단동온실 천창형상 변화에 따른 열유동특성 해석

A Numerical Analysis on Thermal-flow Characteristics in Single-span Greenhouse with Different Shapes of Roof Windows

Recently, there are lots of increasing interest in smart farming that represents application of modern Information and Communication Technologies (ICT) into agriculture. In order to obtain optimal geometry of smart greenhouse, various design parameters need to be evaluated. In the present study, the numerical simulation using a commercial Computational Fluid Dynamics (CFD) code was implemented to figure out the internal thermal-flow characteristics. In order to numerically model solar radiation that spread over a wide range of wavelengths, the multiband model that discretizes the spectrum into finite bands of wavelength based on Wien’s law is applied to the simulation. In addition, absorption coefficient of vinyl that is varied with the bands of wavelength is also applied based on Beer-lambert law. To validate the numerical method, the numerical results of the temperature at specific monitoring points were compared with the experimental data. The average error rates (12.2~14.2 %) between them was shown and numerical results are in good agreement with the experimental data. Additionally, effect of shape of roof windows on thermal-flow characteristics inside single-span green house was evaluated. The results of the present study can be useful information for the design of various greenhouses.