난방용 전열기의 온도 및 단계 설정방법에 따른 전력소비패턴 분석

엄지영(Ji Young Eum),김원욱(Won Uk Kim),김용기(Yong Ki Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11

Increased power consumption due to the heat waves and cold waves caused by climate change puts an economic burden on households. In December 2016, the government reduced the progressive rate scheme of residential electricity from 6 stage to 3 stage and revised its progressive rate from 11.7 times to 3 times. The power consumption of residential buildings increases in winter season due to the use of electric heaters. In particular, the use of electric heating mattresses and blankets in 2013 has doubled compared to 2000. Therefore, it is necessary to develop energy saving technologies for electric heaters that generate power peaks in winter season. In this study, the power consumption pattern according to the temperature and step setting method of electric heaters(hot-water mattress, electric heated blanket, convection heater, electric radiator) was analyzed through instantaneous power measurement in the laboratory. As a result, the method of controlling the amount of heat in electric heaters is controlled by reference to the step setting, the hot water temperature or the temperature inside the heater, but it is necessary to perform more precise control for a comfortable indoor air conditioning.

공동주택 발코니 PV 연계 가정용 BESS의 HOMER를 이용한 경제성 분석

엄지영(Eum Ji-Young),김용기(Kim Yong-Ki) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.6

The Seoul metropolitan area and many local governments are supporting a project that involves installing and using PV (Photovoltaic) modules on the balconies of apartment houses in Korea. The power capacity of the installed PV is generally 300 W (a single PV module) per household. If the power capacity of the PV module is larger than the peak load of the household during the PV generation time, the surplus power cannot be utilized. Therefore, the necessity of a battery energy storage system (BESS) that can utilize the PV surplus power is being increasingly felt. In this study, we analyzed the economic efficiency of the residential BESS connected to a balcony-PV using HOMER (Hybrid Optimization of Multiple Energy Resources) software in Korea. The simulation was conducted for five cases in which the price of each component of BESS with balcony-PV and the limit installation capacity of the PV module were variable. As a result, when the balcony-PV and residential BESS were 50% (915,000 won) lower than the current price (1,830,000 won) and a PV with a power capacity of 1.2 kW was installed, the electric power charge was reduced by 34.2% (NPC 10,207,600 won) and the payback period required 4.09 years compared with the pre-installation times (NPC 15,519,570 won).

건물형 태양광 모듈의 외장재 일체화 방안 연구

엄지영(Eum, Ji-Young),박승환(Park, Seung-Hwan),최현중(Choi, Hyun-Jung) 대한건축학회 2023 대한건축학회 학술발표대회 논문집 Vol.43 No.1

기상정보를 활용한 도시규모-EMS용 태양광 발전량 예측모델

엄지영(Ji-Young Eum),최형진(Hyeong-Jin Choi),조수환(Soo-Hwan Cho) 대한전기학회 2015 전기학회논문지 Vol.64 No.3

City or Community-scale Energy Management System(CEMS) is used to reduce the total energy consumed in the city by arranging the energy resources efficiently at the planning stage and controlling them economically at the operating stage. Of the operational functions of the CEMS, generation forecasting of renewable energy resources is an essential feature for the effective supply scheduling. This is because it can develop daily operating schedules of controllable generators in the city (e.g. diesel turbine, micro-gas turbine, ESS, CHP and so on) in order to minimize the inflow of the external power supply system, considering the amount of power generated by the uncontrollable renewable energy resources. This paper is written to introduce numerical models for photo-voltaic power generation prediction based on the weather forecasting information. Unlike the conventional methods using the average radiation or average utilization rate, the proposed models are developed for CEMS applications using the realtime weather forecast information provided by the National Weather Service.

HOMER를 이용한 PV 연계 가정용 ESS의 경제성 분석

엄지영(Ji-Young Eum),김용기(Yong-Ki Kim) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.2

유럽과 북미에서는 건물 에너지를 효율적으로 관리할 수 있는 가정용 에너지저장시스템(ESS)에 주목하고 있다. ESS는 배터리의 충전 및 방전을 통해 전력량을 저장 및 관리하는 시스템이다. ESS는 주파수 조정용, 신재생에너지 연계용 및 피크 저감을 위한 건물용으로 사용된다. PV 연계형 ESS는 발전 시간대의 부하에 공급하고 남은 PV 발전량을 저장하여 비발전 시간대의 부하에 공급함으로써 신재생 발전출력의 안정화를 기할 수 있다. 국내에서의 ESS 시장은 주파수 조정용, 신재생 발전출력 안정용 및 건물용으로 보급되고 있으나, 가정용 ESS는 시장이 아직까지는 형성되지 않고 있다. 낮은 전기요금, 가정용 누진요금체계 및 ESS의 높은 가격 때문인 것으로 판단된다. 따라서 본 논문에서는 가정용 ESS의 보급방안을 검토하고자, HOMER를 이용하여 가정용 전기요금, 가정용 ESS 가격, PV 모듈 가격을 변수로 국내 공동주택 세대 단위에서 활용할 수 있는 PV연계 가정용 ESS의 경제성을 분석하고자 한다. 분석결과, 현재 가격 조건에서는 PV 연계 ESS를 설치하는 것보다 저렴한 계통전기를 사용하는 것이 경제적이므로 보조금 없이 ESS를 활용하기에는 어렵다. 공동주택용 ESS의 시장은 세대 PV 발전용량이 증가해야 하며, 소용량의 ESS가 개발되어야만, 시장이 열릴 것으로 판단된다. Europe and North America are paying attention to residential ESS(Energy Storage System) that can manage energy efficiently. The ESS is a system that stores and manages the electric power by charging and discharging the battery. The ESS is generally used in conjunction with photovoltaic systems. The ESS supplies the load of the power generation time and stores the remaining PV power to supply the load at the non-power generation time. However, due to the high price of residential ESS, low electric rates and increasing block rates, there is no market of residential ESS in Korea. This paper reviews the price condition and the capacity for applying PV and residential ESS to household of apartments using HOMER in Korea.

