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<p>In the pig houses with mist cooling systems, the layout design of airflow and spray is the important factor affecting the cooling effect of pigs. However, there is currently insufficient understanding of heat and mass transfer characteristics of pig-water-wet air (PWWA) under different design parameters. In order to guide the structural design of systems, the heat and mass transfer characteristics are analyzed for PWWA in a developed model based on heat–mass transfer theory and multi-model coupling method. The model is validated based on experimental data from literature. The results show that the maximum uncertainty between simulation and literature data is 9.1&#xa0;%. Meanwhile, the influences of different design parameters are analyzed for the heat and mass transfer characteristics of PWWA. It can be found that when the spray height is 800–1200 mm and the spray angle is 40–80°, compared with other three nozzle shapes, the cooling performance between pigs and spray water can be improved when using solid-shaped nozzles. Further, this effect can be strengthened at lower spray heights. Through scheme comparison, the optimal structural design scheme is obtained for the mist cooling system. It is recommended to use a design scheme with s-shaped nozzles, a spray angle of 20° and a spray height of 700 mm. This is because compared with other schemes designed to obtain the optimal heat transfer rate and unit length pressure drop, the disturbance can be significantly increased for wet air around pigs and the mass transfer rate is not significantly changed for water-wet air under the recommended scheme. Although compared with the scheme designed to obtain optimal mass transfer rate, the mass transfer coefficient between spray water and wet air under the recommended scheme decreases by about 10&#xa0;%, its heat transfer coefficient and unit length pressure drop increase by at most 42.7&#xa0;% and 13.4&#xa0;%, respectively. This study can provide a forward-looking theoretical guidance for the pre-design and application evaluation of mist cooling systems in pig houses.</p>

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Numerical Study on the Heat and Mass Transfer Characteristics of Pig-Water-Wet Air in Pig Houses

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Yue Xie,
  • Hongqiang Ma,
  • Wenbin Zhuang,
  • Jiajun Wang

摘要

In the pig houses with mist cooling systems, the layout design of airflow and spray is the important factor affecting the cooling effect of pigs. However, there is currently insufficient understanding of heat and mass transfer characteristics of pig-water-wet air (PWWA) under different design parameters. In order to guide the structural design of systems, the heat and mass transfer characteristics are analyzed for PWWA in a developed model based on heat–mass transfer theory and multi-model coupling method. The model is validated based on experimental data from literature. The results show that the maximum uncertainty between simulation and literature data is 9.1 %. Meanwhile, the influences of different design parameters are analyzed for the heat and mass transfer characteristics of PWWA. It can be found that when the spray height is 800–1200 mm and the spray angle is 40–80°, compared with other three nozzle shapes, the cooling performance between pigs and spray water can be improved when using solid-shaped nozzles. Further, this effect can be strengthened at lower spray heights. Through scheme comparison, the optimal structural design scheme is obtained for the mist cooling system. It is recommended to use a design scheme with s-shaped nozzles, a spray angle of 20° and a spray height of 700 mm. This is because compared with other schemes designed to obtain the optimal heat transfer rate and unit length pressure drop, the disturbance can be significantly increased for wet air around pigs and the mass transfer rate is not significantly changed for water-wet air under the recommended scheme. Although compared with the scheme designed to obtain optimal mass transfer rate, the mass transfer coefficient between spray water and wet air under the recommended scheme decreases by about 10 %, its heat transfer coefficient and unit length pressure drop increase by at most 42.7 % and 13.4 %, respectively. This study can provide a forward-looking theoretical guidance for the pre-design and application evaluation of mist cooling systems in pig houses.