• Title/Summary/Keyword: GSHP : Ground source heat pump

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Performance Analysis on Combined Horizontal Ground Source Heat Pump with Earth tube using EnergyPlus (EnergyPlus를 이용한 수평형의 지열 히트펌프와 어스튜브를 조합한 시스템의 성능 검토)

  • Cho, Sung-Woo
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.13 no.2
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    • pp.22-29
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    • 2017
  • This study is performed to performance of the combined system the GSHP (Ground Source Heat Pump) system with the Earth tube system using EnergyPlus program. The Earth tube system using fan is characteristics as supply lower (higher) air temperature than outdoor air temperature in cooling and heating seasons, the GSHP system is characteristics as small indoor air temperature variation range. As the results of Earth tube + GSHP system simulation, GSHP power can be reduced than the GSHP single operation as 17.3% in cooling seasons and 32.5% in heating seasons, the GSHP design capacity can be replaced more small size.

A Study on Heat Transfer Performance of Vertical Ground Heat Exchanger of GSHP(Ground Source Heat Pump) (GSHP용 수직형 지중열교환기의 열전달 성능에 관한 연구)

  • Chung, Min-Ho;Chang, Ki-Chang;Ra, Ho-Sang;Baik, Young-Jin;Park, Seong-Ryong;Yoo, Seong-Yeon
    • Proceedings of the KSME Conference
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    • pp.2102-2107
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    • 2007
  • GSHP systems are used for air-conditioning systems in commercial buildings, schools, and factories because of low operating and maintenance costs. These systems use the earth as a heat source in heating and a heat sink in cooling mode. Ground heat exchangers are classified by a horizontal and vertical type according to the installation method. Vertical type is usually constructed by placing small diameter high density polyethylene tube in a vertical borehole. Vertical tube sizes range from 20 to 40 mm nominal diameter. Borehole depth range between 100 and 200 m depending on local drilling conditions and available equipment. In this study, to evaluate the performance of single u-tube with bentonite grouting, single u-tube with broken stone grouting and double u-tube bentonite grouting of vertical ground heat exchangers, test sections are buried on the earth and experimental apparatus is installed. Therefore the heat transfer performance and pressure loss of these are estimated.

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ISO performance data based commissioning technique for GSHP system (ISO 성능데이터를 이용한 지열히트펌프 시스템의 성능 확인 커미셔닝 기술)

  • Ko, Gun-Hyuk;Kim, Ji-Young;Kang, Eun-Chul;Chang, Ki-Chang;Lee, Euy-Joon
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.4 no.2
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    • pp.1-7
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    • 2008
  • GSHP(Ground Source Heat Pump) has been extensively disseminated due to the recent increasing demand over new and renewable energy. However, the system reliability has been key issues and barriers to insure a better system performance as designed originally in ISO (international standard organization) standard. This paper introduces a systematic method to verify its intended design target so called as ISO performance data based commissioning technology for a water to air GSHP system. The commissioning technology starts from are to the international standard ISO performance data of a GSHP model and to compare its installed operation data and to calibrate and tune to the target optimum operation parameters. Results indicated that cooling capacity could be raised up to 76.6% from 46.6% from this proposed commissioning technology.

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A Performance Estimation of Ground Source Heat Pump System Used both for Heating and Snow-melting (난방.융설 겸용 지열원 히트펌프시스템의 운전성능 평가)

  • Choi, Deok-In;Kim, Joong-Hun;Hwang, Kwang-Il
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.8 no.1
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    • pp.7-12
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    • 2012
  • This study proposes a hybrid geothermal system combined with heating mode and snow-melting mode for winter season in order to increase the annual operating efficiency of the GSHP(Ground Source Heat Pump). The purpose of this study is to get effectiveness of the hybrid geothermal system by the site experiments. In case of snow-melting only mode, the GSHP COP is 0.7 higher than system COP in average. And in case of hybrid mode, heating GSHP COP is 0.5 higher than snow-melting GSHP COP. And it is also found out that all COP obtained through measurement periods is higher than nominal COPs given by GSHP manufacturer. As a conclusion, it is clear that the proposed hybrid geothermal system is expected as a highly efficient system.

IEA ECBCS Annex 54 Economic Assessment Study of a Fuel Cell Integrated Ground Source Heat Pump Microgeneration System (연료전지 지열히트펌프 마이크로제너레이션 IEA ECBCS Annex 54 경제성 평가 연구)

  • Na, Sun-Ik;Kang, Eun-Chul;Lee, Euy-Joon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.26 no.5
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    • pp.199-205
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    • 2014
  • The integration of FC (Fuel Cell) and GSHP (Ground Source Heat Pump) hybrid system could produce a synergistic advantage in thermal and electric way. This study intends to analyse the economical aspect of a FC integrated GSHP hybrid system compared to the conventional system which is consisted with a boiler and a chiller. Based on the hourly simulation, the study indicated that GSHP system and FC+GSHP hybrid system could reduce the energy consumption on a building. The method of the economic assessment has been based on IEA ECBCS Annex 54 Subtask C SPB(Simple Payback) method. The SPB was calculated using the economic balanced year of the alternative system over the conventional (reference) system. The SPB of the alternative systems (GSHP and FC+GSHP) with 50% initial incentive was 4.06 and 26.73 year respectively while the SPB without initial incentive of systems was 10.71 and 57.76 year.

