• Title/Summary/Keyword: Water source Heat pump

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Performance Characteristics and Economic Assessment of a River Water: Source Heat Pump System (하천수 열원 열펌프 시스템의 성능 특성 및 경제성 평가)

  • Park, Cha-Sik;Jung, Tae-Hun;Park, Hong-Hee;Kim, Yong-Chan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.21 no.11
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    • pp.621-628
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    • 2009
  • The objectives of this study are to analyze the performance of a river water-source heat pump and to carry out economic assessment for the heat pump. The COP of the river water-source heat pump was 3-21% higher than that of the air-source heat pump because river water provides stable operating temperature compared with air temperature throughout the year. The economic analysis was carried out by comparing the initial and operating cost of the river water-source heat pump with those of the conventional air-source heat pump. The ratio of the life cycle operating cost to the life cycle cost increased with the increase of building capacity. The payback period was found to be less than 3.5 years when the capacity of the river water-source heat pump was larger than 10 RT.

Cooling and Heating Operation Characteristics of Raw-water Source Heat Pump and Air Source Heat Pump in Water Treatment Facility (정수장 내 원수열원 및 공기열원 히트펌프의 냉난방 운전 특성)

  • Oh, Sun-Hee;Yun, Rin;Cho, Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.7
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    • pp.386-391
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    • 2013
  • The dynamic characteristics of both raw-water source and air source heat pump utilized in water treatment facilities were investigated by using TRNSYS simulator. The modeling of the raw water source heat pump was verified by the measured data at the Cheongju water treatment facility, and the modeling at the air source heat pump was verified by the data from the Siheung water treatment facility. The average heating and cooling COPs from the raw-water source heat pump were higher than those of the air source heat pump by 19% and 18%, respectively. The power consumptions of the air source heat pump for the cooling and the heating were higher than those of the raw water source heat pump by 28% and 26%, respectively.

Estimation of Greenhouse Heating performance for Ground Filtration Water Source Heat Pump (강변여과수 열원 히트펌프 온실난방 성능시험)

  • Moon, Jongpil;Lee, Sunghyoun;Kwon, Jinkyung;Kang, YounKoo;Lee, Sujang
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.200.2-200.2
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    • 2011
  • This study was carried out in order to estimate the greenhouse performance for Ground filtration water source heat pump which was installed for supplying the heat to the paprika greenhouse in Jinju city. Experimental area of Greenhouse was $3,300m^2$, For keeping the heat from greenhouse, single plastic covering and double thermal screen was installed. With considering all of greenhouse insulation condition and designed heatng temperature, heating capacity for experimental greenhouse was calculated as 320,000kcal/hr. Coefficient of performance(COP) of Ground filtration water source heat pump was gauged and greenhouse heating performance was tested from Febuary 1 to Febuary 28 in 2011. The result showed that COP of heat pump was in the range of 3.7~4.7 and COP of heating system was in the range of 3.0~3.5. The vaule of COP was very high and the temperature inside greenhouse was well corresponded to the setting temperature of greenhouse environment controlling system. lots of Ground filtration water made the the number of well fewer and the expense for installing heating system cheaper than that of geothermal system used custmarily. and this system went beyond the limitation of intaking amount of groundwater in normal Groundwater source heat pump.

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LCC Analysis of a Heat Pump System Using River Water (하천수 열원 이용 열펌프 시스템의 LCC 분석)

  • Han, Sang-Soo;Park, Cha-Sik;Kim, Yong-Chan
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1424-1428
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    • 2009
  • The performance of a heat pump using river water as a heat source was compared with that of a conventional air-conditioner for cooling and a boiler system for heating. The heat pump system using river water considered the 1-stage cycle for cooling and the 2-stage cycle for heating. The COPs of the river water source heat pump were $0.5{\sim}1.1$ higher than those of the conventional system in the cooling season. The LCC of the river water source heat pump system was lower 13.5% and 32.4% than that of the conventional system I and II. In addition, when the initial cost ratios of the river water source heat pump system to the conventional system I and II were less than 1.2 and 1.4, respectively, an acceptable payback was found to be less than 5 years.

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Evaluation of Water Temperature Difference Energy of the Raw Water from Paldang Water Intake Station (수도권 팔당취수장 원수 이용 온도차에너지 부존량 조사)

  • Cho, Yong;Park, Jin-Hoon;Kim, Youngjoon;Park, Tae Jin
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.170.2-170.2
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    • 2010
  • The amount of the heating and cooling energy of water source heat pump using the raw water from the Paldang water intake station is investigated in the study. The Han river water is conveyed in the large-size shallowly buried pipe. Averaged water temperature at the position, 27 km from the Paldang water intake station, is increased by $1.11^{\circ}C$ due to the geothermal energy transfer under the ground, therefore the raw water has more thermal energy than the river water. To estimate of the thermal energy for the raw water, it is assumed that the water source heat pump is used for the heating and cooling ventilation. When $5.0^{\circ}C$ temperature difference energy of the raw water is used in the heat pump system all the year except for the January and February in which $3.0^{\circ}C$ temperature difference energy is used. It is predicted that total 5,766.3 Tcal could be used in the metropolitan area a year, which is about 3.0% of the river water unutilized energy resources.

