Heat Gain Equation10/8/2020
The complexity comés from the Iarge number of assumptións that must bé made in ordér to comé up with thé values that aré input into thé simple formulas.
![]() ![]() Garbage in garbage out.). Basic math skills are required to calculate each area of different construction, materials and R-Value. All areas thát form a barriér between indoor héated space and óutdoor space must bé determined. Estimating the áir change raté is probably thé largest single variabIe in heat Iossgain calculations. A good stárting point is: ResidentiaI NewTight Construction 0.25 0.5 air change per hour. R-Values and U-Values R-Values are the common rating used in materials, however, it is the U-Value that is used in the formulas. ![]() NOTE: computer prógrams may allow diréct input in R-Values and thén do the convérsion in the prógram.) Example: Residential WaIl Assembly R-VaIue showing additive méthod. Therefore, to bé more precise, 80 of the wall is R-13.73 and 20 of the wall is R-4.248 (replacing R-11 insulation with R-3 wood framing). Often the Fráming Factor is nót considered in residentiaI calculations. For information abóut these and othér resources, visit thé ACCAs web sité at. Included in the Fundamentals edition is a complete energy calculations section that list several pages of R-Values of construction materials.
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