[논문]BES를 이용한 온실용 보온커튼의 관류열전달계수 산정

라쉬드아드난; 이종원; 이현우

doi:10.12791/ksbec.2018.27.4.294

[국내논문] BES를 이용한 온실용 보온커튼의 관류열전달계수 산정
Evaluation of Overall Heat Transfer Coefficient of Different Greenhouse Thermal Screens Using Building Energy Simulation 원문보기

시설원예ㆍ식물공장 = Protected horticulture and plant factory, v.27 no.4, 2018년, pp.294 - 301

라쉬드아드난 (경북대학교 농업토목공학과) , 이종원 (한국농수산대학 원예환경시스템학과) , 이현우 (경북대학교 농업토목공학과)

초록
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겨울철에 열손실을 줄이기 위해 많은 온실에서 보온커튼을 사용하고 있다. 그러나 적절한 보온커튼을 선택할 때 판단 자료로 활용할 수 있는 명확한 기준이 없는 실정이며 이를 위해서는 보온재의 보온 특성에 대한 정량적인 값이 필요하다. 본 연구에서는 BES를 사용하여 보온커튼의 관류열전달계수를 산정하는 시뮬레이션 모델을 개발하였다. 일중 및 이중 PE필름 피복에 대한 관류열전달계수의 실험값을 사용하여 시뮬레이션 결과를 검증하였다. 검증된 모델을 사용하여 문헌에서 제시된 각종 열적 특성을 가진 보온커튼에 대한 관류열전달계수를 산정하고 비교분석하였다. 개발된 시뮬레이션 모델은 다양한 보온커튼의 관류열전달계수를 산정하는 데 활용될 수 있을 것이며, 제시된 관류열전달계수는 보온커튼의 성능을 정량적으로 비교하는데 유용하게 활용될 수 있을 것으로 판단된다.

Abstract ▼ AI-Helper

In winter, thermal screens are widely used to reduce heat loss from greenhouse to save energy. Unfortunately, not much data are available to the farmer to compare thermal screens while selecting the one that meets their specific requirements. Thus, there is a need to investigate the thermal performance of thermal screens. To address this issue, the Building Energy Simulation (BES) model of a hot box was used to calculate the overall heat transfer coefficient (U-value) of the thermal screens. To validate the model, computed and experimental U-values of single-and double-layered polyethylene (PE) material were compared. This validated model was used to predict the U-values of the selected thermal screens under defined weather conditions. We quantified the U-values of each selected material and significant changes in their U-values were noted in response to different weather conditions. Notably, the thermal properties of the tested screens were taken from the previous literature to calculate U-values using the BES model. The U-values of the thermal screens can help researchers and farmers evaluate their screens and make pre-design decisions that suit their investment capabilities.

주제어

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문제 정의

Prior to this study, validated data for thermal screen properties were lacking. In this study, we used thermal properties of different thermal screen materials provided in a previous study and presented our results accordingly. Our future work will include measurements of the properties of different thermal screens available in the market and calculation of their U-values to help farmers select the best thermal material from among them.

제안 방법

A BES model, designed and calibrated in our previous study (Rasheed et al., 2017) for the investigation of U-values of the covering materials of the greenhouse, was used to run the simulations for the thermal screens. The model was developed by utilizing TRNSYS 18, as a BES program.
The calibrated and validated model was then used to investigate the U-values of the single thermal screens presented in Table 1, using the thermal properties shown in Table 2. Further investigations were conducted to calculate the U-values of the single thermal screens with combinations of single-layered PE material. The thermal properties of the PE material are shown in Table 3 (Valera et al.
, 2009). The BES model was validated by comparing the simulation to the experimental results of the single- and double-layered PE material with and without night sky radiation.
It is used for the simulation of thermal systems and has been available for 40 years. The complete package consists of a series of programs and add-ons to enable its use for simulations of projects with complex designs (Klein, 2012). This program can also be used in tandem with many other softwares (e.
To achieve a desirable internal temperature with reference to that outside the hot box, a heating device was introduced from the bottom. The experiments were conducted during nighttime to observe the radiative heat loss during this time. A unit of dimensions 1000×1000mm² was placed 200mm above the hot box.

이론/모형

In this study, we used a previously proposed BES model of a hot box (Rasheed et al., 2017) to calculate the overall heat transfer coefficient (U-value) of greenhouse thermal screens. A number of screen materials available in the South Korean market were selected for this investigation under different weather conditions.
, 2017) for the investigation of U-values of the covering materials of the greenhouse, was used to run the simulations for the thermal screens. The model was developed by utilizing TRNSYS 18, as a BES program. For this study, we used following features of TRNSYS 18, simulation studio, TRNBuild, and the following programs were applied for pre-processing the simulations: Berkeley Lab Window 7.
It was used to measure the U-value of single- and double-layered polyethylene (PE) for validation purposes. The whole apparatus was designed according to the American Society for Testing and Materials (ATSM) standards C-236-89 (ATSM, 1993). The dimensions of the hot box were 800 × 800×900mm³, with the base and walls made of 100-mm thick polystyrene insulation material.

