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스마트온실의 에너지 분석 모델 개발 및 냉방 패키지 성능 분석
구자빈(Goo Ja-Bin),신학종(Shin Hak-jong),곽영훈(Kwak Young-Hoon),허정호(Huh Jung-Ho) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.6
Through active cooling, smart farms equipped with environmental control systems can overcome the limitations of existing greenhouses that are closed due to heat damage in summer. The control system can extend the crop harvest period by maintaining growth temperature and maintain fixed crop quality throughout the year. Accordingly, there is an increasing need for a cooling performance analysis model for smart farm cooling system applications. Therefore, in this study, a cooling package applicable to greenhouses was proposed, and the energy consumption of the cooling package was analyzed using EnergyPlus. Through consideration and analysis of previous studies, three cooling packages, which included natural ventilation and shading – basic cooling methods – were set up. A greenhouse energy model was developed for a smart farm in Naju. Prior to modeling the cooling packages, the predicted temperature and relative humidity performance of the greenhouse model was verified based on 24-hour measurement data from 9/16 to 9/17 for greenhouses without cooling. The greenhouse model showed performance that satisfied the recommended error value of MBE = -5.8, -6.3% and Cv(RMSE) = 8.7, 8.9% at the dry bulb temperature and relative humidity, respectively. On the basis of the verified model, plant evapotranspiration was simulated using the Stanghellini model, and cooling performance was analyzed using the three cooling package models. Package 1 showed an energy consumption of 20 W/㎡, which is advantageous in terms of energy cost, but cannot maintain an appropriate growth environment. Packages 2 and 3 were found to be disadvantageous in terms of energy cost because of their relatively high energy consumption, but could be advantageous in maintaining growth temperature.
축사의 초기 설계를 위한 가변형 에너지 모델 생성 툴 개발 및 변수별 에너지 분석
강정아(Kang, Jeong-A),신학종(Shin, Hak-Jong),곽영훈(Kwak, Young-Hoon),허정호(Huh, Jung-Ho) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.1
In the case of pig house, animals react sensitively to the indoor heat environment, so appropriate air conditioning control is required to secure productivity. Accordingly, there is a growing interest in analyzing the possibility of energy reduction in pig house using an energy model. However, in the case of the Whole building energy model, which enables precise energy analysis, it is difficult for non-experts to use it, especially in pig house where construction is often performed without the participation of a building engineer. In the case of a pig house, compared to a general building, it is possible to analyze the energy using the Whole building energy model by setting a simple input variable because it has a relatively simple building type and similar internal environmental conditions for each house. In this study, we developed a tool that can analyze the energy demand of a pig house by changing the design parameters only by inputting a few numerical values without a separate 3D modeling. If this is used, it is considered that the possibility of energy reduction according to the design conditions can be analyzed during the initial design stage of the pig house.
벤로형 온실의 냉방설비 패키지 적용 타당성 분석도구 개발
구자빈(Ja Bin Goo),신학종(Hak Jong Shin),곽영훈(Young Hoon Kwak),허정호(Jung Ho Huh) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Due to the high temperature and humid summer temperatures in Korea, most of them are closed because they cannot maintain the proper growing environment of cultivated crops. Therefore, the need for cooling systems such as heat pump is increasing along with cooling using facility elements such as shading screens and ventilation windows to suppress high-temperature damage and grow throughout the year. Accordingly, in this work, we aimed to present a tool to form applicable cooling packages to maintain an appropriate growth environment in greenhouses and analyze the feasibility of package application based on energy requirements and cost aspects of cooling packages. In this work, three applicable cooling packages were formed to maintain the proper growth environment of greenhouses, and each package was combined with conditions by scale, region, crop, and covering materials to form a total of 1,296 simulation data. Based on this, we present a feasibility analysis program for package application under each condition by utilizing EXCEL to present the thermal environment, energy requirements and performance results of greenhouses. It is believed to be able to help fundamental energy-efficient greenhouse operations in that it enables a brief primary feasibility analysis for real farmers or non-experts who are difficult to utilize energy simulations.