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Abstract
The concept of the thermal efficiency of a roof is described as a measure to evaluate the thermal performance of a roof. A protected membrane test rof, on which temperature and heat flow measurements were made over a one-year period, is described together with the relevant measurements program. Evaluations of three different months show results of cold, hot and intermediate climatic conditions. The influence of sunshine, rain, wind and snow on the thermal efficiency is analyzed and compared with observed results. Generally, sunshine as well as snow on the roof increase the efficiency while rain reduces it. The influence of wind, while important to the surface heat exchange, is small as far as the efficiency is concerned. The value of the thermal efficiency concept is in the means it offers for comparison of different designs and different climates because each roof has its own particular efficiency. Computer modelling permits design analysis and optimization during the planning stage of a construction project and the development of general design criteria for efficient roofs.
The concept of the thermal efficiency of a roof is described as a measure to evaluate the thermal performance of a roof. A protected membrane test rof, on which temperature and heat flow measurements were made over a one-year period, is described together with the relevant measurements program. Evaluations of three different months show results of cold, hot and intermediate climatic conditions. The influence of sunshine, rain, wind and snow on the thermal efficiency is analyzed and compared with observed results. Generally, sunshine as well as snow on the roof increase the efficiency while rain reduces it. The influence of wind, while important to the surface heat exchange, is small as far as the efficiency is concerned. The value of the thermal efficiency concept is in the means it offers for comparison of different designs and different climates because each roof has its own particular efficiency. Computer modelling permits design analysis and optimization during the planning stage of a construction project and the development of general design criteria for efficient roofs.
Date
9/1974
9/1974
Author(s)
Aamot, H
Aamot, H
Page(s)
Paper 14
Paper 14
Source
Society of Chemical Industry
Society of Chemical Industry
Keyword(s)
thermal efficiency; thermal performance; protected membrane roof; PMR; inverted membrane; IMR
thermal efficiency; thermal performance; protected membrane roof; PMR; inverted membrane; IMR