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문종필,강금춘,김형권,이태석,오성식,진병옥,Moon, Jong Pil,Kang, Geum Choon,Kim, Hyung Gweon,Lee, Tae Seok,Oh, Sung Sik,Jin, Byung Ok 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6
In this study, a cold well and a warm one with the distance of 100 m were installed in the alluvial aquifer. Groundwater used as the heat and the cold source of heat pump was designed to flow into the warm and the cold well with a diameter of 200 mm. In order to increase the heat and cold storage in aquifer, six auxiliary wells with the diameter of 50 mm and the depth of 30 m were installed at an interval of 5 m from the main well. Also, heat pump 50 RT, the thermal tank $40m^3$, and a remote control and monitoring system were installed in three single-span greenhouses ($2,100m^2$) for growing tomato in Buyeo, Chungcheongnam-do. According to the aquifer heat storage test which had been conducted from Aug. 31 to Sep. 22, 2016, warm water of $850m^3$ was found to flow into warm well. The temperature of the injected water was $30^{\circ}C$ (intake temperature : $15^{\circ}C$), and the heat of 12.8 Gcal was stored. The greenhouse heating test in winter had been conducted from Nov. 21, 2016 to Apr. 30, 2017. On Nov. 21, 2016 when heating greenhouse started, the aquifer temperature of the warm well was $18.5^{\circ}C$. The COP for heating with water source at $18.5^{\circ}C$ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of $15^{\circ}C$ on Jan. 2, 2017 and the heat pump COP was measured to be 3.2 at that time. As a result, the heat pump COP was improved by 18 %. and retrieval heat was 8 Gcal, the retrieval rate of heat stored in aquifer was estimated at 63 %.
CFD를 이용한 단일 구획 공간에서의 연기와 CO 확산 시뮬레이션
손윤석(Son, Yoon-Suk),김형권(Kim, Hyeong-Gweon),오형식(Oh, Hyung-Sik),김태옥(Kim, Tae-Ok),신동일(Shin, Dong-Il) 한국화재소방학회 2008 한국화재소방학회 학술대회 논문집 Vol.2008 No.춘계
In this study, the Computational Fluid Dynamics (CFD) has been used to analyze the smoke movement and the carbon monoxide concentration distribution, both vertically and longitudinally, in a compartment, based on conservation laws. The Fire Dynamics Simulator (FDS) developed by National Institute of Standards and Technology (NIST) was used for numerical simulations using Reynolds averaged Navier-Stokes equations (RANS) model to solve for time-averaged properties. Results show, as a function of time, a detailed distribution of temperature and carbon monoxide concentration changing against the height above the floor and those changes alongside the distance away from the fire source. Fire-induced smoke and toxic gases like CO are more dangerous in a confined space. The result of study may contribute in designing the smoke evacuation system based on the precise tenable condition.
진공증착법을 이용한 최적의 압전성 유기 박막의 제조와 스위치 특성에 관한 연구
박수홍(Su-Hong Park),이선우(Sun-Woo Lee),김형권(Hyung-Gweon Kim),정무영(Mu-Young Jung),임응춘(Eung-Choon Lim),김수정(Su-Jung Kim),이희규(Hee-Kyu Lee),이덕출(Duck-Chool Lee) 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.3(1)
본 논문에서는 진공증착법으로 β형 PVDF 유기 박막의 자세한 제조 방법과 압전 특성을 연구하였다. 증착 공정중에 인가 전계와 기판 온도의 적용에 의해서 결정의 분자 배향을 통한 증착 유기 박막을 제조하였다. 진공증착법에 의하여 β-PVDF 유기 박막을 제조 할 때 기판 온도를 80℃로 유지시키고, 인가 전계를 142.8㎸/㎝로 유지시킬 때 최적의 제조 조건임을 제시하였다. 스위치 특성의 경우, 전압 출력 계수는 힘 모우멘트의 증가에 따라 1.39에서 7.04 V로 증가하였다. In this paper studied was the piezoelectric properties of the β-PVDF organic thin films prepared by physical vapour deposition method. The molecular orientation of organic thin films was controlled by the application of an electric field and variation of substrate temperature during the evaporation process. Optimum conditions of manufacturing β-PVDF organic thin film by physical vapor deposition method is to keep at the substrate temperature of 80℃, at the applied electric field of 142.8㎸/㎝. The voltage output coefficient increased from 1.39 to 7.04V increasing the force moment.
