Influence of Air Inlet Height and Angle on Air Age and CO2 Distribution in Pig House

被引：0
|
作者：
Cao M. [1 ,2 ]
Yang T. [1 ,2 ]
Zong C. [1 ,2 ]
Teng G. [1 ,2 ]
Zhuang Y. [1 ,2 ]
Zhou S. [1 ,2 ]
机构：
[1] College of Water Resources and Civil Engineering, China Agricultural University, Beijing
[2] Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2020年 / 51卷
关键词：
Air age; CO[!sub]2[!/sub] distribution; Convective heat transfer; Pig house; Ventilation inlet; Wind speed pattern;
D O I：
10.6041/j.issn.1000-1298.2020.S2.052
中图分类号：
学科分类号：
摘要：
In order to study the influence of air inlet type on air age and CO2 of pig house, computational fluid dynamics (CFD) technology was used to simulate the wind speed, air age, CO2 and the convective heat transfer of pigs in an experimental pig house. The angle of the air inlet deflector of the original model (scheme A) was 50°, and the inlet height was 1.8 m. At the same time, totally six additional inlet conditions were selected to simulate and compare the pig house with the original pig house. Scheme B: the angle of the air inlet deflector was 90°, and the inlet height was 1.8 m; scheme C: the air inlet deflector angle was 120°, and the inlet height was 1.8 m; scheme D: the air inlet deflector angle was 150°, and the inlet height was 1.8 m; scheme E: the air inlet deflector angle was 50°, and the inlet height was 1.6 m; scheme F: the air inlet deflector angle was 50°, and the inlet height was 1.4 m; scheme G: the air inlet deflector angle was 50°, and the inlet height was 1.2 m. The results showed that the correlation R2 between the simulated and the measured wind speed value was 0.916 2, and the average relative error was 26.7%. This model can accurately predict the airflow pattern in the pig house. Through the comparison of the simulation results of different air inlet deflectors, the scheme C and scheme F can significantly reduce the average air age and average CO2 concentration of pigs in the house, and maintain the heat preservation effect of the pig house. Comparing various air intake schemes, it can be found that the CO2 concentration in the animal occupied zone (AOZ) was not only affected by the average air age in the zone around the pigs, but also by the uniformity of the air age distribution throughout the entire pig house. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
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页码：427 / 434and441
相关论文
共 25 条
  • [1] CHENG Qiongyi, The CFD simulation and improvements of ventilation in stacked-cage laying hen housing, (2018)
  • [2] ZHOU B, WANG X S, MONDACA M R, Et al., Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics, Computers and Electronics in Agriculture, 165, (2019)
  • [3] (2011)
  • [4] 1, pp. 92-94
  • [5] GUARDIA O M., Emissions of NH<sub>3</sub>, H<sub>2</sub>S and CO<sub>2</sub> from swine slurry as affected by surface liquid disturbance, (2010)
  • [6] BLANE-VIDAL V, NADIMI E S., The dynamics of ammonia release from animal wastewater as influenced by the release of dissolved carbon dioxide and gas bubble, Atmospheric Environment, 45, 29, pp. 5110-5118, (2011)
  • [7] NI J Q, HENDRIKS J, VINCKIER C, Et al., A new concept of carbon dioxide accelerated ammonia release from liquid manure in pig house, Environment International, 26, 1-2, pp. 97-104, (2000)
  • [8] 16
  • [9] BIANCA W., The signifiance of meterology in animal production, International Journal of Biometeorology, 20, 2, pp. 139-156, (1976)
  • [10] BRUCE J M, CLARK J J., Models of heat production and critical temperature for growing pigs, Animal Production Science, 28, pp. 353-369, (1979)
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