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창호 에너지소비효율등급제에 따른 공동주택의 열성능 평가
임희원,김동윤,이수만,안정혁,윤종호,신우철 대한설비공학회 2018 설비공학 논문집 Vol.30 No.4
The Korean fenestration energy consumption efficiency rating system only considers thermal performance of the heat transfer coefficient (U-value) and airtightness excluding optical characteristics of the solar heat gain coefficient (SHGC). This study analyzed annual heating and cooling energy requirements on the middle floor of apartment by optical and thermal performance of windows to evaluate the suitability of the rating system. One hundred and twenty-eight windows were analyzed using THERM and WINDOW 7.4, and energy simulation for a reference model of an apartment house facing south was performed using TRNSYS 17. The results showed that window performance was the main factor in the heating and cooling load. The heating load of the reference model was 539 kWh to 2,022 kW, and the cooling load was 376 kWh to 1,443 kWh. The coefficient of determination (R2) of the heating and cooling loads driven from the SHGC were 0.7437 and 0.9869, which are more compatible than those from the U-value, 0.0558 and 0.4781. Therefore, it is not reasonable to evaluate the energy performance of windows using only the U-value, and the Korean fenestration energy consumption efficiency rating system requires a new evaluation standard, including SHGC.
임희원 한국헬스커뮤니케이션학회 2023 헬스커뮤니케이션연구 Vol.22 No.2
This study aimed to clarify the psychological mechanism by which individuals accept health misinformation from social media and how health misperceptions affect subsequent unhealthy behavior in the context of dewormer use. An online survey was conducted with 307 South Korean adults exposed to dewormer use information on social media. The positive association between the respondents’ uncertainty about their health and factual misbeliefs about dewormer use was moderated by their pre-existing attitude toward complementary and alternative medicine (CAM) vs. standard treatments, suggesting that individuals who are uncertain but more favorable toward CAM tend to accept factual misbeliefs more easily. Individuals’ uncertainty about their health and treatment for the health management was positively associated with conspiracy beliefs. Factual misbeliefs were the key mediator in the association between the interaction of uncertainty and pre-existing attitude toward CAM vs. standard treatments and dewormer-taking intention.
TRNSYS을 이용한 온실 적용 태양열 연계 지열히트펌프 융복합 난방시스템 열성능 해석
임희원,이왕제,신우철 대한설비공학회 2023 설비공학 논문집 Vol.35 No.6
In this study, we proposed a hybrid solar-assisted GSHP heating system with underground seasonal thermal energy storage and evaluated the thermal performance and dynamic operating characteristics of the greenhouse for apple mango with a total area of 2,300 m2. The heating load in winter was supplied by the solar thermal system, and the remaining load was met by the closed-loop vertical GSHP System. The surplus solar heat in the non-winter season was stored in underground storage, which compensated for the winter ground temperature drop. The system was mainly composed of four parts: an evacuated tube solar collector with a gross area of 380 m2, GSHP with a 210 kW heating capacity, a solar storage tank of 100 m3, and a cylinder-shaped borehole thermal energy storage system with a storage volume of 64,910 m3. TRNSYS 18 was used as the analysis tool, and the main results are summarized as follows. First, the peak heating load and total annual heating load of the greenhouse were 546 kW and 327 MWh, respectively. Second, the annual average collector efficiency was 49.5%, and the total annual useful heat gain was 227.5 MWh. Of this, 100 MWh was directly supplied for greenhouse heating, and the remaining 150 MWh was stored in underground storage. The solar fraction was found to be 30%. Third, the amount of heating supplied by the GSHP was 231.1 MWh, which was 70% of the total heating load. As a result, the renewable energy fraction reached 100%. Fourth, the heat storage efficiency of underground seasonal thermal energy storage by surplus solar heat was 70%. Even though the GSHP operated mainly on heating, the ground temperature did not fall.
