• Title/Summary/Keyword: 수냉식 열 펌프

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

  • Kim, Seong-Sil;Park, Wan-Kyu;Hur, Inn-Ju
    • Proceedings of the SAREK Conference
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    • 2008.06a
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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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Study on Performance Characteristic of Water-Cooled Type Beat Pump Using Hydrocarbon Refrigerants (탄화수소계 냉매를 이용한 수냉식 히트점프의 성능특성에 관한 연구)

  • Jun Chul-Ho;Lee Ho-Saeng;Kim Jae-Dol;Yoon Jung-ln
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.8
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    • pp.870-876
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    • 2005
  • This study of the performance characteristics of natural refrigerants such as R-290 (propane), R-6OOa (iso-butane) and R-1270 (propylene) has investigated to compare with conventional HCFC's refrigerant R-22 for water-cooled heat pump system. The experimental apparatus has basic parts of cycle that uses the water as a heat source. The Performance of the water-cooled system using hydrocarbon refrigerants had been getting better than R-22 from start-up to the similar evaporating temperature after stabilizing system. Through the above it is possible that hydrocarbon refrigerants could be drop-in alternatives for R-22.

Performance Characteristics of Water-Chilling Heat Pump Using CO2 on Variation of Refrigerant Charge Amount (냉매 충전량에 따른 CO2용 수냉식 열펌프의 성능 특성에 관한 연구)

  • Son, Chang-Hyo;Yu, Tae-Guen;Jang, Seong-Il;Oh, Hoo-Kyu
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.5
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    • pp.558-566
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    • 2007
  • The performance characteristics of water-chilling heat pump using $CO_2$ with respect to variation of refrigerant charge amount was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter-flow-type heat exchangers with concentric dual tubes, which are made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2400 mm length. The experimental results summarize as the followings : As the refrigerant charge ratio of $CO_2$ heat pump system increases, the discharge pressure and compressor ratio increases, but mass flow rate of refrigerant decreases. Also the compressor work increases with the increase of refrigerant charge ratio. However, the heating and cooling capacity of $CO_2$ heat pump decreases as the refrigerant charge ratio increases. The maximum heating COP of $CO_2$ heat pump system presented at 0.25 refrigerant charge ratio. It is possible to confirm the optimum charge ratio of $CO_2$ heat pump system by the viewpoint of heating COP.

Performance Characteristics of Water-Chilling Heat Pump Using CO2 on the Variation of Secondary Fluid Conditions (2차 유체 조건 변화에 대한 CO2용 수냉식 열펌프의 성능 특성에 관한 연구)

  • Son, Chang-Hyo;Oh, Hoo-Kyu
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.5
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    • pp.543-551
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    • 2007
  • The performance characteristics of water-chilling heat pump using $CO_2$ with respect to variation of inlet temperature and mass flow rate of secondary fluid was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter-flow-type heat exchangers with concentric dual tubes, which ate made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2.4 m length. The experimental results were summarized as the followings : As inlet temperature of secondary fluid in the gas cooler increases from $10^{\circ}C$ to $40^{\circ}C$, the compressor work, heating capacity and heating COP were varied to 37.8%, -13%, -35.9%, respectively. The heating capacity, compressor work, heating COP were turned into 23.3%, 6.42%, 13.1%, respectively when ass flow rate of secondary fluid in the evaporator increases from 70 g/s to 150 g/s. The above tendency is similar with performance variation with respect to temperature variation of secondary fluid in the conventional vapor compression cycle.

Study on Design Technology of Heat Pump Cycle for High Temperature Performance (고온 생산용 열펌프 사이클 설계)

  • Kim, Jong-Ryul;Kim, Seok-Young;Kim, Yong-Min;Lee, Kong-Hoon;Kim, Ook-Joong;Yi, Sung-Chul;Jung, Chi-Young;Kim, Jong-Ryeol
    • Journal of Energy Engineering
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    • v.19 no.4
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    • pp.228-233
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    • 2010
  • About 55% of total energy is consumed in the industrial division. The industrial heat pump application will show magnificent energy saving effect as well as higher cost efficiency because of larger energy consuming volume of each facility and longer operation hour and higher stability against seasonal temperature change. Over 90% of dryer for industrial usage has hot wind heat source and hot wind dryer is the representative type covering 68.7% while its 30 ~ 50% lower heat efficiency causes lots of energy loss by exhaust air. Re-usage of exhaust air can improve energy efficiency of dryer because 68% heat energy or 78% of hot air lose in exhaust air. Therefore, high temperature heat pump dryer can be the best alternative. Comparing to the existing dryer with 30% ~ 50% energy efficiency, newly developing high temperature heat pump dryer will enhance energy efficiency up to 60% ~ 80% efficiency. In this paper, heat pump system for high temperature was designed, constructed and tested. The results have shown that system COPh is estimated as 3.3.

