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액체식 제습시스템을 위한 유기 랭킨 사이클 작동유체 선정 및 성능 특성
동혜원(Hye-Won Dong),정재원(Jae-Weon Jeong) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.2
The purpose of this study was to determine the working fluid of an organic rankine cycle (ORC), a combined heat and power system, for a liquid desiccant system using a district heat source wasted in the cooling season. Considering the environmental impact, R245fa, R514A, n-Pentane, R1233zd(E), and Nove649 have been considered and the thermodynamic analysis of all fluids were conducted. As a result, Novec649 was recommended because of high total net power and heat recovery rate in the condenser in terms of effectively applying the wasted district heat source. With Novec649 recommended in this study, the test bed for ORC system was built and it can provide more than 50°C of inlet desiccant solution in the regenerator of liquid desiccant system without an auxiliary heater.
고분자 전해질 연료전지(PEMFC)의 운전을 통한 발전 및 열 생산 성능 예측 모델 개발
동혜원(Dong, Hye-Won),조수영(Jo, Su-Young),이성준(Lee, Sung-Joon),정재원(Jeong, Jae-Weon) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.10
A fuel cell has come up as an upcoming new and renewable energy recently. The fuel cell is the system which is converting chemical energy to power and heat. When applied to fuel cell in buildings, PEMFC(Polymer electrolyte membrane fuel cell) is mainly used due to relatively low operating temperature (50-100℃). Performance prediction models for fuel cell are actively being studied, however, researches are mainly focused on analysis about stack or electrochemical reaction in the fuel cell. The purpose of this study is to suggest empirical performance prediction model for PEMFC by statistically analyzing PEMFC operation data and to evaluate the feasibility of empirically derived models. Also, combining the data from this and previous study, electrical efficiency and thermal efficiency model are derived to completement each other. Fuel cell performance is predicted under any operating condition using these models.
유기 랭킨 사이클이 적용된 제습증발냉각기반 공동주택 중앙환기시스템의 에너지 성능 분석
동혜원(Hye-Won Dong),조혜진(Hye-Jin Cho),유소(Liu Su),정재원(Jae-Weon Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
The purpose of this research is to analyze the energy performance of the organic Rankine cycle (ORC) applied to a centralized liquid desiccant and evaporative cooling-assisted ventilation system in an apartment building. As a small combined heat and power application in apartment buildings, the ORC produces heat and power consumed by the proposed system and building. A conventional decentralized energy recovery ventilator (ERV) served by the existing power grid was chosen as a reference system. The ORC integrated with liquid desiccant and evaporative cooling-assisted ventilation system can offer energy savings by recovering heat from the ORC condenser compared to conventional ERVs. As a result, the proposed system could provide supply air with better condition and reduce the parallel system energy consumption. Consequently, the proposed system saved 27% annual primary energy with better system COP compared that of the ERV when the power produced from the ORC was applied for the common electricity of the building.
유기 랭킨 사이클 기반 액체식 제습시스템의 에너지 절감에 대한 실험적 연구
동혜원(Hye-Won Dong),김범준(Beom-Jun Kim),황유진(Yu-jin Hwang),임려화(Li-hua Lin),정재원(Jae-Weon Jeong) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
The main purpose of this study is to evaluate the primary energy saving potential of a liquid desiccant system integrated with an organic Rankine cycle (ORCLD). Based on the previous studies, the experimental apparatus of ORCLD was designed and built. The district heat source of 120°C and Novec649 were utilized as the heat source and the working fluid of ORC. When the maximum power output was achieved based on these conditions, the outlet temperature of the cooling water recovering waste heat from the condenser of ORC was approximately 47°C. The same temperature of water supplied to regenerator was applied to the reference system, which is the LD served by gas fired boiler and existing grid power. As a result, the proposed system could save the 25% of primary energy compared with the reference system. Consequently, the proposed system provides both primary energy savings remaining some of power and heat, which can be used in buildings.
직교류형 재생기의 수용액 온도에 따른 재생량 변화 분석
동혜원(Hye-Won Dong),최은지(Eun-Ji Choi),조민석(Min-Suk Jo),신장훈(Jang-Hoon Shin),정재원(Jae-Weon Jeong) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
The purpose of this study is to evaluate experimentally the impact of inlet solution temperature on the performance of an adiabatic cross flow regenerator. A lithium chloride aqueous solution was selected as the desiccant solution. The measured parameters were the temperature, mass flow rate, and concentration of the inlet solution and the temperature, mass flow rate, and humidity ratio of the air inlet and outlet. The inlet solution temperature varied from 50 to 90°C, and the inlet air temperature was set to approximately 30°C, which represents summer mode. The regeneration rate was used to analyze the mass transfer performance of the regenerator. The test results represented that the performance of the regenerator steadily improved as the solution temperature increased.