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손병후(Byonghu Sohn),최재호(Jae Ho Choi),민경천(Kyung Chon Min) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.1
Geothermal heat pump (GHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy using efficiency. These systems use the ground as a heat source in heating mode operation and a heat sink in cooling mode operation. The aim of this study is to evaluate the heating performance of the GHP system for a residential building (420 m2) in Ulaanbaatar, Mongolia. In order to demonstrate the feasibility of a sustainable performance of this system, we installed the water-to-water geothermal heat pump with ten vertical ground heat exchangers and measured operation parameters from October 19, 2013 to March 26, 2014. The results showed that the entering source temperature of brine from the ground heat exchangers was in a range of the design target temperature of -10℃ for heating. For total values of the representative results, the ground heat exchangers extracted heat of 53.51 MWh from the ground. In addition, the GHP system supplied heat of 83.55 MWh to the building and consumed power of 30.27 MWh. Consequently, the average heating seasonal performance factor (SPFh) of the overall system was evaluated to be 2.76 during the measurement period of the heating season.
병원 건물에 설치된 냉각탑 병용 지열 히트펌프 시스템의 냉방 성능
손병후(Byonghu Sohn),이두영(Doo-Young Lee),민경천(Kyung-Chon Min) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.1
This paper presents the measurement and analysis results for the cooling performance of ground-coupled heat pump (GCHP) system using a cooling tower as a supplemental heat rejector. In order to demonstrate the performance of the hybrid approach, we installed the monitoring equipments including sensors for measuring temperature and power consumption, and measured operation parameters from May 1 to October 30, 2014. The results showed that the entering source temperature of brine returning from the ground heat exchanger was in a range of design target temperature. Leaving load temperatures to building showed an average value of 11.4°C for cooling season. From the analysis, the daily performance factor (PF) of geothermal heat pumps ranged from 4.4 to 5.2, while the daily PF of hybrid GCHP system varied from 3.0 to 4.0 over the entire cooling season.
TAC를 반영한 BIN 데이터 기반의 냉난방 부하 변화에 관한 연구
이광섭(Kwang Seob Lee),김유진(Yu Jin Kim),민경천(Kyung Chon Min),이의준(Euy Joon Lee),강은철(Eun Chul Kang) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.9
According to the Korea industrial standard of air conditioning systems (KS C 9306), cooling and heating loads for buildings can be calculated by using maximum and minimum temperature in BIN data. Cooling and heating loads can be determined by building set temperature and ambient temperature. Cooling and heating system capacity of buildings can be normally designed according to determined heating and cooling loads. Cooling and heating system capacity can be reduced by updated BIN data, applying TAC (Technical Advisory Committee) values. In this study, updated BIN data have been analyzed using ambient temperature of 19 areas in Korea for the last 10 years (2005~2014) provided by KMA (Korea Meteorological Administration). Building cooling and heating loads have been calculated following TAC based BIN data. As a result, designed system capacity decreased depending on applying TAC. Those were reduced as 7.1% (100 m² building), 8.7% (1,000 m² building) in cooling capacity, 11.7% in heating capacity when TAC 2.5% applied. And also, it is expected system initial and operating cost by decreasing system capacity.
지역난방-신재생에너지 하이브리드 열공급시스템 구축을 위한 열부하 및 열공급 분석
윤석만(Seok Mann Yoon),김진홍(Jin Hong Kim),김용기(Yong Ki Kim),민경천(Kyung Chon Min),이중용(Joongyong Yi) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Recently, development of new and renewable energy technologies is becoming more important due to rising fossil fuel prices and conerns about environmental problems due to rising energy demand. In particular, when the heat generated from renewable energy sources is different from the thermal load, it should be operated so that heat storage or heat radiation operation can be performed smoothly. The purpose of this study is to calculate the system configuration and capacity through the heat load and heat supply analysis of the demand source in order to find a way to link the renewable energy hybrid heat supply system with district.