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Optimizing the Pad Cooling Ventilation System of Laying Hen Barn Using CFD in Southeast China

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

Citation:  Paper number  131620039,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Xiaoshuai Wang, Kaiying Wang
Keywords:   evaluation improved design CFD model wet pad cooling system laying hen house.

Abstract. Microenvironment around hens is critical to their performance and health during hot and humid summer. To provide a good environment condition, mechanical tunnel ventilation with evaporative cooling systems is applied for poultry houses cooling in most regions of China in summertime. In order to investigate the efficiency of current ventilation scheme, Computational Fluid Dynamics (CFD) simulationwas used which can lower the cost of frequent measurements and overcome the limited number of sampling points. In this study, a field experiment was conducted in a typical laying hen barn located in the southeast of China. It included 16 positions of velocity and temperature inside and one position outside the barn. The monitoring data were used to validate the accuracy of CFD simulation.

The simulation results for the velocity and temperature were in agreement with observed data. Heterogeneity of velocity and temperature, increasing of the humidity in high rise barn which this ventilation scheme brought were observed. Two optimization designs of ventilation and cooling system for the house were generated and simulated by CFD. When compared two upgraded cases with original house, the results showed improved case 1 was best in velocity uniformity, the temperature homogeneity in improved case 2 was outstanding, because of the younger age of air. Coupled temperature and velocity, improved case 2 is the best one, for it can provide a more comfortable microenvironment for layers. CFD simulations, when supported by experimental research, can make a great contribution to the design of ventilation system in commercial poultry houses.

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