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The first method is the least accurate, according to ANSI/ASHRAE Standard 55, and the accuracy increases in order of the methods. [1] First, one can estimate the clothing insulation from the table provided in section five. If the clothing ensemble in question reasonably matches the clothing ensemble in the table, the indicated value can be used.
In addition to tables published by ASHRAE for select latitudes, a computer program called CLTDTAB, available since 1993, can be used to generate custom CLTD/CLF/SCL tables for a specific zone type for any latitude and month. This allows the use of this method, without interpolation, for any area in the world.
The U-value is used to refer to the amount of heat that can pass through a window, called thermal transmittance, with a lower score being better. [1] The U-factor of a window can often be found on the rating label of the window. Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units.
Shading coefficient (SC) is a measure of thermal performance of a glass unit (panel or window) in a building. It is the ratio of solar gain (due to direct sunlight) passing through a glass unit to the solar energy which passes through 3mm Clear Float Glass. [1]
Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units. In most countries, U-value is expressed in SI units, as watts per square metre-kelvin: W/(m 2 ⋅K) In the United States, U-value is expressed as British thermal units (Btu) per hour-square feet-degrees Fahrenheit: Btu/(h⋅ft 2 ⋅°F)
Members of ASHRAE receive the current volume, in both print and CD-ROM form, each year as a basic membership benefit. An enhanced electronic version, known as ASHRAE Handbook Online is a web-based version updated annually that contains the four latest volumes as well as extra content such as calculations, demonstration videos, and spreadsheets ...
It is acceptable to add or subtract garments on Table 2 from the ensembles in Table 1 to estimate the insulation of ensembles that differ in garment composition; It is possible to define a complete clothing ensemble as a combination of individual garments using Table 2. [1] Another unit that is used is the "tog": 1 tog = 0.1 K·m 2 ·W −1 ≈ ...
[4] The model code, IECC, and the standard, ASHRAE 90.1, apply to commercial buildings. [5] [4] [6] The IECC references several ASHRAE Standards, in particular, ASHRAE 90.1 for commercial building construction. [22] Being a part of the ICC’s collection of model codes, the IECC is revised annually and published in full-form every three years.