Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Development of Straightforward Method of Estimating LMA and LMR using Computational Fluid Dynamics Technology

전산유체역학 기법을 이용한 공기연령 산정 방법의 개발

  • 박세준 (서울대학교 농업생명과학대학 지역시스템공학과 & 농업생명과학 연구원) ;
  • 이인복 (서울대학교 농업생명과학대학 지역시스템공학과 & 농업생명과학 연구원) ;
  • 홍세운 ;
  • 권경석 (서울대학교 농업생명과학대학 지역시스템공학과 & 농업생명과학 연구원) ;
  • 하태환 (서울대학교 농업생명과학대학 지역시스템공학과 & 농업생명과학 연구원) ;
  • 윤남규 (농촌진흥청 국립농업과학원 농업공학부 재해예방공학과) ;
  • 김형권 (농촌진흥청 국립원예특작과학원 시설원예시험장) ;
  • 권순홍 (부산대학교 생명자원과학대학 바이오산업기계공학과)
  • Received : 2013.11.04
  • Accepted : 2013.11.11
  • Published : 2013.11.30
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Abstract

Ventilation efficiency has an important role in agricultural facilities such as greenhouse and livestock house to keep internally optimum environmental condition. Age-of-air concept allows to assess the ventilation efficiency of an agricultural facility according to estimating the ability of fresh air supply and contaminants emission using LMA and LMR. Most of these methods use a tracer gas method which has some limitations in experiment like dealing unstable and invisible gas. Therefore, the aim of this study was to develop a straightforward method to calculate age-of-air values with CFD simulation which has the advantage of saving computational time and resources and these method can solve the limitations in experiment using tracer gas method. The main idea of LMA computation is to solve the passive scalar transport equation with the assumption that the production of the time scalar throughout the room is uniform. In case of LMR calculation, the transport of the time scalar was reversed compulsively using UDF. The methodology to validate the results of this study was established by comparing with preceding research that had performed a computing LMA and LMR value by laboratory experiments and CFD simulations using tracer gas. As a result, the error was presented similarly level of results of preceding research. Some big errors could be caused by stagnated area and incongruity turbulence model. while the computational time was reduced to almost one fourth of that by preceding research.

Keywords

References

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