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Abstract
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 deviations indicating erratic performance in the roofing-insulation system and small departures indicting 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 percent or greater are possible because 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 effectiveness and thermal efficiency.
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 deviations indicating erratic performance in the roofing-insulation system and small departures indicting 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 percent or greater are possible because 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 effectiveness and thermal efficiency.
Date
4/1977
4/1977
Author(s)
D Schaefer; E T Larsen; H Aamot
D Schaefer; E T Larsen; H Aamot
Page(s)
40
40
Keyword(s)
cold regions; protected membrane roof; thermal insulation; heat loss; test methods; PMR; inverted membrane roof
cold regions; protected membrane roof; thermal insulation; heat loss; test methods; PMR; inverted membrane roof