Study on the Operational Cost and Characteristics of a Hybrid Cooling Plant with a Ground Source Heat Pump (지열 열펌프가 적용된 복합냉방설비의 연계운전 특성 및 운전비용 분석)

  • Jeon, Jong-Ug;Jung, Hae-Won;Lee, Tae-Won;Kim, Yong-Ki;Hong, Dae-Hie;Kim, Yong-Chan
    • Proceedings of the SAREK Conference
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    • pp.42-47
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    • 2008
  • This paper reports the system performance of a hybrid plant, which combines a renewable energy plant of GSHP(Ground Source Heat Pump) with a conventional plant (screw water chiller). To find out operational cost and operating characteristics, the performance of the hybrid system was measured in a building located in Jeju island. Based on the measured data, the operating characteristics were analyzed and the operational cost was estimated by using payment table, which was provided by the Korea Electric Power Cooperation. Operating methods to save energy were recommended.

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A Experimental Study on the Ground Source and Rain Water Heat Source Heat Pump System in Apartment (공동주택 적용 지열 및 우수열원을 이용한 히트펌프의 실험적 연구)

  • Ko, Gun-Hyuk;Kim, Ji-Young;Kang, Eun-Chul;Lee, Euy-Joon;Hyun, Myung-Taek
    • Proceedings of the SAREK Conference
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    • pp.833-837
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    • 2008
  • GSHP(Ground Source Heat Pump) has been extensively disseminated due to the recent increasing demand over new and renewable energy. In this study, the operating performance of rain water and ground source heat pump system (RW-GSHP) was compared with GSHP during the heating test. Leaving load temperature(LLT) was $50^{\circ}C$, $53^{\circ}C$, $56^{\circ}C$, respectively and rain water tank temperature(RWT) was $13^{\circ}C$, $15^{\circ}C$, $17^{\circ}C$ in this heating test. The experiment was focused on comparison of the system operating performance depending on leaving load temperature (LLT) and rain water tank temperature (RWT). The results showed that rain water and ground source heat pump system (RW-GSHP) was higher heating performance and COPh than those of GSHP.

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PVT-GSHP System Economic Evaluation Study with IEA ECBCS Annex 54 Method (IEA ECBCS Annex 54 방법에 근거한 PVT-GSHP 시스템 경제성 평가 연구)

  • Pak, Jin-Woo;Kang, Eun-Chul;Lee, Euy-Joon
    • Journal of the Korean Solar Energy Society
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    • v.34 no.1
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    • pp.64-71
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    • 2014
  • This study is to perform economic analysis of a PVT-GSHP (Photovoltaic Thermal-Ground Source Heat Pump) system compared to the conventional system which consists of a boiler and a chiller. This research has simulated, developed and analyzed four systems for application in a residential and an office building which was based on the hourly EPI (Energy Performance Index, $kWh/m^2yr$). Case 1 includes a boiler and a chiller to meet heating and cooling demands for a house. Case 2 is the same conventional system as Case 1 for a office. Case 3 is simple summation of Case 1 and 2. And Case 4 is utilizing a PVT-GSHP to meet the combined loads of the house and office. The economic evaluation study was based on IEA ECBCS Annex 54 subtasks C economic assessment methods. This study indicated that PVT-GSHP system can save a building's energy up to 53.9%. Also the SPB (Simple Payback) of the PVT-GSHP system with 0%, 50% initial incentive was 14.5, 6.7 year respectively.

An Analytical Study on the Optimal Set-point of the Hybrid Plant (복합열원설비 운전온도 최적 설정에 관한 해석적 연구)

  • Jeon, Jong-Ug;Lee, Sun-Il;Lee, Tae-Won;Kim, Yong-Ki;Hong, Dae-Hie;Kim, Yong-Chan
    • Proceedings of the SAREK Conference
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    • pp.352-357
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    • 2007
  • The objective of this study is to find the optimal set-point of a hybrid Plant, which is combined by renewable energy plant of the GSHP(Ground Source Heat Pump) and the conventional plant(chiller, boiler). The work presented in this study was carried out by using the EnergyPlus(Version 2.0). In order to validate the simulation model, field data were measured from a building. The GSHP was used as a base plant and the conventional plant as the assistant plant. Various temperatures were controlled (zone summer set-point, zone winter set-point, chilled water temperature, hot water temperature) to find the optimal set-point temperature of the system. The influence of the various set-points were analyzed seasonally.

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