Solar irradiation and coincident dry-bulb temperature selection for load calculations

Traditionally in the determination of heat loads in summer, internal solar heat gains are calculated using near-extreme solar irradiation data. The latter are typically from the ASHRAE Handbook - Fundamentals clear sky model in the fenestration chapter. Using these and other gains, the plant is then...

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Bibliographic Details
Published in:ASHRAE transactions 2006-01, Vol.112 (2), p.690-696
Main Authors: LEVERMORE, G. J, CHOW, D. H. C
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heating, air conditioning and ventilation
Solar radiation
Online Access:Get full text
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Summary:Traditionally in the determination of heat loads in summer, internal solar heat gains are calculated using near-extreme solar irradiation data. The latter are typically from the ASHRAE Handbook - Fundamentals clear sky model in the fenestration chapter. Using these and other gains, the plant is then sized based on the synoptic weather data (thy-bulb, wet-bulb, etc.) near-extreme values. These are based on the values in the ASHRAE Handbook - Fundamentals using 0.4%, 1.0%, and 2% exceeded values. Combining independent near-extreme values and modeled data can lead to more severe . design conditions than are likely in reality. A method of determining these solar and synoptic near-extreme values from measured values is proposed based on examination of the cumulative distribution functions. Examination shows the method to be robust and sensitive to changes in weather parameters. Such a method is also found to provide more realistic design conditions.
ISSN:0001-2505