• Research Article

    A Study on the PIM Library Creation Method for the Establishment of Open BIPV Design Environment

    개방형 BIPV 설계 환경구축을 위한 PIM 라이브러리 작성 방법에 대한 연구

    Choi Kyuhyeok, Jeon Hyunwoo, Ryu Euihwan, Park Kyungdo

    최규혁, 전현우, 류의환, 박경도

    In this study, module information was first analyzed in a building-type solar power system among new and renewable energy facilities that are … + READ MORE
    In this study, module information was first analyzed in a building-type solar power system among new and renewable energy facilities that are increasing in demand as the target of zero-energy buildings expands. In addition, the method of writing BIM data in Revit for applying BIPV to zero-energy buildings according to the mandatory BIM was analyzed. The openness of the library was confirmed by comparing input data between BIM solutions by creating a pilot PIM library. The KS test data of BIPV for inputting the specifications information of the PIM library were investigated by nine manufacturers with KS-certified BIPV module products. The specifications information was classified into 54 factors to confirm whether the manufacturer disclosed the data. Most manufacturers agreed to disclose basic electrical specifications, such as the module output and voltage; however, they were reluctant to disclose items related to the company’s business, such as circuit composition, materials, and prices. In the case of input specifications for electrical safety inspection related to the pre-use inspection of BIPV, the input specifications of the PIM library could be prepared easily because only the items agreed by the manufacturer were in the KS report. For the BIM design of BIPV, where both architectural and electrical elements exist simultaneously, the method of creating a library in Revit among BIM solutions was investigated. The categories and types of PIM libraries presented in this study were analyzed and presented. A pilot PIM library was created using the proposed method. The openness of the library was confirmed through a comparison of BIPV shapes and attributes with other BIM solutions. - COLLAPSE
    30 April 2024
  • Research Article

    Performance Analysis of Solar Thermal Heat Pump for Hot Water Supply to Industrial Process

    산업공정 온수 공급을 위한 태양열 히트펌프의 성능해석

    Lim Byung-Ju, Cho Sung-Hoon, Lee Ga-Ram, Park Chang-Dae

    임병주, 조성훈, 이가람, 박창대

    The thermal energy used in industrial processes is largely obtained from fossil fuels, causing global warming through carbon dioxide emissions. Worldwide efforts … + READ MORE
    The thermal energy used in industrial processes is largely obtained from fossil fuels, causing global warming through carbon dioxide emissions. Worldwide efforts are underway to achieve decarbonization by using renewable energy sources to supply thermal energy. Solar energy, that offers infinite energy potential over a wide temperature range, and heat pumps, that provide a stable and an efficient heat supply, can synergize and capitalize on the advantages of each other. This study aimed to develop a solar thermal source heat pump (SSHP) to replace the existing 0.5 ton/h LPG steam boiler in food processing. Through a performance analysis, the heat supply ratio, solar fraction, and seasonal performance factor were derived based on the solar collector area and storage volume. The results indicated that the heat supply ratio of the SSHP was influenced more by the collector area than by the thermal storage volume. When the SSHP collector area was below a certain value, increasing the thermal storage volume reduced the SSHP heat supply ratio. Therefore, to operate the system stably and achieve a high performance index, the collector area must be larger. For the subject food process, a collector area larger than 210 m2 was required to achieve a seasonal performance factor exceeding 2.52, equivalent to power generation efficiency. - COLLAPSE
    30 April 2024
  • Research Article

    Correlation Analysis for LCOE and Cost Components with Terrain Complexity for Korean Onshore Wind Farms

