• Title/Summary/Keyword: Dehumidification efficiency

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The Analysis of the Effects of Design Parameters on the Energy Efficiency and Performance of TEM Dehumidifiers (열전모듈 제습기의 에너지 효율과 성능에 미치는 설계 인자의 영향 분석)

  • Lee, Tae-Hee
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.16 no.3
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    • pp.1-7
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    • 2020
  • To provide a design direction for high efficiency thermoelectric module(TEM) dehumidifiers, the effects of design factors of TEM dehumidifiers on dehumidification energy efficiency and performance were numerically investigated. The design factors considered in this study are the TEM capacity, the performance of heat exchangers on the heating and cooling surfaces of the TEM. The higher capacity of the TEM results the higher dehumidification energy efficiency and performance at some operating voltage. The enhanced performance of the heat exchanger on heating surface increased the dehumidification energy efficiency and performance at all the operating voltage. The enhanced performance of the heat exchanger on cooling surface decreased the dehumidification energy efficiency and performance at all operating voltage.

Preparation and characteristics of inorganic membrane for air dehumidification (공기 제습용 무기막의 제조 및 특성)

  • Kim, Jeong-Eun;Kim, Byoung-Moon;Song, Kun-Ho;Chang, Wha-lk;Lee, Kwang-Rae
    • Journal of Industrial Technology
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    • v.26 no.B
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    • pp.157-162
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    • 2006
  • Recently, the humidity adjustment of indoor air is of great importance in air conditioning system as a applied, in buildings, vehicles, and containers for storage and transport of perishable products. Membrane dehumidification or air is potentially attractive because it offers low capital and operating costs, along with low energy consumption. And membrane dehumidification process attracted the attention of the public instead of the other dehumidification processes, such as adsorption, absorption, and refrigeration cycles and so on. In this study, the prepared hydrophilic inorganic membrane-based dehumidifiers(membrane air dehumidification) examined the performance of dehumidification. The surface-modified inorganic membrane prepared in this study showed high dehumidification efficiency(over 80%). The membrane might be very useful for dehumidification industries.

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Energy Saving Components Analysis in Hybrid Desiccant Dehumidification System (하이브리드 데시칸트 제습방식 에너지 절감 요소분석)

  • Park, Jongil;Park, Seungtae
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.27 no.11
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    • pp.603-608
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    • 2015
  • The hybrid desiccant dehumidifier is an energy-effective system in comparison with the existing desiccant dehumidifier. Its main feature is to use the heat given off by the condenser as the react heat source. Through analysis of the elements for a more efficient design of the hybrid desiccant dehumidifier, it is evident that those energy-saving components do not work individually, but organically influence the efficiency of the equipment. Therefore, the hybrid desiccant dehumidifier may be an important product in the dehumidification industry.

A Study on the automation of external collector type solar-dehumidification drying of wood using a personal computer (개인용(個人用)컴퓨터를 이용(利用)한 외부집열판형(外部集熱板型) 제습태양열(除濕太陽熱) 목재건조(木材乾燥)의 자동화(自動化)에 관한 연구(硏究))

  • Lee, Hyoung-Woo
    • Journal of the Korean Wood Science and Technology
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    • v.20 no.2
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    • pp.23-30
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    • 1992
  • An experimental external external collector type, solar dehumidification dryer was retrofitted with a simple computer-based control system. Solar, solar-dehumidification, and air-drying of 3cm-thick douglas-fir were carried out to investigate the drying-conditions and characteristics of this system, and to analyze the energy efficiencies of each drying met hods in summer. The drying rate of solar-dehumidification was 12%/day, which was about 2 times and 3 times faster than that of solar-and air-drying, respectively. The amount of diurnal temperature fluctuation inside the solar-dryer was greatly reduced and the energy efficiency was enhanced from 25% to 60% by the dehumidifier.

