건물일체형 지열히트펌프시스템의 난방 성능 분석

Jin Shangzhen,이진욱(Lee Jin-Uk),김태연(Kim Taeyeon),이승복(Leigh Seung-Bok) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3

Ground source heat pump is a central heating and cooling system that pumps heat to or from the ground. Building Integrated Geothermal system used in this experiment is one of the Ground Source Heat Pump Systems which utilize energy pile. The purpose of this study is to evaluate heating performance of the system. The building is a low-energy experiment apartment in Yonsei University Songdo Campus and the subject is one of the energy reduced houses in this apartment. In the experiment, indoor temperature, outdoor temperature and the inlet and outlet temperature of ground heat exchanger and subject model, were measured. Then the heat pump ' Coefficient of performance(COP) of the heat pump was calculated . As a result, the COP of heat pump is 4-5. Although the depth of the ground heat exchanger in this experment is shallower than usual heat exchanger, the result of heating performance of this system was good as well.

지열원 시스템 히트펌프의 냉방 성능 특성에 관한 실증 연구

임효재(Hyo-Jae Lim),강신형(Shin-Hyung Kang),최재호(Jae Ho Choi),최종민(Jong Min Choi),문제명(Jemyung Moon),권영석(Youngseok Kwon),권형진(HyungJin Kwon),김록희(RockHee Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2

Recently, small and medium-sized buildings have employed a multi-heat pump. The major benefits of the mulit-heat pump over a conventional system are that it is easier system to maintain along with a diversification of facility use, and high comfortability. The performance of multi-heat pump systems can be enhanced by using geothermal energy instead of air source energy. This paper describes the multi-heat pumps applied in an ground source heat pump system for an actual building. The performance of a ground source multi-heat pump installed in the field was investigated in cooling mode. The maximum COP of the systems with single U-tube and double tube ground loop heat exchangers were 6.6 and 6.0, respectively. It is suggested that the new algorithms to control the flow rate of secondary fluid for ground loop heat exchanger have to be developed in order to enhance the performance of the system.

하이브리드 지중열교환기 적용 히트펌프 시스템의 냉방 성능 분석

손병후 한국 지열 · 수열에너지학회 2018 한국지열에너지학회논문집 Vol.14 No.4

This paper presents the cooling performance analysis results of a ground-source heat pump(GSHP) system using hybrid ground heat exchanger (HGHE). In this paper, the HGHE refers to theground heat exchanger (GHE) using both a vertical GHE and a surface water heat exchanger (SWHE). In order to evaluate the system performance, we installed monitoring sensors for measuring temperaturesand power consumption, and then measured operation data with 4 different load burdened ratios of thehybrid GHE, Mode 1~Mode 4. The measurement results show that the system with HGHE mainlyoperates in Mode 1 and Mode 2 over the entire measurement period. The average cooling coefficientof performance (COP) for heat pump unit was 5.18, while the system was 2.79. In steady state, theheat pump COP was slightly decreased with an increase of entering source temperature. In addition,the parallel use of SWHE and VGHE was beneficial to the system performance; however, furtherresearch are needed to optimize the design data for various load ratios of the HGHE.

저에너지주택의 지열히트펌프시스템 냉ㆍ난방 성능분석

백남춘(Namchoon Baek),김성범(Sungbum Kim),신우철(Ucheul Shin) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.10

A ground source heat pump system maintains a constant efficiency due to its stable heat source and radiant heat temperature which provide a more effective thermal performance than that of the air source heat pump system. As an eco-friendly renewable energy source, it can reduce electric power and carbon dioxide. In this study, we analyzed one year of data from a web based remote monitoring system to estimate the thermal performance of GSHP with the capacity of 3RT, which is installed in a low energy house located in Daejeon, Korea. This GSHP system is a hybrid system connected to a solar hot water system. Cold and hot water stored in a buffer tank is supplied to six ceiling cassette type fan coil units and a floor panel heating system installed in each room. The results are as follows. First, the GSHP system was operated for ten minutes intermittently in summer in order to decrease the heat load caused by super-insulation. Second, the energy consumption in winter where the system was operated throughout the entire day was 7.5 times higher than that in summer. Moreover, the annual COP of the heating and cooling system was 4.1 in summer and 4.2 in winter, showing little difference. Third, the outlet temperature of the ground heat exchanger in winter decreased from 13℃ in November to 9℃ in February, while that in summer increased from 14℃ to 17℃ showing that the temperature change in winter is greater than that in summer.

연료전지 구동 지열원 히트펌프 냉ㆍ난방 시스템 성능에 관한 해석적 연구

정동화(Dong Hwa Jeong),변재기(Jae Ki Byun),최영돈(Young Don Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

In the present study, the simulation for the annual operation of the fuel cell driven ground source heat pump system is conducted to provide the material to appraise the possibility of application of this system. The large building equipped with a heat pump system is selected as the subject of the simulation. Large buildings have the economical advantage using heat pump systems due to large load of heating and cooling. The COP for this system is affected by the load of heating and cooling and the heat source temperature. The load of heating and cooling varies with the location and direction of the building. And the operation for a long period brings about the ground temperature variation. The results show the COP variation in various conditions and operating costs of the fuel cell driven ground source heat pump system.