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A Study on the Variation of Ground Water Temperature for Development of Ground Water Source Heat Pump (지하수 열원 열펌프 개발을 위한 지하수 온도의 변화 특성 연구)

  • Nam Hyun Kyu;Kim Youngil;Seo Joung Ah;Shin Younggy
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.1 no.2
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    • pp.1-6
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    • 2005
  • Ground water source heat pumps are clean, energy-efficient and environment-friendly systems for cooling and heating. Although the initial cost of ground water source heat pump system is higher than that of air source, it is now widely accepted as an economical system since the installation cost can be returned within a short period of time due to its high efficiency. In a ground water source heat pump system, the variation of the ground water temperature is an important factor that influences the system performance. In this study, variation of the ground water temperature of a single well system is studied experimentally for various operating conditions. When ground water flow exists in the underground, the returned water exchanges heat efficiently with the ground and the temperature of the ground water remains nearly constant. Hence the short circuit problem is minimized. If an active flow of ground water flow exists in the underground, a singe well heat pumps system will be free of short circuit problem and can operate with high performance.

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Economical Analysis of a Small Capacity Heat Pump utilizing Heat Sources of Air, Geothermal and Underground Water Tank using Dynamic Simulation (동특성 시뮬레이션을 이용한 공기, 지열 및 지하 저수조 열원 소형 열펌프의 경제성 분석)

  • Yang, Chul-Ho;Kim, Youngil;Chung, Kwang-Seop
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.8 no.4
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    • pp.17-23
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    • 2012
  • Due to reinforcement of international environment regulation and high oil prices, interest in renewable energy is growing. Countries participating in UNFCCC are continuously putting efforts in reducing greenhouse gas after enforcing Kyoto Protocol into effect on Feb, 2005. Energy used in buildings, which relies heavily on fossil fuel accounts for about 24% of total energy consumption. In this study, air, geothermal and water source heat pump systems for an 322 $m^2$ auditorium in an office building is simulated using TRNSYS version 17 for comparing energy consumptions. The results show that energy consumptions of air, geothermal and water source heat pumps are 14,485, 10,249, and 10,405 kWh, respectively. Annual equal payments which consider both initial and running costs become 5,734,521, 6,403,257 and 5,596,058 Won. Thus, water source heat pump is the best economical choice.

Winter Season Performance Characteristics of Raw Water-Source Heat Pump System with a Thermal Storage Tank (원수열원 히트펌프 축열시스템의 동절기 성능분석)

  • Cho, Yong;Lee, Dong Keun
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.202-202
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    • 2011
  • Performance of the raw water-source heat pump system with a thermal storage tank has been analyzed in winter season. The raw water is transferred through the multi-regional water supply system from Han river. Raw water is large temperature difference resource compared with groundwater. Although the raw water temperature drops to $0.6^{\circ}C$ due to the heavy snowfall and the severe cold in late January and early February, 2010, the system has been normally operated without any trouble this winter. The unit COP and system COP considered all pump power consumption were estimated based on the second-by-second data of the all sensors. The monthly averaged unit COP and system COP are 3.37 and 2.76 respectively with $1.4^{\circ}C$ of raw water in January, 3.55 and 2.89 with $1.6^{\circ}C$ raw water in February, 3.82 and 3.15 with $5.4^{\circ}C$ raw water in March. The performance of the system are increased with raw water temperature, and the COPs are higher than the water-to-air heat pump system using relatively high temperature raw water from Daecheong reservoir because the water-to-water system was operated on the full load condition and was stopped when the thermal storage tank was full of the high temperature water.

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Greenhouse Heating Technology Development by using Riverbank Filtration Water (강변여과수를 이용한 온실난방기술 개발)

  • Moon, Jong-Pil;Lee, Sung-Hyoun;Kwon, Jin-Kyung;Kang, Youn-Ku;Ryou, Young-Sun;Lee, Su-Jang
    • Journal of The Korean Society of Agricultural Engineers
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    • v.53 no.6
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    • pp.145-152
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    • 2011
  • In order to heat greenhouse nearby river channel, riverbank filtration water source heat pump was developed for getting plenty of heat flux from geothermal energy. Recharging well, thermal storage tank with separating insulation plate and filtering tank for eliminating iron, manganese were mainly developed for making the coefficient of performance (COP) of heat pump higher. Heating system using riverbank filtration water source heat pump was installed at a paprika greenhouse in the Jinju region where a single fold of vinyl cover and 2 layers of horizontal thermal curtain were installed as a part of temperature keeping and heat insulation with a greenhouse area of 3,185 $m^2$. 320,000 kcal/h was supplied for performing a site application tests. A greenhouse heating test was performed from Feb. 1, 2011 to Apr. 30, 2011. As the result of that, COPh of the heat pump was measured in the range of 4.0~4.5, while COPS of the system was represented as 2.9~3.3. COP measured of the heat pump was very good and well responded to indoor heating temperature of the environment control system of a greenhouse.