기상청 개방형-API 기상정보 기반 중·소규모 태양광발전 성능평가 및 고장감지 원격모니터링시스템
임희원,김일권,신우철 한국태양에너지학회 2023 한국태양에너지학회 논문집 Vol.43 No.2
Small and medium-sized unmanaged grid-connected photovoltaic (PV) systems are difficult to manage owing to the installation costs of monitoring systems. Consequently, they can be left unattended for a long time following break downs. Thus, in this study, we developed a low-cost remote monitoring system for small-sized PV systems. The proposed monitoring system is equipped with a failure detection algorithm based on the simulation of an active system that accurately predicts the power output under normal operating conditions. Additionally, the monitoring system can recognize and notify a failure when the actual power generation is abnormally low. To lower the cost, we utilized SBC as a data server by edge computing and designed a monitoring system using the open-source software openHAB. Moreover, we used an open-API (ground weather observation data) provided by the Korea meteorological administration (KMA) to obtain hourly weather data (horizontal radiation, outdoor temperature, wind speed, etc.) for free to use in the simulation analysis. The Shewhart control chart was used as a benchmark for fault detection, where the ratio of the measured power generation to simulated generation was set as the observed value. From the verification test for actual grid-connected PV systems, it was confirmed that the monitoring system can effectively identify the occurrence of abnormal operating conditions, such as open-circuit, partial shading, etc.
공동주택에 적용된 PV/T 태양열 급탕시스템 연간 열 및 발전성능 분석
임희원(Lim Hee-Won),이왕제(Lee Wang-Je),윤종호(Yoon Jong-Ho),조성구(Cho Sung-Goo),백남춘(Baek Nam-Choon),신우철(Shin U-Cheul) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
A PV/T solar collector, wherein a photovoltaic module and a solar collector are combined into a single component, is considered to be highly reliable, durable, and economically feasible. Additionally, zero-energy buildings have recently drawn significant attention. In this study, the dynamic behavior and energy performance of a PV/T solar hot water system employed in a twenty-storey apartment were analyzed. The said system comprises three 25 EA (a total of 75 EA) PV/T solar collectors and a 15.6 ton storage tank. The TRNSYS 17 software was employed as a simulation tool for conducting the analysis, and the national reference standard weather data (TMY3) of Daejeon, South Korea was incorporated as meteorological data. The obtained results indicate that if the available space is limited and if the aspect of energy efficiency is considered, the usage of PV/T solar hot water systems that simultaneously produce thermal energy and electrical energy can be more advantageous than the usage of standard photovoltaic or solar hot water systems.
넷-제로에너지주택의 공기열원 히트펌프시스템 동적거동 및 에너지성능 분석
임희원(Lim Hee Won),김지현(Kim Ji Hyun),김일권(Kim Il Kwon),신우철(Shin U Cheul) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.6
Air-source heat pumps (ASHPs) have somewhat lower operating performance than groundsource heat pumps (GSHPs), but they have been reported to have low initial investment costs and a great energy-cost-saving effect due to the implementation of net-zero-energy houses. In this study, we analyzed the dynamic behavior and energy performance of equivalent ASHPs in existing low-energy houses installed with GSHPs of 9 kW using TRNSYS dynamic simulation. The house with a total floor area of 194 ㎡ was an all-electric house and domestic hot water, space heating, and cooling energy were supplied by the ASHP. To summarize the main results, first, the annual space heating and cooling energy supply of the ASHPs was 7,698 kWh and 2,226 kWh, respectively, and the annual heating COP and cooling EER were 3.4 and 3.1, respectively. Second, the total annual power consumption of the proposed model with ASHPs was 8,218 kWh and the annual power generation of the 6 kWp PV system was 8,682 kWh, which generated a surplus of 464 kWh, achieving net-zero energy. Third, the total annual electricity charge was 249,000 generated by ASHPs (proposal model) connected to the “residential service” grid of KEPCO, which was reduced by approximately 66% compared to the 736,000 generated by the GSHPs (existing model) linked to a “general service” grid.