• 제목/요약/키워드: Heat pump

검색결과 1,218건 처리시간 0.239초

지열원 히트펌프 시스템의 최적 설계 기법 연구 (Study on the Optimum Design of Ground Source Heat Pumps)

  • 최종민
    • 한국지열·수열에너지학회논문집
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    • 제14권4호
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    • pp.35-42
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    • 2018
  • Among the various ground source heat pump systems, vertical-type heat pump systems have been distributed greatly. Most of the vertical-type ground source heat pump systems have been designed based on the Korean Ministry of Knowledge Economy Announcement in Korea. In this study, the design process of the vertical-type ground source heat pump system in the announcement was analyzed, and the effects of the design parameters on the ground loop heat exchanger were investigated. Borehole thermal conductivity was the highest dominant design parameter for ground loop heat exchangers. The borehole thermal conductivity was changed according to the pipe and grout thermal conductivity. For optimal design of the ground heat pump system, it is highly recommended that the design process in the announcement will be revised to adopt the various tubes and grout which have higher thermal conductivity. In addition, the certification standard for heat pump unit should be revised to develop the heat pump with a small flow rate.

유출지하수열원 지열히트펌프의 냉난방성능 (Cooling and Heating Performance of Ground Source Heat Pump using Effluent Ground Water)

  • 박근우;남현규;강병찬
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2007년도 동계학술발표대회 논문집
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    • pp.434-440
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    • 2007
  • The Effluent ground water overflows in deep and broad ground space building. Temperature of effluent ground water is in 12$\sim$18$^{\circ}C$ annually and the quality of that water is as good as living water. Therefore if the flow rate of effluent ground water is sufficient as source of heat pump, that is good heat source and heat sink of heat pump. Effuent ground water contain the thermal energy of surrounding ground. So this is a new application of ground source heat pump. In this study open type and close type heat pump system using effluent ground water was installed and tested for a church building with large and deep ground space. The effluent flow rate of this building is 800$\sim$1000 ton/day. The heat pump capacity is 5RT each. The heat pump system heating COP was 3.0$\sim$3.3 for the open type and 3.3$\sim$3.8 for the close type system. The heat pump system cooling COP is 3.2$\sim$4.5 for the open type and 3.8$\sim$4.2 for close type system. This performance is up to that of BHE type ground source heat pump.

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지열 이용 히트펌프 시스템의 열성능 해석 (Analysis of Thermal Performance of Ground-Source Heat Pump System)

  • 신우철;백남춘;김욱중;고득용
    • 한국태양에너지학회 논문집
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    • 제26권2호
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    • pp.95-101
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    • 2006
  • The purpose of this study is to present the simulation results and an overview of the performance assessment of the Ground-Source Heat Pump(GSHF) system. The calculation was performed for two design factors: the spacing between boreholes and the depth of the vertical ground heat exchangers. And the simulation was carried out using the thermal simulation code TRNSYS with new model of water to water heat pump developed by this study. As a result, it was anticipated that the yearly mean COPs of heat pump for heating and cooling are about 3.7 and 5.8 respectively and the heat pump can supply 100% of heating and cooling load all the year around.

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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지열히트펌프의 작동시간 경과에 따른 COP 변화에 대한 연구 (Study on COP Variations with the duration of Ground Source Heat Pump Systems Operation)

  • 이용규;백남춘;윤응상
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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    • pp.198.2-198.2
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    • 2010
  • In this study, the COP variation with the duration of Ground Source Heat Pump (GSHP) systems operation was analyzed by experiment. This experimental facility was installed in residential house as a back-up device of solar thermal heating system. The capacity of heat pump is 2.5 kW with a vertical bore hole of 150m depth. The COP of GSHP is varied, depending on the ground temperature which is used as a heat source. The ground heat source temperature influencing heating COP is the soil or rock temperature which adjoin with geo-source heat exchanger. This temperature is decreased rapidly according to the operation duration of heat pump. As a result, COP of GSHP is decreased to 3 in one hour of continuous operation time.

