![]() ![]() Table 402.1.2.1b-Parallel Path Correction Factors-Metal Framed Walls With Studs 16 Ga. (c ) For metal roof trusses or metal studs covered by Tables 402.1.2.1a and b, the total resistance of the series path shall be calculated in accordance with the following Equations: (b ) The zone method described in Chapter 22 of RS–4 (incorporated by reference, see § 434.701) and the formulas on page 22.10. (a ) Laboratory or field test measurements based on RS–5, RS–6, RS–7, or RS–8 (incorporated by reference, see § 434.701). ![]() ![]() The thermal transmittance of the envelope assembly containing metal framing shall be determined from one of three methods: The thermal performance of adjacent ground in below-grade applications shall be excluded from all thermal calculations.Ĥ02.1.2.1 Envelope Assemblies Containing Metal Framing. ![]() The thermal transmittance of opaque elements of assemblies shall be determined using a series path procedure with corrections for the presence of parallel paths within an element of the envelope assembly (such as wall cavities with parallel paths through insulation and studs). The thermal transmittance of each component of the building envelope shall be determined with due consideration of all major series and parallel heat flow paths through the elements of the component and film coefficients and shall account for any compression of insulation. U i = 1/R i (where R i is the total resistance to heat flow of an individual path through the building envelope)Ī i = the area of each individual element of the building envelope, ft 2 U i = the thermal transmittance of each individual path of the building envelope, i.e., the opaque portion or the fenestration, Btu/(h ☏)Ī o = the gross area of the building envelope, ft 2.U o = the area-weighted average thermal transmittance of the gross area of the building envelope i.e., the exterior wall assembly including fenestration and doors, the roof and ceiling assembly, and the floor assembly, Btu/(h The overall thermal transmittance of the building envelope shall be calculated in accordance with Equation 402.1.2: The shading coefficient used for louvered shade screens shall be determined using a profile angle of 30 degrees as found in Table 41, Chapter 27 of RS–4 (incorporated by reference, see § 434.701).Ĥ02.1.2 Thermal Performance Calculations. The shading coefficient of the fenestration, including both internal and external shading devices, is SC X and excludes the effect of external shading projections, which are calculated separately. When the information is not available from RS–4, (incorporated by reference, see § 434.701) the data shall be obtained from manufacturer's information or laboratory or field test measurements using RS–5, RS–6, RS–7, or RS–8 (incorporated by reference, see § 434.701).Ĥ02.1.1.1 The shading coefficient (SC) for fenestration shall be obtained from RS–4 (incorporated by reference, see § 434.701) or from manufacturer's test data. Information on thermal properties, building envelope system performance, and component heat transfer shall be obtained from RS–4. The building envelope and its associated assemblies and materials shall meet the provisions of this section.Ĥ02.1 Calculations and Supporting Information.Ĥ02.1.1 Material Properties. § 434.402 Building envelope assemblies and materials. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |