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Blown cellulose fiber thermal insulations: pt. I: density of cellulose fiber thermal insulation in horizontal applications

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada
FormatText, Article
ConferenceSymposium, Thermal Transmission Measurements of Insulation, September 19, 1977, Philadelphia, Pennsylvania, United States
SubjectFibre; thermal insulation; thermal conductivity; thermal resistance; density (physics); settlement; thickness; cellulose fiber; density; settled density; residual density; moisture effects; blown insulation; blowing; pneumatic transport of insulation; paper
Abstract
Part 1: This paper presents results of a study with the following objectives: 1. Determine the effects of transport and placement conditions on the inital density of the insulation; 2) Establish a standardized method for producing specimens of blown cellulose fiber insulations; 3) Investigate the factors that cause the material to settle after placement; 4) Establish a standardized method to produce settlement in the specimens comparable with those found in field studies. A method recommended for producing settlement in the specimens consists of two procedures, one simulating settlement by impact produced on the standardized containers, and the other causing settlement under climatic cycling of the material. Part 2: The thermal resistance of a number of commercial blown loose-fill cellulose fiber thermal insulations has been measured using the guarded hot plate and heat flow meter methods. An equation describing the variation of thermal resistance with temperature, temperature difference, density, and thickness has been derived from these measurements and, with lesser precision, from the data provided by other investigators. The equation does not include the effects of chemical content, moisture content, chemical composition, or structure of the paper particles. The thermal resistance of a layer of insulation was found not to be directly proportional to thickness. The equation for thermal resistance fits the National Research Council of Canada (NRC) data with a standard deviation of less than 3.5 percent for thickness of 50 to 305 mm.
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In
  • ASTM Special Technical Publication (December 1978): 82–103.
LanguageEnglish
Peer reviewedYes
IdentifierDBR-P-820
NRC numberNRCC 17139
NRC-IRC-3018
NPARC number20375649
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Record identifier258f5994-0667-4214-b91a-8c15a0c9a6cc
Record created2012-07-23
Record modified2023-12-15
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