Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Standard

Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics. / Zhou, Bo; Wang, Xiaoshuai; Mondaca, Mario R.; Rong, Li; Choi, Christopher Y.

I: Computers and Electronics in Agriculture, Bind 165, 104930, 10.2019.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

APA

CBE

MLA

Vancouver

Author

Zhou, Bo ; Wang, Xiaoshuai ; Mondaca, Mario R. ; Rong, Li ; Choi, Christopher Y. / Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics. I: Computers and Electronics in Agriculture. 2019 ; Bind 165.

Bibtex

@article{bbee10ef37704f08a31ee275252e338e,
title = "Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics",
abstract = "Baffles are often installed in mechanically cross-ventilated barns to combat heat stress by enhancing the cooling effect produced by the barn's design. How effectively these baffles operate during warm weather often depends on where each baffle is located and at what angle it is set. Currently, their location and orientation are determined primarily according to the personal experience of the contractor in charge of installing the barn's ventilation system. This study seeks to quantify the extent to which the location and orientation may affect the efficiency of the installed baffles. Computational fluid dynamics was used to create a three-dimensional model of a typical low-profile, cross-ventilated dairy barn. Differences were evaluated using both heat transfer and heat stress index (the Equivalent Temperature Index for Cattle - EITC). The results obtained from the tested scenarios indicated that installing the baffles above the animal occupied zone (AOZ) could indeed increase the air velocity (from less than 0.5 m s−1 to around 3 m s−1 once baffles were in place), and could also greatly increase (by 21.1%–50.9%) the amount of heat removed, while reducing the EITC by ~6 °C. In comparisons between the most commonly used scenario (in which baffles were installed vertically in the middle of the AOZ), and the other with-baffle-scenarios, the rate at which heat was removed from the cows varied by −3.0% to 2.6%, with the maximum difference being 172.4W. However, these scenario produced no significant improvement comparing with the commonly used one. The results obtained should provide a more reliable reference for engineers engaged in designing large-scale dairy barns.",
keywords = "Animal occupied zone, Baffle placement, Cross-ventilated barn, Heat and mass transfer, Numerical simulation",
author = "Bo Zhou and Xiaoshuai Wang and Mondaca, {Mario R.} and Li Rong and Choi, {Christopher Y.}",
year = "2019",
month = oct,
doi = "10.1016/j.compag.2019.104930",
language = "English",
volume = "165",
journal = "Computers and Electronics in Agriculture",
issn = "0168-1699",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Assessment of optimal airflow baffle locations and angles in mechanically-ventilated dairy houses using computational fluid dynamics

AU - Zhou, Bo

AU - Wang, Xiaoshuai

AU - Mondaca, Mario R.

AU - Rong, Li

AU - Choi, Christopher Y.

PY - 2019/10

Y1 - 2019/10

N2 - Baffles are often installed in mechanically cross-ventilated barns to combat heat stress by enhancing the cooling effect produced by the barn's design. How effectively these baffles operate during warm weather often depends on where each baffle is located and at what angle it is set. Currently, their location and orientation are determined primarily according to the personal experience of the contractor in charge of installing the barn's ventilation system. This study seeks to quantify the extent to which the location and orientation may affect the efficiency of the installed baffles. Computational fluid dynamics was used to create a three-dimensional model of a typical low-profile, cross-ventilated dairy barn. Differences were evaluated using both heat transfer and heat stress index (the Equivalent Temperature Index for Cattle - EITC). The results obtained from the tested scenarios indicated that installing the baffles above the animal occupied zone (AOZ) could indeed increase the air velocity (from less than 0.5 m s−1 to around 3 m s−1 once baffles were in place), and could also greatly increase (by 21.1%–50.9%) the amount of heat removed, while reducing the EITC by ~6 °C. In comparisons between the most commonly used scenario (in which baffles were installed vertically in the middle of the AOZ), and the other with-baffle-scenarios, the rate at which heat was removed from the cows varied by −3.0% to 2.6%, with the maximum difference being 172.4W. However, these scenario produced no significant improvement comparing with the commonly used one. The results obtained should provide a more reliable reference for engineers engaged in designing large-scale dairy barns.

AB - Baffles are often installed in mechanically cross-ventilated barns to combat heat stress by enhancing the cooling effect produced by the barn's design. How effectively these baffles operate during warm weather often depends on where each baffle is located and at what angle it is set. Currently, their location and orientation are determined primarily according to the personal experience of the contractor in charge of installing the barn's ventilation system. This study seeks to quantify the extent to which the location and orientation may affect the efficiency of the installed baffles. Computational fluid dynamics was used to create a three-dimensional model of a typical low-profile, cross-ventilated dairy barn. Differences were evaluated using both heat transfer and heat stress index (the Equivalent Temperature Index for Cattle - EITC). The results obtained from the tested scenarios indicated that installing the baffles above the animal occupied zone (AOZ) could indeed increase the air velocity (from less than 0.5 m s−1 to around 3 m s−1 once baffles were in place), and could also greatly increase (by 21.1%–50.9%) the amount of heat removed, while reducing the EITC by ~6 °C. In comparisons between the most commonly used scenario (in which baffles were installed vertically in the middle of the AOZ), and the other with-baffle-scenarios, the rate at which heat was removed from the cows varied by −3.0% to 2.6%, with the maximum difference being 172.4W. However, these scenario produced no significant improvement comparing with the commonly used one. The results obtained should provide a more reliable reference for engineers engaged in designing large-scale dairy barns.

KW - Animal occupied zone

KW - Baffle placement

KW - Cross-ventilated barn

KW - Heat and mass transfer

KW - Numerical simulation

UR - http://www.scopus.com/inward/record.url?scp=85070615025&partnerID=8YFLogxK

U2 - 10.1016/j.compag.2019.104930

DO - 10.1016/j.compag.2019.104930

M3 - Journal article

AN - SCOPUS:85070615025

VL - 165

JO - Computers and Electronics in Agriculture

JF - Computers and Electronics in Agriculture

SN - 0168-1699

M1 - 104930

ER -