도시 건물의 전력수요패턴 분석을 위한 수학적 예측모델 개발

엄지영(Ji-Young Eum),조수환(Soo-Hwan Cho),박시삼(Si-Sam Park),김용기(Yong-Ki Kim) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.4

I-V 곡선을 활용한 PV모듈 고장유형의 분류 방법

엄지영(Ji-Young Eum),김용기(Yong-Ki Kim),조수환(Soo-Hwan Cho) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.10

As an alternative to increase the energy independence rate of zero-energy buildings, maintenance is gaining attention as the use of the photovoltaic power system has increased. In particular, research is focused on PV module failure. The failure classification method of the PV module includes visual inspection, image analysis, and data analysis. In this paper, two methods of classifying failure types based on the I-V curve among data analysis methods are introduced. The first method is a statistical method using I-V curve data such as short-circuit current and open voltage for each failure type, and the second method is a vector analysis method using the electric distance of the I-V curve. And the vector analysis method was analyzed through MATLAB simulation based on the equation of I-V curve for each failure type.

TRNSYS를 이용한 단독주택용 연료전지 시스템의 용량설계 및 운전방안 검토

엄지영(Ji Young Eum),김용기(Yong Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

To respond to the global climate crisis, the Korean government is proposing the use of a fuel cell system that does not emit additional carbon as a means of reducing greenhouse gas in the building sector. Considering the spread of the residential fuel cell system, it is necessary to review the appropriate capacity and operation of the fuel cell system to reduce building energy. In this study, the capacity design and operation plan of the fuel cell system were reviewed for detached house using the TRNSYS (TRaNsient System Simulation) program. The energy load is divided into cooling, heating, hot water and electricity. It was designed that the cooling load and electric load use electricity, and the heating load and hot water load use heat. As a result of examining the new & renewable energy self-sufficiency rate using the fuel cell system as a variable for the capacity, the 1 kW capacity was 79.1% electricity and 101.6% heat.

TRNSYS를 이용한 단독주택용 연료전지 시스템의 용량설계 및 운전방안 검토

엄지영(Ji Young Eum),김용기(Yong Ki Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

To respond to the global climate crisis, the Korean government is proposing the use of a fuel cell system that does not emit additional carbon as a means of reducing greenhouse gas in the building sector. Considering the spread of the residential fuel cell system, it is necessary to review the appropriate capacity and operation of the fuel cell system to reduce building energy. In this study, the capacity design and operation plan of the fuel cell system were reviewed for detached house using the TRNSYS (TRaNsient System Simulation) program. The energy load is divided into cooling, heating, hot water and electricity. It was designed that the cooling load and electric load use electricity, and the heating load and hot water load use heat. As a result of examining the new & renewable energy self-sufficiency rate using the fuel cell system as a variable for the capacity, the 1 kW capacity was 79.1% electricity and 101.6% heat.

공동주택관리정보시스템과 원격검침시스템 데이터를 이용한 지역난방방식 공동주택에서의 에너지원별 소비패턴 분석

엄지영(Ji-Young Eum),김원욱(Won-Uk Kim),김용기(Yong-Ki Kim) 한국퍼실리티매니지먼트학회 2018 한국퍼실리티매니지먼트학회지 Vol.13 No.1

The world is currently facing energy and environmental problems. Building sector is accounting for 22 % of the total energy use in Korea. Also, apartment houses account for 45 % of the total energy use in residential buildings. Five utilities that is causing energy consumption in the residential building are electricity, heating, hot water, water, and city gas. In this study, the annual and daily consumption patterns of five utilities were analyzed using the management cost data of K-apt(apartment housing management information system) and AMR(Automatic Meter Reading) data of a A-apartment in Suwon. According to K-apt’s data, the average annual utility fee of 60 apartment complexes that use district heating system is the order of electricity bill > heating bill > hot water bill > water bill, except for city gas for cooking. As a result of analyzing the electricity consumption of a A-apartment located in Suwon city, the base load which is always consumed regardless of whether the resident is active or not is more than 65% of total daily electricity consumption. Therefore, it is very necessary to reduce the base load in order to reduce electricity consumption in apartment houses.