Optimization and computational fluid dynamics analysis of fan operation for cascading cage-rearing meat duck house in summer

doi:10.3969/j.issn.1004-1524.2023.03.20

Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (3): 666-675.DOI: 10.3969/j.issn.1004-1524.2023.03.20

• Biosystems Engineering • Previous Articles Next Articles

Optimization and computational fluid dynamics analysis of fan operation for cascading cage-rearing meat duck house in summer

LIN Yong¹(), DAI Weiwei², BAO Encai¹^,^*(), WANG Qiang³, BAI Zongchun¹, XIA Liru¹, ZHANG Yao³, SUN Yulun⁴, OUYANG Lihu⁴

1. Key Laboratory of Protected Agriculture Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
2. Dingyuan County Rural Revitalization Bureau, Dingyuan 233200, Anhui, China
3. School of Engineering, Anhui Agricultural University, Anhui 230036, China
4. Jiangsu Zhiqin Animal Husbandry Co., Ltd., Xuzhou 221223, Jiangsu, China

Received:2022-04-24 Online:2023-03-25 Published:2023-04-07

Abstract

Abstract:

To study and determine the key environmental parameter problem areas in the cascading cage-rearing meat duck house in summer, optimize the number and layout of fan operation, and realize precision environment control, a total of 23 measuring points were set in the 96 m (length)×17 m (width)×5.3 m (height) duck house to monitor the dynamics of temperature, relative humidity, wind speed and CO₂ concentration. Computational fluid dynamics (CFD) model of duck house was conducted to simulate the effects of different fan operation schemes on the distribution and evenness of temperature field and airflow field. The results showed that the indoor temperature ranged from 22.9 ℃ to 30.9 ℃, and the outdoor temperature varied from 17.6 ℃ to 36.6 ℃ during the test period. The relative humidity inside and outside the duck house was 48.1%-92.5% and 31.2%-100.0%, respectively. The variation tendency of indoor temperature and relative humidity were similar to that outside the duck house, while the changes of indoor temperature and relative humidity were smaller than that of outside. The indoor wind speed and CO₂ concentration were 0.79-1.32 m·s^-1 and 1 161-1 685 mg·m^-3, respectively. The distribution of temperature field and airflow field inside the duck house were simulated under the scenario when the highest air temperature outside the duck house was 36.6 ℃. When 10 fans with wet curtain cooling were used, the ventilation rate was 287 518 m³·h^-1, the mean temperature and mean wind speed were 30.9 ℃ and 1.08 m·s^-1, respectively. When additional two or four fans were running in response to the high temperature aera which was near the four column cages of center area inside the duck house, the ventilation rate was raised to 314 140, 367 384 m³·h^-1, respectively, and the temperature was reduced by 0.2, 0.4 ℃, respectively, and the mean wind speed was increased by 0.10, 0.30 m·s^-1, respectively, as compared with the original design. In addition, the area with weak ventilation under the original design was improved and the non-uniformity coefficient of airflow inside the duck house was decreased, which could meet the cooling requirement. Thus, accurate regulation of the number and combination of running fans for the high temperature area inside the cascading cage-rearing meat duck house could improve the airflow distribution and realize better cooling effect in summer.

Key words: cascading cage-rearing, meat duck, environmental quality, temperature field, airflow field

CLC Number:

S834

LIN Yong, DAI Weiwei, BAO Encai, WANG Qiang, BAI Zongchun, XIA Liru, ZHANG Yao, SUN Yulun, OUYANG Lihu. Optimization and computational fluid dynamics analysis of fan operation for cascading cage-rearing meat duck house in summer[J]. Acta Agriculturae Zhejiangensis, 2023, 35(3): 666-675.

Figures/Tables 8

Fig.1 Schematic diagram of test duck house A, Floor plan; B, Schematic diagram of evaporative cooling pad; C, Structure profile in the middle of the duck house; D, Schematic diagram of fan number (from inside to outside). ● shows the test position of temperature, relative humidity, wind speed, CO2 concentration. ①- shows the serial No. of fans. Values in figures are in mm.

Fig.2 Dynamics of indoor and outdoor temperature and relative humidity during experiment

Fig.3 Dynamics of indoor wind speed and CO2 concentration during experiment

Fig.4 Three dimensional geometric model of duck house

Fig.5 Comparison of measured temperature or wind speed values with simulated results

Fig.6 Simulation contour plots of temperature at planes of 24, 48, 72 m from gable with evaporative cooling pad under varied fan operation schemes

Fig.7 Simulation contour plots of air speed at planes of 24, 48, 72 m from gable with evaporative cooling pad under varied fan operation schemes

Fig.8 Simulation contour plots of airflow field in different layers under varied fan operation schemes

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Optimization and computational fluid dynamics analysis of fan operation for cascading cage-rearing meat duck house in summer

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