A building thermal model was used to compute hourly values of temperature humidity index (THI) for a broiler house with and without an evaporative misting system. Hourly summer time weather data for 238 U.S.A. locations covering 30 years were used to develop extreme occurrences of THI. Results were incorporated into a Geographical Information System (GIS) database to create isolines of THI and percentage of hours exceeding a heat stress threshold. Regional variations in misting as a suitable cooling technique are presented in terms of hours reduction in annual heat stress. The technique may be used for assisting in management decisions regarding poultry facilities housing design and siting, and with appropriate THI may be extended to other livestock production.

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Published in Transactions of the ASAE, v. 38, issue 1, p. 197-205.

© 1995 American Society of Agricultural Engineers

The copyright holder has granted the permission for posting the article here.

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Funding Information

Acquisition of the SAMSON weather data was funded by ASHRAE grant 754-RP "Design Data for the 1, 2 1/2, and 5% occurrences of Extreme Dew-Point Temperature, With Mean Coincident Dry-Bulb Temperature".