• Title/Summary/Keyword: Environment chamber

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Assessment of Organic Compounds Emission from Consumer Products in an Environmental Chamber System

  • Jo, Wan-Kuen;Lee, Jong-Hyo;Lim, Ho-Jin;Kwon, Ki-Dong;Jeong, Woo-Sik
    • Journal of Korean Society for Atmospheric Environment
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    • v.23 no.E2
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    • pp.39-46
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    • 2007
  • In order to present the scientific information of organic emissions from consumer products available, the current study examined the emissions composition for three different types of consumer products being used in Korea in an environmental chamber: air freshener (AF), mosquito repellents (MSQR), and moth repellents (MTHR). Emission rates were evaluated by determining emission rates of the target compound from the selected products using an electropolished stainless steel (SS) test chamber $(40{\times}25{\times}50cm^3)$. A time-dependent empirical relationship developed in this study agreed well with the test results. As same with the emission concentrations, MSQR exhibited the highest emission rate for all target compounds except for limonene and naphthalene. MTHR ($9,200\;{\mu}g\;h^{-1}$) showed the highest emission rate of naphthalene followed by MSQR ($8,300\;{\mu}g\;h^{-1}$). Moreover, the concentrations in residential bedroom conditions for target compounds emitted from three types of consumer products were estimated. This estimation suggests that the uses of consumer products can elevate indoor levels of target compounds. In particular, any types of the consumer products may increase the indoor level of m, p-xylene.

A Validation Model for the Statistical Power Balance Method Using a Reverberation Chamber

  • Lee, Young Seung;Choi, Sung Woong;Park, Seung Keun
    • Journal of electromagnetic engineering and science
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    • v.13 no.3
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    • pp.192-194
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    • 2013
  • This paper proposes a validation model using a reverberation chamber for verification of the effectiveness and accuracy of the statistical power balance (PWB) method. The PWB method treats electromagnetic (EM) field distributions in certain environments as a representative value of an "ensemble" average, so a reverberation chamber is utilized as a testing apparatus to experimentally simulate the sets of measurement field "ensemble" inside a complex environment. Measurements are performed with various test conditions for environmental loss using flat absorbers, and front and side doors of the chamber. Comparison between the PWB analysis and the measurement results shows good agreement, indicating the usefulness of this statistical analysis method for stating the electromagnetic field inside the EM zone as a representative value to general structures.

A Study on the Evaluation of Semi-Anechoic Chamber Characteristics (전파반무향실의 특성평가에 관한 연구)

  • 김민석;김동일
    • Journal of the Korean Institute of Navigation
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    • v.21 no.4
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    • pp.29-38
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    • 1997
  • Because of the result of a large use of electronic equipments, the occupation density of microwave frequency band is highly increased, and electromagnetic environment is getting more seriously bad. It is sometimes reported that electronic machines are not normally operated on account of the influence of undesired electromagnetic wave, which often gives fatal blow to even human life and thus becomes serious social problems. OATS(Open Area Test Site) is principally used to measure EMI or examine elelctromagnetic emission. Because of various restrictions we often build semi-anechoic chamber which has the function of OATS to measure EMI or EMS other than OATS. If the difference of the site attenuation between semi-anechoic chamber and OATS is within ${\pm}3dB$, the semi-anechoic chamber is recognized as adequate facility to measure EMI or EMS. Accordingly authors evaluate and analyze site attenuation due to absorbent materials, polarization, mutual coupling effects, etc. The calculated and the measured site attenuation in semi-anechoic chamber are compared. As a result good agreement is obtained.

