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공형진,권순기,지승규,Kong, Hyoung Jin,Kwon, Soon-Ki,Ji, Seung Gyu 대한기계학회 2016 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.4 No.1
Ground source heat pump(GSHP) systems is known as environmental friendly and energy saving. Especially a ground heat exchanger is an important unit that determines the thermal performance of a system and initial cost. In design phase of vertical GSHP system, it is recommended that the effective borehole thermal resistance, be determined from in-situ thermal response test. In this study, ground effective thermal conductivity was categorized by a region. As a result of the study, the ground thermal conductivity of national average was analyzed as 2.56 W/mK. The highest regional average of thermal conductivity is 2.68 W/mK in Seoul, and the lowest is 2.28 W/mK in Busan. Also, the thermal conductivity on the coast has been analyzed approximately 30% lower than the average. 지열 히트펌프 시스템은 환경 친화적이고 에너지 절감 시스템으로 알려져 있다. 특히 지중 열교환기는 초기투자비와 시스템 성능을 결정하는 매우 중요한 요소다. 수직형 지열 시스템 설계를 위해서는 현장 열응답 테스트를 통해 지중 유효 열저항을 고려해야 한다. 본 연구에서는 지열이용검토서를 통해 접수된 전국의 지중 열전도도를 지역별로 분석하였다. 전국 평균 지중 열전도도는 2.56 W/mK로 분석되었다. 지중 열전도도가 가장 높은 지역은 서울로 평균 2.68 W/mK이고, 가장 낮은 지역은 부산으로 2.28 W/mK다. 또한 해안을 접하고 있는 지역의 열전도도는 전국 평균에 비해 약 30% 낮다.
공형진(Hyoung Jin Kong),강성재(Sung Jae Kang),윤경식(Kyoung Sik Yun),임효재(Hyo Jae Lim) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.3
Ground Source Heat Pump (GSHP) systems utilize geothermal energy as a thermal source or sink, for heating, cooling and domestic hot water. It is well known that GSHP is environmentally friendly, and saves energy dramatically. For this reason, many investigative researches have been conducted on commercial and governmental buildings. However, studies on residential GSHP are few, because of the small capacity and cost. In this study, we experimented with the characteristic performance of heating, cooling and seasonal performance factor for a residential GSHP system, which consisted of two 180 m deep u-tube ground heat exchangers, a heat pump and measurement instruments. The installed capacity of the heat pump was 5RT, and the conditioning area was 62.23 ㎡. From the experimental results, the cooling COP of the heat pump was 4.13, and the system COP was 3.51, while the CSPF was 3.32. On the other hand, the heating COP of the heat pump was 3.87, and the system COP was 3.39, while the HSPF was 3.39. Also, in-situ cooling COP and capacity were 93.7% and 96.4% compared with the EWT certification data, respectively, and that of heating were 98.3% and 95.7%, respectively.
지중 순환수 온도변화에 따른 지중 열교환기 성능 및 길이 변화 연구
공형진(Hyoung Jin Kong),강성재(Sung Jae Kang),윤경식(Kyoung Sik Yun),임효재(Hyo-Jae Lim),한지원(Ji-Won Han) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
This study was residential geothermal heat pump systems, of the heating operation according to out door temperature and variation EWT and length of ground heat exchangers of heating load change analyzed. EWT was according to the out door temperature was affected by the indoor heating load, then affected by the operation time. The results of this experiment show system maximum COP 6.0 to the minimum 2.9. moreover average COP is 3.47 and it was the heat extraction of average 15.2㎾ analyzed. Also EWT depending of change to the ground heat exchanger length was largest 55.2% to the lowest 9.5%.
가정용 지열원 열펌프 시스템을 이용한 바닥 난방 성능 연구
공형진(Hyoung Jin Kong),임효재(Hyo Jae Lim),윤경식(Kyoung Sik Yun),최재호(Jae Ho Choi),강성재(Sung Jae Kang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
Residential ground source heat pump systems(GSHP) practically use the geothermal energy in providing building heating/cooling and hot water at the same time. The systems are not affected by ambient temperature and use constant temperature heat source and heat sink through the year, featuring as high efficiency and environmental friendliness. In this study, an analysis of the heating operation COP for GSHP floor heating system was conducted. Indoor average temperature was 25.1℃ with PB 6mm pipe and heating capacity of 2.1kW, and it was 22.3℃ with PB 12mm pipe and heating capacity of 2.2kW. Using capillary tube, Indoor average temperature became 26.5℃ with heating capacity of 4kW. During the heating operation, the calculated results showed heat extraction rate of 8.1kW, power consumption 3.1kW, and heating capacity of heat pump 11.2kW. In addition, the heating COP of heat pump was 3.6 and the heating COP of the system was 3.1.
