Heat Transfer Versus Pitch Angle for Nonventilated, Triangular-Sectioned, Apex-Upward Air-Filled Spaces

TJ Thirst; SD Probert

doi:10.1520/STP35745S

SYMPOSIA PAPER Published: 01 January 1978

STP35745S

Heat Transfer Versus Pitch Angle for Nonventilated, Triangular-Sectioned, Apex-Upward Air-Filled Spaces

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The optimal pitch angle of a nonventilated triangular-sectioned air space, corresponding to a minimum heat transfer (Q) versus pitch angle (θ), was experimentally determined on a laboratory model to be 18 deg inclination for small values of temperature difference (ΔT) appropriate to those that would occur in roof spaces. In a more realistic roof cavity, this optimal pitch would be smaller; it is suggested that full-size nonventilated roofs be designed with pitches near 15 deg.

Author Information

Thirst, TJ

School of Mechanical Engineering, Cranfield Institute of Technology, Bedford, England

Probert, SD

School of Mechanical Engineering, Cranfield Institute of Technology, Bedford, England

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Details

Developed by Committee: C16

Pages: 203–210

DOI: 10.1520/STP35745S

ISBN-EB: 978-0-8031-4729-4

ISBN-13: 978-0-8031-0589-8

Heat Transfer Versus Pitch Angle for Nonventilated, Triangular-Sectioned, Apex-Upward Air-Filled Spaces

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