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2019 Vol.28, Issue 3 Preview Page
Efficiency of Different Roof Vent Designs on Natural Ventilation of Single-Span Plastic Greenhouse
Adnan Rasheed1
,
Jong Won Lee2
,
Hyeon Tae Kim5
,
Hyun Woo Lee134*
라쉬드 아드난1
,
이 종원2
,
김 현태5
,
이 현우134*
1Department of Agricultural Engineering, Kyungpook National University, Daegu 702-701, Korea
2Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries, 1515, Kongjwipatjwi-ro, Deokjin-gu, Jeonju-si, Jeollabuk-do 54874, Republic of Korea
3Institute of Agricultural Science & Technology, Kyungpook National University, Daegu 702-701, Korea
4Department of Bio-Industrial Machinery Enineering., GyeongsangNational University.
5Department of Bio-Industrial Machinery Enineering., GyeongsangNational University. (Institute of Agricultural and Life Sciences), Jinju 660-701, Korea
*Corresponding author: whlee@knu.ac.kr
30 July 2019. pp. 225-233
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Abstract

In the summer season, natural ventilation is commonly used to reduce the inside air temperature of greenhouse when it rises above the optimal level. The greenhouse shape, vent design, and position play a critical role in the effectiveness of natural ventilation. In this study, computational fluid dynamics (CFD) was employed to investigate the effect of different roof vent designs along with side vents on the buoyancy-driven natural ventilation. The boussinesq hypothesis was used to simulate the buoyancy effect to the whole computational domain. RNG K-epsilon turbulence model was utilized, and a discrete originates (DO) radiation model was used with solar ray tracing to simulate the effect of solar radiation. The CFD model was validated using the experimentally obtained greenhouse internal temperature, and the experimental and computed results agreed well. Furthermore, this model was adopted to compare the internal greenhouse air temperature and ventilation rate for seven different roof vent designs. The results revealed that the inside-to-outside air temperature differences of the greenhouse varied from 3.2 to 9.6°C depending on the different studied roof vent types. Moreover, the ventilation rate was within the range from 0.33 to 0.49 min-1. Our findings show that the conical type roof ventilation has minimum inside-to-outside air temperature difference of 3.2°C and a maximum ventilation rate of 0.49 min-1.

Keywords
bacterial wilt
air flow
CFD
greenhouse cooling
greenhouse thermal environment

여름철에 자연환기는 온실의 온도를 낮추는데 중요한 역할을 한다. 온실의 형태, 환기창 종류, 환기창의 위치 등은 자연환기 성능에 큰 영향을 미친다. 본 연구에서는 전산유체역학(CFD)을 이용하여 다양한 천창구조에 대하여 측창에 따른 부력환기 효과를 비교분석 하였다. Boussinnesq 가정을 사용하여 전체 계산영역에 대한 부력효과를 시뮬레이션 하였다. 또한 RNG K-ε 난류모델을 사용하였다. 일사량 효과를 시뮬레이션 하기위해 Solar ray tracing과 함께 Discrete originates (DO) radiation 모델을 사용하였다. 실험온실 내부의 온도를 측정하여 CFD모델을 검증하였으며, 실험값과 계산값이 잘 일치하는 것으로 나타났다. 7가지의 천창구조에 대하여 온실의 내외부 온도차이와 환기횟수를 비교하였다. 내외부온도의 차이는 3.2~9.6°C 범위로 나타났고, 환기횟수는 0.33~0.49min-1 범위로 나타났다. 고깔형 천창구조 온실의 경우 내외부 온도차이가 3.2°C로 가장 낮았고 환기횟수도 0.49min-1로 가장 높게 나타나 환기효과가 가장 우수한 것으로 나타났다.

키워드
공기유동
온실냉방
온실 열환경
전산유체역학
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 28
  • No :3
  • Pages :225-233
  • Received Date : 2019-06-30
  • Revised Date : 2019-07-22
  • Accepted Date : 2019-07-23
  • DOI :https://doi.org/10.12791/KSBEC.2019.28.3.225
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