• Title/Summary/Keyword: Desiccant Dehumidifier

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Experimental Study on Mass Transfer Rate at the Packed Column of Solar Cooling Liquid Desiccant System Using Counter Flow Configuration

  • Hengki R, R.;Choi, K.H.;Yohana, Eflita;Sukmaji, I.C.;Kim, J.R.
    • 한국태양에너지학회:학술대회논문집
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    • 2009.04a
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    • pp.155-161
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    • 2009
  • Desiccant systems have been proposed as energy saving alternatives to vapor compression air conditioning for handling the latent load. Use of liquid desiccants offers several design and performance advantages over solid desiccants, especially when solar energy is used for regeneration. The liquid desiccants contact the gas inside the packed column and the heat transfer and mass transfer will occur. This proposal is try study the mass transfer and heat transfer inside the packed column of dehumidifier and regenerator systems. And later on, the rates of dehumidification and regeneration that were affected by desiccant flow rates, air temperature and humidity, and desiccant temperature and all that variation will influence the performance of the systems.

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Performance Characteristics of the Desiccant Cooling System in Various Outdoor and Load Conditions (외기조건에 따른 제습냉방시스템의 성능 특성)

  • Lee, Dae-Young;Chang, Young-Soo
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.623-628
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    • 2009
  • Desiccant based air conditioning system offers a promising alternative to conventional one using vapour compression refrigeration for energy saving and greenhouse gas reduction. It is a heat driven cycle which has high potential for the use of low grade heat source such as the waste heat from the cogeneration plant or the solar thermal energy. In this study, the cooling performance of a desiccant cooling system incorporating a regenerative evaporative cooler was characterized in various operation conditions through numerical simulation. The cooling capacity and COP were evaluated at various outdoor conditions, regeneration temperatures, and supply flow rates. Based on the performance characteristics, the optimal control scheme was discussed to minimize the cooling cost at part load condition.

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Desiccant Air Conditioning System market and Prospect (데시칸트 공조시장 및 전망)

  • Park, Seung-Tae;Chung, Kwang-Seop;Kim, Young-Il;Park, Jong-Il
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.230-235
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    • 2009
  • The Desiccant air conditioning system has been designed as the industrial dehumidifier under the leadership of developed countries, considering CFC problems in 1990, indoor air quality(IAQ) and outdoor air intake rates. This could make the technical differences between them and us. Nowadays, domestic technology has been developed in some parts but there still remain many challenges to be managed. In this study, these tasks would be handled according to the desiccant air conditioning system market and prospects.

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Small-Capacity Solar Cooling System by Desiccant Cooling Technology (태양열 이용 소용량 제습냉방시스템)

  • Lee, Dae-Young;Kwon, Chi-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.154-156
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    • 2008
  • A prototype of the desiccant cooling system with a regenerative evaporative cooler was built and tested for the performance evaluation. The regenerative evaporative cooler is to cool a stream of air using evaporative cooling effect without an inc6rease in the humidity ratio. It is comprised of multiple pairs of dry and wet channels and the evaporation water is supplied only to the wet channels. By redirecting a portion of the air flown out of the dry channel into the wet channel, the air can be cooled down to a temperature lower than its inlet wet-bulb temperature at the outlet end of the dry channels. Incorporating a regenerative evaporative cooler eliminates the need for deep dehumidification in the desiccant rotor that is necessary to achieve low air temperature in the system with a direct evaporative cooler. Subsequently, the regenerative evaporative cooler enables the use of low temperature heat source to regenerate the dehumidifier permitting the desiccant cooling system more beneficial compared with other thermal driven air conditioners. At the ARI condition with the regeneration temperature of $60^{\circ}C$, the prototype showed the cooling capacity of 4.4 kW and COP of 0.75.

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Study Characteristics in Packed Tower of Liquid Desiccant Solar Cooling System Using Counter Flow Configuration

  • Rahmanto, R. Hengki;Choi, K.H.;Agung, B.;Sukmaji, I.C.
    • 한국태양에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.168-174
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    • 2009
  • High water vapour content in air can cause a number of problems as for human or surrounding materials. For human a high water vapour can create physiological stress, discomfort, and also can encourage ill health. While, the cause for the environment is can accelerate the corrosion of metals, accelerate the growth of spores and mould, can reduce the electrical resistance of insulators and etc. Desiccant systems have been proposed as energy saving alternatives to vapor compression air conditioning for handling especially the latent load and also sensible load. Use of liquid desiccants offers several design and performance advantages over solid desiccants, especially when solar energy is used for regeneration. The liquid desiccants contact the gas inside the packed tower of liquid desiccant solar cooling system and the heat transfer and mass transfer will occur. This thesis is trying to study the characteristics inside the packed tower of dehumidifier systems. This characteristics consist of mass transfer rate, heat transfers rate, human comfort and energy that consume by the system. Those characteristics were affected by air flow rates, air temperature and humidity, and desiccant temperature and all that variation will influence the performance of the systems. The results of this thesis later on can be used to determine the best performance of the systems.

