• Title/Summary/Keyword: 보온효과

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Energy Saving Effect of a Greenhouse with New Laborsaving Opening & Closing System of Thermal Tunnel Film (보온터널 개폐 생력화 장치를 이용한 온실의 난방에너지 절감 효과)

  • Ryou, Y.S.;Kang, G.C.;Kim, Y.J.;Paek, Y.;Jang, C.H.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2002.07a
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    • pp.255-260
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    • 2002
  • 일반적으로 온실의 효과적인 온도관리를 위해서는 단열효과가 우수한 보온재를 이용하거나 또는 난방공간의 체적을 최소화 할 수 있는 터널재배가 바람직하다. 지금까지는 딸기, 수박 등 키가 작은 작물에 한하여 보온터널재배가 이루어지고 있는 실정이나, 보온터널의 개폐를 인력에 의존하고 있기 때문에 노동력이 많이 들고, 개폐에 소요되는 시간도 상당한 비중을 차지하고 있다. (중략)

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Heat Insulation Characteristics of Multi Layer Materials for Greenhouse (시설원예용 조합형 다겹보온자재의 보온 특성)

  • Chung, Sung-Won;Kim, Dong-Keon;Lee, Suk-Gun;Nam, Sang-Heon;Lee, Yong-Beom
    • Journal of Bio-Environment Control
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    • v.18 no.4
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    • pp.341-347
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    • 2009
  • Experiments and computations were conducted to investigate the heat insulation characteristics of multi layer materials for cultivation greenhouse. In case of the experiments, measurements of temperature were carried out with a K-type thermocouples and data logger to research the heat transfer in the experimental module generated by the heat source. A thermal conductivity meter, QTM-500 based on modified transient hot wire method was used to measure the thermal conductivity of multi layer materials. The numerical analyses were performed by commercial code CFX-11 according to the variation of multi layer materials without air layer. The experimental results showed that the heat insulation of multi layer materials was higher than single layer materials by 50~90%. It was found that the effect of heat insulation was raised by the combination of multi layer materials.

Comparison of Heat Insulation Characteristics of Multi-layer Thermal Screen and Development of Curtain System (다겹보온자재의 보온성 비교 및 커튼개폐장치 개발)

  • Lee, Si-Young;Kim, Hark-Joo;Chun, Hee;Yum, Sung-Hyun;Lee, Hyun-Joo
    • Journal of Bio-Environment Control
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    • v.16 no.2
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    • pp.89-95
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    • 2007
  • This study was accomplished to compare energy saving effects of several heat insulation materials in greenhouse and to develop new automatic opening and closing equipment which is suitable to the most effective heat insulation material. To find out more effective heat insulation material, the magnitude of heat transfer occurred through aluminum screen (ALS), non-woven fabric (NWF), double-layer aluminum screen with chemical cotton sheet (DAL), and multi-layer fabric screen material quilted with non-woven fabric, chemical cotton, poly foam, and polypropylene (MLF) were compared relatively. The results showed that the relative magnitude of heat transfer occurred through MLF was lower than DAL and ALS by 23.3% and 43.0% respectively. MLF screen material was the most effective compared with other heat insulation materials. But because of thickness, there was a need of new mechanism for automatic operation in greenhouse. Accordingly, new screen system using MLF-thick but profitable for keeping warm in greenhouse-was developed. Opening & closing equipment was designed to roll MLF with pipe axis during opening process and pull MLF with string during closing process with electric motors, clutches, drums, and so on. In hot pepper cultivation and energy saving test during winter time, the early stage yield of pepper under MLF screen system was higher than NWF by 27%, and gasoline consumption of MLF screen system was lower than NWF by 46%.

Analysis of the Insulation Effectiveness of the Thermal Insulator by the Installation Methods (보온단열재의 설치방법에 따른 보온성 효과 분석)

  • Kim, Young-Bok;Lee, Si-Young;Jeong, Byoung-Ryong
    • Journal of Bio-Environment Control
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    • v.18 no.4
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    • pp.332-340
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    • 2009
  • In this study, the thermal insulation effectiveness of the greenhouse insulators by the installation methods was investigated to find the right installation way of the insulation materials. Physical properties of the insulators such as thickness, air transmissivity, apparent density, ultraviolet rays cutoff ratio, reflectance, thermal conductivity, moisture absorptivity were evaluated and the insulation ability of the insulators were measured by the module experiments. For the same insulator, the insulation ability of the case with the outward direction of the black colored face, i.e., with the inward direction of the white colored face, was better than that of vice versa. The case of the black colored both surfaces was better than the case of the white colored both surfaces. For aluminium reflection material, the case with the outward direction of the lustre face, i.e., with the inward direction of the non-lustre face, was better than that of vice versa. For the same material with the inner thin polyethylene foam (or polyester) and the chemical wool, the case with the outward direction of the inner thin polyethylene foam (or polyester), i.e., with the inward chemical wool, was better than that of vice versa. Addition of the inner thin polyethylene foam increased the insulation effect very much.

