• Title/Summary/Keyword: Personal Cooling

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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.

A Development of the Dynamic Absorber and Damper for Vibration and Noise Reduction of the Personal Computer (PC의 진동/소음 저감을 위한 쿨링홴의 동흡진장치 및 절연장치의 개발)

  • Jung, Won-Young;Lee, Kyu-Ho;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.4
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    • pp.339-345
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    • 2011
  • The purpose of this study is reduction the vibration of the personal computer by developing the vibration absorber and damper. The eccentricity of the cooling fan causes the vibration of the computer. We designed the material properties of the vibration absorber and damper by FEM model within operation frequencies of the cooling fan. We experiment the overall analysis and system analysis by using a laser vibrometer. The result shows that the proposed dynamic absorber and damper reduce the vibration of the personal computer.

Application of Four-season Dedicated Outdoor Air Handling Unit in Central and Personal Air-conditioning (중앙공조 및 개별공조에서의 외조기 적용)

  • Park, Seung-Tae;Kim, Young-Il;Lee, Tae-Ho;Choi, Se-Young
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.591-596
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    • 2008
  • The present study has been conducted to study the performance of dedicated outdoor air handling unit in central and personal air-conditioning. With conventional central and personal air-conditioning systems which are designed according to the maximum load, humidity increase above comfort level can not be avoided as the cooling load decreases. The adoption of dedicated outdoor air handling unit, however, can solve this problem. Moreover, the dedicated outdoor air handling unit has the characteristics of anti-bacteria due to dry coil, energy saving and good indoor air quality. During cooling seasons, dedicated outdoor air handling unit can save energy up to 30% than the conventional cooling+reheating system for controlling both temperature and humidity.

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A Primary Study on the Enhancement of Efficiency in the Computer Cooling System using Entrance Tube of Outer Air (외부공기 유입관을 이용한 컴퓨터 냉각시스템의 효율향상에 관한 연구)

  • Kim, S.H.;Kim, M.H.
    • Journal of Power System Engineering
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    • v.13 no.4
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    • pp.56-61
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    • 2009
  • In recent years, since the continuing increase in the capacity in personal computer such as the optimal performance, high quality and high resolution image, the computer system's components produce large amounts of heat during operation. This study analyzes and investigates the ability and efficiency of a cooling system inside a computer by means of central processing unit (CPU) and power supply cooling fan. This research was conducted to enhancement of efficiency of the cooling system inside the computer by making a structure which produces different air pressures in an air inflow tube. Consequently, when temperatures of the CPU and room inside computer were compared with a general personal computer, temperatures of the tested CPU, the room and the heat sink were as low as $5^{\circ}C$, $2.5^{\circ}C$ and $7^{\circ}C$ respectively. In addition to, revolution per minute (RPM) was shown as low as 250 after 1 hour operation. This research explored the possibility of enhancing the effective cooling of high-performance computer systems.

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A Study on the Development of the PCR System Using Personal Computer (개인용 컴퓨터를 이용한 PCR System 개발에 관한 연구)

  • 최성길
    • Journal of Biomedical Engineering Research
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    • v.12 no.4
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    • pp.255-260
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    • 1991
  • A system using a personal computer has been developed for Polymerase Chain Reaction, an amplifying process of specific DNA. This system is composed of software and hardware which contains a control system, a heating and cooling system, a multichannel A/D converter, and a personal computor. The software is programmed'in assembly'and basic language. The newly developed PCR system which is controlled by the program of the personnal computor can be applied 1.o the amplification of various DNA. This system was tested by using Mycobacterium tuberculosis DNA and showed the DNA band on the UV transilluminator.

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A Study on the Flow Characteristics of Desktop Personal Computer by In-Out Fan (흡.배기 팬에 의한 Desktop Personal Computer 내부의 유동특성에 관한 연구)

  • Lee, Haeng-Nam;Park, Gil-Moon;Jung, Han-Byul
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.6
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    • pp.665-671
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    • 2007
  • The purpose of this study is to find out a flow characteristics required by the design of a computer case and to provide information about the preliminary data of cooling efficiency of CPU and a flow inside of a case. We examined a flow characteristic-suction a tracing particle occurred from a surge tand installed at an inlet into a computer case and moving it to a exit duct-experimentally by using PIV. The experimental device was consists of a fan inflowing and discharging the air into the computer case and a slot installed with a CPU cooling ran add-on, and analyzed the data of Re-stress distribution, velocity distribution, and kinetic energy distribution. This research will make a great contribution to improvement of the efficiency and performance of notebook, workstation, server, and all the design of electronic devices using large scale integrated(LSI) as well as usual computers.