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Formation and Growth of Atmospheric Aerosols by Water Vapor Reactions in an Indoor Smog Chamber (스모그 챔버에서 수분 반응에 의한 대기 에어로졸의 생성 및 성장)

  • Kim Min Cheol;Bae Gwi-Nam;Moon Kil-Choo;Park Ju-Yeoun
    • Journal of Korean Society for Atmospheric Environment
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    • v.20 no.2
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    • pp.161-174
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    • 2004
  • Aerosol formation and growth by water vapor reactions were investigated in a 2.5 -㎥ indoor smog chamber filled with the unfiltered ambient air. The relative humidity of test ambient air was elevated at 59~64% or 84~88% by adding water vapor. The aerosol number size distribution and the concentrations of $O_3$, NO, NO$_2$, and SO$_2$ were measured during the experiments. The $O_3$ and NO$_2$ gases were well reacted with the water vapor at high relative humidity of 84~88%, and the reaction rates of these gases seemed to be decreased at low relative humidity of 59~64%. The formation and condensational growth phenomena of ambient aerosols by water vapor reactions were observed in a Teflon bag, depending strongly on the initial particle size distribution. The water vapor reactions might be affected by the contents of oxidants produced by photochemical reactions under sunlight.

Evaluation of an Ammonia Passive Sampler Using Chamber System

  • Yim, Bong-Been;Kim, Sun-Tae
    • Journal of Korean Society for Atmospheric Environment
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    • v.22 no.E1
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    • pp.1-8
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    • 2006
  • The purpose of this study was to evaluate the efficiency of a passive sampler in measuring atmospheric ammonia concentrations using chamber system. The ability of the passive sampler to quantitatively determine atmospheric ammonia gas was almost identical to that of the reference method (indophenol method). There was no significant difference between concentrations measured by the two methods. The detection and quantification limits of the ammonia passive sampler were 16.9 ppb and 25.3 ppb, respectively, for a 24-h sampling period. The average coefficient of variation between replicated samplers was $6.7{\pm}4.2%$. The concentrations measured by the two methods (passive sampler and indophenol method) were no significant difference with good a correlation (correlation coefficient=0.964).

Development of Three D.O.F Alignment Stage for Vacuum Environment (진공용 3자유도 얼라인먼트 스테이지 개발)

  • Han, Sang-Jin;Park, Jong-Ho;Park, Hui-Jae
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.11
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    • pp.138-147
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    • 2001
  • Alignment systems are frequently used under various semiconductor manufacturing environment. Particularly in PDP(Plasma Display Panel) manufacturing process, the alignment system is applied to the combining and sealing processes of the upper and lower glass panels of PDP, where these processes are performed in the vacuum chamber of high vacuum and high temperature. In this paper, the XYΘ-alignment stage is developed to align PDP panels. Because of high vacuum and high temperature environment, the alignment chamber has been designed to isolate the inner part of the alignment chamber from the outer environment of high vacuum and high temperature, in which every part of the alignment stage is inserted. As it is difficult to attach feedback sensors to the alignment stage in the alignment chamber, the alignment stage is implemented with the open loop algorithm, where the parallel link structure has been designed using step-motors and ball-screws for structural simplicity. The kinematic analysis is performed to drive the parallel link structure, based on the experiments of actuation-compensation of the alignment stage. For the error compensation, the hyperpatch model has been used to model the errors. From the experiments, the positional accuracy of the alignment stage can be improved significantly.

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Construction of a Thermal Vacuum Chamber for Environment Test of Triple CubeSat Mission TRIO-CINEMA

  • Jeon, Jeheon;Lee, Seongwhan;Yoon, Seyoung;Seon, Jongho;Jin, Ho;Lee, Donghun;Lin, Robert P.
    • Journal of Astronomy and Space Sciences
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    • v.30 no.4
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    • pp.335-344
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    • 2013
  • TRiplet Ionospheric Observatory-CubeSat for Ion, Neutron, Electron & MAgnetic fields (TRIO-CINEMA) is a CubeSat with 3.14 kg in weight and 3-U ($10{\times}10{\times}30$ cm) in size, jointly developed by Kyung Hee University and UC Berkeley to measure magnetic fields of near Earth space and detect plasma particles. When a satellite is launched into orbit, it encounters ultra-high vacuum and extreme temperature. To verify the operation and survivability of the satellite in such an extreme space environment, experimental tests are conducted on the ground using thermal vacuum chamber. This paper describes the temperature control device and monitoring system suitable for CubeSat test environment using the thermal vacuum chamber of the School of Space Research, Kyung Hee University. To build the chamber, we use a general purpose thermal analysis program and NX 6.0 TMG program. We carry out thermal vacuum tests on the two flight models developed by Kyung Hee University based on the thermal model of the TRIO-CINEMA satellite. It is expected from this experiment that proper operation of the satellite in the space environment will be achieved.

