Computational fluid dynamics evaluation of pig house ventilation systems for improving the internal rearing environment

Yeo, Uk-Hyeon; Lee, In-Bok; Kim, Rack-woo; Lee, Sang Yeon; Kim, Jun-Gyu

doi:10.1016/j.biosystemseng.2019.08.007

Cited by 45 publications

(30 citation statements)

References 42 publications

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“…However, feasibility is considered more difficult (μ = 3.25 and μ = 3.24). Since an optimal climate is a basic requirement for the health of pigs, special ventilation systems have long been used to ensure good air circulation in pigsties (Yeo et al 2019;Wenke et al 2018). Furthermore, different functional areas have already been added in many pigsties (Feller 2019).…”

Section: Discussionmentioning

confidence: 99%

Importance and Feasibility of Animal Welfare Measures from a Consumer Perspective in Germany

2020

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The subject animal welfare is increasingly in the public discourse. Consumers and policymakers are increasingly demanding products that are produced under increased animal welfare standards. The profession of the farmer involuntarily gets into disrepute. Many consumers want fundamental changes in pig farming, but are not aware of the consequences of implementation. In this representative study, consumers (n = 1101) were asked about their assessment of 33 animal welfare measures with regard to their importance and the feasibility of implementing those measures. With the help of a four-field matrix, both the perceived importance and the feasibility of the animal welfare measures surveyed were brought together. The results show four possibilities: important and easy to implement, important and not feasible, not important and easy to implement as well as not important and not feasible. The results show that any outdoor access to pasture ranks first, followed by any outdoor access to straw bedding. The results can make a significant contribution to future communication with critical consumers concerning the implementation of higher animal welfare levels, as it becomes clearer how realistic consumers are about the feasibility of several animal welfare measures. Furthermore, the results could prove useful for the design of animal welfare programs and could help famers making targeted decisions concerning stable construction and management.

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Section: Discussionmentioning

confidence: 99%

Importance and Feasibility of Animal Welfare Measures from a Consumer Perspective in Germany

2020

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“…Furthermore, given that the difference in the number of grid cells between the medium and fine grids is also large, the spacing of the grid conditions needs to be narrowed. Consequently, many researchers are performing random sampling methods that further subdivide the grid conditions [18][19][20][21][22]. Meanwhile, the random sampling method has the limitation of depending on the researcher's knowledge and experience because there are no criteria applicable for the selection of the test target grid conditions.…”

Section: Literature Reviewmentioning

confidence: 99%

Improvement of Grid Independence Test for Computational Fluid Dynamics Model of Building Based on Grid Resolution

Lee

Park

et al. 2020

Advances in Civil Engineering

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Computational fluid dynamics (CFD) is being used in various research fields on the building environment. Target space of the CFD model is divided into a finite number of grids for numerical analysis. Therefore, an optimal grid design is required to obtain accurate results. The grid independence test is generally performed to design an optimal grid. However, given that there is no standardized procedure for gird independence test, most depend on the researcher’s experience and knowledge. In the conventional method, the subjective judgment of the researcher affected the selection of the grid conditions and the criteria for the optimal grid. It can lead to a decrease in the reliability of the simulation results by poor grid design. This study proposed a grid independence test method that applies the grid resolution to improve the conventional method. The grid resolution was calculated by applying the characteristic length. CV(RMSE) and R2 were applied as the criteria for optimal grid. A case study was conducted to evaluate the adequacy of the proposed method. As the characteristic length increased, the optimal grid resolution increased. In particular, for a characteristic length of 0.7 or more, the optimal grid resolution was evaluated as 24. The grid convergence index (GCI) was calculated to verify the suitability of the proposed method. As a result, all of the optimal grid resolution derived from the proposed method was evaluated as the optimal condition.

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“…In these systems, the accurate control of the indoor conditions is not always feasible, especially on warm days, when the windows and vents of the barns are fully open [ 8 ]. In mechanically ventilated barns, the ventilation efficiency can vary depending on the operational conditions of the ventilation system [ 9 ]. In both natural and mechanical ventilation systems, the ventilation efficiency can vary depending on the geometry of the piggery structure; therefore, it should be carefully evaluated.…”

Section: Introductionmentioning

confidence: 99%

“…Inadequate ventilation, leading to subsequent changes in temperature, humidity, and presence of gas and dust [ 10 , 11 , 12 ], has been found linked to pig behavior, health, and physiology [ 9 ]. For some ABMs, the effects of poor ventilation on animal health are well known; for example, an insufficient air exchange can increase the occurrence of respiratory disease and thermal stress [ 7 , 13 ], while contrasting results have been observed with regard to animal behavior.…”

Section: Introductionmentioning

confidence: 99%

Behavior and Welfare of Undocked Heavy Pigs Raised in Buildings with Different Ventilation Systems

Vitali

Santolini

Bovo

et al. 2021

Animals

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The present study aimed to evaluate animal welfare of pigs from the same farm, raised with two ventilation systems. The study involved 60 pens of fattening pigs, raised in two buildings: one naturally ventilated (NV) and the other mechanically ventilated (MV). Pigs were assessed on three observation days: at 40 kg (T1), 100 kg (T2), and 160 kg (T3) of live weight. Animal-based measures were used such as qualitative behavioral analysis (QBA), behavioral measures (BMs), and lesion and health measures (LHMs). Housing conditions (HCs) measured at each observation day were the number of pigs per pen, space allowance, temperature, light, and CO2. The association study was performed using a general linear model and analysis of variance. Ventilation effect was analyzed by performing computational fluid dynamics. Results showed that overall pigs raised in the MV were in a more positive affective state. Despite that, with hot temperatures, the higher occurrence of pig soiling indicated heat stress in pigs and consequent welfare impairment. The higher frequency of pigs showing dog sitting behavior at T2 and T3 suggest welfare worsening in the last phases of fattening. The study concludes that ventilation system influences animal behavior and overall animal welfare, especially during the warmer season.

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Computational fluid dynamics evaluation of pig house ventilation systems for improving the internal rearing environment

Cited by 45 publications

References 42 publications

Importance and Feasibility of Animal Welfare Measures from a Consumer Perspective in Germany

Importance and Feasibility of Animal Welfare Measures from a Consumer Perspective in Germany

Improvement of Grid Independence Test for Computational Fluid Dynamics Model of Building Based on Grid Resolution

Behavior and Welfare of Undocked Heavy Pigs Raised in Buildings with Different Ventilation Systems

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