Development of Micro-Cooling Fans for Cooling of CPU (CPU 냉각용 저소음 Micro-Cooling Fan 의 개발)

  • 김기황;박용민;김진화;이승배
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.961-966
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    • 2001
  • Micro fans of randomly swept-blades were designed to provide C.P.U. in a personal computer with effective cooling in a very quiet mode. The proto--type axial micro-fans machined by a laser sintering machine were tested against manufactured products by comparing the performance and overall sound pressure level with spectral measurements in an environment suggested by ASHRAE and ANSI standards. The predicted OSPLs and directivity patterns of fans by iDesignFan software were in good agreements with measured data. The newly introduced fans of randomly swept-blades were proved to provide a very promising mode of low noise at small loading conditions.

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Thermal Characteristics of a Partition Supply System

  • Jeong, Ky-Bum
    • International Journal of Air-Conditioning and Refrigeration
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    • v.11 no.2
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    • pp.67-72
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    • 2003
  • A partition integrated air supply system can provide highly personalized environmental control. The supply air is brought up through raised floors and supplied to outlets located on the partition panels. The purpose of this paper is to find out the best design of outlets for optimal occupant comfort within a personal task area. Real scale experiments were conducted to allow for comparisons of outlet designs within a personal task area. Experimental results indicate that the location of an outlet is the most critical factor in improving the efficiency of supply air distribution of a personal task area. Thermal characteristic comparisons were made between the under-floor and the partition supply systems. Experimental results suggest that the partition supply system is more efficient than the under-floor supply system in terms of cooling. Such a system allows occupants to personally control their immediate environment, resulting in higher productivity.

The application of separate type thermosyphon for cooling of electronic equipments (전자 장비 냉각에 있어서의 분리형 써모사이펀의 적용)

  • Kim J.H;Park S.B.;Yoon J.H.;Kim S.P;Jun C.H
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.725-728
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    • 2002
  • A separate type thermosyphon can be utilized as a cooling device of electronic equipments (such as CPU of a personal computer or notebook). This study was carried out to investigate the cooling effect of separate type thermosyphon and to find the adequate parameters affecting the separate type thermosyphon. The heat transfer characteristics of separate type thermosyphon were obtained from experimental results. A $50{\times}50{\times}2 mm$ heat source was copied after CPU for the experiments. The results indicate that the device is capable of dissipating 60W of thermal energy and keeping the heat plate surface temperature under 50'E and the device can transfer heat from the evaporator to the condenser through natural circulation (without any external driving forces). Some transport phenomena of the working fluid and the heat transfer characteristics of the loop were observed in the experiments and are discussed in detail below.

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Study on Indoor Thermal Environment Controlled by Portable Cooler (실험을 통한 이동형 냉방기의 실내 온도분포 특성의 검토)

  • Choi, Dong-Kyun;Song, Doosam;Kim, Jung-Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.28 no.2
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    • pp.49-54
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    • 2016
  • The purpose of this study is to analyze the indoor temperature distribution of a room controlled by a personal and portable cooler. As an energy saving strategy, the personal air-conditioning or task conditioning system was developed and installed in office buildings in the 90 s. Many research results regarding the personal air-conditioning (PAC) system were focused on thermal comfort, localized ventilation efficiency and energy savings. However, the conventional PACs were only developed for application in office buildings. In this study, as a type of PAC, a portable cooler was analyzed in terms of indoor temperature distribution changes with the passage of time. The measurement was performed in a bedroom in an apartment house. The results showed that indoor temperature was controlled at about $24^{\circ}C$ around the human body. However, the ambient zone up to 1.5 m away from the the human body stayed at about $27.5^{\circ}C$.