• 제목/요약/키워드: 4way 히트펌프

검색결과 6건 처리시간 0.025초

제어 방식에 따른 지열 히트펌프 시스템의 성능 시뮬레이션 (Performance Simulation of Geothermal Heat Pump (GHP) System with Different Control Schemes)

  • 이두영;최재호;민경천;손병후
    • 대한기계학회논문집 C: 기술과 교육
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    • 제4권1호
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    • pp.35-41
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    • 2016
  • 지열 히트펌프 시스템에서 히트펌프 등 시스템 구성 요소의 에너지 소비량을 효율적으로 관리하면, 냉난방 성능을 더 높일 수 있다. 본 논문은 외기온도 제어 방식이 지열 시스템의 성능에 미치는 영향을 분석하였다. 또한 분석 결과를 현재 국내에서 주로 적용하는 제어 방식(Control-A)과 비교하였다. 이를 위해 상용 소프트웨어(TRNSYS 17)를 이용하여 가상 지열 시스템의 모델을 구축한 후, 시뮬레이션을 수행하였다. 외기 온도 제어 방식(Control-B)은 버퍼 탱크의 온도를 외기 온도에 따라 제어하기 때문에, 간절기 때 효과적이었다. 기존 제어 방식과 비교했을 때, 외기 온도 제어 방식은 히트펌프 전력 소비량을 7.7%(147 kWh 절감) 그리고 순환펌프 전력 소비량을 7.5%(28.1 kWh 절감) 줄일 수 있었다.

환기시스템이 적용된 히트펌프의 난방시 급기효율 평가에 관한 연구 (A Study on the Evaluation of Air Change Efficiency of Multi-Air-Conditioner with Ventilation System for Heating Season)

  • 권용일;한화택;김경환;정백영;이감규
    • 설비공학논문집
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    • 제17권1호
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    • pp.56-61
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    • 2005
  • Indoor air quality becomes of a concern recently in view of human health. This study investigates the air diffusion performance and the air change efficiency of a classroom, when outdoor air is introduced in addition to the heating/cooling operation of a ceiling-mounted heat pump. A CFD analysis has been performed to investigate the effect of the discharge angle of the air jets from the heat pump for both parallel and series types of outdoor air system. It is observed that the series type creates more uniform indoor environment compared to the parallel type in general. It can be concluded the discharge angle should not be larger than 40o for the parallel type, in order not to generate thermal stratification in the room.

히트펌프 냉·난방 시스템의 온도 자동제어에 관한 연구 (A Study for Automatic Temperature Control of the Heating-Cooling System with Heat Pump)

  • 구창대
    • 한국산업융합학회 논문집
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    • 제14권4호
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    • pp.143-149
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    • 2011
  • The experiment has been investigated the room temperature change under adjusting 4-way valve which was installed for cooling and heating switch. Beside, the temperature of heat pump was controlled automatically for autonomously adjusting temperature and maintaining a constant room temperature. As results, Inlet & outlet temperature differences of compressor are $95^{\circ}C$ in cooling condition and $57^{\circ}C$ in heating condition. Therefore, Compression efficiency of cooling effect is higher than heating effect. In addition, Heat exchange effect of Cooling system condition is higher than heating system. This results can be used for studying about automatic temperature control of cooling and heating system with heat pump and 4way valve.

연료전지 지열히트펌프 마이크로제너레이션 IEA ECBCS Annex 54 경제성 평가 연구 (IEA ECBCS Annex 54 Economic Assessment Study of a Fuel Cell Integrated Ground Source Heat Pump Microgeneration System)

  • 나선익;강은철;이의준
    • 설비공학논문집
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    • 제26권5호
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    • pp.199-205
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    • 2014
  • The integration of FC (Fuel Cell) and GSHP (Ground Source Heat Pump) hybrid system could produce a synergistic advantage in thermal and electric way. This study intends to analyse the economical aspect of a FC integrated GSHP hybrid system compared to the conventional system which is consisted with a boiler and a chiller. Based on the hourly simulation, the study indicated that GSHP system and FC+GSHP hybrid system could reduce the energy consumption on a building. The method of the economic assessment has been based on IEA ECBCS Annex 54 Subtask C SPB(Simple Payback) method. The SPB was calculated using the economic balanced year of the alternative system over the conventional (reference) system. The SPB of the alternative systems (GSHP and FC+GSHP) with 50% initial incentive was 4.06 and 26.73 year respectively while the SPB without initial incentive of systems was 10.71 and 57.76 year.

양방향 설정온도 제어에 따른 지중연계 히트펌프 시스템의 에너지 절감량 평가 연구 (Two Way Set Temperature Control Impact Study on Ground Coupled Heat Pump System Energy Saving)

  • 강은철;이의준;민경천
    • 한국지열·수열에너지학회논문집
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    • 제10권2호
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    • pp.7-12
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    • 2014
  • Government has recently restricted heating and cooling set temperatures for the commercial and public buildings due to increasing national energy consumption. The goal of this paper is to visualize a future two way indoor set temperature control impact on building energy consumption by using TRNSYS simulation modeling. The building was modelled based on the twin test cell with the same dimension. Air source ground coupled heat pump performance data has been used for modeling by TRNSYS 17. Daejeon weather data has been used from Korea Solar Energy Society. The heating set temperature in the reference room is $24^{\circ}C$ as well as the target room set temperature are $23^{\circ}C$, $22^{\circ}C$, $21^{\circ}C$ and $20^{\circ}C$. The cooling set temperature of the reference room is also $24^{\circ}C$ as well as the target room set temperature of $25^{\circ}C$, $26^{\circ}C$, $27^{\circ}C$ and $28^{\circ}C$. For the air source heat pump system, heating season energy consumption is $35.52kWh/m^2y$ in the reference room. But the heating energy consumption in the target room is reduced to 7.5% whenever the set temperature decreased every $1^{\circ}C$. The cooling energy consumption in the reference room is $4.57kWh/m^2y$. On the other hand, the energy consumption in the target room is reduced to 22% whenever the set temperature increased every $1^{\circ}C$ by two way controller. For the geothermal heat pump system, heating energy consumption in the reference room is reduced to 20.7%. The target room heating energy consumption is reduced to 32.6% when the set temperature is $22^{\circ}C$. The energy consumption in the target room is reduced to 59.5% when the set temperature is $26^{\circ}C$.

R410A를 이용한 브레이징 타입 판형열교환기에서 물 측 유동방향에 따른 응축/증발 성능 평가 (An Experimental Study on Evaporation/Condensation Heat Transfer with Flow Direction in Brazed Plate Heat Exchanger using Refrigerant 410A)

  • 이성우;정영만;이재근;이동혁
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.1096-1101
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    • 2009
  • The plate heat exchanger(PHE) in heat pump has two flow streams of the refrigerant and water. The flow direction of the refrigerant, unlike that of water, can be changed by a 4-way valve depending on operating condition. Therefore the flow arrangement is a parallel flow for heating and a counter flow for cooling, respectively. In this study, the effects of the flow direction of the water on the heat transfer rate are investigated experimentally. The experiments are carried out for brazed plate heat exchangers under a parallel and counter flow conditions in evaporation and condensation. The experimental parameters in this study include the mass flux of the refrigerant 410A from 3 to $14\;kg/m^2s$ and the flow patterns for the pressure of PHE fixed at 0.97 and 2.46 MPa. The results show that both the heat transfer rate and frictional pressure drop across the PHE increase with the mass flux. The heat transfer rate of the refrigerant 410A for evaporation show great sensitivity to flow direction of the water. The heat transfer rate for evaporation with a counter flow are 5-30% higher than that with a parallel flow.

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