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Comparison of Outside Air and Sol-air Design Temperatures for Estimating Insulation Needs

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  10th International Livestock Environment Symposium (ILES X)  .(doi:10.13031/iles.18-138)
Authors:   Gary Daniel Chesser, Jr., Joseph L. Purswell, Jeremiah D. Davis, Jason K Ward, Thomas Tabler
Keywords:   Broiler house, design temperature, heat transfer, poultry, insulation, solar radiation, sol-air temperature, thermal envelope.

Abstract. Heat stress adversely affects poultry production and growth in hot weather. Poultry house insulation requirements are typically specified based on air temperatures alone, which disregards diurnal weather effects such as convective cooling and solar radiation. The objectives of this study were to: 1) Monitor internal and external temperatures of a commercial broiler house to verify the suitability of using sol-air temperature as a design parameter for broiler housing design; 2) Use the sol-air temperature to simulate the effects of solar radiation on conductive heat gain during warm weather for a modeled broiler house in varying climatic locations using historical meteorological data. Measurements of temperature (°C) (interior air, exterior air, and exterior surface) and solar radiation (W/m2) were recorded for an east facing sidewall of a broiler house. Sol-air temperatures were calculated from these data. Maximum daily air temperatures (Tair) were significantly different (P<0.0001) from maximum surface (Tsurface) and sol-air temperatures (Tsol-air). Maximum surface (Tsurface) and sol-air temperatures (Tsol-air) were not found to be significantly different (P=0.2144, P=0.1544). Additionally, simulations of conduction heat gains and losses by air (Tair) and sol-air (Tsol-air) temperatures were performed for a model control structure located in different climatic regions throughout the United States during daytime warm conditions using historical meteorological data. For each simulation, conductive heat gain as calculated by sol-air ΔT was considerably higher when compared to conductive heat gain calculated by air ΔT. This study supports the rationale that the sol-air temperature results in improved estimates of conductive heat transfer during daytime conditions.

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