성능/효과

The results showed that for the lower inside-to-outside temperature difference, the U-value was very high, and as the inside-to-outside temperature difference increased, the Uvalue started decreasing and became stabilized after reaching a temperature difference of 20°C.

참고문헌 (20)

ASTM, 1993. Standard test method for steady-state thermal performance of building assemblies by means of a guarded hot box. ASTM standards C236-89: 52-62.
Chung, S.W., D.K. Kim, S.G. Lee, S.H. Nam and Y.B. Lee. 2009. Heat insulation characteristics of multi layer materials for greenhouse. Journal of Bio-Environmental Control 18(4): 341-347 (in Korean).
Diop, S., J.W. Lee and H.W. Lee. 2014. Measurement and comparison of overall heat transfer coefficients for greenhouse covering materials with thermal screens. Journal of The Korean Society of Agricultural Engineers 56(4): 41-51.
Diop, S., J.W. Lee, W.H. Na and H.W. Lee. 2012. Overall heat transfer coefficient measurement of covering materials with thermal screens for greenhouse using the hot box method. Journal of the Korean Society of Agricultural Engineers 54(5): 1-7.
Feuilloley, P. and G. Issanchou. 1996. Greenhouse covering materials measurement and modelling of thermal properties using the hot box method, and condensation effects. Journal of Agricultural Engineering Research 65(2): 129-142.

상세보기
Ghosal, M.K. and G.N. Tiwari. 2004. Mathematical modeling for greenhouse heating by using thermal curtain and geothermal energy. Solar Energy 76(5): 603-613.

상세보기
Hemming, S., E.B. Romero, V. Mohammadkhani and B. Van Breugel 2017. Energy saving screen materials: Measurement method of radiation exchange, air permeability and humidity transport and a calculation method for energy saving. Wageningen University & Research, BU Greenhouse Horticulture.
Kim, Y.B., S.Y. Lee and B.R.J.J.O.B.-E.C. Jeong. 2009. Analysis of the insulation effectiveness of the thermal insulator by the installation methods. Journal of Bio-Environmental Control 18(4): 332-340 (in Korean).
Kim, Y.B., J.C. Park, M.R. Huh, S.Y. Lee and S.W.J.J.O.B.-E.C. Jeong. 2007. Effectiveness of the aluminum thermal screens depending on the allocation type. Journal of Bio-Environmental Control 16(4): 284-290 (in Korean).
Kittas, C., N. Katsoulas and A. Baille. 2003. Influence of an aluminized thermal screen on greenhouse microclimate and canopy energy balance. Transactions of the ASAE 46(6): 1653-1663.

상세보기
Klein, S.A. 2012. Trnsys, a transient system simulation program. Solar Energy Laborataory, University of Wisconsin--Madison.
A. and B.M. Suman. 2013. Experimental evaluation of insulation materials for walls and roofs and their impact on indoor thermal comfort under composite climate. Building and Environment 59: 635-643.

상세보기
Lee, J.W., D.K. Kim and H.W. Lee. 2015. A numerical study for calculation of overall heat transfer coefficient of double layers covering and insulation material for greenhouse. Current Research on Agriculture and Life Sciences 33(2): 41-47 (in Korean).
Park, B.S., T.H. Kang and C.S. Han. 2015. Analysis of heating characteristics using aluminum multi-layer curtain for protected horticulture greenhouses. Journal of Biosystems Engineering 40(3): 193-200.

원문보기 상세보기
Rasheed, A., J. Lee and H. Lee. 2018. Development and optimization of a building energy simulation model to study the effect of greenhouse design parameters. Energies 11(8): 1-19.
Rasheed, A., J.W. Lee and H.W. Lee. 2015. A review of greenhouse energy management by using building energy simulation. Protected Horticulture and Plant Factory 24(4): 317-325.

원문보기 상세보기
Rasheed, A., J.W. Lee and H.W. Lee. 2017. Development of a model to calculate the overall heat transfer coefficient of greenhouse covers. Spanish Journal of Agricultural Research. 15(4): 1-11.
Teitel, M., M. Barak and A. Antler. 2009. Effect of cyclic heating and a thermal screen on the nocturnal heat loss and microclimate of a greenhouse. Biosystems Engineering. 102(2): 162-170.

상세보기
Valera, M.D., A.F. Molina and M.A. Alvarez 2008. Protocolo de auditoria energetica en invernaderos. Auditoria Energetica De Un Invernadero Para Cultivo De Flor Cortada En Mendigorria, Madrid, Instituto Para La Diversificacion Y Ahorro De La Energia (in spanish).
Yang, S.H., C.G. Lee, W.K. Lee, A.A. Ashtiani, J.Y. Kim, S.D. Lee and J.Y. Rhee. 2012. Heating and cooling system for utilization of surplus air thermal energy in greenhouse and its control logic. Journal of Biosystems Engineering. 37(1): 19-27.

원문보기 상세보기

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