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온실용 이중피복 및 보온재의 관류열전달계수 산정을 위한 수치적 연구

A Numerical Study for Calculation of Overall Heat Transfer Coefficient of Double Layers Covering and Insulation Material for Greenhouse

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  • URLhttps://db.koreascholar.com/Article/Detail/311264
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경북대학교 농업생명과학대학 (College of Agriculture and Life Sciences)
초록

This study calculated the overall heat transfer coefficient (U-value) of greenhouse covering materials with thermal screens using a simulation model and then estimated the validity of the calculated results by comparison with measured values. The U-value decreased gradually as the thickness of the air space between the double glazing increased, and then remained essentially constant at thicknesses exceeding 25 mm. The U-value also increased with the difference in temperature between the inside and outside of the hot box. The vigorous convective heat transfer between two plastic films caused unsteady heat flow and then created a nonlinear temperature distribution in the air space. The distance did not affect the U-value at distances of 50~200 mm between the plastic covering and thermal curtain. The numerical calculation results, with and without sky radiation, were in accord with the experimental results for a 30°C temperature difference between the inside and outside of the hot box. In conclusion, a reliable Uvalue can be calculated for a temperature difference of 30°C or more between the inside and outside of the hot box.

저자
  • Jong-Won Lee(경북대학교 농업과학기술연구소) | 이종원
  • Dong-Keon Kim(부산대학교 기계기술연구원) | 김동건
  • Hyun-Woo Lee(경북대학교 농업토목공학과) | 이현우 Corresponding author