• Title/Summary/Keyword: Heat pump

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Study on the Performance of Fuel Cell Driven Compound Source Heat Pump System to a Large Community Building (대형 Community 건물의 연료전지 구동 복합열원 하이브리드 히트펌프 시스템 성능에 관한 해석적 연구)

  • Jeong, Dong-Hwa;Byun, Jae-Ki;Choi, Young-Don;Cho, Sung-Hwan
    • 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.

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A Third-order Simulation Model of a Vuilleumier Cycle Heat Pump

  • Kang, Young-Goo;Jeong, Eun-Soo
    • International Journal of Air-Conditioning and Refrigeration
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    • v.6
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    • pp.80-92
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    • 1998
  • A third-order simulation model of a Vuilleumier{VM) heat pump has been developed. This model takes into account the major losses such as the heat conduction losses through regenerators and displacers, the pumping losses and the wall-to-gas heat transfer losses in active volumes, in addition to the heat exchanger and regenerator losses. The working volume was divided into 12 control volumes and the conservation equations of mass and energy were applied to each control volume. Pressure drops were considered in regenerators only. Thermodynamic behavior of the working gas in a VM heat pump was investigated and effects of the major losses and operating conditions on the performance of a VM heat pump were shown.

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The Energy Consumption Characteristics of Building Accordance with Air-Conditioning and Heating System (건축물 냉.난방 시스템에 따른 에너지 소비 특성 -서울 소재 A 대학교 건축물을 중심으로-)

  • Park, Kang-Hyun;Cha, Jung-Hoon;Kim, Su-Min
    • 한국태양에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.333-337
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    • 2011
  • Central control air-conditioning systems are being replaced with individually controlled air-conditioning system in the university. The amount of growth of electricity consumption is due to the increasing demand of electric heat pump. In winter and summer, the energy consumption showed a tendency to increase. On the other hand, showed less energy in spring and autumn. Increase the amount of electricity than the degree of decline in gas consumption was higher. Can be considered as transitional phenomena. Because electric heat pump, gas driven heat pump and the absorption chiller-heater are used at the same time in some of the buildings.

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A Study on the description of Horizontal Geothermal Heat pump Type on Small Residential House (소규모 주택에 대한 수평형 지열 히트펌프 형태 결정에 관한 연구)

  • Yun, Jang-Ryeol;Cho, Sung-Woo;Choi, Jung-Min
    • 한국태양에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.328-332
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    • 2011
  • The conclusion is derived from the arranged results and using a simulation by determining the shape of an optimum heat pump which is appropriate for small scale houses. It is concluded as 3 meters long for the laying depth of underground piping of the horizontal type geothermal heat pump system in regard to the 5 RT capacity standard that is suitable for a small scale house. The shape of the horizontal type geothermal heat pump system for a small scale house is theThree pipe shape whose trench length is short and pipe length laid in a trench is short. It is 9 for the number of laying pipes that is most appropriate to system.

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Simulation of a two-stage absorption heat pump cycle using treated sewage (하수처리수 이용 흡수식 열펌프 사이클의 시뮬레이션)

  • 이용화;신현준;최국광
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.3
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    • pp.422-430
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    • 1999
  • This paper concerns the study of a two-stage absorption heat pump cycle to utilize treated sewage. This two-stage cycle consists of coupling double-effect with parallel or series flow type and single effect cycle so that the first stage absorber and condenser produces hot water to evaporate refrigerant in the evaporator of the second stage. The effects of operating variables such as absorber temperature on the coefficient of performance have been studied for two-stage absorption heat pump cycle. The working fluid is lithium bromide and water solution. The efficiency of the two-stage absorption heat pump cycle has been studied and simulation results show that higher coefficient of performance could be obtained for the first stage with parallel flow type. The optimum ratio of solution distribution can be shown by considering the COP, the crystallization of solution and the generator temperature.

