• 제목/요약/키워드: Absorption refrigeration systems

검색결과 43건 처리시간 0.021초

$LiBr-H_2O$계 흡수식냉동기의 부식에 미치는 온도의 영향 (The Effect of Temperature on Corrosion of Absorption Refrigeration Systems Using $LiBr-H_2O$ Working Fluids)

  • 임우조;정기철
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제26권1호
    • /
    • pp.125-131
    • /
    • 2002
  • This paper was studied on the effect of temperature on corrosion of absorption refrigeration systems using $LiBr-H_2O$ working fluids. In the fresh water and 62 % lithium bromide solution at $70^{\circ}C$, polarization test of SS 400, Cu(C1220T-OL) and Al-Ni bronze was carried out. And polarization behavior, polarization resistance characteristics, corrosion rate(mmpy) and corrosion sensitivity of materials forming absorption refrigeration systems was considered. The main results are as following: (1) As the experimental temperature increase, the change of corrosion rate of Al-Ni bronze become duller than SS 400 and Cu in 62% lithium bromide solution. (2) According as corrosion environment is changed from fresh water to 62% lithium bromide solution, potential change of Cu and Al-Ni bronze become less noble than SS 400. (3) The corrosion sensitivity of Al-Ni bronze was duller than that of Cu and SS 400 in 62% LiBr solution.

Research and Development of the Triple Effect Absorption Chiller-Heater Technology in Japan

  • Kashiwagi, Takao;Akisawa, Atsushi;Hamamoto, Yoshinori
    • 대한설비공학회지:설비저널
    • /
    • 제33권3호
    • /
    • pp.43-49
    • /
    • 2004
  • This article reviews R&D of triple effect cycle developed in Japan. Most of the refrigeration and heat pump technologies are dominated by vapor compressor system. The vapor compressor system, however, is highly concerned with the environmental regulations , as most of the vapor compressor technologies are using CFCs or HCFCs which are known as ozone depleting and global warming gases. As a consequence, refrigeration technologists are trying to invent or to develop an alternative to vapor compressor refrigeration devices. Thermally driven, absorption technology is one of the possible alternatives. At the moment, absorption cycle is most promising technology The paper summarizes briefly the current research and development in advanced technologies of triple effect absorption chiller-heater in Japan.(omitted)

  • PDF

Study on the Cavitation Damage of Cupronickel(70/30) Tube for Gas Absorption Refrigeration Machine

  • Lim, Uh-Joh;Jeong, Ki-Cheol;Yun, Byoung-Du
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제28권2호
    • /
    • pp.332-337
    • /
    • 2004
  • The use of gas absorption refrigeration machine has considerably increased because of the shortage of the electric power in the summer and the regulation of freon refrigerant. Gas absorption refrigeration machine consists of a condenser, a heat exchanger. supplying pipes, a radiator etc, This system is likely to be corroded by acid. dissolved oxygen and gases, Cavitation erosion-corrosion by flow velocity of cooling water may happen in absorption refrigeration machine. In these cases. erosion and corrosion occur simultaneously. Then, it makes a serious damage with synergy effect. Therefore, this paper was studied on the cavitation damage of cupronickel(70/30) tube for gas absorption refrigeration machine, In the $30^{\circ}C$ tap water, linear polarization test and anodic polarization test were carried out for copper(C1220T-OL) and cupronickel(70/30) tube. Also, cavitation erosion-corrosion behavior of cupronickel (70/30) tube was considered, The main results are as following: (1) In the linear test, the corrosion current density of cupronickel(70/30) is higher than that of copper. (2) The erosion-corrosion rate of cupronickel(70/30) displayed later tendency than that of copper by vibratory cavitation in cooling water. (3) In cooling water, the progress mechanism of erosion-corrosion rate of copper and cupronickel(70/30) follows a pattern of incubation, acceleration, attenuation and a steady state period.