    지형복잡도에 따른 국내 육상풍력발전단지의 LCOE와 그 구성요소에 대한 상관도 분석

    Lee Keonwoo, Yang Kyoungboo, Ko Kyungnam

    이건우, 양경부, 고경남

    A study on the relationship between levelized cost of energy (LCOE), its components, and terrain complexity was conducted for Korean onshore wind … + READ MORE
    A study on the relationship between levelized cost of energy (LCOE), its components, and terrain complexity was conducted for Korean onshore wind farms. The 22 wind farms are selected for this study. The actual capital expenditures (CapExs) and operational expenditures (OpExs) of the wind farms are collected from the Data Analysis Retrieval Transfer (DART) system of the Korean Financial Supervisory Service. The capacity factors (CFs) of the wind farms are estimated using the dataset of system marginal price (SMP), renewable energy certificate (REC), and capacities of wind farms. To evaluate terrain complexity, the ruggedness index (RIX) is calculated using the installed wind turbine locations of analyzed onshore wind farms and the numerical terrain contour data. The average RIX is 25.53% that corresponds to mountainous terrain. The correlation analysis is performed to determine the relationship between CF, CapEx, and OpEx in accordance with RIX. The LCOE is calculated from the actual expenditures and estimated CFs. Consequently, the average LCOE is estimated to be 141.04 USD/MWh. The correlation analysis reveals no relationship between LCOE, its components, and RIX. - COLLAPSE
    30 April 2024
  • Research Article

    Photovoltaic System Output Analysis and Tracking Method Based on the Surveyed Data

    실측 데이터를 활용한 태양광 발전 시스템의 출력 분석 및 추정 방법

    Kim Hyun-Woo, Ahn Seon-Ju, Yun Sang-Yun, Choi Joon-Ho

    김현우, 안선주, 윤상윤, 최준호

    In this study, the measurement data from the photovoltaic demonstration site and the sensing data from solar radiation and temperature sensors are … + READ MORE
    In this study, the measurement data from the photovoltaic demonstration site and the sensing data from solar radiation and temperature sensors are used to propose a method for analyzing photovoltaic output and a method for tracking it. For photovoltaic output analysis, the theoretical output and profile of the photovoltaic are derived based on the installation and history data. Using the proposed temperature coefficient, the theoretical calculation result of the photovoltaic output is supplemented with the expected output optimized for the site. For photovoltaic output tracking, the current photovoltaic output is tracked based on the amount of solar radiation and temperature sensor data. The site-optimized radiation and weather coefficients are derived from historical data, and the photovoltaic output is tracked by applying each coefficient to the sensing data for a certain time period. The proposed methods are designed and verified based on the survey data from a demonstration site established at Chonnam National University, Yongbong-dong, Gwangju. - COLLAPSE
    30 April 2024
  • Research Article

    Analysis on Performance of Arched Photovoltaic System

    아치형 태양광 시스템의 발전 성능 분석

    Shin Woo Gyun, Ju Young Chul,Hwang Hey Mi,Ko Suk Hwan

    신우균, 주영철, 황혜미, 고석환

    An arched photovoltaic (PV) system differs from a typical PV system structure because it features PV modules arranged in an arch, each … + READ MORE
    An arched photovoltaic (PV) system differs from a typical PV system structure because it features PV modules arranged in an arch, each with a varying installation angle. An arch structure is an installation method that ensures aesthetics in architectural structures, such as noise barriers, or in unused areas, such as agricultural canals. However, the varying installation angles may cause losses in power generation depending on the configuration of the PV strings. In this study, 3 kW arched PV systems were constructed to analyze power generation, and assess the resulting mismatch losses. After analyzing the power generation for approximately 16 months, the results demonstrated that an east-west oriented arched PV system exhibited higher power generation than a north-south oriented arched PV system. Simulations of the I-V curves using the actual measured irradiance values for various installation angles and measured maximum irradiance values confirmed the occurrence of mismatch losses owing to the installation angle. - COLLAPSE
    30 April 2024
  • Research Article

    Characteristics Analysis of Electric Vehicle Used Li-ion Battery for Application to Energy Storage System

