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Abstract
The paper investigates whether a comparative roof survey using aerial infrared thermography can be used to rank the roofs of residential and commercial bulidings according to their thermal resistance. Mathematical models arae presented for predicting the apparent radiance temperatues of these roof systems. These models are used to investigate the differences in apparent radiance temperature between roofs having various thermal resistances. These predicted differences are then compared with predicted differences in apparent radiance temperature caused by typical variations in roof emittanc, local outdoor temperature, and local wind speed throughout the macroclimate. The transmission characteristics of the atmosphere are reviewed, and the required dew point spread for preventing dew or frost formation on a roof is examined.
The paper investigates whether a comparative roof survey using aerial infrared thermography can be used to rank the roofs of residential and commercial bulidings according to their thermal resistance. Mathematical models arae presented for predicting the apparent radiance temperatues of these roof systems. These models are used to investigate the differences in apparent radiance temperature between roofs having various thermal resistances. These predicted differences are then compared with predicted differences in apparent radiance temperature caused by typical variations in roof emittanc, local outdoor temperature, and local wind speed throughout the macroclimate. The transmission characteristics of the atmosphere are reviewed, and the required dew point spread for preventing dew or frost formation on a roof is examined.
Date
8/1979
8/1979
Author(s)
Burch, D M
Burch, D M
Page(s)
38
38
Keyword(s)
aerial flyover; aerial infrared thermography; energy conservation roof heat loss survey
aerial flyover; aerial infrared thermography; energy conservation roof heat loss survey