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A Study on the Improvery Efficiency of Heavy Water Vapour for CANDU Reactor Systems (CANDU형 원자력 발전소의 중수 증기 회수율 증대 방안에 관한 연구)

  • 김윤제;박이동;황영규;이도영
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1995.05a
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    • pp.101-112
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    • 1995
  • In order to improve the recovery efficiency of heavy water vapour from the atmosphere inside a reactor building, and to recover and upgrade the heavy water which escape, special treatments, such as reducing the ingress of light water vapour, are studied in the design of the CANDU reactor systems. This is considered in controlled method of the humidity over drawing fresh air through a desiccant dehumidifier which dries the air by absorption. Comparing with the moisture loads between summer and winter operations, the moisture removal rates are calculated. Those are proportional to the difference between the controlled space and the surrounding environment Installation of a new dehumidifier will be able to reduce the moisture loads from the cooling systems, improving overall system efficiency and saving operating costs.

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Experimental Study on Influence of Flow Rate Ratio in a Dehumidifier with a Solar Desiccant Apparatus (태양열제습장치 중 제습기에서의 유량비 영향에 관한 실험적 연구)

  • Choi, Kwang-Hwan;Rokhman, Fatkhur
    • Journal of the Korean Solar Energy Society
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    • v.31 no.2
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    • pp.8-15
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    • 2011
  • 제습기의 역할은 태양열제습냉방시스템 요소 중에서도 매우 중요하다. 본 논문은 이러한 특성에 맞추어 제작된 장치를 갖고서 제습능력에 영향을 미치는 유량비를 바꾸어 실험한 결과이다. 실험은 크기가 $40m^3$인 항온항습실을 대상으로 이루어졌으며, 향류형 제습기의 수직 높이는 0.4m로 고정되었다. 또한 충진층은 액체흡수제와의 접촉면을 넓게하기 위하여 플라스틱 충진재로 채워져 있으며, 흡수제의 온도는 빠른 변화를 보기 위하여 $15^{\circ}C$로, 농도는 40%로 고정하였다. 액체흡수제의 유량과 습도가 높은 공기의 유량을 각각 3단계로 바꾸어 실험한 결과, 풍량이 높을수록 제습기 효과는 낮아졌으나, 전체적인 제습량에서는 많아졌다. 한편, 제습기에서 액체흡수제 유량이 많을수록 제습되는 수분량이 많아졌으나, 시간의 변화에 따라 제습되는 속도는 현저하게 낮아졌다. 따라서, 향후 실험에서는 유량의 변화 폭을 더욱 확대해서 많은 실험 결과를 확보하고, 이를 모델링화 하여 높은 정확도를 예측할 필요가 있다.

Research on the Performance of a Solar Air Conditioning System using a Liquid Desiccant in Summer (액체흡수제 이용 태양열 공조시스템의 하계 능력에 관한 연구)

  • Choi, K.H.;Yoon, J.I.;Kim, B.C.
    • Journal of the Korean Solar Energy Society
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    • v.22 no.2
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    • pp.33-38
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    • 2002
  • In order to find out whether solar air conditioning system could be applied to building or not, the performance and evaluation on thermal environment of the system suggested was done during summer. A solar model house was constructed to find out the performance and thermal environment evaluation when it actually operated outside. As a result, regeneration rate increased rapidly when LiCl solution temperature was over $50^{\circ}C$ and the regeneration rate was $13\sim15kg$ during 9 hours operation. Furthermore the dehumidification rate was 12kg at maximum during 10 hours operating of a dehumidifier and indoor temperature and relative humidity was $28.4^{\circ}C$ and 39.1% in average respectively. On evaluation of thermal environment during summer, PMV value was slightly high, but thermal sensation vote was 71% within the comfort zone.

A Study on Heat and Mass Transfer with the Different Flows in a Solar Desiccant Cooling System (태양열제습냉방시스템에서의 유량에 따른 열전달 및 물질전달에 관한 연구)

  • Eflita, Yohana;Choi, Kwang-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.30 no.5
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    • pp.17-24
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    • 2010
  • 태양열 제습냉방은 액체흡수제를 이용한 냉각효과로 기존의 전기에너지를 가능케 하는 해결책중 하나이다. 따라서 태양열을 거의 활용하지 않는 여름에 가열온수를 열원으로 활용하여 쾌적조건을 구현하는 본 연구의 대상인 태양열냉방시스템은 제습기와 재생기로 크게 이루어져 있다. 본 논문은 제습기의 유량 변화에 따른 열전달 및 물질전달의 변화를 실험과 이론적 해석으로 규명하고 있는데, 흐름의 양상은 병렬형과 대향류형을 대상으로 하고 있다. 실험결과와 이론해석이 비교적 잘 일치하였으며, 대향류형이 병렬형보다도 물질전달 면에서 유리하게 나타났으며, 입 출구의 엔탈피 차이에서도 크서 열전달에서도 우수한 것으로 나타났다. 또한 그 차이를 본 논문에서는 나타내었으며, 일정한 높이나 길이 이상에서는 항상 일정함을 알 수 있었다. 따라서 본 논문의 결과들은 제습기의 유동흐름을 통한 태양열냉방시스템 중 제습기의 설계 및 성능 향상에 도움을 줄 것이다.