개방형 지열에너지 설비 지열이용검토서 분석 및 개선방안 연구
공형진(Hyoung Jin Kong),박준모(Jun Mo Park),권순기(SoonKi Kwon) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Standing Column Well(SCW) heat pump system can achieve higher performance of the system by utilizing heat source of the annual constant groundwater temperature. The performance of SCW system depends on the ground thermal and hydraulic characteristic. In this study, we analyzed loop pump power, secondary pump power and coefficient of performance through SCW heat pump system geothermal energy evaluation report. As a result, the average cooling load of the SCW system was 1,055.4 kW and heat pump installation capacity increased by 112.1% to 1198.6 kW. And the average power requirement for loop pump was 34.2 W/kW and the power requirement for 2nd pump was 13.1 W/kW. At the time of cooling, heat pump COP was 4.64, system COP 3.77, during the heating, heat pump COP 4.08 and system COP was 3.46.
지중열교환기 설치 조건이 지중 유효 열전도도에 미치는 영향에 관한 실험적 연구
공형진(Hyoung Jin Kong),임효재(Hyo Jae Lim),최재호(Jae Ho Choi),손병후(Byonghu Sohn) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
A ground-loop heat exchanger in a ground source heat pump system is an important unit that determines the thermal performance of a system and its initial cost. The size and performance of this heat exchanger is highly dependent on ground thermal properties. A proper design requires certain site-specific parameters, most importantly the ground effective thermal conductivity, the borehole thermal resistance and the undisturbed ground temperature. This study was performed to investigate the effect of some parameters such as borehole lengths, various grouting materials and U-tube configurations on ground effective thermal conductivity. In this study, thermal response tests were conducted using a testing device with 9-different ground-loop heat exchangers. From the experimental results, the length of ground-loop heat exchanger affects to the effective thermal conductivity. Among the various grouting materials, the bentonite-based grout with silica sand shows the largest thermal conductivity value.
이진규(Jin Kyu Lee),공형진(Hyoung Jin Kong),임효재(Hyo Jae Lim) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Bentonite is generally used as grouting material for ground heat exchanger in geothermal heat pump system. It has to contain properties of high heat transfer, adequate expansion rate and good water proof. The purpose of this study is to examine the thermal and physical properties such as thermal conductivity and flow viscosity. The mass ratio which means the mass of bentonite to water varied from 10% to 20% and the properties were measured. The effect of superplasticizer was also considered. The thermal conductivity was nearly constant with mass ratio in no superplasticizer. But it slightly increased in the added superplasticizer. The viscosity of bentonite in no superplasticizer increased to 3.0~4.2 times and increased to 1.6~3.3 times in superplasticizer. Therefore, the effect of superplasticizer is found to control the expansion rate and viscosity of bentonite.
지표수 열교환기 적용 지열 히트펌프 시스템의 냉방 성능
임효재(Hyo Jae Lim),공형진(Hyoung Jin Kong),손병후(Byonghu Sohn) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.6
Commercial buildings and institutions are predominantly cooled, thereby dissipating excess heat to a vertical ground heat exchanger (VGHE), than heat extracted over an annual cycle. Surface waters, such as lakes and ponds, provide a cost-effective means of reducing the VGHE length, and in balancing the thermal loads to the ground. This paper presents the measurement and analysis of the cooling performance of ground-coupled heat pump (GCHP) system, using surface water heat exchanger (SWHE) submerged in an artificial pond. In order to measure the performance of the system, we installed monitoring equipment, including sensors, for assessing the temperature and power consumption, after which the operation parameters were determined. The results from the thermal performance test for the SWHE indicate that the temperatures at the outlet of the SWHE and within the pond were affected by outdoor air temperature. In addition, the results reveal similar variation trends on temperatures; however, the peak temperatures of the SWHE were somewhat greater than those of outdoor air, due to the thermal capacity of the pond. Analyzing the cooling performance over the measurement period, the average coefficient of performance (COP) of heat pump was found to be 5.71, while that for the entire system was 2.99.
강성재(Sung Jae Kang),공형진(Hyoung Jin Kong),윤경식(Kyoung Sik Yun),김갑득(Kap Duck Kim),임효재(Hyo Jae Lim),김일중(Il Jung Kim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Residential ground source heat pump systems(GSHP) practical use the geothermal energy of the building heating/cooling and hot water in same time. The system is consistent throughout the whole year heat pump geothermal energy(heat source) and the heat sink so as to use, energy use, it features by high efficiency and environmentally friendly. Ground source heat pump system utilizes the design of your home heating system through coefficient of performance(COP) by measuring the ground source heat pump expanded, the prevalence is considered an important little effect. Heat pump COP is the 3.80 to 4.80. System COP 3.10 and SPF 3.37. COP 24% heating capacity a 20% decrease has shown when EWT decreased 15%. In addition, the effectiveness of the ground heat exchanger for heating your home by comparing the optimal design for the floor heating system should be accompanied by a study.