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      OPTIMIZATION OF THE VENTILATION SYSTEM FOR A FORCED VENTILATION PIGGERY

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          Abstract

          Pigs are subjected to intensive environment control and management in order to achieve higher productivity. This is due to their sensitivity to climatic variation, which strongly affects their growth. This paper reports the design optimization of a forced ventilation piggery using computational fluid dynamics. This numerical investigation determined the effect of varying the number of ventilation openings and their location on the air flow pattern, speed, temperature, power needed, ability to remove heat and residence time. The effect of varying the ventilation rate in a range (0.05 – 0.8 m 3/s), and ambient temperatures of 5°C and 32°C was also investigated. The modeled piggery has dimensions 40 m × 15 m × 2.6 m, with central walkway and gable roof with the apex at 3.9 m and is a common design in Australia. A steady-state two-dimensional numerical model based on the integral volume method, including the effects of buoyancy and heat generated by the pigs, was solved using the computational fluid dynamics software “Fluent.” Four designs were investigated and an optimum design, which facilitates better ventilation of the majority of the room, has been identified. In summer, an inlet velocity has been recommended which achieves optimum environment inside the piggery meeting the pigs’ thermal comfort criteria with minimum power usage. During winter it became obvious that heating has to be used in all designs to be able to meet the pigs’ thermal comfort criteria.

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          Most cited references 26

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          Applications of computational fluid dynamics (CFD) in the modelling and design of ventilation systems in the agricultural industry: a review.

          The application of computational fluid dynamics (CFD) in the agricultural industry is becoming ever more important. Over the years, the versatility, accuracy and user-friendliness offered by CFD has led to its increased take-up by the agricultural engineering community. Now CFD is regularly employed to solve environmental problems of greenhouses and animal production facilities. However, due to a combination of increased computer efficacy and advanced numerical techniques, the realism of these simulations has only been enhanced in recent years. This study provides a state-of-the-art review of CFD, its current applications in the design of ventilation systems for agricultural production systems, and the outstanding challenging issues that confront CFD modellers. The current status of greenhouse CFD modelling was found to be at a higher standard than that of animal housing, owing to the incorporation of user-defined routines that simulate crop biological responses as a function of local environmental conditions. Nevertheless, the most recent animal housing simulations have addressed this issue and in turn have become more physically realistic.
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            A real-time computer vision assessment and control of thermal comfort for group-housed pigs

             Bin Shao,  Hongwei Xin (2008)
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              Prediction of room air motion by Reynolds-stress models

               Q. Chen (1996)
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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Fall 2009
                : 4
                : 4
                : 113-133
                Author notes

                1Corresponding author. Senior Lecturer, Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, QLD 4350, Australia. phone: (61) 7 4631 2615; fax: (61) 7 4631 2526; e-mail: mossad@ 123456usq.edu.au .

                Article
                jgb.4.4.113
                10.3992/jgb.4.4.113
                ©2009 by College Publishing. All rights reserved.

                Volumes 1-7 of JOGB are open access and do not require permission for use, though proper citation should be given. To view the licenses, visit https://creativecommons.org/licenses/by-nc/4.0/

                Page count
                Pages: 21
                Product
                Categories
                RESEARCH ARTICLES

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