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PVT 패널의 운전조건에 따른 시스템적 성능에 관한 실험적 연구
이근휘(Keunhui Lee),곽재호(Jaeho Kwak) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
태양광열(PVT) 패널은 태양전지(PV) 패널과 집열기(Collector)를 일체화하여 PV패널로부터 전력과 집열기로부터 열을 동시에 생산하는 장치이다. 본 연구에서는 PV에 접착하거나 PV와 일체형으로 제작하지 않고 PV에 탈부착(Add-on) 할 수 있도록 제작한 폴리머 집열기가 적용된 PVT 패널을 사용하였다. PVT 패널의 시스템적 성능을 평가하기 위해 실증 건물에 급탕예열시스템을 설치하여 PVT 패널에서 생산된 열로 급탕예열을 하게 하면서 집열기내 순환유량에 따른 PVT의 열효율과 여름철 기존 PV 대비 전력효율 상승효과를 평가하였으며 동시에 여름철 집열기 과열문제의 발생 유무를 관찰하였다.
김덕진,이근휘 대한설비공학회 2004 설비공학 논문집 Vol.16 No.7
The cost accounting of products on energy system is important for evaluating the economical efficiency and deciding the reasonable sale price. In the present, the suggested OECOPC method was applied to a combined cycle cogeneration, and each unit cost of electricity and heat products was calculated. In addition, the previous thermoeconomic methods were applied and calculated to equal system. As a result of comparing various methods, the unit costs by OECOPC method were calculated in the middle value of those. This result tells that OECOPC methods are most moderate. The suggested OECOPC method can apply any energy system. Hence this method is expected to make contribution to cost accounting on energy system.
유호선,이근휘,방보청 대한설비공학회 1999 설비공학 논문집 Vol.11 No.2
Based on a set of performance plots relating the design variables to the imposed conditions, an easy-to-use and versatile design procedure for chevron-type multipass plate heat exchangers is developed. In order for the present procedure to cover multipass with unequal passes and non-unity ratio of heat capacity rate, each stream number of transfer unit is adopted as the basic design variable instead of the exchanger number of transfer unit. It is found that there exists a unique relation between the stream and exchanger number of transfer units regardless of the chevron angle and the plate length. In addition, for a given value of the pressure drop the heat transfer area per unit mass flow rate can be expressed in terms of the stream number of transfer unit only. These two relationships in the form of simple plots constitute the framework of design. The sample results in comparison with the available data indicate that the present procedure includes the previous ones as a subset, and that every design method is affected essentially by the selection of specific correlations for the heat transfer coefficient and the friction factor.
김덕진,이근휘 대한설비공학회 2005 설비공학 논문집 Vol.17 No.6
The cost accounting of electricity and heat produced from an energy system is important in evaluating the economical efficiency and deciding the reasonable sale price. The OECOPC method, suggested by the author, was applied to a 650 MW combined cycle cogeneration system having 4 operating modes, and each unit cost of electricity and heat products was calculated. In case that a fuel cost is ₩400/kg and there are no direct and indirect cost, they were calculated as follows; electricity cost of ₩23,700/GJ at gas-turbine mode, electricity cost of ₩15,890/GJ at combined cycle mode, electricity cost of ₩14,146/GJ and heat cost of ₩6,466/GJ at cogeneration mode, and electricity cost of ₩14,387/GJ and heat cost of ₩4,421/GJ at combined cycle cogeneration mode. Further, these unit costs are applied to account benefit on this system. Since the suggested OECOPC method can be applied to any energy system, it is expected to contribute to cost accounting of various energy systems.
태양광열(PVT) 융합패널과 계간축열 및 지열히트펌프를 활용한 신재생 융복합 열에너지 공급시스템
류경호(Kyung Ho Ryu),이근휘(Keun Hui Lee) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
하절기 활용도가 매우 낮은 태양열을 저장하여 동절기 난방에 사용하기 위한 계간축열(Seasonal Thermal Energy Storage)기술을 적용하되 태양열 집열기 대신 전기와 열을 동시에 생산하는 태양광열(PVT) 융합패널을 이용하여 태양열을 모아서 저장하는데 이때 저장한 열은 30℃ 정도의 비교적 저온이기 때문에 지열히트펌프(GSHP)의 열원으로 이용함으로써 단순 지열히트펌프보다 높은 계절난방성능지표(SCOP)를 달성하면서도 계절냉방성능지표(SEER)의 저하를 최소화하면서 건물의 냉난방 열에너지를 공급할 수 있는 시스템을 구축하였다.
