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http://dx.doi.org/10.12791/KSBEC.2020.29.1.73

Analysis on Heat Loss of Single-span Greenhouse Using Small-scaled Wind Tunnel  

Kim, Young Hwa (Energy & Environmental Engineering Division, NAAS, RDA)
Kim, Hyung kow (Energy & Environmental Engineering Division, NAAS, RDA)
Lee, Tae suk (Energy & Environmental Engineering Division, NAAS, RDA)
Oh, Sung sik (Energy & Environmental Engineering Division, NAAS, RDA)
Ryou, Young sun (Energy & Environmental Engineering Division, NAAS, RDA)
Publication Information
Journal of Bio-Environment Control / v.29, no.1, 2020 , pp. 73-79 More about this Journal
Abstract
The objective of this study is to analyze the heat transfer loss of covering materials in a single-span plastic greenhouse under the steady-state wind environment. To achieve this objective, the following were conducted: (1) design of a small-scaled wind tunnel (SCWT) to analyze heat losses of the greenhouse and its performance; (2) determination of the overall heat transfer coefficient (OHTC) for the covering materials using a small-scaled greenhouse model. The SCWT consists of the blowing, dispersion, steady flow, reduction and testing areas. Each part of the SCWT was customized and designed to maintain air flow at steady state and to minimize the variances in the SCWT test. In this study, the OHTCs of the covering materials were calculated by separating each with the roof, side wall, front and back of the small-scaled greenhouse model. The results of this study show that the OHTC of the roof increases as wind speed increases but the zones in which the increase rate of the OHTC decreased, were distinguished by wind tunnel wing speed of 2 ms-1. For the side wall, the increase rate of the OHTC was particularly higher in the 0-1 ms-1 zone.
Keywords
covering materials; overall heat transfer coefficient; surface temperature; wind direction;
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Times Cited By KSCI : 1  (Citation Analysis)
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