Hygroscopicity as a factor in the thermal conductivity of loose-fill insulators ...
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Hygroscopicity as a factor in the thermal conductivity of loose-fill insulators ... by Horace Ewing Ruff

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Published in [Ames, Ia .
Written in English

Subjects:

  • Insulation (Heat),
  • Thermal conductivity.

Book details:

Edition Notes

Other titlesLoose-fill insulators, Thermal conductivity of.
Statementby Horace Ewing Ruff, jr.
Classifications
LC ClassificationsTH1715 .R8 1938
The Physical Object
Paginationcover-title, p. 475-484.
Number of Pages484
ID Numbers
Open LibraryOL6390953M
LC Control Number39021819
OCLC/WorldCa32671583

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Hygroscopicity is a general term used to describe materials that readily take up water in a non-structured way. Thus, the adsorbed water is not structured within a crystal lattice and is reversible. The term hygroscopicity is not a quantitative definition and so should be qualified. Thermal conductivity plays a large part within the construction industry. Fire protection and resistance are two crucial components when constructing safe buildings. Protective intumescent coatings and fire resistant materials, such as concrete, can be used in the building process to increase safety. Thermal characterization: thermal conductivity and dynamic thermal performance Thermal conductivity (λ) and thermal diffusivity (α) were measured on the big samples with the electronic thermal analyser, QuicklineTM, based on the ASTM D standard, at room conditions. Three measurements were done for each sample.   Insulation materials can be made in different forms including loose-fill. Conductivity, Journal of Thermal Insulation and Building Envelopes, The Super Insulated Home Book.

Cellulose loose-fill material obtained from recycled paper is also studied as heat insulation material [12, 13], in wood frame wall structures registering low thermal conductivity coefficient. Learn how to use heat flux and thermal conductivity to calculate length of a rod with unknown length. Unburnable Paper. Make Paper flame-proof using only a metal rod. Heat Transfer of Liquids. Comparison of the Thermal Conductivity of various liquids using a simple set up.   Thermal Conductivity- K or λ -Ar. Abhinav Srivastav Thermal Insulation Thermal conductivity, often referred to as the 'K' or 'λ' (lambda) value, is a constant for any given material, and is measured in W/mK (watts per kelvin meter). The higher the λ value, the better the thermal conductivity. Good insulators will have as low a value as possible. Fifty-one papers (and three keynote addresses) on contemporary theoretical issues and experimental techniques pertaining to the underlying factors that control heat-conduction behavior of materials. The latest findings on insulation, fluids, and low-dimensional solids and composites are reviewed as5/5(1).

Figure exemplifies the temperature dependence of the thermal conductivity in a pure metallic element (Al), a concentrated alloy (steel), a pure insulator (MgO) and a strongly disordered insulator (glass). Pure metals and insulators have a maximum in the thermal conductivity, much below room temperature. With increasing lattice disorder of various kinds, this maximum decreases in height. Table Thermal conductivity of a number of common porous insulation materials (Peterson, ). Insulation material Thermal conductivity, λ [mW/(mK)] Mineral wool Expanded/extruded polystyrene Loose-fill cellulose fibre Foam glass Solid conduction. Thermal conductivity: heat is transferred from high to low temperature regions of the material. The same factors that affect the electrical conductivity (discussed in Chapter 18) also affect thermal conductivity In insulators and semiconductors the heat transfer is by phonons and, generally, is lower than in metals. It is. The effects of crystalline nature, impurities, lattice imperfections, grain boundaries, porosity, mixtures, and temperature on thermal conductivity are discussed. There are insufficient reliable data to assess quantitatively the effect of most of these factors at present, particularly for elevated temperatures.