Call number:
ZSP-201-77/11
In:
CRREL Report, 77-11
Description / Table of Contents:
Two performance indicators, effectiveness and thermal efficiency, are defined and used to evaluate the year-round performance of three protected membrane roofs in Alaska and New Hampshire. Effectiveness is a measure of the deviations of ceiling temperatures from a yearly average, with large diviations indicating erratic performance in the roofing-insulation system and small departures indicating a thermally stable system. Thermal efficiency, the ratio of calculated heat loss to measured heat loss, is affected by climatic conditions such as rain, snow, solar radiation and wind. Thermal efficiency values of 100% or greater are possible since the calculated heat loss is based only on the inside and outside air temperature differences and the thermal properties of the roof components. Results of the year-round evaluation indicate that the three protected membrane roofs generally have high values of both effectiveness and thermal efficiency.
Type of Medium:
Series available for loan
Pages:
v, 40 Seiten
,
Illustrationen
Series Statement:
CRREL Report 77-11
URL:
https://hdl.handle.net/11681/9506
Language:
English
Note:
CONTENTS
Abstract
Preface
Conversion factors: U.S.customary to metric (SI) units of measurement
Introduction
Location of test sites
Fairbanks
Anchorage
Hanover, N.H.
Test program
Instrumentation
Effectiveness
Therma lefficiency
Heat balance within the roof
Comparisons with conventional systems
Conclusions
Effectiveness of the test roof
Thermal efficiency
Heat balance within the roof
Applicability
Recommendations
Literature cited
Appendix A. Temperature and heat flow measurements, Anchorage and Fairbanks, Alaska, and Hanover, New Hampshire
Appendix B. Thermal efficiencies of the test roof, Anchorage and Fairbanks, Alaska, and Hanover, New Hampshire
Appendix C. January 1973 and August 1972 comparisons of protected membrane and conventional built-up membrane systems at Hanover, New Hampshire
Location:
AWI Archive
Branch Library:
AWI Library
Permalink