LiBr-$H_2O$계 흡수식냉동기의 부식에 미치는 온도의 영향 (The Effect of Temperature on Corrosion of Absorption Refrigeration Systems Using LiBr-$H_2O$ Working Fluids)

  • 임우조;정기철;윤병두;강성수
    • 한국마린엔지니어링학회:학술대회논문집
    • /
    • 한국마린엔지니어링학회 2001년도 추계학술대회 논문집(Proceeding of the KOSME 2001 Autumn Annual Meeting)
    • /
    • pp.92-97
    • /
    • 2001
  • This paper was studied on the effect of temperature on corrosion of absorption refrigeration systems using LiBr-$H_2O$ working fluids. In the fresh water and 62 %lithium bromide solution at $70^{\circ}C$, polarization test of SS 400, Cu(Cl220T-OL) and Ni-Al bronze was carried out. And Polarization behavior, polarization resistance characteristics, corrosion rate(mmpy) and corrosion sensitivity of materials forming absorption refrigeration systems was considered. The main results are as following: As the experimental temperature increase, the change of corrosion rate of Ni-Al bronze become duller than SS 400 and Cu in 62 % lithium bromide solution. Open circuit potential of SS 400 is less noble than that of Cu and Ni-Al bronze in fresh water, but that becomes noble than Cu and Ni-Al bronze in 62 % lithium bromide solution. The corrosion sensitivity of Ni-Al bronze was controlled than that of Cu and SS 400 in 62% LiBr solution.

  • PDF

$LiBr-H_2O$계 흡수식냉동기의 부식에 미치는 LiBr 농도의 영향 (The Effect of LiBr Concentration on Corrosion of Absorption Refrigeration Systems Using $LiBr-H_2O$ Working Fluids)

  • 임우조;정기철
    • 한국가스학회지
    • /
    • 제5권4호
    • /
    • pp.33-39
    • /
    • 2001
  • 흡수식냉동기의 작동매체로 사용되고 있는 LiBr수용액 중에서 각 구성재료인 일반구조용 압연강재, 동 및 동합금재인 Ai-Ni bronze의 부식거동에 관한 연구를 하기 위하여, 여러 가지 농도의 LiBr 수용액 중에서 각 재료에 대한 분극실험을 실시하여 부식거동을 고찰한 결과 다음과 같은 결론을 얻었다. 1) 수용액의 LiBr 농도가 증가할수록 각 재료의 분극저항은 낮아지고, 개로전위는 비전 위화되면서 부식전류밀도는 높게 배류된다. 2) 일반구조용 압연강재의 개로전위는 동 및 Al-Ni bronze의 개로전위보다 비전위화되면서 부식전류밀도는 더 높게 배류된다. 3) 동 및 Al-Ni bronze에 대한 $62\%$ LiBr 수용액 중에서의 양극분극은 활성태로 지속되지만, 천연해수 중에서의 양극분극은 활성태가 지속되다가 부동태화전류가 나타난다.

  • PDF

소형 암모니아 흡수식 냉난방기의 난방성능 특성 (The Characteristics of Heating Performance on Small Sized Ammonia Absorption System)

  • 진병주;오승택;윤정인;황준현;진심원
    • 대한설비공학회:학술대회논문집
    • /
    • 대한설비공학회 2008년도 하계학술발표대회 논문집
    • /
    • pp.120-123
    • /
    • 2008
  • Refrigeration plants using absorption principles have been around for many years with initial development taking place over 100 years ago. Although the majority of absorption cycles are based on water-LiBr cycle, many applications exist where ammonia-water can be used, especially where lower temperatures are desirable. In both systems water is used as working fluid, but in quite different ways: as a solvent for the ammonia system, and as refrigerant for the lithium bromide system. This explains that the lithium bromide absorption system is strictly limited to evaporation temperatures above $0^{\circ}C$. The main industrial applications for refrigeration are in the temperature range below $0^{\circ}C$, the field for the binary system ammonia-water.

