• 제목/요약/키워드: Air source heat pump

검색결과 286건 처리시간 0.027초

하천수열원을 이용한 2단압축 열펌프의 난방성능 시뮬레이션 (Simulation on the Heating Performance of a 2-Stage Compression Heat Pump System Using River Water)

  • 박차식;김보현;김용찬;이영수;방기영
    • 설비공학논문집
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    • 제17권11호
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    • pp.1005-1013
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    • 2005
  • The use of river water as a heat source of a heat pump has the advantage in the performance compared to the use of atmospheric air because the temperature variation of river water over the year is relatively small. In this study, the performance of the heat pump system using river water as a heat source was numerically investigated. A simulation model for the 2-stage compression heat pump system was developed with each component model composed of compressors, heat exchangers, a flash tank and electronic expansion devices. The peformance of the heat pump system using river water was improved by $50\%$ compared to that using atmospheric air in winter conditions.

지중열원 열펌프 시스템의 난방성능 해석 (A Study on the Heating Performance of Ground Source Heat Pump System)

  • 우정선;김대기;이세균
    • 설비공학논문집
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    • 제16권12호
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    • pp.1175-1182
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    • 2004
  • 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(COPH) 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 COPH value (COPH > 3) the heat extraction rate should be about 25 W/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.

공랭식 열펌프의 습표면 핀-관 증발기의 현장 성능 시험 (In-Situ Performance Test of a Wet Surface Finned-Tube Evaporator of an Air Source Heat Pump)

  • 백영진;장영수;김영일
    • 설비공학논문집
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    • 제13권9호
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    • pp.818-826
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    • 2001
  • In this study, in-situ performance test of a wet surface finned-tube evaporator of an air source heat pump which has a rating capacity of 20RT is carried out. Since test conditions, such as indoor and outdoor air conditions cannot be controlled to satisfy the standard test conditions, experiments are done with the inlet air conditions as they exist, From the experimental data, air side heat and mass transfer coefficients were calculated by the well known heat and mass transfer analogy and tube-by-tube method. since current procedure underpredicted the experimental sensible heat factor(SHF), a proper empirical parameter was introduced to predict the experimental data with satisfactory results. This study provides the method of evaluating the heat and mass transfer coefficients of a wet surface finned-tube evaporator of which in-situ performance test in necessary.

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Analysis of a Wet Surface Finned-tube Evaporator of an Air Source Heat Pump

  • Baik, Young-Jin;Chang, Young-Soo;Kim, Young-Il
    • International Journal of Air-Conditioning and Refrigeration
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    • 제10권4호
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    • pp.211-219
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    • 2002
  • In this study, in-situ performance test of a wet surface finned-tube evaporator of an air source heat pump which has a rating capacity of 20 RT is carried out. Since test conditions, such as indoor and outdoor air conditions cannot be controlled to satisfy the standard test conditions, experiments are done with the inlet air conditions as they exist. From the experimental data, air side heat and mass transfer coefficients were calculated by the well known heat and mass transfer analogy and tube-by-tube method. Since current procedure underpredicted the experimental sensible heat factor (SHF), a proper empirical parameter was introduced to predict the experimental data with satisfactory results. This study provides the method of evaluating the heat and mass transfer coefficients of a wet surface finned-tube evaporator of which in-situ performance test is necessary.

액분사 사이클을 이용한 공기 열원 열펌프의 사이클 시뮬레이션 (Cycle Simulation of an Air Source Heat Pump Using Liquid Injection)

  • 김욱중;홍용주;남임우;강원일;공용상
    • 설비공학논문집
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    • 제12권3호
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    • pp.244-250
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    • 2000
  • An air source heat pump using liquid injection technique, which can be applied for very low temperature climate, has been simulated to examine the design options. Comparison between the simulation and experiment has been carried out to validate the simulation method. Effects of various design parameters such as liquid injection rate and injection pressure are Investigated to optimize the performance of the heat pump. Finally, optimal liquid infection rate and injection pressure to maintain sufficient heating capacity and moderate discharge refrigerant temperature are suggested when the heat pump was operated at very low outdoor temperature.

