• Title/Summary/Keyword: Water source Heat pump

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A Study on the Performance Evaluation of Hybrid Energy System with Geothermal and Solar Heat Sources (지열-태양열원 복합시스템의 성능평가에 관한 연구)

  • Hwang In-Ju;Woo Nam-Sub;Lee Hong-Chul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.3
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    • pp.279-286
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    • 2006
  • The present study concerns the annual performance evaluation of a hybrid-renewable energy system with geothermal and solar heat sources for hot water, heating and cooling of the residential buildings. The hybrid energy system consists of ground source heat pump of 2 RT for cooling, solar collectors of $4.8m^2$, storage tank of 250 liters and gas fired backup boiler of 11.6 kW. The averaged coefficients of performance of geothermal heat pump system during cooling and heating seasons are measured as 4.1 and 3.5, respectively. Also solar fraction for hot water is measured as 35 percent. Overall, the results shows that the hybrid-renewable energy system satisfactorily operated under all climatic conditions.

Heat Transfer Performance of Pond Loop type Heat Exchanger for Ground Source Heat Pump using Extruding Ground Water(2) (유출지하수 열원 지열히트펌프용 Pond Loop형 열교환기의 열전달 성능(2))

  • Park, Geun-Woo;Lee, Eung-Youl
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.15-19
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    • 2006
  • 유출지하수나 지표수를 열원으로 하는 지열히트펌프의 Pond Loop형 열교환기를 개발하기 위하여 미국에서 상용화된 Slim-Jim 열교환기와 본 연구에서 자체설계, 제작한 Pond-loop type의 열교환기를 유동이 없는 유출수조 내에서 수조온도가 변화함에 따라 일정한 열교환기 입구온도를 유지하면서 열전달량의 변화를 측정하였다. 그 결과 유출수를 Heat Source로 사용하는 경우 Slim-Jim에서는 $8,000{\sim}11,000 kcal/hr$의 열량이 전달되었고, 자체 제작한 열교환기에서는 $11,000{\sim}16,000kcal/hr$의 열량이 전달되었다. 유출수를 Heat Sink로 사용할 경우 Slim-Jim에서는 $2,500{\sim}7,000 kcal/h$의 열량이 전달되었고, 자체제작한 열교환기의 경우, $6,800{\sim}14,00 kcal/hr$의 열량이 전달되었다. 측정된 열전달량을 바탕으로 총괄열전달계수를 구한 결과 Slim-Jim 열교환기의 경우 $210{\sim}340 kcal/hr\;m^2{\circ}C$, 자체개발한 열교환기의 경우 $350{\sim}590 kcal/hr\;m^2{\circ}C$로 나타나 자체 개발한 열교환기의 열전달 성능이 비교적 우수함을 입증하였다.

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Heat Transfer Performance of Pond Loop type Heat Exchanger for Ground Source Heat Pump using Extruding Ground Water (유출지하수 열원 지열히트펌프용 Pond Loop형 열교환기의 열전달 성능)

  • Park, Geun-Woo;Kim, Jin-Sang;Lee, Eung-Youl
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.445-450
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    • 2006
  • 유출지하수나 지표수를 열원으로 하는 지열히트펌프의 기초자료로 활용하기 위하여 Pond Loop형 열교환기를 설계, 제작하여 유동이 없는 수조 내에서 수조의 온도가 변화함에 따라 일정한 열교환기 입구온도를 유지하면서 열전달량을 측정하였다. 그 결과 수조를 Heat Source로 사용하는 경우 $5,500{\sim}4,500kcal/h$의 열량이 전달되었고, 수조를 Heat Sink로 사용할 경우 $5,200{\sim}3,500 kcal/h$의 열량이 전달되었다. 또한 열교환기 관내 유속이 증가함에 따라 열전달량이 증가하는 경향성을 확인할 수 있었고, 이는 동시에 열교환기 입출구의 차압을 증가시킴을 알 수 있었다. 열교환기의 설계단계에서 사용하였던 열전달관계식으로 구한총괄열전달계수, U와 실험값을 통해 유추한U값을 비교한 결과 실험에 의해 유추된 U값이 $24{\sim}27%$ 설계치보다 크게 나타났다. 본 연구를 통하여 유출지하수 뿐만 아니라 하수 및 하천수를 이용한 지열히트펌프의 기초자료를 확보할 수 있었다.