    에너지저장장치 적용을 위한 리튬이온 기반 전기차 사용 후 배터리 특성 분석

    Kim Ju-Hee, Yang Dong Cheol, Kim Ji Hyun, Park Jongsung, Kim Changheon

    김주희, 양동철, 김지현, 박종성, 김창헌

    Ecofriendly policies have led to a continuous increase in the supply of electric vehicles (EVs) and energy storage systems (ESSs). Therefore, technologies … + READ MORE
    Ecofriendly policies have led to a continuous increase in the supply of electric vehicles (EVs) and energy storage systems (ESSs). Therefore, technologies for reusing and remanufacturing used EV batteries must be developed. Although the lifespan characteristics of EV battery packs may vary according to the conditions of use, their range of use is usually 100%–80%, considering the performance output based on EV standards. When used as ESSs, they may be used for an additional 5–10 years. In this study, we analyzed the electrical characteristics of used battery modules to classify the reuse of used EV batteries. The used battery modules of an electric bus with operation records were utilized in this study. For the electrical characteristics, used battery module’s voltage, internal resistance, and charge-discharge tests were conducted. - COLLAPSE
    30 April 2024
  • Research Article

    A Study on the Floating Body Performance and Mooring System Design of an Offshore Floating Solar System with Glass Fiber Reinforced Polymer Frame Members

    GFRP 연결체로 구성된 해상부유식 태양광발전구조물에 관한 계류시스템 설계 및 부유체 성능평가 연구

    Lee Kangsu, Park Byoungjae, Kim Byoung Wan

    이강수, 박병재, 김병완

    Because of paucity of land, photovoltaic systems are increasingly being installed in coastal waters. However, specifications, such as the type and size … + READ MORE
    Because of paucity of land, photovoltaic systems are increasingly being installed in coastal waters. However, specifications, such as the type and size of the structure applied to the offshore floating photovoltaic system, differ for onshore systems. This difference in specification results in numerous safety problems. Therefore, sea environmental conditions should be considered for the safety design of the floating body structure for photovoltaic systems. Accurate wave load evaluation and appropriate mooring line design for the target sea area are critical for effective design. In this study, a hydrodynamic design of an offshore photovoltaic floating structure was developed with glass-fiber-reinforced plastic (GFRP) as a structural member and appropriate arrangement of mooring lines. Numerical analysis of in-house code developed using KRISO was performed to optimize floating body motion stability and mooring line arrangement for an offshore floating photovoltaic power generation system with GFRP structural members. The results of the analysis confirmed the stability of the floating system and damage limit of the mooring line. - COLLAPSE
    30 April 2024
  • Research Article

    Economic Feasibility Study on an Integrated System of Solar Thermal-Heat Pump for Industrial Process Steam Supply

    산업공정용 증기 공급 태양열-히트펌프 융합 시스템의 경제적 타당성 평가

    Lee Ga-Ram, Lim Byung-Ju, Cho Sung-Hoon, Farooq Muhammad, Park Chang-Dae

    이가람, 임병주, 조성훈, 파룩, 박창대

    Thermal energy is essential for various industrial processes like liquid heating, drying, and sterilization, demanding temperatures above 100°C. It is mainly generated … + READ MORE
    Thermal energy is essential for various industrial processes like liquid heating, drying, and sterilization, demanding temperatures above 100°C. It is mainly generated from fossil fuels, which often leads to carbon dioxide (CO2) emissions and climate crises. Therefore, it is imperative to shift from fossil-fuel based energy to renewable or cleaner energy for the sake of the environment. High-temperature heat pumps are key components for shifts in industrial fields. Industrial high-temperature heat pumps require high-temperature heat sources for evaporation. A solar thermal system can provide a high-temperature heat source and direct heat production. This study aims to evaluate the economic feasibility of an integrated system that combines a solar thermal system and a high-temperature heat pump for supplying steam to industrial processes. Modeling and performance simulations were conducted on the system using Simulink. Economic factors such as the benefit-cost ratio, net present value, and levelized cost of heating (LCOH) were analyzed based on the solar collector area. The results of the study demonstrated that the solar thermal-heat pump can economically substitute a 0.5-ton steam boiler. Notably, CO2 emissions can be reduced by up to 1,600 tons annually by replacing LPG boilers. - COLLAPSE
    30 April 2024