Thermal Resistance and Aging of Rigid Urethane Foam Insulation

JA Valenzuela; LR Glicksman

doi:10.1520/STP29480S

SYMPOSIA PAPER Published: 01 January 1983

STP29480S

Thermal Resistance and Aging of Rigid Urethane Foam Insulation

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Relevant data and analyses for aging and effective thermal conductance of rigid urethane and isocyanurate foam are reviewed. Simplified theoretical models are formulated that indicate the order of magnitude and limiting bounds for exact results. Existing heat transfer models underpredict the measured thermal conductance by 25 percent. The discrepancy is most probably caused by thermal radiation transmission through cell walls. Effective diffusion coefficients reported in the literature for different foam samples vary by an order of magnitude. The differences are caused by variations in cell geometry and cell wall permeability.

Author Information

Valenzuela, JA

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass

Glicksman, LR

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass

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Developed by Committee: C16

Pages: 688–702

DOI: 10.1520/STP29480S

ISBN-EB: 978-0-8031-4856-7

ISBN-13: 978-0-8031-0230-9

Thermal Resistance and Aging of Rigid Urethane Foam Insulation

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