• Title/Summary/Keyword: Direct cooling system

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Effects of performance analysis of a desiccant cooling system with a direct evaporative cooler in the regeneration process (재생 입구 직접증발냉각기 적용이 제습냉방시스템 성능에 미치는 영향)

  • Dash, Ulziiutas;Oh, Myung-Do
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.633-638
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    • 2009
  • In this study the performance analysis and cooling capacity of desiccant cooling system incorporating regenerative cooler and direct evaporative cooler in the regeneration air inlet were investigated on the condition of low regeneration temperature and time rotation 180s and area ratio of regeneration to dehumidification section 0.7. The cooling capacity and COP are evaluated at various effectiveness values of the direct evaporative cooler or the regenerative evaporative cooler. As either of effectiveness of the regenerative and direct evaporative coolers of desiccant cooling system increases, both the cooling capacity and COP increase, but effectiveness value of regenerative cooler gives the opposite effect on the system performance. It is found that effectiveness of regenerative cooler less than 0.7 shows the optimum cooling capacity.

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A Study on Direct Cooling and Indirect Cooling in Etching Process Cooling System (식각 공정용 냉각시스템에서의 직접 냉각 방식과 간접 냉각 방식에 관한 연구)

  • Jang, Kyungmin;Kim, Kwangsun
    • Journal of the Semiconductor & Display Technology
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    • v.17 no.3
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    • pp.100-103
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    • 2018
  • Due to the plasma applied from the outside, which acts as an etchant during the etching process, considerable heat is transferred to the wafer and a separate cooling process is performed to effectively remove the heat after the process. In this case, a direct cooling method using a refrigerant is suitable for cooling through effective heat exchange. The direct cooling method using the refrigerant using the latent heat exchange is superior to the cooling method using the sensible heat exchange. Therefore, in this paper, AMESim is used to design a direct refrigerant cooling system using latent heat exchange simulator was built.The constructed simulator is reliable compared with the actual experimental results. It is expected that this simulator will help to design and search for optimal process conditions.

A Study on the Development of AMESim Model for Construction of Cooling System for Semiconductor Etching Process (반도체 식각 공정용 냉각 시스템 구축을 위한 AMESim 모델 개발)

  • Kim, Daehyeon;Kim, Kwang-Sun
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.3
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    • pp.106-110
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    • 2017
  • Due to the plasma applied from the outside, which acts as an etchant during the etching process, considerable heat is transferred to the wafer and a separate cooling process is performed to effectively remove the heat after the process. In this case, a direct cooling method using a refrigerant is suitable for cooling through effective heat exchange. The direct cooling method using the refrigerant using the latent heat exchange is superior to the cooling method using the sensible heat exchange. Therefore, in this paper, AMESim is used to design a direct refrigerant cooling system using latent heat exchange simulator was built.The constructed simulator is reliable compared with the actual experimental results. It is expected that this simulator will help to design and search for optimal process conditions.

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Effects of Performance Analysis of a Desiccant Cooling System with a Direct Evaporative Cooler in the Inlet of Regeneration Process (재생입구 직접증발냉각기 적용이 제습냉방시스템 성능에 미치는 영향)

  • Dash, Ulziiutas;Sung, Sang-Chul;Oh, Myung-Do;Lee, Dae-Young
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.5
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    • pp.328-335
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    • 2010
  • The purpose of this study is to make an analysis of influence on the cooling capacity and COP of a desiccant cooling system with a regenerative evaporative cooler when a direct evaporative cooler was applied to the inlet of regeneration process of this system. We used cycle simulation in order to analyze the performance of this system. From the cycle simulation, we knew that the optimal rotation time of desiccant rotor was between 160s and 220s and hardly ever affected cooling capacity of desiccant cooling system when this system was operated at the outdoor air condition of $35^{\circ}$ and 40% RH and low regeneration temperature of $60^{\circ}$. Also there was optimal area ratio of regeneration to dehumidification between 0.7 and 1.0. Our results showed that it had a small effect on the system’s cooling capacity to install direct evaporative cooler at the inlet of regeneration process.

Performance Analysis of Water Direct Contact Air Conditioning System (물 직접접촉식 공기조화장치의 성능해석)

  • Yoo, S.Y.;Kwon, H.K.;Song, J.;Kim, K.Y.;Park, J.T.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.158-163
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    • 2001
  • Performance of the water direct contact air conditioning system, in which heat and mass are transferred directly between air and water droplet, is simulated by semi-empirical method. This system improves transport efficiency compared to conventional indirect contact system and cooling, heating, dehumidification and humidification are attained with one unit. In this study, temperature and flowrate for air and water are measured in the various cooling and heating conditions, and correlations for $h_{c}A/c_{pm}$ are derived from these data. Cooling and heating characteristics of the water direct contact air conditioning system are investigated using correlations.