시설원예용 지열 및 태양열 이용 하이브리드 히트펌프 시스템의 난방성능에 관한 연구
전종길(Jeon Jong Gil),이동건(Lee Dong Geon),백이(Paek Yee),김형권(Kim Hyung Gweon) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.5
In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by 23℃. Field performance test results showed that average heating coefficient of performance (COPh) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance (COPh) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.
파프리카 재배 벤로형 유리온실에서 난방에너지 절감 패키지 기술 적용효과
권진경(Jin Kyung Kwon),전종길(Jong Gil Jeon),김승희(Seung Hee Kim),김형권(Hyung Gweon Kim) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.4
본 연구에서는 유리온실 경영비 절감을 위한 고효율 난방기술을 개발하기 위하여 지하수열원 히트펌프, 알루미늄 다겹보온커튼, 근권부 국소난방장치를 조합한 난방패키지 모델을 구성하고 파프리카 재배 벤로형 유리온실에 적용 시험을 수행하였다. 적용효과 분석을 위하여 관행 경유온수보일러와 일반 보온커튼을 설치한 대조구 온실과 비교시험을 통해 온실환경, 난방비용, 작물생육 등을 검토하였다. 알루미늄 다겹보온커튼과 일반 부직포 보온커튼을 설치한 온실에 대한 무가온 조건에서의 야간온도 비교시험에서 알루미늄 다겹보온커튼 설치 온실의 온도가 일반 부직포 보온커튼 설치 온실에 비해 평균 2.2℃ 더 높게 유지됨을 확인하였다. 또한 근권부 국소난방장치를 설치한 온실에서 미설치 온실에 비해 야간난방 중의 베드내부 근권온도가 4.7℃ 더 높게 유지됨을 확인하였다. 난방패키지를 구성하는 지하수열원 히트펌프의 난방성능을 분석한 결과 지하수를 직접 열원으로 이용하는 시스템 특성상 난방성능계수는 평균 3.7로 비교적 높게 나타났다. 난방패키지를 적용한 처리구 온실과 관행 난방의 대조구 온실에 대하여 연료소비량을 계측한 결과 10a(1,000㎡)당 대조구 온실은 경유 14,071L, 전력 364㎾h를 소비하였고, 처리구는 전력 35,082㎾h를 소비하여 난방비용 기준으로 대조구 온실의 비용 절감율은 87%로 나타났다. 처리구 및 대조구 온실의 작물생육을 비교한 결과 초장과 엽록소 함량에서 차이가 발생하였으나 두 온실의 난방온도가 거의 동일하므로 전체적인 생육은 큰 차이가 없는 것으로 분석되었다. 원예시설의 난방에너지 절감효과를 극대화하기 위해서는 본 연구의 난방패키지를 구성하는 개별 기술뿐 아니라 이미 개발된 고효율 공조기 이용기술, 보온성 향상기술, 온도관리 기술 등을 지역, 시설, 작목, 작형 등에 최적화하여 조합할 수 있는 추가적 패키지 모델의 개발 연구가 필요한 것으로 판단되었다. Glasshouse heating package technologies to improve energy usage efficiency in winter were developed. Heating package was composed of the ground water source heat pump with heating capacity of 105㎾, the aluminum multi-layer thermal curtain with six layers of different materials and the root zone local heater with XL pipes of φ 20㎜. Venlo type glasshouse(461㎡) with the heating package was compared with the same type and area control glasshouse with the light oil boiler, the usual non-woven fabric thermal curtain with respect to the glasshouse inside temperature, relative humidity, crop growth, and heating energy consumption. The results of test in paprika cultivation glasshouses showed that the air temperature inside glasshouse with aluminum multi-layer thermal curtain was maintained 2.2℃ higher than that of control glasshouse in un-heating night time and the temperature in bed with root zone local heating was 4.7℃ higher than that in bed without local heating. Average heating coefficient of performance(COP) of the ground water source heat pump used in paprika cultivation was 3.7 and the glasshouse inside temperature was maintained at 21℃ of heating set up temperature. The heating energy consumptions per 10a were measured at 14,071L of light oil and 364㎾h of electric power for the control glasshouse and 35,082㎾h for the glasshouse applied heating package. As results, the heating cost of the glasshouse applied heating package was 87 percent lower than that of control glasshouse. The growths of paprika in glasshouses of control and applied heating package did not show any significant difference.