Temperature distribution in a finisher pig building with hybrid ventilation
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Temperature distribution in a finisher pig building with hybrid ventilation. / Gautam, Khem R.; Rong, Li; Zhang, Guoqiang; Bjerg, Bjarne S.
I: Biosystems Engineering, Bind 200, 2020, s. 123-137.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Temperature distribution in a finisher pig building with hybrid ventilation
AU - Gautam, Khem R.
AU - Rong, Li
AU - Zhang, Guoqiang
AU - Bjerg, Bjarne S.
PY - 2020
Y1 - 2020
N2 - The differences between temperatures in the animal occupied zone (AOZ) and temperatures measured by control system sensors are rarely explored. This experimental study quantifies the dry-bulb air temperature [hereinafter temperature] distribution inside a finisher pig building that combines natural ventilation through automatically controlled openings with a mechanical ventilation system. Year-long temperature data from 28 sensors located at 3 different heights in the building was analysed to help understand the temperature distributions and indicate the temperatures below or above an assumed optimal temperature range, defined as between 14 °C and 24 °C. Relatively large variations in the spatial temperature distribution were found, and they were higher in the vertical direction than in the longitudinal direction. The temperatures measured in the AOZ at 0.25 m height, were on average, 7 °C warmer than that at 1.5 m height. The AOZ temperature correlated better with temperatures measured at 0.7 m or 1.5 m height in the same pen than with temperatures measured in the AOZ at other pens. The analyses show that a proportional–integral based control system effectively counteracts the effects of outdoor wind conditions, and the control system is capable of maintaining the defined optimal temperature at the measurement height. However, the optimum temperatures at the measurement heights above AOZ do not correspond to the measured temperatures in the AOZ.
AB - The differences between temperatures in the animal occupied zone (AOZ) and temperatures measured by control system sensors are rarely explored. This experimental study quantifies the dry-bulb air temperature [hereinafter temperature] distribution inside a finisher pig building that combines natural ventilation through automatically controlled openings with a mechanical ventilation system. Year-long temperature data from 28 sensors located at 3 different heights in the building was analysed to help understand the temperature distributions and indicate the temperatures below or above an assumed optimal temperature range, defined as between 14 °C and 24 °C. Relatively large variations in the spatial temperature distribution were found, and they were higher in the vertical direction than in the longitudinal direction. The temperatures measured in the AOZ at 0.25 m height, were on average, 7 °C warmer than that at 1.5 m height. The AOZ temperature correlated better with temperatures measured at 0.7 m or 1.5 m height in the same pen than with temperatures measured in the AOZ at other pens. The analyses show that a proportional–integral based control system effectively counteracts the effects of outdoor wind conditions, and the control system is capable of maintaining the defined optimal temperature at the measurement height. However, the optimum temperatures at the measurement heights above AOZ do not correspond to the measured temperatures in the AOZ.
KW - Animal housing
KW - Automatically controlled windows
KW - Diurnal variation
KW - Hybrid ventilation
KW - Spatial variation
KW - Temperature distribution
U2 - 10.1016/j.biosystemseng.2020.09.006
DO - 10.1016/j.biosystemseng.2020.09.006
M3 - Journal article
AN - SCOPUS:85091653108
VL - 200
SP - 123
EP - 137
JO - Biosystems Engineering
JF - Biosystems Engineering
SN - 1537-5110
ER -
ID: 249425441