Development of Constant Delivery Micro Pump in a Variable Pressure Environment for Intrathecal Drug Administration System (레져버에 압력이 가해지는 환경에서의 미소 정량 토출 펌프의 개발)

  • Lee, Tae Gyeong;Lee, Cheol Su;Jung, Yu Seok;Park, Gyeong Geun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.26 no.4
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    • pp.387-394
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    • 2017
  • This paper develops a pump system for patient with chronic pain or cancer. The pump module is consists of two micro-valve and membrane. The micro-valve is operated by a solenoid. With two solenoid valves which are connected via a drug transport line, the inlet and outlet are completely blocked. A silicon rubber membrane located between the two valves makes the flow-rate constant without any backflow. This pump module can control the flow-rate of drugs by controlling the time that the valves are opened and closed. The reservoir consists of a drug chamber and a gas chamber. As the gas chamber encloses the drug chamber, propellant gas which is injected into the gas chamber pressurizes the drug chamber regardless of volume of the drug chamber. To design the pump module, analysis a constant efficiency test, and accuracy test for the pump module were conducted.

Performance Evaluation of Multidrop Chamber Ventilation System in Apartment (공동주택 적용을 위한 다분기챔버 환기 시스템의 성능평가에 관한 연구)

  • Kim, Sung Soo;Sohn, Jang yeul
    • KIEAE Journal
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    • v.9 no.4
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    • pp.17-22
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    • 2009
  • It is common to design the duct branches where to supply the required air flow for individual room in residential apartment house. However it is difficult to adjust the air volume adequately in small air duct branches in residential ventilation system. The purpose of this study is to figure out the performance of Multidrop chamber coupling system for the residential ventilation system. The experiments were designed to simulate apartment of $84m^2$ and established multidrop chamber duct and general duct on the ceiling of the apartment. Distribution performance of air supply rate were evaluated in this experiments. As a result, distribution performance of air supply rate in the general duct is different from designed air supply rate by about 35% ~ 50% and about 10% in the multidrop chamber system. In additional the sound insulation performance of the multidrop chamber system decreased about 20% compared with general duct system. Therefore, the multidrop chamber system is considered to satisfy proper air supply rate of each room and to improve the sound insulation performance in apartment Houses.

Development the protective clothing for a dropworts cropping workers (미나리 작업자를 위한 작업복 개발에 관한 연구)

  • 최정화;백윤정
    • Journal of the Korean Society of Clothing and Textiles
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    • v.24 no.8
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    • pp.1266-1275
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    • 2000
  • This study was to research the actual condition of a dropworts working environment and to develope the clothing to reduce the work road. The actual conditions of working environment, working position and clothing were surveyed. Experiments were performed in the chamber and in the field. In the chamber, rectal temperature, 11 points skin temperatures(forehead, chest, abdomen, upperarm, forearm, dorsum manus, palm, thigh, calf, dorsum pedis and pelma), heart rates, microclimates inside clothing on the chest and subjective sensations were measured for comparing between 2 different types o garments. In the field, rectal temperature, abodomen skin temperature, 3 points microclimates inside clothing(chest, back and thigh), heart rates, the volume of EMG and subjective sensations were measured. The results were as follows; 1. There were no significant differences in rectal temperature between a old type protective clothing and a new type both in the chamber and the field. 2. Subjects wearing a old type clothing responded \"a little cold\", \"a little uncomfortable\" and subjects wearing a new type protective clothing responded \"normal\", \"comfortable\" both in the chamber and the field. 3. In the field test results, abodemen skin temperature in a old type clothing was higher and microtemperatures inside clothing of chest, back and thigh in a new type protective clothing were higher. 4. The volume of EMG was lower in the new type protective clothing than in the old one.protective clothing than in the old one.

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