Numerical Simulation of the Placement of Exhaust Fans in a Tunnel-Ventilated Layer House During the Fall

IF 1.4 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
Xiaoshuai Wang, Jiangong Li, Jiegang Wu, Qianying Yi, Xin-lei Wang, Kaiying Wang
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引用次数: 2

Abstract

HighlightsThe placement and operation of exhaust fans was assessed using CFD simulation.The effective temperature was used to evaluate the indoor thermal environment.The placement and operation of the exhaust fans mainly affected the airflow patterns in the part of the layer house closest to the fans.Abstract. The thermal environment inside a layer house significantly affects the growth, production, and health of the hens. Tunnel ventilation systems have been widely applied to control the indoor climate and air quality for large-scale poultry facilities around the world. Generally, only a few of the exhaust fans operate during mild seasons (spring and fall) in a tunnel-ventilated layer house depending on the outside air temperature. The decision about which exhaust fans to turn on affects the indoor airflow pattern and temperature distribution. However, little research has been reported that investigated the effects of the locations of exhaust fans on ventilation performance. In this study, a computational fluid dynamics (CFD) model was built and validated using field-measured data. The CFD model was then used to evaluate different ventilation strategies (combinations of exhaust fans) in a typical tunnel-ventilated layer house during the fall. The effective temperature was used to assess the performance of different ventilation strategies. Results showed that the locations of the exhaust fans significantly affected the indoor thermal environment, especially in the part of the house closest to the fans, because different locations of operating fans can generate different airflow patterns and affect the airflow through the animal-occupied zone. Based on the simulations, we conclude that the placement and operation of the exhaust fans can be optimized. Turning on the fans that are lower to the ground or near the sidewalls will result in more air bypassing the animal-occupied zones. Our results can help select the best ventilation strategy during the spring and fall in layer houses with tunnel ventilation systems. Keywords: Airflow distribution, Effective temperature distribution, Indoor thermal environments, Ventilation strategy.
隧道通风层屋秋季排风机布置的数值模拟
利用CFD模拟对排气扇的布置和运行进行了评估。采用有效温度对室内热环境进行评价。排风机的布置和运行主要影响层屋最靠近排风机部分的气流形态。鸡舍内的热环境对蛋鸡的生长、生产和健康有显著影响。隧道通风系统已广泛应用于全球大型家禽养殖场的室内气候和空气质量控制。一般来说,在温和的季节(春季和秋季),在隧道通风层房屋中,根据外部空气温度,只有少数排风机运行。打开哪个排风机的决定会影响室内的气流模式和温度分布。然而,很少有研究报道调查了排风机的位置对通风性能的影响。在本研究中,建立了计算流体动力学(CFD)模型,并使用现场实测数据进行了验证。然后使用CFD模型评估了典型隧道通风层屋在秋季的不同通风策略(排风机组合)。利用有效温度来评价不同通风策略的效果。结果表明,排风机的位置对室内热环境有显著影响,特别是在离排风机最近的房屋部分,因为不同的排风机位置会产生不同的气流模式,从而影响通过动物占用区的气流。仿真结果表明,排气扇的布置和运行是可以优化的。打开离地面较低或靠近侧壁的风扇将导致更多的空气绕过动物占据的区域。我们的研究结果可以帮助采用隧道通风系统的多层房屋选择春季和秋季的最佳通风策略。关键词:气流分布,有效温度分布,室内热环境,通风策略
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来源期刊
Transactions of the ASABE
Transactions of the ASABE AGRICULTURAL ENGINEERING-
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.
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