CFD Study of a Tunnel-Ventilated Compost-Bedded Pack Barn Integrating an Evaporative Pad Cooling System

被引:4
作者
Obando Vega, Felipe Andres [1 ]
Montoya Rios, Ana Paola [1 ]
Osorio Saraz, Jairo Alexander [1 ]
Andrade, Rafaella Resende [2 ]
Damasceno, Flavio Alves [3 ]
Barbari, Matteo [4 ]
机构
[1] Univ Nacl Colombia, Fac Ciencias Agr, Carrera 65 59A-110, Medellin 050034, Colombia
[2] Univ Fed Vicosa, Dept Agr Engn, Av Peter Henry Rolfs,Univ Campus Vicosa, BR-36570900 Vicosa, MG, Brazil
[3] Univ Fed Lavras, Dept Engn, Rua Prof Edmir Sa Santos,Univ Campus, BR-37200900 Lavras, Brazil
[4] Univ Florence, Dept Agr Food Environm & Forestry DAGRI, Ple Cascine 18, I-50144 Florence, Italy
来源
ANIMALS | 2022年 / 12卷 / 14期
关键词
compost-bedded pack barn; tunnel-ventilated; animal welfare; thermal comfort; dairy cattle; ETIC; CFD; evaporative cooling; COMPUTATIONAL FLUID-DYNAMICS; DAIRY-CATTLE; BODY-TEMPERATURE; HEAT-STRESS; PERFORMANCE; MODEL; MILK; COWS; VALIDATION; SOUTHEAST;
D O I
10.3390/ani12141776
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Evaporative cooling is one of the most efficient techniques to reduce heat stress in cows in agricultural facilities. Additionally, compost-bedded pack barn has been shown to improve the welfare and production of cows. Two techniques were combined and analysed by developing a computational fluid dynamics (CFD) model of a tunnel-ventilated compost-bedded packed barn that integrated the heat and airflow dynamics of an evaporative pad cooling system. This allowed us to study the distribution of dry-bulb temperature, relative humidity and airflow velocity inside the barn based on the external environmental conditions, thickness of the pad, water temperature and specific manufacturer characteristics of the pad, providing optimal cooling pad location, size and operating conditions in the barn. Employing experimental data the CFD model was validated showing good agreement. The Equivalent Temperature Index for dairy Cattle (ETIC) was used to determine the level of stress of the cows considering the airflow velocity. It was found a moderate stress due to high relative humidity and low airflow velocity. From the predicted results, it was recommended to increase the airflow velocity above 3 m s(-1) when simultaneously the external dry-bulb temperature and relative humidity exceed 30 degrees C and 55%, respectively, simultaneously. Additionally, installation of baffles at the pad outlet to drive the airflow to the floor was suggested to improve the drying of the compost-bedded closed to the pads, where a low airflow velocity region was established.
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页数:21
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