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미활용 에너지원으로서의 지하철 배열이용에 관한 연구 (Research on using the exhausted heat from subway tunnel as unused energy)

  • 김종렬;금종수;최광환;윤정인;박준택;김동규;김보철;정용현
    • 설비공학논문집
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    • 제10권6호
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    • pp.695-701
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    • 1998
  • Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was peformed as follows. The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying. The results are summarized as follows; 1) Forced ventilation should be conducted to keep optimal temperature in subway tunnel in summer as well as in winter. According to the simulation, temperature in tunnel was higher than that on the ground in summer when the forced ventilation was conducted only in winter. 2) Ventilating time should be calculated out to the optimal condition for not only saving power of ventilation fan but reusing exhausted heat. By the simulation, it is certain that the exhausted heat should be eliminated in air-conditioning time. 3) The use of exhausted heat source heat pump could save 8% of electric power per hour in comparison with existing heat pump. It was based on a present heat generation and traffic for ventilating time of general air-conditioning, but could be different by ventilating time. 4) As the traffic increases up to 1.5 or 2 times, electric power consumption of the conventional heat pump increases to 11% or 13.5% per mean hour in comparison with that of the exhausted heat source heat pump, though all-day ventilation.

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지역난방용 2단 압축 히트펌프 시스템 성능평가 (Performance Evaluation of a Two-Stage Compression Heat Pump System for District Heating)

  • 박차식;차동안;권오경
    • 설비공학논문집
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    • 제24권7호
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    • pp.585-590
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    • 2012
  • The objective of this study is to investigate the performance of a two-stage compression heat pump system for district heating. The experimental setup of heat pump consists of compressor, condenser, evaporator, expansion device, intercooler, flash tank, oil separator and accumulator. The experimental evaluations on the two-stage compression cycle were carried out under various operating conditions which were heat source temperature, the degree of compressor inlet superheat, and intermediate pressure. The temperature ranges of unutilized energy as the heat source were used in the test conditions. As the heat source temperature increased from $10^{\circ}C$ to $30^{\circ}C$, the COP and heating capacity of the heat pump system increased by 22.6% and 45.8%, respectively. The performance of the two-stage heat pump system increased by 5.2% with the variation of the intermediate pressure in the same heat source temperature conditions.

대형 Community 건물의 연료전지 구동 지열원 히트펌프 냉.난방 시스템 성능에 관한 해석적 연구 (Analytical Study on the Performance of Fuel Cell Driven Ground Source Heat Pump Heating and Cooling System of a Large Community Building)

  • 변재기;정동화;최영돈;조성환
    • 설비공학논문집
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    • 제21권6호
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    • pp.355-366
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    • 2009
  • In the present study, fuel cell driven ground source heat pump system is applied to a large community building and performance of the heat pump system is computationally analyzed. Conduction heat transfer between brine pipe and ground is analyzed by TEACH code to predict the performance of heat pump system. Predicted COP of the heat pump system and the energy cost were compared with variation of the location of the objective building the water saturation rate of soil and the driven powers of heat pump system. Significant reduction of energy cost can be accomplished by employing the fuel cell driven heat pump system in comparison with the late-night electricity driven system. It is due to the low electricity production cost of fuel cell system and the application of recovered waste heat generated during electricity production process to the heating of large community building.

하천수 열원 2단 압축 열펌프시스템의 부분부하 운전특성에 관한 실험적 연구 (An Experimental Study on the Part-Load Performance of a River Water Source 2-Stage Heat Pump)

  • 김지영;백영진;이영수;나호상
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.1964-1968
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    • 2007
  • The river water heat source heat pump has the advantage in the performance compared to air source heat pump. Although its better performance, the large temperature difference between load and source makes system performance worse by nature. In this study, 2-stage compression is considered as the solution of this problem. Generally, heat pump is designed for maximum capacity rate, but it actually operates at part load condition in many cases. Therefore, an information on the part-load character is very important in view of the system overall performance. In this study, part-load performance tests of a R134a 2-stage compression heat pump were carried out over the river water and supply heating water temperature changes. The experimental results show that the system performance is influenced by the part load rates, river water temperature, load temperature, etc.

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공기열원 2중히트싱크 열펌프의 성능해석 (Performance Analysis of Heat Pump System with Air Source Evaporator and Single Unit Dual Sink Condenser)

  • 우정선;이세균;이재효;박효순
    • 태양에너지
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    • 제18권4호
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    • pp.11-22
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    • 1998
  • Floor panel heating system using hot water is the primary heating system of domestic residential building. This paper presents the results of performance analysis of the heat pump system with air source evaporator and single unit dual sink(SUDSk) condenser. The heat exchanger combines two separated condensers into a single condenser and the object of the SUDSk condenser is to release energy to dual sinks, i.e. air for air heating system and water for panel heating system in one single unit. Simulation program is developed for single unit dual source(SUDS) SUDSk heat pump system and some experimental data are obtained and compared with simulation results. Differences of heating capacity and COP in dual source operating mode are 7% and 8% respectively. Simulation results are in good agreement with test results. Therefore, developed program is effectively used for design and performance prediction of dual source dual sink heat pump system with SUDS evaporator and SUDSk condenser.

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