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The Analysis of heating performance of heat pump system for agricultural facility using underground air in Jeju area - Focused on the Jeju Area - (제주지역 지하공기를 이용한 농업시설용 히트펌프시스템의 난방 성능 분석 - 제주지역을 중심으로 -)

  • Kang, Youn-Ku;Lim, Tae-Sub
    • KIEAE Journal
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    • v.16 no.6
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    • pp.109-114
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    • 2016
  • Purpose: The underground air is the warm air discharged from the porous volcano bedrock 30-50m underground in Jeju, including excessive humidity. The temperature of the underground air is $15-20^{\circ}C$ throughout the year. In Jeju, the underground air was used for heating greenhouses by supplying into greenhouses directly. This heating method by supplying the underground air into greenhouses directly had several problems. The study was conducted to develop the heat pump system using underground air as heat source for resolving excessive humidity problem of the underground air, adopting the underground air as a farm supporting project by Ministry of Agriculture, Food and Rural Affairs(MAFRA) and saving heating cost for agricultural facilities. Method: 35kW scale(10 RT) heat pump system using underground air installed in a greenhouse of area $330m^2$ in Jeju-Special Self-Governing Province Agricultural Research & Extension Services, Seogwipo-si, Jeju. The inlet and outlet water temperature of the condenser, the evaporator and the thermal storage tank and the underground air temperature and the air temperature in the greenhouse were measured by T type thermocouples. The data were collected and saved in a data logger(MV200, Yokogawa, Japan). Flow rates of water flowing in the condenser, the evaporator and the thermal storage tank were measured by an ultrasonic flow meter(PT868, Panametrics, Norway). The total electric power that consumed by the system was measured by a wattmeter(CW240, Yokogawa, Japan). Heating COP, rejection heat of condenser, extraction heat of evaporator and heating cost were analyzed. Result: The underground air in Jeju was adopted as a farm supporting project by Ministry of Agriculture, Food and Rural Affairs(MAFRA) in 2010. From 2011, the heat pump systems using underground air as a heat source were installed in 12 farms(16.3ha) in Jeju.

A Study on the Performance Characteristics of Water Heat Source Heat Pump System using CO2 Refrigerant (이산화탄소를 사용한 수열원 히트펌프 시스템의 성능 특성에 관한 실험적 연구)

  • Chang, Keun-Sun;Kang, Hee-Jeong;Kim, Young-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.8
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    • pp.3366-3373
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    • 2011
  • In this study, performance characteristics of a water source heat pump system using $CO_2$ as a refrigerant are investigated experimentally. Cooling and heating capacities and COP of the system are analyzed for various system performance variables such as refrigerant charge, expansion valve opening, compressor frequency and internal heat exchanger. Results show that optimum amount of refrigerant charge and expansion valve opening exists at maximum point of COP curve, and cooling capacity increases but COP decreases with the increase of compressor frequency. When the internal heat exchanger is installed, cooling capacity increases about 4.0% whereas heating capacity decreases about 0.89% compared to the case without internal heat exchanger.

The Field Test of Heat Pump Cooling & Heating System using the water-purifying device (수도시설을 이용한 지열냉난방시스템의 실증연구)

  • Hwang, Ki-Sup;Jung, Woo-Sung;Ahn, Young-Sub
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.629-634
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    • 2007
  • The Alternative energy has lately attracted considerable attention due to the high oil price and environment problem. In this study, field test of facility for using the geothermal energy source from water-purifying device was constructed and monitoring devices are installed to estimate the efficiency of this system. Initial installation cost can be saved efficiently by connecting a heat pump system into the existing pumping well in site of water-purifying in Cheongju. One set of monitoring results during summer was presented and analyzed.

