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양방향 설정온도 제어에 따른 지중연계 히트펌프 시스템의 에너지 절감량 평가 연구
강은철(Eun-Chul Kang),이의준(Euy-Joon Lee),민경천(Kyong-Chon Min) 한국지열·수열에너지학회 2014 한국지열에너지학회논문집 Vol.10 No.2
Government has recently restricted heating and cooling set temperatures for the commercial and public buildings due to increasing national energy consumption. The goal of this paper is to visualize a future two way indoor set temperature control impact on building energy consumption by using TRNSYS simulation modeling. The building was modelled based on the twin test cell with the same dimension. Air source ground coupled heat pump performance data has been used for modeling by TRNSYS 17. Daejeon weather data has been used from Korea Solar Energy Society. The heating set temperature in the reference room is 24℃ as well as the target room set temperature are 23℃, 22℃ and 20℃. The cooling set temperature of the reference room is also 24℃ as well as the target room set temperature of 25℃, 26℃, 27℃ and 28℃. For the air source heat pump system, heating season energy consumption is 35.52 kWh/m²y in the reference room. But the heating energy consumption in the target room is reduced to 7.5% whenever the set temperature decreased every 1℃. The cooling energy consumption in the reference room is 4.57kWh/m²y. On the other hand, the energy consumption in the target room is reduced to 22% whenever the set temperature increased every 1℃ by two way controller. For the geothermal heat pump system, heating energy consumption in the reference room is reduced to 20.7%. The target room heating energy consu7mption is reduced to 32.6% when the set temperature is 22℃. The energy consumption in the target room is reduced to 59.5% when the set temperature is 26℃.
태양열 신선 외기 난방 단위 모듈 에너지 성능 평가 monitoring에 관한 연구
강은철(Eun-Chul Kang),현명택(Myung-Taek Hyun),이의준(Euy-Joon Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Solar Air Systems(SAS) have unique advantages for space heating and tempering ventilation air. Air, unlike water, needs no protection against freezing nor are leaks damaging to the building structure or its contents. In contrast to glazed collector, unglazed steel solar collector may have higher efficiencies over glazed flat collector due to the absence of the glass. Therefore, the monitoring of SAS is so important to evaluate a dual performance of SAS for right applications. This study is to provide a testing method with a movable test cell developed in KIER to evaluate the thermal performance of SAS based on international standard method ASHRAE 93-86, Method of Testing to Determine the Thermal Performance of Solar Collectors. The monitoring tool used advanced technique LabVIEW with portable notebook computer. A sample set of results has been obtained to access the performance of a reference and a target SAS sample.
Tracepro를 활용한 이중 블라인드 광파이프 채광 시스템의 블라인드 설계 및 시스템 효율 평가
강은철(Eun-Chul Kang),이의준(Euy-Joon Lee),유성연(Seong-Yeon Yo) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.6
A daylighting system includes three parts; light collector, light transformer and light distributor. A DBLP(Double blind light pipe) daylighting system consists of a double blind light collector, a mirror duct type light transformer and a prism film light pipe distributor. The double blinds for a light collection are used to track the sun’s altitude and azimuth movements throughout the day. Behind both sets of blinds is the light transformer, which is based on a rectangular cone shaped light duct. The light transformer was designed to efficiently deliver the light into the light pipe within a 30 degree radial spread for the efficient light into the distributor. In this study, DBLP system efficiency was simulated, evaluated and optimized by Tracepro as a popular ray trace light design simulation program. The results indicated that DBLP system efficiency evaluated a maximum 22.4% in case of Spring/Fall season solar noon time. While the overall average system efficiency in the morning and afternoon is evaluated about 10%.
물 대 물 히트펌프 시스템 성능 데이터 검증 방안 연구
강은철(Eun Chum Kang),장재철(Jae Cheol Chang),이의준(Euy Joon Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
히프펌프 시스템은 적용 현장(Site), 적용 건물(Building), 적용 시스템(System)이 통합되어 구현되었을 때에 성능을 평가하는 것이 중요하다. 왜냐하면, 현장이나 건물 용도에 따라 히트펌프의 성능이 다르게 나타나기 때문이다. 본 연구에서는 히트펌프 유닛에 대한 성능 평가용 실험장치를 구현하였다. 그리고 히트펌프 제조사에서 제공한 성능데이터를 TRNSYS 시뮬레이션 도구를 이용하여 실험에서 구한 성능데이터와 비교 검증하였다. 그 결과 실험에서 구한 성능데이터와 시뮬레이션에서 구한 성능데이터의 오차는 난방시 평균 3.5%, 냉방시 평균 4.1%로 나타났다. It is important to evaluate the heat pump performance when site, building, system are integrated implementation. Because the heat pump performance is different according to the applied site and buildings. We developed the experimental device to evaluate the water to water heat pump system performance. And we compared heat pump performance data provided by the manufacturer using the TRNSYS simulation tool with actual performance data obtained from experiments. As a result, the performance data obtained from experiments and simulations were different that heating error was 3.5% in case of cooling error was 4.1%.
강은철(Kang Eun-Chul),최용전(Choi Yong-Jun),이의준(Lee Euy-Joon) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
This study aims to evaluate of POF daylighting system performance. In this study, POF daylighting system has developed and applied to KIER test buildings. POF daylighting system consists of three parts: light collector, light transmitter and light diffuser. The light collector includes a circular Fresnel lens which gathering and focusing solar direct illuminance by sun tracking. The light transmitter contains the POF(Plastic optical fiber) cable which has light transmission loss of 4.5% per meter. The light diffuser has about 80% diffuser efficiency. At the results of POF system performance evaluation, theoretical POF system efficiency was 41.9% and actual POF system efficiency at the KIER test building was 38.2%. Moreover, system efficiency distribution almost uniformed at the actual test, except 16:00.