Medicine, Critical Care