Performance Characteristics of Water-Chilling Heat Pump Using CO2 on Control of Inverter Frequency (인버터 주파수 제어에 따른 CO2용 수냉식 열펌프의 성능 특성)

  • Son, Chang-Hyo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.12
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    • pp.4721-4726
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    • 2010
  • The performance characteristics of water-chilling heat pump using CO2 for the control of inverter frequency was investigated experimentally. An experimental apparatus is consisted of a compressor, a gas cooler, an expansion valve, an evaporator and a liquid receiver. All heat exchangers used in the test rig are counter flow type heat exchangers with concentric dual tubes, which are made of copper. The gas cooler and the evaporator consist of 6 and 4 straight sections respectively arranged in parallel, each has 2.4m length. The experimental results summarize as the following: for constant inlet temperature of evaporator and gas cooler, as mass flow rate, compression ratio and discharge pressure increases with the inverter frequency. And heating capacity and compressor work increases, but coefficient of performance(COP) decreases with the inverter frequency of compressor. As inlet temperature of secondary fluid in the evaporator increases from $15^{\circ}C$ to $25^{\circ}C$, compression ratio and compressor work decreases, but mass flow rate, heating capacity and COP increases with the inverter frequency of compressor. The above tendency is similar with performance variation with respect to the variation of inverter frequency in the conventional vapor compression refrigeration cycle.

Numerical Investigation of Cooling Performance of Liquid-cooled Battery in Electric Vehicles (하이브리드/전기 자동차용 수냉식 배터리 셀의 냉각성능에 관한 수치 해석적 연구)

  • Kwon, Hwabhin;Park, Heesung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.6
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    • pp.403-408
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    • 2016
  • Lithium-ion batteries are commonly employed in hybrid electric vehicles (HEVs), and achieving high energy density in the battery has been one of the most critical issues in the automotive industry. Because liquid cooling containing antifreeze is important in automotive batteries to enable cold starts, an effective geometric configuration for high-cooling performance should be carefully investigated. Battery cooling with antifreeze has also been considered to realize successful cold starts. In this article, we theoretically investigate a specific property of an antifreeze cooling battery system, and we perform numerical modeling to satisfy the required thermal specifications. Because a typical battery system in HEVs consists of multiple stacked battery cells, the cooling performance is determined mainly by the special properties of antifreeze in the coolant passage, which dissipates heat generated from the battery cells. We propose that the required cooling performance can be realized by performing numerical simulations of different geometric configurations for battery cooling. Furthermore, we perform a theoretical analysis as a design guideline to optimize the cooling performance with minimum power consumption by the cooling pump.

Thermal Analysis and Optimum Design of Water-Cooled, Series-Flow Type, Double-Effect Absorption Heat Pump (수냉형 직렬방식 2중효용 흡수식 냉방기의 열해석과 최적 설계)

  • Oh, M.D.;Kim, Y.L.;Kim, S.C.;Kim, Y.I.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.4 no.4
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    • pp.332-341
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    • 1992
  • An absorption heat pump cycle has been modeled and simulated to analyze the system performance of water-cooled, series-flow, double-effect absorption heat pump, which can be applied to a direct gas fired cooling system with the medium range of cooling capacity (15RT level). Effect of absorption cooling system parameters, such as concentration difference, inlet temperature of cooling water, 1st generator temperature, leaving temperature differences of condenser and evaporator and efficiency of solution heat exchanger, has been investigated in the view of system cooling performance.

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Development of 1.2kW LED Light with Water-Air Circulation (수공냉 대류방식을 이용한 1.2kW급 LED 조명등 개발)

  • Yoon, Byung-Woo;Song, Jong-Kwan;Park, Jang-Sik;Kwon, Hong-Bae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.5
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    • pp.615-622
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    • 2015
  • As the development of high efficiency and high flux density LEDs, the trend of illumination lamp industry transfers from conventional-lamps to the LED-lamps. For energy efficiencies, LED lamps are superior to the conventional lamps, but they have heat problems. Especially, the heat problems are severe for the high luminance lamps. They degrade the soldering point of the metal PCB, and shorten the life cycle of LEDs. So, the solution of the heat sinking is very important to develop high luminance LED lamps. This study suggested a new method to solve the heat problems for high luminance LED lamps, and developed a LED lamp which has 1200W power. In this study, a water jacket is installed to the LED lamp, and the cooing water is circulated by a water pump.