Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Mark A. DietenbergerCharles R. Boardman
    Date: 2014
    Source: In: NATAS North American Thermal Analysis Society, September 14-17, 2014, Santa Fe, New Mexico Technical Program of the 42nd NORTH AMERICAN THERMAL ANALYSIS SOCIETY CONFERENCE, paper 135, 2014; 12 p.
    Publication Series: Full Proceedings
    Station: Forest Products Laboratory
    PDF: View PDF  (576.41 KB)

    Description

    Several years ago the Laplace transform solutions of Luikov’s differential equations were presented for one-dimensional heat and moisture transfer in porous hydroscopic orthotropic materials for the boundary condition of a gradual heat pulse applied to both surfaces of a flat slab. This paper presents calibration methods and data for the K-tester 637 (Lasercomp), allowing use of the mathematical solutions to measure material properties. The K-tester supplies a quasi-heat-pulse to both sides of a 2-ft-square specimen and records signals as function of time from surface thermocouples and thermopiles. Analysis methods are presented that apply to the thermal wave traveling through the FR4 thermopile, copper cladding, a sheet facing (aluminum or particle board), and the test specimen. A heavier, thicker, and expanded polystyrene (PS) foam board traceable to NIST was used as a “standard” specimen for calibrating thermal properties and temperature differential (from thermopile microvolts) for the FR4 thermopile via a specialized “forked” heat pulse profile. The similar heat pulse profile was then used to determine heat capacities and thermal conductivities of a very heavy and pure polystyrene board, Rexolite 1422, and a very light and thinner extruded PS foam board, in basic agreement with independent measurements. In addition, formulae are obtained for heat capacities and thermal conductivities of PS-based boards as functions of density, structure, and temperature. The stage is set for future work for determining heat and moisture transfer properties for a moist wood core between aluminum plate facings.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Dietenberger, Mark A.; Boardman, Charles R. 2014. Application of Quasi-Heat-Pulse Solutions for Luikov’s Equations of Heat and Moisture Transfer for Calibrating and Utilizing Thermal Properties Apparatus. In: NATAS North American Thermal Analysis Society, September 14-17, 2014, Santa Fe, New Mexico Technical Program of the 42nd NORTH AMERICAN THERMAL ANALYSIS SOCIETY CONFERENCE, paper 135, 2014; 12 p.

    Keywords

    Luikov equations solutions, heat/moisture transfer properties, foam core boards

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page