Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Estimation of THI Index to Evaluate Thermal Stress of Animal-occupied Zone in a Broiler House Using BES Method

BES 기법을 이용한 육계사 내부 고온 스트레스 평가를 위한 THI 지수 모의

  • Ha, Taehwan (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Kwon, Kyeong-seok (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Hong, Se-Woon (Food, Agricultural and Biological Engineering, The Ohio State University) ;
  • Choi, Hee-chul (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Jun-yeob (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Lee, Dong-hyun (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Woo, Saemee (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Yang, Ka-young (Animal Environment Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Rack-woo (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Yeo, Uk-hyeon (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, Sangyeon (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, In-bok (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University)
  • Received : 2017.09.27
  • Accepted : 2018.01.08
  • Published : 2018.03.31
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Abstract

Thermal stress of livestock has been issued due to recent climate change trends and this causes reproductive disorders, decreased feed consumption, immunosuppression, and increased mortality of animals. Concept of THI has been widely used to quantitatively evaluate the degree of thermal stress for animals, however use of this concept is restricted for animals living in the enclosed facilities such as mechanically ventilated broiler houses. In this study, time-based internal energy flow and variation trends of temperature and humidity were analyzed based on BES technique. Local weather data, insulation characteristics of building materials, heat and moisture generation rate from broilers according to age, algorithm of ventilation operation were adopted for boundary condition of the model to accurately compute THI values inside the mechanically ventilated broiler house. From the BES computation, excess frequency of THI threshold in Jeju city was highest on the assumption that air conditioning equipments were not installed. When general raising density ($39kg\;m^{-2}$) was adopted, total 2,191 hours were exceeded. Excess hours of THI threshold were strongly related to the cumulative air temperature ($R^2=0.87$).

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References

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