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A Study on the Rotary Absorptive Dehumidifer (회전형 흡수식 제습기에 관한 연구)

  • Kim, Young-Il;Kim, Hyo-Kyung
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.15 no.2
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    • pp.169-181
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    • 1986
  • A numerical analysis has been conducted on the dehumidification phenomena of rotary absorptive dehumidifier. Parameters that affect the dehumidification efficiency, such as regeneration temperature, humidity, rotor angular velocity, air flow rate and regeneration section angle are studied and optimum driving conditions are determined from the results, Furthermore three new types of dehumidification method are developed to improve the efficiency They are named MODE 2, 3 and 4, while the present one MODE 1. Cooling zone has been constructed between regeneration and process Bone in MODE 2 and as a result exit temperature of the process air decreases. MODE 3 an improvement of MODE 2, recirculates the cooling air into the regeneration zone and regeneration input as well as exit temperature decreases. In MODE 4, some of tee regeneration air is recirculated and it cuts down the regeneration input. Among them MODE 3, showed the best dehumidification efficiency.

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A Study on an experimental basis a use deodorize stink of food-waste in order to cooling dehumidification (냉각 제습에 의한 음식물 쓰레기 처리장치 악취제거에 관한 실험적 연구)

  • Park, I.S.;Kim, J.D.
    • Journal of Power System Engineering
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    • v.12 no.1
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    • pp.35-40
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    • 2008
  • This paper presents an effective cooling dehumidification method to remove odorous gas from food-wastes. The odorous gases, such as Styrene, Ammonia, Hydrogen sulfide and Acetaldehyde, are produced in environments where temperature is $50\sim80^{\circ}C$ and humidity is $40\sim70%$. Under such conditions, experiments are performed reiteratively using experiment equipments. The effect of the cooling dehumidification is measured via measuring instrument, and this research is focused on improving efficiency. The effect of cooling dehumidification using measuring instrument is validated. At $80^{\circ}C$, four type of gases that was mentioned previously showed generally better cooling efficiency with a good result for a component concentration. Among them, hydrogen sulfide gas demonstrated the highest reduction of 50%.

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Improvement of Cooling Efficiency in Greenhouse Fog System Using the Dehumidifier (제습기를 이용한 온실 포그냉방시스템의 효율향상)

  • Nam Sang Woon;Kim Kee Sung;Giacomelli Gene A.
    • Journal of Bio-Environment Control
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    • v.14 no.1
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    • pp.29-37
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    • 2005
  • In order to provide fundamental data on utilization of dehumidifier in greenhouses, a condensing type dehumidifier using ground water as a coolant was developed and tested dehumidification performance. The developed dehumidifier was applied to greenhouse with fog cooling system and effect of dehumidification on improvement of evaporative cooling efficiency was analyzed. Results of the dehumidifier performance test showed that dehumidification using ground water as a coolant was sufficiently possible in fog cooling greenhouse. When the set point temperature of greenhouse cooling was $32^{\circ}C$ and as temperatures of ground water rose from $15^{\circ}C\;to\;18^{\circ}C,\;21^{\circ}C\;and\;24^{\circ}C$, dehumidification rates decreased by $17.7\%,\;35.4\%\;and\;52.8\%$, respectively. As flow rates of ground water reduced to $75\%\;and\;50\%$, dehumidification rates decreased by $12.1\%\;and\;30.5\%$, respectively. Cooling efficiency of greenhouse equipped with fog system was distinctly improved by artificial dehumidification. When the ventilation rate was 0.7 air exchanges per minute, dehumidification rates of the fog cooling greenhouse caused by natural ventilation were 53.9%-74.4% and they rose up to 75.4%-95.9% by operating the dehumidifier. In case of using the ground water of $18^{\circ}C$ and flow rate of design condition, it was analyzed that whole fog spraying water can be dehumidified even if the ventilation rate is 0.36 exchanges per minute. As a utilization of dehumidifier, it is possible to improve cooling efficiency of fog system in naturally ventilated greenhouses.