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Design and performance analysis of water-to-air heat pump system using double-tube heat exchanger (이중관 열교환기를 사용한 물 대 공기 열펌프 시스템의 설계와 성능해석)

  • Han, D.Y.;Park, K.J.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.4
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    • pp.462-471
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    • 1997
  • The water-to-air heat pump system requires relatively lower energy consumption and less installation space. The heat exchangers used for this system are the finned-tube type for the indoor unit and the double-tube type for the outdoor unit. Mathematical models for this system are developed and programmed in computer. Experimental data from various conditions are obtained and compared with calculated values from the computer simulation program. Differences of cooling capacity and COP are 1.25% and 0.47%, and those of heating capacity and COP are 0.51% and 0.13%, respectively. Simulation results are in good agreement with test results. Therefore, the developed program is effectively used for the design and the performance prediction of water-to-air heat pump system.

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A Study on Heating Characteristics of Ground Source Heat Pump with Variation of Heat Exchange Methods (열교환방식에 따른 지열히트펌프의 난방특성에 관한 연구)

  • Cha, Dong-An;Kwon, Oh-Kyung;Park, Cha-Sik
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.8 no.2
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    • pp.9-15
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    • 2012
  • The objective of this study is to investigate the influence on the heating performance for a water-to-water 10RT ground source heat pump by using the water switching and refrigerant switching method. The test of water-to-water ground source heat pump was measured by varying the compressor speed, load side inlet temperature, and ground heat source side temperature. The heating capacity and COP of the heat pump increased with increasing ground heat source temperature. As a result, compared to a refrigerant switching method, the water switching method with counter flow improves the heating capacity and COP by approximately 5% in average, respectively.

The Study on the Performance of the Fuel Cell Driven Compound Source Hybrid Heat Pump Heating and Cooling System to Large Community Building (대형 Community 건물의 연료전지 구동 복합열원 하이브리드 히트펌프 냉.난방 시스템 성능 해석)

  • Byun, Jae-Ki;Jeong, Dong-Hwa;Choi, Young-Don
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.82-87
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    • 2007
  • In the present study, the simulation on the annual performance evaluation of a renewable energy systems with fuel cell driven compound source hybrid heat pump systems is applied to the heating and cooling of large community building. The large community building has the economical advantage to apply heat pump cooling and heating systems the long period operation. If air and ground source hybrid heat pump systems are combined, COP of the system can be increased largely. Fuel cell driven compound source hybrid heat pump system can reduced the fuel cost as well as thermal storage tank sharply.

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Fuzzy Defrost Control of the Multi-Type Heat Pump System (퍼지룰을 이용한 멀티형 히트펌프 시스템의 제상 제어)

  • 한도영;김경훈
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.12 no.8
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    • pp.711-716
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    • 2000
  • A fuzzy defrost control algorithm for the multi-type heat pump system was developed. In the fuzzy defrost control algorithm, the air temperature difference at the outdoor unit and the refrigerant pressure difference at the compressor were used as input variables, and the defrost starting time and the defrost time interval were used as output variables. This fuzzy algorithm was applied to the multi-type heat pump system and tested in the five dynamic environmental chambers. Test results show that the newly developed control algorithm is more effective than the conventional control algorithm in the removal of frost formed at the outdoor unit of the heat pump.

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Development of comfort algorism for Indoor temperature chagne in Heating System (변동환경 대응을 위한 난방System의 쾌적 알고리즘 개발)

  • Kim, Dong-Gyu;Jeong, Yong-Hyun;Kum, Jong-Soo
    • Journal of Fisheries and Marine Sciences Education
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    • v.18 no.3
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    • pp.229-235
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    • 2006
  • This study investigated physiology and psychological response of subjects, when heat pump was operated long time within comfort temperature range. Eight subjects were participated for the experiment. Their age was from 22 to 25 years old. The results of this experiment will propose basic data for improving comfort control algorithm in fluctuating environment by using heat pump. When indoor temperature was controlled by heat pump, the conclusion was as follows. 1) When votes of subjects was considered, the thermal comfort neutrality or lower range helped formation of comfort sensation for subjects. 2) When room temperature was lower, thermal comforts of shoulder, knee and foot with subjects thermal comfort showed high correlation. And when room temperature was higher, thermal comfort of face region with subjects thermal comfort showed high correlation. 3) The necessity of temperature change after 50 minutes from initially operating heat pump demands the additional analysis against the physiological signal.