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CSA F280-M90 pdf free download
CSA F280-M90 pdf free download.Determining the Required Capacity of Residential space Heating and Cooling Appliances.
(C) The concept of R5l value is now familiar to the public and, unlike the concept of U value, is easily understood, in that “bigger Is better.
Additional Comments on the 1990 Edition
Table 6 was revised in the 1 990 edition to present a new method for estimating the thermal resistance of normal building assemblies. This method, although more concise and perhaps easier to use, is not as accurate as those of previous editions, and may not provide results that comply with the results produced by the more detailed method presented in Table 7. However, the degree of accuracy in RSI values that is required In the calculation of heating loss Is far less than that required, for example, in the calculation of the energy savings attributable to an increase in RSI value, which was the original purpose of the previous Table 6 and the current Table 7.
5.2.2 Below-Grade Conductive Heat Loss
The calculation method and data in Clause 5.2.2 and Table 8 are based on “Simplified Method
for Calculation of Below-Grade Heat Loss from Small Residential Buildings”, Scanada
Consultants Limited for the Division of Building Research, National Research Council, March
1985. This study was in turn based on “Basement Heat Loss Studies at DBR/NRC, G.P. Mitalas,
DBR Paper No. 1045, September 1983.
The “Simplified Method” provides data and procedures for calculating below-grade heat loss rates and energy consumption on both a mean monthly and a total heating season basis. It allows for numerous configurations of insulation placement (exterior/interior, pan-height/full-height, etc), basement depth, and three soil thermal conductivity levels. In order to explore ways of further simplifying this method for this Standard, studies were undertaken to determine the sensitivity of final calculated heat loss rates to the following parameters:
(a) January vs February soil temperatures;
(b) soil conductivity;
(C) interior vs exterior placement of insulation;
(d) inclusion of all factors vs only the most significant ones;
(e) use of actual soil temperature variation for each location vs one value for all locations. The following calculation addresses the first three parameters. Results are based on a basement with floor slab 2.0 m below exterior grade:CSA F280-M90 pdf free download.
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