폴리머 집열기가 적용된 PVT 패널의 국내 적용을 위한 열성능 실험연구
곽재호(Jae Ho Kwak),이근휘(Keun Hui Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
태양광열(PVT) 패널은 태양전지(PV) 패널과 집열기(Collector)를 일체화하여 PV 패널로부터의 전력과 집열기로부터의 열을 동시에 생산하는 장치이다. 본 연구에서는 폴리머 집열기가 적용된 PVT 패널의 국내 적용을 위한 선행연구로 현장실증 성능평가를 수행하였다. 폴리머 집열기가 적용된 PVT 패널의 전력과 열 생산량 및 효율을 측정하는 한편 풍속에 따른 PVT 패널의 효율 변화를 분석하였다. 겨울철은 폴리머 집열기내의 순환유량은 6.7 LPM, 출수온도는 4.0~18.0℃, 외기온도는 0.7~3.4℃에서 운전되었다. 여름철은 폴리머 집열기내의 순환유량은 1.0 LPM이며, 출수온도는 18.7~41.0℃이며, 외기온도는 18.7~29.8℃에서 운전되었다. 겨울철, 여름철 모두 풍속이 작을수록 폴리머 집열기 성능은 제조사에서 제공하는 효율식과 비슷한 경향을 보였으나, 풍속이 클수록 폴리머 집열기 성능은 제조사에서 제공하는 효율식과 차이를 보인다. 겨울철 PV 패널의 전력효율은 평균 15.7%이며, 집열기의 열효율은 최대 41.9%이며 평균 30.1%이다. 바람속도가 증가할수록 효율은 감소하는 경향을 보였다. 여름철 PV 패널의 전력효율은 14.5%이며, 집열기의 열효율은 최대 17.5%이며 평균 10.5%이다. 바람속도에 따른 효율변화는 거의 없었다. 겨울철과 여름철의 성능이 차이가 나는 것은 집열기내 순환 유량이 1.0LPM으로 겨울철 유량 6.7LPM보다 작은 영향으로 생각된다.
변유량 펌프시스템에서 차압센서 위치에 따른 에너지 절감량 비교실험
경도현(Doheon Kyung),이근휘(Keunhui Lee),권정태(Jeong-Tae Kwon),유호선(Hoseon Yoo),임신영(Shinyoung Im),홍영기(Youngki Hong) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
In case of Central heating facility like as Distric heating user’s facility, Variable speed drives are commonly used to control the speed of pumps. The use of variable speed controlled pumps instead of valve adjustment like as DPV has shown to reduce the energy consumption of pumps. but if the idea to control speed of pumps isn’t effective operation, the expansive variable speed drives cannot reduce electric energy cost. In this study the actual energy consumption of heating circulation pump with different installation position of differential pressure transmitters are compared. A variable speed control using differential pressure at the long-distance building and that at the facility room was applied to experimental field. From the experimental results, it was concluded that by using the variable speed control with the long-distance building △p setting(0.6bar), the energy consumption was reduced by up to 72.6% in comparison of constant speed control. On the other hand it was concluded that by using the variable speed control with the facility room △p setting(0.8bar), the energy consumption was reduced by up to 59.5% in comparison of constant speed control. Therefore, the variable speed control using the differential pressure at the long-distance building is recommendable.
김현수(Hyun-Soo Kim),이근휘(Keun-Hwi Lee),박형준(Hyoung-Joon Park),이세민(Se-Min Lee) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The "FX-System" is a proportional controlled expansion tank with control valve in heating and cooling application. The expansion water being separated from the air means that the water does not come in contact with atmospheric oxygen and that the risk of corrosion due to oxygen in the installation is eliminated. This paper presents the advanced control method of expansion water in heating and cooling system. The advanced control method controlled expansion valve by proportional(PID) control to keep system pressure. This paper described to valve selection and test of control valve of expansion water. The development of advanced expansion tank with proportional(PID) control makes energy saving and life increasing for equipments in thermal system