  • PDF

소형 암모니아 흡수식 냉난방기의 냉방성능 특성 (The Characteristics of Heating Performance on Small Sized Ammonia Absorption System)

  • 진병주;오승택;윤정인;황준현;진심원;경익수
    • 대한설비공학회:학술대회논문집
    • /
    • 대한설비공학회 2008년도 동계학술발표대회 논문집
    • /
    • pp.198-202
    • /
    • 2008
  • Refrigeration plants using absorption principles have been around for many years with initial development taking place over 100 years ago. Although the majority of absorption cycles are based on water-LiBr cycle, many applications exist where ammonia-water can be used, especially where lower temperatures are desirable. In both systems water is used as working fluid, but in quite different ways: as a solvent for the ammonia system, and as refrigerant for the lithium bromide system. This explains that the lithium bromide absorption system is strictly limited to evaporation temperatures above $0^{\circ}C$. The main industrial applications for refrigeration are in the temperature range below $0^{\circ}C$, the field for the binary system ammonia-water.

  • PDF

LiBr작동유체 중에서 가스흡수식 냉온수기의 국부부식 특성에 관한 연구 (A Study on the Characteristics of Local Corrosion for Gas Absorption Refrigeration and Hot Water Systems in LiBr-$H_2O$ Working Fluids)

  • Uh- Joh Lim;Ki-Cheol Jeong;Byoung-Du Yun
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제27권6호
    • /
    • pp.714-720
    • /
    • 2003
  • Due to the electric power shortage in summer season and regulation of freon refrigerant, the application of gas absorption refrigeration and hot water systems are considerably increasing trend. But, this system consists of condenser, heat exchanger, supply pipe and radiator etc. which are easily corroded by acidity and dissolved oxygen and gases. In result, this system occurs scale attachment and corrosion damage like pitting and crevice corrosion. In this study, electrochemical polarization test of heat exchanger tubing material (copper, aluminium brass, 30% cupronickel(30% Cu-Ni)) was carried out in 60% lithium bromide solution at $95^{\circ}C$. As a result of polarization test, corrosion behavior by impressed potential and local corrosion. such as galvanic corrosion, pitting corrosion behavior, of tubing materials was investigated. The main results obtained are as follows: (1) The effect of pitting and crevice corrosion control of 30% cupronickel in 60% LiBr solution at $95^{\circ}C$ is very excellent. (2) Dissimilar metal corrosion of 30% cupronickel coupling to aluminium bronze is the most sensitive. (3) Current density behavior of tube materials by impressed potential is high in order of copper > aluminium brass > 30% cupronickel.

태양열에 의한 냉방 및 난방시스템의 성능향상(II) - 태양열을 이용한 흡수식 냉동기의 성능 - (The Improvement of the Performance of Solar Cooling and Heating Systems (II) - The Characteristics of an Absorption Refrigeration Powered by Solar Systems -)

  • 박문수;김무근;김효경;노승탁
    • 설비공학논문집
    • /
    • 제1권1호
    • /
    • pp.46-54
    • /
    • 1989
  • The purpose of this study is to obtain the dynamic characteristics of an absorption refrigerator powered by solar energy by experiments. Since the absorption refrigerator power by solar energy should have the characteristics which is suitable for the intermittence and rarity of solar energy, not only the characteristics of the steady state operations but also the partial load and the transient operations should be considered. The minimum available temperature of the storage tank should be known, and the absorption refrigerator can be suitably selected for air-conditioning systems. In this study, the experimental data of the transient state for on-off and warming-up operations has been obtained. Also the experiments are performed which test the minimum available temperature of the storage tank. The results show that it takes 1 hour to get to the steady state of the absorption refrigerator, and the minimum available temperature of the storage tank is about $68^{\circ}C$, and show that in the partial load operations the performance of the absorption refrigerator is improved by applying the modified control method to on-off operations.

  • PDF

알코올 흡수식 열펌프의 난방성능 예측 (Simulation of Alcohol Absorption Heat Pumps for Heating Performance)

  • 김동선
    • 설비공학논문집
    • /
    • 제27권5호
    • /
    • pp.269-276
    • /
    • 2015
  • Single-effect $CH_3OH-LiI-ZnBr_2$ and $C_2H_5OH-LiI$ absorption heat pumps are simulated to evaluate feasibility as heating device. These systems are predicted to give higher heating COPs in wide operating ranges compared to conventional systems. Among the two systems, the $C_2H_5OH-LiI$ system is found to be more advantageous for operating in extremely cold weather due to the large solubility of Lil in $C_2H_5OH$.