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Cycle Simulation of a Desiccant Cooling System with a Regenerative Evaporative Cooler (재생형 증발식 냉각기를 이용한 제습 냉방시스템의 성능해석)

  • 이재완;이대영;강병하
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.6
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    • pp.566-573
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    • 2004
  • Comparison of the cooling performance is provided between the desiccant cool-ing systems incorporating a direct evaporative cooler and a regenerative evaporative cooler, respectively. Cycle simulation is conducted, and the cooling capacity and COP are evaluated at various temperature and humidity conditions. The COP of the system with a regenerative evaporative cooler and the regeneration temperature of 6$0^{\circ}C$ is evaluated 0.65 at the outdoor air condition of 35$^{\circ}C$ and 40% RH. This value is found about 3.4 times larger than that of the system with a direct evaporative cooler. Furthermore, incorporating a regenerative evaporative cooler eliminates the need for deep dehumidification in a desiccant dehumidifier 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.

Effects of Phase Change Material Floor Heating Systems using Direct Solar Gain on Cooling Load (직달일사를 이용한 잠열축열식 바닥난방 시스템이 냉방부하에 미치는 영향에 대한 검토)

  • Kim, Soo-Kyung
    • Journal of the Korean Solar Energy Society
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    • v.33 no.3
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    • pp.9-16
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    • 2013
  • In this research, the effect of a heating system, which is powered by direct solar energy accumulated in phase change material (PCM) as heat storage material installed on the floor surface, on the cooling load was studied. Cooling load of a test building designed for this research was measured with fan coil unit and factors affecting it were also estimated. Experiments were performed with and without PCM installed on the building floor to understand the effect of the PCM on the cooling load. Additionally, to confirm the experiments results, the prediction calculation formula by average outside temperature and integrated solar radiation was composed using multivariate regression model. The results suggested that the heating system with PCM on the floor surface has the potential to shift electric power peak by radiating heat, stored during the daytime in it, at night, not increasing the total cooling load much.

Development of the Wearable Personal Cooling System (착용형 개인 냉방시스템 개발)

  • Jang, Jun-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.7
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    • pp.2872-2877
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    • 2012
  • This paper discusses the development of the wearable personal cooling system for reducing thermal stress in hot environment. The personal cooling system is operated with the compact refrigeration system by compressing refrigerant. The compact refrigeration system is applied with the miniaturization and weight reduction for portable and wearable cooling system. The body heat is reduced by heat conduction with evaporator in direct cooling type. The cooling capacity of the wearable personal cooling system is approximately 100W and, the system could maintain the inside temperature of approximately 12-$13^{\circ}C$ lower than the ambient temperature. The weight of the wearable cooling system is about 3kg including vest, case, battery and all parts.

Performance Analysis of Water/Air Direct Contact Air Conditioning System (물-공기 직접접촉식 공기조화장치의 성능해석)

  • 유성연;권화길;김광영
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.2
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    • pp.175-183
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    • 2004
  • Performance of the water/air direct contact air conditioning system, in which heat and mass are directly transferred between air and water droplet, is simulated using semi-empirical method. Direct contact system improves transport efficiency compared to conventional indirect contact system. In this study, correlations for h$_{c}$A / c$_{pm}$ which represent the capacity of direct contact system are derived as a function of air and water flowrate from the experimental data. Cooling and heating performance of the water/air direct contact air conditioning system are evaluated using these correlations.ons.

Flow Characteristics of Oil Jet for Cooling a Piston (피스톤 냉각용 엔진오일 제트 유동특성)

  • Li, L.;Lee, J.H.;Jung, H.Y.;Kim, J.H.;Lee, Y.W.
    • Journal of Power System Engineering
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    • v.10 no.4
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    • pp.50-55
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    • 2006
  • An efficient cooling system for a piston of an automotive engine is very important. Therefore a large capacity gasoline engine or diesel engine has adopted the direct injection cooling system to increase its cooling efficiency. In this direct cooling system, an cooling oil is injected to a piston directly using an oil jet and this cooling oil flows through an oil gallery inside the piston. Flow rate and injection accuracy of this cooling oil are very important because these are main factors that have influence on its efficiency. The purpose of this study is to understand the changes of flow characteristics with various curvatures and diameters of an outlet nozzle and to check whether engine oil enters into the oil gallery well or not. From this study, we found that secondary flow was formed in a curved part of jet due to centrifugal force and irregular flow pattern appeared at the jet outlet. This pattern has influence on flow characteristics of engine oil entering the gallery. These simulation results have a good agreement with experiments.

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