• Title/Summary/Keyword: Absorption Heat Pump

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An Analysis of Energy Savings on the Solar-Absorption Heat Pump Systems for the Residential Use with the consideration of Annual Performance (연간 성능을 고려한 가정용 태양열-흡수식 히트펌프의 에너지 절약효과 분석)

  • Lee, J.H.;Lee, K.S.;Won, S.H.;Lee, M.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.3 no.4
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    • pp.263-275
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    • 1991
  • Studies on the annual performance of three different type of solar-absorption heat pump system (parallel type, series type, and generator type) are carried out by using the computer simulation. These include the calculation of solar energy from the solar collector, and the revision of computer package, developed by Oak Ridge National Laboratory, to predict the annual performance. Finally using weather data and load conditions, the annual performance are obtained. Results show that the annual operating costs of three solar-absorption heat pump systems are almost same values and 44% lower than that of the pure absorption heat pump system. The total annual input energys of solar-absorption heat pump systems are also about 44% lower than that of the pure absorption heat pump. The nominal size of the solar-absorption heat pump systems can be reduced to a value of 55% that of the pure absorption heat pump that would normally be specified under identical conditions.

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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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Rectification Characteristic of Packing Materials in the Packed-type Rectifier of $NH_3/H_2O$ Absorption Heat Pump (암모니아 흡수식 열펌프 충전식 정류기의 정류 특성에 관한 연구)

  • 김돈수;윤상국
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.10
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    • pp.775-780
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    • 2002
  • An experimental study on the characteristics of several kinds of packing materials was carried out in order to get the optimum design data for the packed-type rectification system of an NH$_3$/$H_2O$ GAX absorption heat pump. Several suitable packing materials were examined and the bulk of steel wire was shown as the most effective packing material in rectifier. The optimum volumetric ratio of packed steel wire in rectifier was obtained as around 36%. The performance results can be adapted in rectifier design of absorption heat pump.

Computer Simulation on the Performance of Air-Cooled Condenser for an Absorption Heat Pump (흡수식 열펌프용 공냉식 응축기의 성능특성에 관한 시뮬레이션)

  • 박윤철;민만기
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.8
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    • pp.1999-2011
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    • 1995
  • Computer simulation was conducted to study performance characteristics of air-cooled condenser of a double effect absorption heat pump with variations of saturation pressures and mass flow rates of the refrigerant ; volume flow rates, relative humidities and temperatures of the air The vertically installed condenser had the staggered tube array with continuous plate fins of wavy type. When the saturation pressure of the condenser was decreased from 760 torr to 20 torr, heat transfer rates and condensing rates of refrigerant were decreased. If excess refrigerant flows in the condenser, the pressure and saturation temperature of the condenser were increased which makes the refrigerating capacity of an absorption heat pump reduced.

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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A Study on Improvement of Performance of Absorber in Absorption Heat Pump (흡수열펌프에서 흡수기의 성능 개선 연구)

  • Min, Byong-Hun
    • Applied Chemistry for Engineering
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    • v.19 no.3
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    • pp.338-344
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    • 2008
  • The improvement of energy conservation is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy-saving in this respect. Absorption heat pump is a means to upgrade waste heat without the addition of extra thermal energy. The higher performance of absorber is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorber of tangential feed of a liquid phase with spiral tube has been investigated using methanol-glycerine as a working fluid. The spiral tube and tangential feeding generate the turbulence into the liquid flow while increasing the mass and heat transfer coefficients. The simultaneous heat and mass transfer were found to take place in a liquid turbulent film in the absorber with the spiral tube during the process of gas absorption. By calculating mass and heat transfer coefficients by measurement of the concentration and the temperature of each position in the absorber, the entrance was found to be more effective in enhancing mass and heat transfer.

Cycle Analysis of Air-Cooled Double-Effect Absorption Cooling System with Parallel Flow Type (공랭형 병렬방식 2중효용 흡수식 냉방시스템의 사이클 해석)

  • 오명도;김선창;김영인;이홍원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.8
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    • pp.2099-2109
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    • 1993
  • A gas-fired 4RT absorption heat pump was designed as an air-conditioner for domestic use during the summer. The absorption heat pump is air-cooled. double-effect, $LiBr-H_{2}O$ system with parallel flow type. The performance of the absorption heat pump in the cooling mode of operation was investigated through cycle modeling and simulation to obtain the system characteristics with parameter changes. System parameters considered in this analysis were the inlet temperature of cooling air to the absorber, the working solution concentrations, the ratio of the amount of the weak solution from the absorber, and the LTD's of each heat exchange component. The optimum designs and operating conditions were determined based on the operating constraints and the coefficient of performance.

Simulation of the First Kind LiBr-H2O Absorption Heat Pump (제1종 LiBr-H2O 흡수식 열펌프의 시뮬레이션)

  • Huh, J.Y.;Choi, Y.D.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.2 no.1
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    • pp.11-26
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    • 1990
  • The first kind LiBr -$H_2O$ absorption heat pump system was simulated and the performances of it were predicted. The elements of heat pump system, evaporator, absorber and generator were analysed by solving the energy balance equations and concentration equations which describe the reactions between working fluids. The results show that the temperature gain of absorber and condenser and the COP of the system are affected considerably by the operating conditions of heat pump system.

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A Study on Absorber in Absorption Heat Pump with Methanol-Glycerine System as a Working Fluid (메탄올-글리세린계를 작동유체로 하는 흡수열펌프에서 흡수기 연구)

  • Min, Byong-Hun
    • Applied Chemistry for Engineering
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    • v.17 no.1
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    • pp.111-117
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    • 2006
  • The improvement of energy conservation mandates decrease consumption of fossil fuels and minimize negative impacts on the environment, which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Adsorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. The increase of absorbed amount is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorbers of two different types have been investigated using methanol-glycerine as a working fluid. The former was tangential feed of liquid phase without spiral tube in the absorber and the latter was with spiral tube in the absorber. The latter was found to be more effective in enhancing the mass and heat transfer to increase the absorption performance.

Effects of Operation Conditions on the Performance of Type II LiBr-H2O Absorption Heat Pump (제 2종 LiBr-H2O 흡수식 히트펌프의 운전 변수에 따른 성능 특성 수치 해석)

  • Yoon, Jun Seong;Kwon, Oh Kyung;Cha, Dong An;Bae, Kyung Jin;Kim, In Gwan;Kim, Min Soo;Park, Chan Woo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.1
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    • pp.7-14
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    • 2017
  • This study carried out a numerical analysis of the effects of hot waste water supply on the performance of a Type II absorption heat pump. There are two types of hot waste water supply, regular series flow and reverse series flow. Also it investigated the interaction between each type of flow and heat exchange solutions. As the effectiveness of heat exchange solutions increase, the steam generation and (COP) increase as well. If the effectiveness of a heat exchange solution is lower than 0.566, the steam generation rate of the reverse flow is lower than that of the regular series flow. A high effectiveness of heat exchange solution is therefore required to make a larger amount of steam in reverse series flow than with ordinary series flow. The COP difference between the two types of flow decreases with the increasing effectiveness of the heat exchange solution. Thus, a reverse flow type absorption heat pump can match the high steam generation rate and COP of the ordinary flow type when a highly effective heat exchange solution is applied.