Barrette 파일을 이용한 지열시스템의 채열 성능 예측 및 경제성 분석에 관한 연구

채호병(Ho-Byung Chae),남유진(Yujin Nam),박용부(Yong-Boo Park) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.11

Ground source heat pump systems (GSHP) can achieve higher performance of the system, by supplying more efficient heat source to the heat pump, than the conventional air-source heat pump system. But building clients and designers have hesitated to use GSHP systems, due to expensive initial cost, and uncertain economic feasibility. In order to reduce the initial cost, many researches have focused on the energy-pile system, using the structure of the building as a heat exchanger. Even though several experimental studies for the energy-pile system have been conducted, there was not enough data of quantitative evaluation with economic analysis and comprehensive analysis for the energy-pile. In this study, a prediction method has been developed for the energy pile system with barrette pile, using the ground heat transfer model and ground heat exchanger model. Moreover, a feasibility study for the energy pile system with barrette pile was conducted, by performance analysis and LCC assessment. As a result, it was found that the heat exchange rate of a barrette pile was 2.55 kW, and the payback period using LCC analysis was 8.8 years.

Study on the Operation of the Solar Heating System with Ground Source Heat Pump as a Back-up Device

김휘동(Kim, Hwidong),백남춘(Baek, Namchoon),이진국(Lee, Jinkook),신우철(Shin, Uchul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06

The study on the operation characteristics of solar space and water heating system with ground source heat pump (GSHP) as a back-up device was carried out. This system, called solar thermal and geothermal hybrid system (ST/G), was installed at Zero Energy Solar House II (KIER ZeSH-II) in Korea Institute of Energy Research. This ST/G hybrid system was developed to supply all thermal load in a house by renewable energy. The purpose of this study is to find out that this system is optimized and operated normally for the heating load of ZeSH-II. Experiment was continued for seven months, from October to April. The analysis was conducted as followings ; - the contribution of solar thermal system. - the appropriateness of GSHP as a back-up device. - the performance of solar thermal and ground source heat pump system respectively. - the adaptation of thermal peak load - the operation characteristics of hybrid system under different weather conditions. Finally the complementary measures for the system simplification was referred for the commercialization of this hybrid system.

지중열원 열펌프 시스템의 난방성능 해석

우정선,김대기,이세균 대한설비공학회 2004 설비공학 논문집 Vol.16 No.12

Installations of vertical boreholes for the ground source heat pump system are expensive to install. One way to reduce the initial cost is to increase the specific heat extraction rate of borehole system. However, as the specific heat extraction rate increases the temperature of borehole fluid decreases with the resultant lower Coefficient Of Performance in Heating() of heat pump system. The purpose of this study is to provide the basic informations about the performance of heat pump system with the specific heat extraction rate and soil thermal properties such as thermal conductivity and temperature. It is shown that the specific heat extraction rate is the most important parameter for the ground source heat pump system. To obtain the reasonable value(>3) the heat extraction rate should be about 25W/m or less. Accurate measurements of soil thermal properties are also very important to design the system properly. The effects of borehole thermal resistances are also examined in this study.

업무용 건물의 지열 히트펌프 시스템에 대한 성능 예측

손병후(Byonghu Sohn),권한솔(Han Sol Kwon) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.9

Ground-source heat pump (GSHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy efficiency. These systems use the ground as a heat source and the heat sink for cooling mode operation. The purpose of this simulation study is to evaluate the performance of a hypothetical GSHP system in an office building and to assess the energy saving effect against the existing HVAC systems (boiler and turbo chiller). We collected monthly energy consumption data from an actual office building (32,488 m2) in Seoul, and created a model to calculate the hourly building loads with EnergyPlus. In addition, we used GLD (Ground Loop Design) V8.0, a GSHP system design and simulation software tool, to evaluate hourly and monthly performance of the GSHP system. The energy consumption for the GSHP system based on the hourly simulation results were estimated to be 582.6 MWh/year for cooling and 593.2 MWh/year for heating, while those for the existing HVAC systems were found to be 674.5 MWh/year and 2,496.4 MWh/year, respectively. The seasonal performance factor (SPF) of the GSHP system was also calculated to be in the range of 3.37∼4.28.

태양열 및 지중열원을 이용한 히트펌프 시스템의 최적이용법에 관한 연구

남유진(Yujin Nam) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.6

In this research, a heat pump system with a heat source network is suggested which utilizes solar heat and ground heat as heat source for cooling and heating. This paper describes the summary of the suggested system and the results of the annual energy simulation. The heating and cooling loads, the electric consumption and the COP were calculated by TRNSYS 16 and evaluated in the cases of different local conditions and different system compositions. In the results, the superiority of the suggested system has been quantitatively evaluated comparing with the conventional heat pump system using one heat source. Furthermore, it was more significant in cold climate, in which the heating COP was 146% increased compared the air source heat pump system, than it in subtropical climate, 119% increased.