• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.405-408
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• 2009

공기열원 히트펌프시스템의 문제점, 즉 열효율, 안정성, 착상에 대한 현황을 파악하고 이를 해결하기 위한 연구를 수행하였다. 열효율과 안정성을 위해 기존 시스템을 보완한 8행정 냉매사이클시스템 개발과 제어시스템의 개발을 통해 히트펌프 시스템의 효율을 2배 정도 증가시키고, 안정성을 높이며, 착상 문제를 최소화할 수 있도록 하였다. 개발된 공기열원 히트펌프시스템의 COP는 평균 5정도이고, 안정적으로 운용되는 외부 온도는 $-10^{\circ}C$에서 $55^{\circ}C$까지이다. 토출되는 온수의 온도는 $50{\sim}60^{\circ}C$정도이다. 평균 제상시간은 1분 이내이다. 앞으로 개발해야 할 문제는 외부 온도 $-10^{\circ}C$ 이하지역에서 보조열원 없이 난방을 할 수 있고 친환경 냉매를 사용하며 COP가 7이상인 고효율 히트펌프시스템를 실용화하는 것이다.

• Korea Journal of Geothermal Energy
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• v.8 no.1
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• pp.15-25
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• 2012

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.73-77
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• 2019

In this paper, the heat pump system was designed using heat absorption of the refrigerant or condensation heat. The cooperation system has been developed to pass a heat source of low temperature to a high temperature or to pass the heat source of high temperature to a low temperature. Heat pump for using the valve as a function of switching a condenser and an evaporator in a refrigerating cycle. As a result, heat pump system was developed by air source method. Therefore cooperating system for energy saving to solve at the same time as the cooling and heating by system of one was equipped.

• Journal of the Korean Institute of Gas
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• v.4 no.4 s.12
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• pp.13-19
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• 2000

Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was performed 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.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.81-81
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• 2011

본 연구는 $CO_2$를 냉매로 하는 급탕용 히트펌프 성능특성을 평가하는 시험 평가법에 대하여 국내 실정에 맞는 시험평가법을 개발하기 위한 목적으로 기존 $CO_2$ 급탕용 히트펌프의 평가방법을 분석하고자 한다. 현재 $CO_2$ 급탕기 또는 급탕용 히트펌프 제품은 일본에서 2000년 초반부터 에코큐트라는 제품으로 일본 급탕용 난방기기로 판매되고 2009년을 기초로 누적판매 대수가 150만대에 이르고 있다. 국내에는 2008년 후반부터 공기열원 또는 폐열원 등을 이용한 급탕용 히트펌프 제품이 일부 수입되어 목욕탕, 찜질방과 같은 숙박업소용으로 판매되고 있는 추세이다. 국내에서는 급탕용 열펌프의 제품의 정의가 아직 정립되지 않고 이에 대한 시험평가방법이 전무한 실정이기 때문에 현재 일본의 가정용 열펌프 급탕기의 규격을 토대로 실제 급탕용 열펌프의 시험을 수행하여 급탕용 히트펌프의 급탕성능특성을 평가하는 방법을 개발하고자 한다. 시험시료는 일본에서 판매되고 있는 급탕용 히트펌프(D사) 제품을 이용하였으며, 현재 일본에서 사용하고 있는 JRA4050 규격에 의해 급탕성능평가를 진행하고 급탕성능평가 지표 등을 국내 유사조건과 급탕성능특성의 평가방법을 비교분석하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.7
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• pp.563-568
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• 2016

In this study, experiments were conducted to evaluate the performance of a heat pump system. A heat pump system with an air as heat source is adapted as reference. The developed system uses a plate heat exchanger an evaporator to absorb heat from a stack of fuel cell driven electric vehicles. Hence, the system functions as a water source heat pump system. The results indicated that the; power consumption increased with the rotational speed of the compressor. A system performance($COP_h$) of 2.03 at an electronic expansion valve(EEV) openings of 25% and a compressor speed of 1200 rpm was observed in the reference system. However, at the same compressor speed, the $COP_h$ of the water source heat pump system corresponded to 9.42 at an EEV openings of 75%. It was found that the water source heat pump system exhibited the highest performance at a water temperature of $50^{\circ}C$.

• 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.

• New & Renewable Energy
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• v.4 no.3
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• pp.23-35
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• 2008

In the present study, performances of fuel cell driven compound source hybrid heat pump system applied to a large community building are simulated. Among several renewable energy sources, ground, river, sea, and waste water sources are chosen as available alternative energies. The performance and energy cost are varied with the hybrid heat pump sources. The system design and operation process appropriate for the surrounding circumstance guarantee the high benefit of the heat pump system applied to a large community building. Th system is driven by fuel cell system instead of the late-night electricity due to the advantages of the low energy cost and waste heat with high temperature.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.41 no.10
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• pp.14-20
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• 2012

• Journal of ILASS-Korea
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• v.29 no.3
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• pp.124-133
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• 2024

Heat pumps play a crucial role in achieving the 2050 Net-Zero targets in many countries worldwide. This study addresses this issue by modifying simulation conditions and selecting relevant cases to determine optimal COP conditions using Simulink. By analyzing the efficiency of heat pump heating, utilizing Simulink models provided by MATLAB, and evaluating economic feasibility, we aim to identify the key factors influencing heat pump performance, including the heat source type, refrigerant, heating set temperature, and piping. Our goal is to establish optimal conditions for maximizing the efficiency of these eco-friendly systems while considering economic factors. In this study, it was confirmed that the heat exchanger flow arrangement of the air-source heat pump using R407c was set to cross-flow, and the diameter of the heat exchanger inner tube was set to 0.95 times the existing size, which was found to be optimal for maximizing efficiency. The COP was approximately 4.07 under these conditions.