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백남춘(Baek Nam-Choon),정시영(Jeong Si-Yong),신우철(Sin Woo-Chul),윤응상(Yoon Eung-Sang),주문창(Joo Moon-Chang),박상래(Park Sang-Lae) 한국태양에너지학회 1996 한국태양에너지학회 논문집 Vol.16 No.3
집열온도가 높은 PTC 집열기를 이용하는 흡수식 태양열 냉ㆍ난방 시스템에 대한 성능분석과 Parametric study를 수행하였다. 이를 위해 소형 태양열 구동 흡수식 냉동기에 대한 시뮬레이션을 통해서 작동특성 및 성능을 파악하였다. 전체적인 시스템 분석은 TRNSYS(Transient Simulation Program)를 이용하였으며, TRNSYS에 없거나 보완이 필요한 몇가지 요소(Component) 즉, 흡수식 냉동기, PTC 집열기 등에 대해서는 별도의 부 프로그램을 만들어 TRNSYS의 하나의 모듈로 사용하였다. 본 연구에서 개발된 이 TRNSYS Deck는 태양열 냉방시스템을 설계하고 분석하는데 유용하게 이용될 수 있을 것으로 기대된다. A performance analysis and parametric study on the solar absorption cooling and heating system using PTC solar collector are performed. A small absorption chiller driven by solar thermal energy is also investigated by numerical simulation for this study. TRNSYS Program is used for the analysis of complete system. Some specific component like as PTC solar collector and absorption chiller driven by solar energy are added into a standard TRNSYS library for this study. This TRNSYS deck developed in this study will be helpful for system design and evaluation of solar heating and cooling system.
백남춘(Baek Nam-Choon),윤종호(Yoon Jong-Ho),윤응상(Yoon E. S),유창균(Yoo C. G),주문창(Joo M. C),손선우(Son S. W) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study is on the evaluation of KIER Zero Energy Solar House(ZeSH). This ZeSH was designed and constructed for the goal of 70% self sufficiency only thermal loads. Various innovative technologies for reducing thermal load such as super insulation, high performance window, passive solar systems, ventilation heat recovery system , etc are applied in this ZeSH. In this study, the performance of the active solar heating system with geothermal heat pump as an auxiliary energy system and the energy self sufficiency rate are especially analyzed by experiment. Indoor setting temperature of ZeSH is 20℃ throughout the experimental period. As a result, the performance of active solar system is 35 to 40% depending on the various ambient condition and the solar fraction for heating season is about 74%.
태양열 축열조가 없는 변유량 제어 방식의 지역난방용 태양열시스템 실증시험연구
백남춘(Baek Nam-Choon),신우철(Shin U-Chul),이진국(Lee Jin-Kook),유응상(Yoon Eung-Sang),윤석만(Yoon Suk-man) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.5
In this study, the design of the solar heating system for district heating as well as it's operating characteristics and the performance analysis was carried out. This solar district heating system was composed of two different types of solar collector circuit, flat plate and vacuum tube solar collector, in a system. This system supply constant temperature of hot water without solar buffer tank. For this, the proportional(variable flow rate) control was used. The experimental facility for this study was used the Bundang district solar heating system which was installed in the end of 2006. The operating characteristics and behaviour of each collector circuits are investigated especially for the system design and control. The yearly solar thermal efficiency is 47.5% on the basis of aperture area and 39.8% on the basis of gross area of collector. As a result this solar heating system without solar buffer tank and with proportional controller was testified a very effective and simplified system for district heating. It varied especially depend on the weather condition like as solar radiation and ambient temperature.
백남춘(Baek Nam-Choon),신우철(Shin U-Cheul) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.6
In this study the thermal performance and economic analysis program of solar heating system for district heating was developed. This program, named SOLAN-DHS and based on TRNSYS, consisted of four modules like as user's interface for system input/output, library, and utilities and a calculating engine. SOLAN- DHS simplifies user's input data through the database of most system engineering data including weather data of 17 areas in Korea. Five different types of solar systems which can be applicable to district heating system were presented in this program. Due to the user-friendly layout, all design parameters can be changed quickly and easily for the influence on system efficiency. The reliability of SOLAN-DHS was finally verified by the experiments.
백남춘(Baek Nam-Choon),신우철(Shin U-Cheul) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
This study analyzed by simulation using TRNSYS as well as by experiment on the solar district heating system installed for the first time for the district heating system in Bundang. Simulation analysis using TRNSYS focused on the thermal behavior and long-term thermal efficiency of solar system. Experiment carried out for the reliability of simulation system. This solar system where the circuits of two different collectors, flat plate and vacuum tube collector, are connected in series by a collector heat exchanger, and the collection characteristics of each circuit varies. Therefore, these differences must be considered for the system's control. This system uses variable flow rate control in order to obtain always setting temperature of hot water by solar system. Specifically, this is a system that heats returning district heating water (DHW) at approximately 60℃ using a solar collector without a storage tank, up to the setting temperature of approximately 85~95℃ To realize this, a flat plate collector and a vacuum tube collector are used as separate collector loops. The first heating is performed by a flat plate collector loop and the second by a vacuum tube collector loop. In a gross collector area basis, the mean system efficiency, for 4 years, of a flat plate collector is 33.4% and a vacuum tube collector is 41.2%. The yearly total collection energy is 2,342GJ and yearly collection energy per unit area (㎡) is 1.92GJ and 2.37GJ respectively for the flat plate vacuum tube collector. This result is very important on the share of each collector area in this type of solar district heating system.
벽체일체형 자연순환 태양열온수기의 동적거동과 열성능에 관한 실증연구
백남춘(Baek Nam-Choon),김성범(Kim Sung-Bum),신우철(Shin U-Cheul) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.6
In this study, the evaluation of the dynamic behavior and thermal performance of the “Façade integrated Natural circulation Solar Water Heating System” installed in the residential house was carried out. Experimental tests were performed during the all year around in the rural houses of 166 m² in size. Facade integrated solar collector of 5 m² were installed on the south-facing. Electrical heater of 1 kW capacity as an auxiliary heater was installed at the upper part of the heat storage tank. The analyzing results are as follows. (1) Monthly average solar fraction was 51 to 87% and yearly average value is 64%. (2) Hot water supply temperature in December which has the lowest solar altitude is 37 to 76℃. The highest working fluid temperature of solar collector in this period was below 84℃. The temperature difference of working fluid between the collector inlet and outlet has been shown to be around 9 to 26℃. (3) Overheating which is one of the biggest problems during summer did not appear at all, but rather had hot water supply temperature is rather low as 30~47℃ in summer than winter, which is supplied by a small solar load. The solar collecting temperature has been shown to maintain below 55℃. (5) The thermal performance of Facade integrated solar collector can be increase due to the reduction of heat loss to the back of the collector wall integration of the collector is reduced. As a conclusion, Facade integrated natural circulation type Solar Water Heating System is a well-functioning without any pumps or controllers, and it was found that the disadvantages of conventional solar water heaters, hot water or hot water system can be greatly improved.