• Journal of Advanced Marine Engineering and Technology
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• v.41 no.1
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• pp.99-104
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• 2017

This study evaluated the heating performance of a hybrid heat pump system. The system was installed in a $100-m^2$ greenhouse to utilize surplus solar energy. A hybrid heat pump system was installed at Jocheon-ri, Jeju Island, for an empirical evaluation of the performance. The system consists of a heat storage tank and plate heat exchangers for several heat exchanges between the greenhouse and heat pump or storage tank. The system uses R410a as the working fluid and is controlled automatically by a defined set temperature of the greenhouse. This system incorporates two kinds of heat sources: outdoor air and a storage tank that collects heat from the topside of the greenhouse. The results showed that the heating capacity was 19.9 kW in the outdoor air source mode and 21.4 kW with direct heating from hot water in the thermal storage tank. These results are very similar to those of a previous study.

• Korean Journal of Environmental Agriculture
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• v.36 no.3
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• pp.193-200
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• 2017

BACKGROUND: Plant growth under smart greenhouse (that is plant factory system) conditions of an artificial light type is significantly depending on the artificial light sources such as a fluorescent lamps or Light-Emitting Diodes (LEDs) with specific spectral wavelengths regardless of the outside environmental changes. In this experiment, characteristics on the growth and compound synthesis of kale seedlings affected by light qualities and intensities provided by LEDs were mentioned. METHODS AND RESULTS: The kale seedlings which developed 3~4 true leaves were exposed by fluorescent lamps or LEDs lights of red (R), blue+white (BW), blue+red (BR) with 50 (L) or $100(H){\mu}mol/m^2/s^1$ photosynthetic photon flux (PPF) under hydroponic culture system of deep flow technique for 50 days. Shoot fresh weight increased under the RH, BWH, and BRH treatments with higher PPF. Shoot elongation of the seedlings decreased, and polyphenol synthesis promoted by the higher light intensity conditions. Sugar synthesis in the leaves was above 2 times greater under the RH treatment of monochromic red light quality with $100{\mu}mol/m^2/s^1\;PPF$ than $50{\mu}mol/m^2/s^1\;PPF$. CONCLUSION: The results show that the control of light quality and intensity in the smart greenhouse conditions with artificial lights significantly affects the growth and compound synthesis in the fresh kale leaves with higher culture efficiency compared to the conventional soil culture under greenhouse or field conditions. Researches on the optimum light intensities of the LEDs with special spectral wavelengths are necessary for maximum growth and metabolism in the seedlings.

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.181-184
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• 2007

본 논문에서는 수경재배의 비중이 늘어난 만큼 새로운 친환경 저자 정밀 급액관리의 개발이 시급함을 언급하고 현재의 한계를 극복 할 수 있는 배액 제어법을 개발 하고자 한다. 급액관리 임베디드 시스템은 정확한 시간 제어, 일사량 제어 전자 방식으로서 수동식 배액 제어법의 문제점을 해결할 수 있으며 뿐만 아니라 사용자가 온실의 없을 경우에도 급액관리를 할 수 있도록 web기반으로 구현하여 편의를 도모하였다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.387-392
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• 2003

노동 집약적이던 농업은 급속한 기계화로 인하여 노동력의 절감은 여러 분야에서 이루어지고 있지만, 농업은 수익성이 높지 않아 여전히 사람들이 노동을 기피하는 산업중의 하나이다. 온실 자동화는 특용 작물 등의 고부가가치 상품을 중심으로 발전하고있다. 대부분의 기계 및 공정은 점차적으로 무인자동화로 발전되고 있으며, 작업의 편리성을 강조하고 있다. 앞으로의 농업기계는 무인자동화 시스템의 도입으로 인하여 누구나 손쉽게 작업설정을 하고 기계 스스로 원활하게 작업을 수행할 수 있도록 개선되어야 한다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.402-406
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• 2003

묘생산 시스템은 크게 개방형과 폐쇄형으로 구분된다. 개방형 묘생산 시스템은 시스템 내부와 외부의 공기ㆍ물ㆍ열 등의 교환이 가능한 시스템을 의미한다. 현재 실생묘, 삽목묘, 접목묘 등은 일사가 투과되는 온실 또는 묘포장에서 생산된다. 그러므로 온실 또는 묘포장을 이용한 묘생산 시스템은 개방형 묘생산 시스템에 해당한다. 개방형 묘생산 시스템에서는 외부기상의 변동에 따라 시스템 내의 기온, 상대습도, 광량, 기류속도, $CO_2$ 농도 등의 물리적 환경요인이 변화하므로 이들 환경 요인을 일정한 수준으로 제어하기가 쉽지 않다. 때문에 균일한 묘소질을 지닌 묘의 계획적 생산이 근본적으로 불가능하다. (중략)

