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백남춘,양윤섭,윤응상,이진국,주문창,Baek, N.C.,Yang, Y.S.,yoon, E.S.,Lee, J.K.,Joo, M.C. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.1
In this experimental study, the air cooling radial shape heat exchanger which influences on the COP and the cooling capacity by heat and mass transfer rate in the adsorbent bed was designed and applied to test its performance for adsorption heat pump(AHP). Zeolite-water was used for the adsorbent-adsorbat pair. As a result, the cooling COP and a cycle period of this adsorption heat pump are 0.28 and 2 hours, respectively, on the condition of none heat recovery from the adsorption reactor(absorber). The other results and recommendations are mainly related to improving the heat and mass transfer inside the absorber to reduce a cycle period.
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),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.
단독주택용 태양열/지열 융복합시스템의 태양열 급탕성능 평가
백남춘(Namchoon Baek),한승현(Seunghyun Han),이왕제(Wang Je Lee),신우철(Ucheul Shin) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.11
In this study, an analysis was performed on the performance of the solar water heating system with geo-thermal heat pump for a detached house. This system has a flat plate solar collector (8 ㎡) and a 3 RT heat pump. The heat pump acts as an auxiliary heater of the solar water heating system. These systems were installed at four individual houses with the same area of 100 ㎡. The monitoring results for one year are as follows. (1) The average daily operating time of the solar system appeared to be 313 minutes in spring (intermediate season), and 135 minutes and 76 minutes in winter and summer respectively. The reason for the short operating time in summer is the high storage temperature due to low water heating load. The high storage temperature is caused by a decrease in collecting efficiency as well as by overheating. (2) The geothermal heat pump as an auxiliary heater mainly operates on days of poor insolation during the winter season. (3) Despite controlling for total house area, hot water consumption varies greatly according to the number of people in the family, hot water usage habits, etc. (4) The yearly solar fraction was 69.8 to 91.5 percent, which exceeds the maximum value of 80% as recommended by ASHRAE. So the solar collector area of 8 ㎡ appeared to be somewhat greater for the house with an area of 100 ㎡. (5) The observed annual efficiency of solar systems was relatively low at 13.5 to 23.6%, which was analyzed to be due to the decrease in thermal efficiency and the overheating caused by a high solar fraction.
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(Namchoon Baek),김성범(Sungbum Kim),오병칠(Byungchil Oh),윤종호(Jongho Yoon),신우철(Ucheul Shin) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.7
This study analyzed analyzes the energy performance of six houses in Daejeon completed which were built in 2011. Observed The observed houses, which were all designed and constructed inof the same size and structure, are were highly insulated with triple Low-E coating windows; the insulation level of the walls is was 0.13 W/㎡K and that of the roof is was 0.10 W/㎡K. As electric houses, all of the energy supplied to the houses, including for cooking, is was supplied by electricity. A and 3~4 kWp of photovoltaic system and a 3~5 kW of ground source heat pump (GSHP) were installed in each house tofor providing provide space heating/and cooling and hot water are installed. We constructed a Web-based remote monitoring system in order to understand energy consumption and the dynamic behavior of the energy system. T, and the results of our metering data analysis of 2013 are as follows. First, the annual residential energy consumption is was 4,400 kWh (σ = 1,209) and GSHP energy consumption is was 5,182 kWh (σ = 1,164). Second, residential energy consumption ranked highest in average energy usage, with at 45% of the total, followed by heating with at 30%, hot water supply with at 17% and cooling with at 6%. Third, the average energy independence rate is was 51.8%, the GFA (Gross gross floor area) criteria average energy consumption unit is was 48.7 kWh/㎡yr (σ = 10.1), and the net energy consumption unit (except the energy yield of the PV systems) is was 24.7 kWh/㎡yr (σ = 8.8).