tailieunhanh - 2001 Fundamentals Part 9

Tham khảo tài liệu '2001 fundamentals part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 25 THERMAL AND WATER VAPOR TRANSMISSION DATA Building Envelopes. Calculating Overall Thermal Resistances . Mechanical and Industrial Systems . Calculating Heat Flow for Buried Pipelines . This chapter presents thermal and water vapor transmission data based on steady-state or equilibrium conditions . Chapter 3 covers heat transfer under transient or changing temperature conditions Chapter 23 discusses selection of insulation materials and procedures for determining overall thermal resistances by simplified methods BUILDING ENVELOPES Thermal Transmission Data for Building Components The steady-state thermal resistances R-values of building components walls floors windows roof systems etc can be calculated from the thermal properties of the materials in the component or the heat flow through the assembled component can be measured directly with laboratory equipment such as the guarded hot box ASTM Standard C 236 or the calibrated hot box ASTM Standard C 976 . Tables 1 through 6 list thermal values which may be used to calculate thermal resistances of building walls floors and ceilings The values shown in these tables were developed under ideal conditions . In practice overall thermal performance can be reduced significantly by such factors as improper installation and shrinkage settling or compression of the insulation Tye and Desjarlais 1983 Tye 1985 1986 . Most values in these tables were obtained by accepted ASTM test methods described in ASTM Standards C 177 and C 518 for materials and ASTM Standards C 236 and C 976 for building envelope components Because commercially available materials vary not all values apply to specific products The most accurate method of determining the overall thermal resistance for a combination of building materials assembled as a building envelope component is to test a representative sample by a hot box method . However all combinations may not be conveniently or economically tested in this manner. For .

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