The Comparative Analysis of Drying-Conditions, -Rates, -Defects and Yield, and Heat-Efficiency in Solar-Dehumidification-Drying of Oaks With Those in Conventional Air-, Semi-Greenhouse Type solar-, and Kiln- Drying (참나무류(類)의 제습태양열건조(除濕太陽熱乾燥)의 조건(條件), 속도(速度), 결함(缺陷), 수율(收率) 및 열효율(熱效率)과 관행(慣行) 천연(天然), 반온실형(半溫室型) 태양열(太陽熱) 및 열기건조(熱氣乾燥)와의 비교(比較)·분석(分析))

  • Lee, Hyoung-Woo;Jung, Hee-Suk
    • Journal of the Korean Wood Science and Technology
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    • v.17 no.1
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    • pp.22-54
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    • 1989
  • Seasonal semi-greenhouse type solar-drying of 2.5cm-and 5.0cm-thick lumber of Quercus aliena Blume and Quercus variailis Blume was carried out to investigate the possibility of solar-drying of wood and to decide the active solar-drying period in Korea. In the active solar-drying period obtained solar-dehumidification, semi-greenhouse type solar-, air- and kiln-drying of 2.5cm -thick lumber of oaks were carried out to analyze drying-rates. -defects, and -yield in each drying-method and to calculate daily total absorbed solar-radiation the solar dryers. The energy balance equations were set up, considering all the energy requirements, to analyze the heat efficiencies of semi-greenhouse type solar and solar-dehumidification-dryer. In a seasonal drying the drying rate of semi-greenhouse type solar-dryer was highest in summer, and greater in fall, spring, and winter in order. Solar-drying time was 45% in summer to 50% in winter of the air-drying rime, and more serious drying-defects occurred in air-drying than in solar-drying. In the active solar-drying period. April, May, and June, the average drying rate in solar-dehumidification-drying was 1.0%/day and greater than 0.8%/day in semi-greenhouse type solar-drying. In solar-dehumidification-drying the time required to dry lumber to 10% moisture content was less than 60 days, and solar-dehumidification-drying showed the highest drying-yield, 65.01%, than the other drying methods. The daily total absorbed solar radiations were 8.51MJ on the roof collector and 6.22 MJ on the south wall collector. In the energy blance 69.48% of total energy input was lost by heat conduction through walls, roof. and floor 11.68% by heat leakage, 0.33% by heating the internal structures of the solar-dryer and 5.38% by air-venting. Therefore the heat efficiency of semi-greenhouse type solar-dryer 13.13%, was lower than that of solar-dehumidification-dryer, 14.04%. Solar-drying of lumber in Korea showed the possibility to reduce the air-drying-time in every season and the efficiency of solar-dehumidification drying was higher than that of semi-greenhouse type solar-drying.

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Analysis of Solar Radiation and Heat-Efficiency in Semi-Greenhouse Type Solar-Dehumidification Lumber Dryer (반온실형(半溫室型) 제습(除濕).태양열(太陽熱) 목재(木材)드라이어의 일사량(日射量)과 열효율분석(熱效率分析)에 관(關)한 연구(硏究))

  • Lee, Hyoung-Woo
    • Solar Energy
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    • v.9 no.3
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    • pp.3-12
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    • 1989
  • Semi-greenhouse type solar-dehumidification drying of oak was carried out to investigate the possibility to dry wood using solar energy in Korea. The energy balance equation was set up, considering all the energy requirements, and the solar radiation was calculated to analyze the efficiencies of solar dryer with and without the dehumidifier. The average temperature inside dryer and collector rose up to $52^{\circ}C$ and $70^{\circ}C$, respectively. The average daily total beam, diffuse, and ground-reflected radiations were 7.27MJ, 8.70MJ, and 0.33MJ on the roof and 2.08MJ, 4.84MJ, and 5.37MJ on the south wall collector, respectively. Heat efficiency of solar dryer was 14.04% with dehumidifier and 13.13% without dehumidifier. The energy required to remove 1g of water from wood was 0.0289MJ/g in solar-dehumidification drying and 0.0310 MJ/g in semi-greenhouse type solar drying.

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