Development of Environmental Control System for High-Quality Shiitake Mushroom (Lentinus edodes (Berk.) Sing.) Production

권진경,김승희,전종길,강용구,장갑열 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.4

Purpose: Recently, an increasing number of farms have been cultivating shiitake mushrooms using a sawdust substrate and a cooler/heater. In this study, an attempt was made to develop an environmental control system using a heat pump for cultivating high-quality shiitake mushrooms. Methods: An environmental control system, consisting of an air-to-water type heat pump, a thermal storage tank, and a radiator in a variable opening chamber, was designed and fabricated. The system was also installed in the cultivation facility of a farm cultivating shiitake mushrooms so as to compare the proposed control system with a conventional environmental control system using a cooler-condensing unit and an electric hot water boiler. Results: The uniformity of the environment was analyzed through environment measurements taken at several positions inside the cultivation facility. It was determined that the developed environmental control system is able to control the variations in temperature and relative humidity to within 1% and 3%, respectively. In addition, a maximum temperature difference of 30°C (maximum of 35°C, minimum of 5°C) and a maximum relative humidity difference of 30% (maximum of 90%, minimum of 60%) can be attained within 30 min inside the cultivation facility through the cooling of the heat pump and heating of the radiator in a variable opening chamber. Thus, the developed control system can be used to cultivate high-quality shiitake mushrooms more effectively than a conventional cooler and heater. Conclusions: In comparison with a conventional environmental control system, the developed system decreased the yield of ordinary mushrooms by 65%, and increased that of high-quality mushrooms by 217%. This corresponds to a 16% increase in gross farm income. Consequently, the developed system is expected to improve the income of shiitake mushroom cultivating farms.

〈도시 목격자〉, 〈끝나지 않은 편지〉

권진경 한국독립영화협회 2019 독립영화 Vol.- No.48

Gold, Silver, and QDs Nanoparticles with Chitosan for Bio-applications

권진경,강익중 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.1

Synthesis and characterization of strongly luminescing quantum dot-capped chitosan nanocrystals

권진경,강익중 한국공업화학회 2008 한국공업화학회 연구논문 초록집 Vol.2008 No.-

신생검후 동정맥루의 자연경과

권진경,이태희,장국진,박성배,김현철,손철호 대한신장학회 1997 춘계학술대회 초록집 Vol.1997 No.-

Long-term Clinical Outcomes of Allograft Survival in Deceased Donor Kidney Transplantation

권진경,박우영,백진혁,박성배,한승엽,진규복 대한내과학회 2018 대한내과학회 추계학술대회 Vol.2018 No.1

반월상 사구체신염의 임상적 고찰

권진경,이태희,서상혁,박성배,김현철,박관규 대한신장학회 1997 춘계학술대회 초록집 Vol.1997 No.-

온실 내 잉여 태양열을 이용한 공기열원 히트펌프 성능향상

권진경,강금춘,문종필,강연구,김충길,이수장 (사) 한국생물환경조절학회 2013 생물환경조절학회지 Vol.22 No.4

A greenhouse heating system to improve heat pump performance using inside and outside air of greenhouse as a heat source selectively and cut CO2 enrichment costs by delay of greenhouse ventilation was developed. In this system, thermal storage modes divided into inside circulation mode using surplus solar energy and outside circulation mode using outside air heat. The thermal storage modes were designed to be switched mutually according to inside greenhouse temperature and six temperature values were input to control the heat pump operating, thermal storage mode switching and greenhouse heating automatically. Operating characteristics of this system were tested in a plastic greenhouse of non-ventilation condition. The results of test showed that the inside circulation mode began at about 11:00 and lasted for about 210 minutes and inside greenhouse temperature was maintained between 20~28℃ in spite of non-ventilation. System heating COP of the inside circulation mode in the daytime was 3.35, which was 36% and 25% higher than that of the outside circulation modes in the nighttime and daytime respectively. 본 연구에서는 온실 내부의 태양 잉여열과 외부의 공기열을 선택적으로 열원으로 이용함으로써 히트펌프의성능을 향상시키고, 온실의 환기 지연을 통해 이산화탄소 시용비용을 절감할 수 있는 온실 공조시스템을 개발하고자 하였다. 본 시스템의 축열 과정은 태양 잉여열을이용하는 내부순환모드와 외기열을 이용하는 외부순환모드가 온실 내부온도에 따라 자동으로 절환되도록 구성하였으며, 히트펌프 가동, 축열모드 절환, 난방 가동을 위한 6개의 온도값을 입력함으로써 축열과 난방이 자동으로 수행되도록 설계하였다. 단동온실을 대상으로 무환기조건에서 기초시험을 수행한 결과, 태양 잉여열을 이용한 축열은 약 11시부터 시작되어 평균 3시간 30분 정도유지되었으며, 주간의 온실 내부온도는 환기를 수행하지않음에도 대부분 약 20~28℃ 범위를 유지하였다. 주간내부순환모드에서 시스템의 난방성능계수는 약 3.35로야간 외부순환모드의 2.46 및 주간 외부순환모드의 2.67에 비해 각각 36% 및 25% 향상됨을 확인하였다. 본 시스템의 개선사항으로 태양 잉여열의 효율적 이용을 위해축열조 관리온도를 상승시킬 수 있는 고효율 히트펌프의적용이 필요하며, 온실의 무환기 운용에 따른 과습환경의 조성을 방지하고 태양 잉여열 수준이 높은 시기에온실의 온도상승을 방지하기 위해 강제환기를 운전모드에 추가할 필요가 있는 것으로 판단되었다.