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엔진구동 지열 열펌프의 성능 분석(II) - 소형 증기압축식 열펌프의 성능 분석 - (Performance Analysis of an Earth Coupled Heat Pump System Operated by an Engine(II) - Performance Analysis of a Vapour Compression type Compact Heat Pump -)

  • 김영복;송대빈;손재길
    • Journal of Biosystems Engineering
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    • 제24권6호
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    • pp.501-512
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    • 1999
  • In this study, the coefficient of performance of a vapour compression heat pump system was analyzed for the evaluation of the heat pump performance. A water-to-air heat pump was assembled and tested by changing the level of the compressor driving speed and the air mass flow rate during air heating process. The coefficient of performance for air heating was 2.6~3.8 and that for water cooling was 1.0~1.4. The coefficient of performance was not depending on the levels of the compressor driving speed or levels of the air mass flow rate, but on the temperature of the air and water. The coefficient of performance for air heating increased by about 0.2 with the water temperature increasing by 1$^{\circ}C$.

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저온측과 고온측 냉매간 열교환이 열펌프의 성능특성에 미치는 영향 (Effect of the Heat Exchange between Low and High Temperature Refrigerant on the Heat Pump Performance)

  • 이건중;송현갑
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 1999년도 동계 학술대회 논문집
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    • pp.211-218
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    • 1999
  • The ambient air is commonly used as low-temperature heat sources for heat pump operation. However, the coefficient of performance (COP) of the air -water heat pump is decreased with the ambient air temperature drop. In this study to solve this problem , the AVACTHE(Automatic Variable Area Capillary Type Heat Exchanger) with 3 levels of heat exchange area(0, 1495.4, 1794.5$\textrm{cm}^2$) was installed in the refrigerant circuit of the heat pump. The AVACTHE effect on the performance of heat pump was tested with the ambient air temperature variation. The high level COP of the heat pump could be achieved by the AVACTHE installation when below -5$^{\circ}C$ of the ambient air temperature.

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지열 이용 열펌프 시스템의 열성능 해석 (Analysis of Thermal Performance of Ground-Source Heat Pump System)

  • 고득용;신우철;백남춘;김욱중
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2005년도 동계학술발표대회 논문집
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    • pp.167-172
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    • 2005
  • The purpose of this study is to present the simulation results and an overview of the performance assessment of the Ground-Source Heat Pump(GSHP) system. The calculation was performed for two design factors. the spacing between boreholes and the depth of the vertical ground heat exchangers. And the simulation was carried out using the thermal simulation code TRNSYS with new model o( water to water heat pump developed by this study. As a result, it was anticipated that the yearly mean COPs of heat pump for heating and cooling are about 3.7 and 5.8 respectively and the heat pump can supply 100% of heating and cooling load all the year around.

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VRF 응용 Hybrid 공조시스템 Case Study (Case Study of Hybrid HVAC system Applied VRF)

  • 김성실;박완규;허인구
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2008년도 하계학술발표대회 논문집
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    • pp.357-362
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    • 2008
  • The present study has been conducted variable refrigerant flow system applied building. Multi air-conditioning system has some benefits : easier building management and maintenance and energy saving. Recently, the system heat pump has been employed in medium-sized and tall buildings. However, the performance data and design method for system heat pump are limited in literature due to complicated system parameters and operating conditions. In the present study, case study of a system heat pump applied various building. The aim of this paper is to application multi air-conditioners and to inform the benefits of multi air-conditioners.

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3실형 인버터 열펌프 시스템의 냉방성능 측정 (Cooling Performance Measurement of a 3 Room Type Inverter Heat Pump System)

  • 정광진;최영돈;장효환;송재복;박윤철
    • 설비공학논문집
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    • 제13권6호
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    • pp.431-439
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    • 2001
  • Recently, multi-room type heat pump system has aroused much attention, because it can achieve much reduction of installation cost and space as well as energy saving in companion with the single room type heat pump system. In the present study, performance characteristics of a 3 room type inverter driven heat pump system, which is widely spread in Japanese market, are measured.. In the single room operation, performances of a heat pump system such s the difference of compressor outlet and inlet pressures and the mass flowrate may increase with the increase of cooling capacity so that COP of the system decrease with the increase of cooling capacity. However, in the 2 room operation, mass flowrate and COP of the total system increase markedly as compared with the single room operation.

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