Evaluation of Thermal Insulation Properties of Covering Materials to Protect Peach Trunks against Freezing Injury (복숭아 주간부 동해 예방을 위한 피복재의 보온성 평가)

  • Shin, Hyunsuk;Yun, Seok Kyu;Choi, In Myung;Kim, Sung Jong;Yun, Ik Koo;Nam, Eun Young;Kwon, Jung Hyun
    • Journal of Bio-Environment Control
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    • v.25 no.4
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    • pp.288-293
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    • 2016
  • The study was performed to evaluate thermal insulation covering materials (TICMs) to protect peach trunks against freezing temperatures in winter season by investigating thermo-physical properties and practical thermal insulation effect of the TICMs which was made of white non-woven fabrics, yellow paper sheets, and waterproof fabric pads. Among the three TICMs, Waterproof fabric pad (double layer) possessed the best performance about thermal insulation rate and thermal resistance among three kinds of TICMs. Day thermal insulation effects of waterproof fabric pad, which prevent from temperature rise on the bark tissues of trunks during the day time, were $14.09^{\circ}C$. Night thermal insulation effects of them, which prevent from temperature decline on the bark tissues of trunks at night time, were $7.23^{\circ}C$. Waterproof fabric pad showed the highest day and night thermal insulation effects. Thus our results suggest that development of TICMs using waterproof fabric pad might be helpful to protect the bark tissues of trunks from freezing injury.

Effects of Covering Materials and Methods on Heat Insulation of a Plastic Greenhouse and Growth and Yield of Tomato (플라스틱하우스의 보온피복 재료 및 방법이 보온력과 토마토의 생육 및 수량에 미치는 영향)

  • Kwon Joon Kook;Lee Jae Han;Kang Nam Jun;Kang Kyung Hee;Choi Young Hah
    • Journal of Bio-Environment Control
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    • v.13 no.4
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    • pp.251-257
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    • 2004
  • This experiment was carried out to investigate the effects of different covering materials and methods on heat insulation of a plastic greenhouse, growth and yield of tomato. Night air and soil temperatures in a double-layer greenhouse with external multifold thermal cover (MTC; eight-ounce cassimere+four-fold polyform+double-fold non-woven fabric+single-fold polypropylene covering were about $1^{\circ}C$ lower than in that with internal MTC covering, but about $3^{\circ}C$ higher than in that with an EVA film screen. Tomato yield in the external MTC covering increased by $2\%\;and\;19\%$ as compared to that in the internal MTC covering and the non-covering of MTC, respectively, due to its high light transmission and insulation effect. Night air temperatures in a double-layer greenhouse with external MTC covering and with thermal screen (polyester plus aluminium) were $2.2^{\circ}C\;and\;4.5^{\circ}C$ higher than those in a double-layer greenhouse with an external MTC covering and in a double-layer greenhouse equipped an EVA film screen, respectively. Tomato yield in the treatment with external MTC covering and a thermal screen was $18\%\;and\;37\%$ greater than that in the external MTC covering and in an EVA film screen, respectively. Results indicate that tomato could be grown without heating or with minimal heating in a double-layer greenhouse covered with MTC and a thermal screen during the winter season in sourthern regions of Korea.

Thermal Insulation Effect of a Double Film Water Curtain System in Greenhouse (이중필름 수막시스템의 보온효과)

  • 남상운;허연정;심옥자;심상일;이호상
    • Proceedings of the Korean Society for Bio-Environment Control Conference
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    • 1998.05a
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    • pp.16-21
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    • 1998
  • 우리나라는 시설재배 난방용 에너지로 경유를 90%이상 사용하고 있는데 최근 급격한 유가의 상승으로 생산비중 난방비가 차지하는 비중이 20∼25%에서 30∼40%로 높아져 시설원예 농가의 경제성이 크게 악화되고 있다. 이를 극복하고 안정적인 생산을 계속하기 위하여 보온력 향상이나 자연에너지 이용 기술에 관한 지속적인 기술개발과 보급이 필요할 것으로 생각된다. (중략)

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Development and Commercialization of Warm Covers Using Natural Fabric (천연 소재를 이용한 보온덮개 개발 및 사업화 방안)

  • Choi, Ju-Hyun;Beak, Hyun-Kuk;Cho, Yun-Jin
    • Journal of Convergence for Information Technology
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    • v.8 no.1
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    • pp.227-233
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    • 2018
  • The purpose of this study was to develop a warm cover for greenhouse with excellent thermal insulation and to propose ways of commercialization of the product. Feathers were used as filling materials because they formed the air layer to enhance insulation. Instead of downs for clothing or other textile products, we used disposed feathers. The developed product covers the outside of the greenhouse to keep the crops warm. It has multiple layers including feathers as filling materials, padding, inside fabric, heat insulation materials and outer fabric. It has proven to improve the insulation ratio. We developed other kinds of warm covers that are applicable to the inside of the greenhouse or the small houses in the greenhouse. Also, R&D system of educational industrial complex enables us to commercialize the products and building marketing strategies for them. This technology contributes to the expansion of energy-saving facilities for farmers, and it can serve the development and spread of various products utilizing feather.