Development of On-site Heat Loss Audit and Energy Consulting System for Greenhouse

권진경,강금춘,이성현,성제훈,윤남규,문종필,이수장 한국농업기계학회 2013 바이오시스템공학 Vol.38 No.4

Purpose: Greenhouses for a protected horticulture covered with a plastic or glass are easy to have weakness in a heat loss by deterioration, damage, poor construction, and so on. To grasp the vulnerable points of heat loss of the greenhouses is important for heating energy saving. In this study, an on-site heat loss audit and energy consulting system were developed for an efficient energy usage of a greenhouse. Method: Developed system was mounted with infrared thermal and visual cameras to grasp the heat loss from the greenhouse quickly and exactly, and a trial calculation program of heating load of greenhouse to provide farmers with the information of heating energy usage. Results: Developed system could print out the reports about the locations and causes of the heat losses and improvement methods made up by an operator. The mounted trial calculation program could print out the information of the period heating load and fuel cost according to the conditions of greenhouse and cultivation. The program also mounted the databases of the information on the 13 horticultural energy saving technologies developed by the Korea Rural Development Administration and simple economic analysis sub-program to predict the payback period of the technologies. Conclusion: The developed system was expected to be used as the basic equipment for an instructors of district Agricultural Technology and Extension Centers to conduct the energy consulting service for the farmers within the jurisdiction.

양방향 버스정보 시스템을 활용한 버스정류장 대기공간 설치 기준 개선방안 연구

권진경,김경석 국토연구원 2015 국토연구 Vol.86 No.-

This study was started to make people to identify the importance of preventing accident due to crowded bus station in aspect of urban space use and provide bus information service as much as possible to customer in space of shelter. Primary purpose of this study is to prove status of shelter use and change of service level through duplex bus information providing service and improve crowdedness for passenger through changed service level. Especially it has suggested the necessity to decide the size of shelter reasonably and its methodology and verified it through analysis of instances. It verifies reduction in the number of those waiting when bilateral bus information is provided than when unilateral bus information is and it shows all the shelter service levels, once very low due to the unilateral provision of information, get improved up to a level over ‘C’ without physically expanding space. In this process, it conducted research on bus users’ intention through a survey and frequency event sampling method and its result is applied to the process of calculating shelter scale. Besides, it presents an improvement plan for design criteria so that design criteria for shelters(decision of scale), which are not standardized yet, may be reasonably decided in consideration of users’ demand and shelter environments. 본 논문은 도시공간 이용 측면에서 정류장의 혼잡함으로 인한 사고방지를 중요하게 느끼고 이로 인해 부족한 쉘터 공간에서 보다 많은 이용자에게 최대한의 버스정보 서비스를 제공하고자 하는 데서 시작되었다. 본 논문은 양방향 버스정보 제공을 통해 쉘터 이용행태와 서비스 수준의 변화를 증명하고, 변화된 서비스 수준을 통해 승객들의 혼잡함 개선이 연구의 주 목적이다. 특히, 쉘터의 규모가 합리적으로 결정되어야 할 필요성을 제시하고, 그 방법론을 사례분석을 통해 제시하고 검증하였다. 단방향 버스정보 제공 때보다 양방향 버스정보 제공이 이루어질 경우, 쉘터 내에 잔류하는 대기인원이 감소하는 것을 검증하였고, 그로 인해 공간 부족으로 매우 낮았던 쉘터 서비스 수준이 물리적인 공간 확장 없이 모두 C 이상의 양호한 수준으로 개선되는 것을 보여주었다. 이 과정에서 설문조사와 빈도식사건표집법을 활용한 현장조사 등을 통해 버스이용객의 의향조사를 시행하였으며 그 결과를 쉘터 규모 산정 과정에 적용하였다. 또한 아직 표준화되지 못한 쉘터의 설계 기준(규모 결정)을 이용객 수요와 쉘터 환경을 고려하여 합리적으로 결정할 수 있도록 설계 기준 개선방안을 제시하였다.