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.569-572
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• 2012

식물공장의 다양한 건물형태에 따른 냉난방부하의 차이를 DesignBuilder를 이용하여 해석하였다. 엽채류 중 상추의 생육 적정온도인 $20^{\circ}C$를 실내온도로 설정하고 식물공장 외벽에 단일창호를 적용하여 온실형태에 따른 냉난방부하 변화를 계산하였다. 보광이 없는 건물자체의 냉난방부하를 계산한 결과 KNU 식물공장 단위유닛과 반원 온실형 식물공장이 냉방부하가 가장 적었다. 보광 적용 후에는 전반적으로 KNU 식물공장 단위유닛과 직사각형 식물공장이 양호한 냉난방 성능을 보여주었다. KNU 식물공장 창호의 면적이 와이드 스팬형보다 크기 때문에 건설비용의 증가가 예상되지만 회전형 스마트 조명 제어시스템을 적용하게 되면 재배면적을 넓히고 공간활용에 유리하다. 또한 LED 사용량을 줄일 수 있어 냉방부하와 보광에 드는 비용을 절감할 수 있다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.473-474
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• 2003

최근 수 십 년간 발전소의 연소효율은 급속히 향상되어왔으나 $CO_2$, NOx 등과 같은 온실 유해가스의 제어에 관한 심각한 문제점들을 직면한 상태이다. 발전공정에서 발생되는 온실 유해가스의 저감 방법으로 매체순환식 가스 연소발전 공정이 최근에 새로운 대안으로 제시되고 있다 그러나 매체순환식 가스연소시스템 내부의 bead상 매체입자들이 입자간 혹은 입자와 반응기 벽간의 충돌과 마찰에 의하여 마모가 되게 되고, 그 결과 원하지 않는 량의 마모입자가 배출가스와 함께 배출되게 된다. 세라믹 캔들필터는 고온고압 연소공정 등에서 배출되는 가스내의 입자상 오염물질을 회수 처리하는데 효과적인 장치로써 널리 개발되고 있다. (중략)

• Journal of Practical Agriculture & Fisheries Research
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• v.20 no.1
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• pp.55-66
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• 2018

Judicious control of high temperature is the most important task for the successful intensive-cultivation of vegetables in glasshouses during the hot summer. Estimation of cooling load and wise selection of suitable equipments and facilities based upon the environmental conditions are essential for the efficient temperature control. A series of experiments were carried out to investigate VETH(ventilation, evapotranspiration, temperature and humidity) plot was prepared for the possible practical application in designing some evaporated cooling methods for the following 9 locations; Seoul, Seosan, Taejeon, Pusan, Cheju, Kwangju, Taegu, Chonju, and Chinju.

• Journal of Bio-Environment Control
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• v.7 no.4
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• pp.283-289
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• 1998

The adaptability of an evaporative cooling system to hot summer climate in greenhouses was comprehensively judged by fuzzy theory, based on the 20 years(1975~1994) weather data of nine representative regions in Korea. As uses the evaporative cooling system for greenhouses during summer in Korea, the inside air temperature of most regions except the southwest coastal areas, the south coastal areas, and Cheju island can be basically controlled below 32.5$^{\circ}C$, and ventilating air can be cooled 5$^{\circ}C$ and more. The analyzed results in this paper are on the basis of good ventilation system. When the evaporative cooling system is applied, the ventilation system which has good air flow organization is needed. Although the summer climate in Korea is high temperature and humidity, evaporative cooling systems are suitable for farm buildings in most regions. This facts better meet the needs of cooling for greenhouse in summer and provides a scientific basis for spreading the evaporative cooling system It is proposed that the further research is needed about the application of evaporative cooling system to greenhouses.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.415-418
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• 2017

Recently, the demand for energy efficiency improvement technology through the connection of waste heat energy and SmartGrid has been increasing. Thus, investments for the cultivation of high value crops and produce is increasing through research aimed at synthetic technology in real-time utilization of smart farms and waste heat energy with the concept of using container greenhouses and plant factories. In this aspect, we have carried out research on a practical application technology that will help farmers to increase the economic effectiveness of LED based plant factories in terms of energy efficiency. This can provide opportunities to connect with the large scale automated smart farms in the future. In this study, we focused on the economic effectiveness of crop cultivation using cooling technology in a container greenhouse through waste heat energy. Hereafter, in order to further advance the technology of real-time monitoring/control of the absorption chiller which is used through the container greenhouses and waste heat energy by using IOT, we would like to propose research on new ideas of agricultural technology that can maximize the utility of cooling energy by operating a mobile gateway based on Raspberry PI.