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Energy Saving Strategies for Ice Rink using Sea-Water Heat Source Cooling System (해수열원을 이용한 빙상경기장의 에너지절약 방안에 관한 연구)

  • Kim, Samuel;Park, Jin-Young;Park, Jae-Hong
    • Journal of the Korean Solar Energy Society
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    • v.34 no.2
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    • pp.53-59
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    • 2014
  • Ice Rink is energy intensive building type. Concern of energy saving from buildings is one of very important issues nowadays. New and renewable energy sources for buildings are especially important when we concern about energy supply for buildings. Among new and renewable energy sources, use of seawater for heating and cooling is an emerging issue for energy conscious building design. The options of energy use from sea water heat sources are using deep sea water for direct cooling with heat exchange facilities, and using surface layer water with heat pump systems. In this study, energy consumptions for an Ice Rink building are analyzed according to the heat sources of air-conditioning systems; existing system and sea water heat source system, in a coastal city, Kangnung. The location of the city Kangnung is good for using both deep sea water which is constant temperature throughout the year less than $2^{\circ}C$, and surface layer water which should be accompanied with heat pump systems. The result shows that using sea water from 200m and 30m under sea lever can save annual energy consumption about 33% of original system and about 10% of that using seawater from 0m depth. Annual energy consumption is similar between the systems with seawater from 200m and 30m. Although the amount of energy saving in summer of the system with 200m depth is higher than that with 30m depth, the requirement of energy in winter of the system with 200m depth is bigger than that with 30m depth.

Verification Experiment of a Water-to-air Ground Source Multi-heat Pump System (물-공기 지열 멀티형 열펌프 시스템 실증연구)

  • Kim, Cheol-Woo;Kim, Byoung-Kook;Lee, Pyeong-Gang;Lim, Hyo-Jae;Kang, Shin-Hyung;Choi, Jong-Min
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.6 no.1
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    • pp.9-16
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    • 2010
  • The aim of this study is to verify the performance of water-to-air multi-heat pump system with a vertical U-tube GLHX(U-tube system) and a double tube GLHX(double tube system), which were installed in a school building located in Asan. For analyzing the performance of the GSHP system, we monitored various operating da~ including the water temperature of inlet and outlet of the ground heat exchanger, mass flow rate, and power consumption. Daily average COP of the single U-tube system and the double tube system were 4.5 and 4.2 at cooling mode and were 3.5 and 3.8 at heating mode. As a result, We know that performance of water-to-air multi-heat pump unit is reliable at actual condition operated in a part load conditions for all day.

A Study of the Influence of Groundwater Level on the System Performance of Open Loop Geothermal System (지하수 수위가 개방형 지열시스템 성능에 미치는 영향에 관한 연구)

  • Kim, Jinsang;Nam, Yujin
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.9 no.3
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    • pp.1-10
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    • 2013
  • Open loop geothermal heat pumps have great potential where the groundwater resources are sufficient. Performance of open loop geothermal heat pump systems is considered higher than that of ground source heat pumps. Head and power calculation of submersible pumps, heat pump units, and piping are numerically based on regression data. Results shows that the system performance drops as the water level drops, and the lowest flow rates generally achieve the highest system COPs. The highest achievable cooling system COPs become 6.34, 6.12, and 5.95 as the groundwater levels are 5m, 15m, and 25m. The highest heating system COPs also become 4.59, 4.37, and 4.20. Groundwater level and submersible pump selection greatly influence the system performance of open loop geothermal heat pumps. It needs to be analysed during the design process of open loop geothermal heat pump system, possibly with analysis tools that include wide range of pump product data.

Analysis of Performance of Heat Pump System with Flue Gas Heat Recovery through Field Test (실증운전을 통한 배가스 열회수 히트펌프 시스템의 성능 분석)

  • Lee, Seung-Ho;Lee, Gil-Bong;Lee, Young-Soo;Park, Sang-Il;Ko, Chang-Bok;Baik, Young-Jin;Lee, Kwan-Soo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.26 no.1
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    • pp.1-7
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    • 2014
  • A field test of a 70 kW heat pump system with flue gas heat recovery was performed by an experiment at the Korea Institute of Energy Research. The flue gas is exhausted from a 320 RT absorption chiller-heater in the heating season. Using this flue gas, source water of the heat pump is heated by a condensed-type heat exchanger in the chimney. The operating characteristics of the heat recovery heat pump system were analyzed. Based on the results of the experiments, operating maps were obtained, and an optimum operating range is suggested, in which the return and heat source water temperature are $51^{\circ}C$ and $31^{\circ}C$, respectively. Additionally, economic analysis of this system was conducted and about 50% energy cost savings can be expected in the heating season.