• 제목/요약/키워드: environmental temperature

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소비자 조사와 착의 실험을 통한 온도감응형 기능성 의류개발을 위한 기초연구 (Thermo-sensitive Clothing Development by Consumer Investigation and Wearing Test)

  • 상정선;정경화;박주현;오경화
    • 한국의류산업학회지
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    • 제19권1호
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    • pp.90-100
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    • 2017
  • In this research, consumer awareness investigation and wearing test were carried out for obtaining useful data on the development of thermo-sensitive functional clothing material. A survey involved 216 people in Seoul and Kyeonggi-do, and 200 questionnaires data were analyzed by descriptive statistics and frequency using SPSS 17.0. Four healthy men in twenties were participated for wearing test. Subjects in normal loungewear were exposed to temperature change from the initial temperature $30^{\circ}C$ down to $5^{\circ}C$ for an hour in a climate chamber. The environmental temperature, surface temperature of garment and skin were measured. As a result, most of respondents have all season clothing products such as underwear, hosiery, and jogging suit for loungewear. Also, thermo regulator y functional clothes are frequently used as underwear and sweat shirt. The consumer awareness investigation on thermo regulatory functional clothing showed that the most important key buying factor is quick climate temperature response, easy maintenance, design and cost, in that order. Surface temperature of garment went down with the cooling down of environmental temperature. The lower environmental temperature, the greater temperature difference by body part showed. Skin temperature change by environmental temperature showed similar tendency of garment surface temperature. In comparison between garment surface and body skin, temperature difference became larger under the lower environmental temperature.

Environmental Characteristics of Ondal Cave(I)

  • Byeon, Tae-Geun
    • 동굴
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    • 제85호
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    • pp.18-20
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    • 2008
  • To find out the natural environmental characteristics of Ondal Cave, temperature, humidity, wind speed and water temperature have been investigated. When compared to other caves, in sum, Ondal Cave has shown no significant difference interms of natural environment. Inparticular, Ondal Cave was higher than other limestone caves by 1-2$^{\circ}C$ in terms of water temperature due to high inflow of river water nearby.

기수역 인공하천에서 시공간적 수질분포 특성 연구 (A study on Spatiotemporal Variations of distribution characteristics in Artificial Rivers of the Brackish Water Zone)

  • 김윤정;최옥연;한인섭
    • 한국수처리학회지
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    • 제26권6호
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    • pp.89-97
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    • 2018
  • The purpose of this reaserch is to analyze the charateristics of water quality in space through the operation of ARA River in Artificial Rivers of the Brackish Water Zone. The spatial distribution measured water temperature and salt levels for the surface, middle and deep layers by dividing the four areas of Incheon, Sicheon, Gyeyang and Gimpo. Water temperature did not vary much by water depth and branch, and its purpose is to maintain stable water environment through correlation analysis and operation. To examine the temporal and spatial distribution patterns of the Arachon, we measured DO on the Incheon branch, Sicheon, Gyeyang and Gimpo branch twice a month, and on the surface, the temperature level, The water temperature did not vary much by depth and location, and the water temperature in January and March tended to rise from Incheon to Gimpo, with the average difference of 1.1 degrees during the same period. The salinity difference between Incheon and Gimpo sites was 3.3 psu deep and 5.4 psu deep. In particular, floodgates from July to September are found to be less than 10psu overall, which is considered to be a gas due to the effects of floods and the inflow of Gulpo Stream. D.O. is located in some areas due to summer rains. The hypoxic layer has been identified.Analysis of seasonal data shows that water temperature and DO are strongly correlated in autumn. It was found that the water temperature and salt levels in the fall showed a weak correlation.

Effect of Temperature-increase Rate and Terminal Temperature on the Solubilization of Sewage Sludge using Microwave Irradiation

  • Park, Woon-Ji;Ahn, Johng-Hwa;Lee, Chan-Ki
    • Environmental Engineering Research
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    • 제14권1호
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    • pp.48-52
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    • 2009
  • Solubilization of sewage sludge creates favorable conditions for anaerobic microorganisms to produce biogas. In this paper, we quantify the effect of heating pretreatment on the degree of solubilization of sewage sludge. The pretreatment process was carried out using a lab-scale industrial microwave unit (2450 MHz frequency). Response surface analysis was applied to determine the combination of temperature-increase rate (ramp rate) (2.9 to 17.1 ${^{\circ}C}$/min) and terminal temperature (52 to 108${^{\circ}C}$). Both ramp rate and temperature significantly affected the solubilization degree of sludge. Within the design boundaries, the conditions predicted to maximize the solubilization degree of 15.8% were determined to be 2.9 ${^{\circ}C}$/min and 104${^{\circ}C}$.

용담호 수온성층해석을 위한 유입수온 회귀분석 모형 개발 (Development of the Inflow Temperature Regression Model for the Thermal Stratification Analysis in Yongdam Reservoir)

  • 안기홍;김선주;서동일
    • 환경영향평가
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    • 제20권4호
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    • pp.435-442
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    • 2011
  • In this study, a regression model was developed for prediction of inflow temperature to support an effective thermal stratification simulation of Yongdam Reservoir, using the relationship between gaged inflow temperature and air temperature. The effect of reproductability for thermal stratification was evaluated using EFDC model by gaged vertical profile data of water temperature(from June to December in 2005) and ex-developed regression models. Therefore, in the development process, the coefficient of correlation and determination are 0.96 and 0.922, respectively. Moreover, the developed model showed good performance in reproducing the reservoir thermal stratification. Results of this research can be a role to provide a base for building of prediction model for water quality management in near future.

사이클론 집진장치의 내부 온도 변화에 따른 집진효율에 관한 전산해석적 연구 (Numerical Study on the Effect of the Internal Temperature Distribution in the Cyclone Dust Collector)

  • 현대근;장혁상
    • 한국입자에어로졸학회지
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    • 제10권4호
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    • pp.155-162
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    • 2014
  • The internal temperature will change depending on operation conditions and material of cyclone dust collector. This study compares the results of collection efficiency and temperature distribution on the different heat flux at wall of dust collector. The previous researcher's experiment results were used to confirm the reliability of CFD(Computational Fluid Dynamics) model. Based on this verified CFD model, we extended the analysis on the cyclone dust collectors. In CFD study, we used RNG k-epsilon model for analysis of turbulence flow, fluid is air, the velocity at inlet is 10 m/s, the temperature of air is $600^{\circ}C$. Because of the difference of outer vortex and inner vortex temperature, the collection efficiency will reduce with the increase of heat flux, showed the highest collection efficiency at heat insulation.

기온 변화에 따른 팔당호 수온 영향 및 이력현상 (Effect of Air Temperature Changes on Water Temperature and Hysteresis Phenomenon in Lake Paldang)

  • 유순주;임종권;이보미
    • 환경영향평가
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    • 제29권5호
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    • pp.323-337
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    • 2020
  • 국내 최대 상수원인 팔당호를 대상으로 기온과 수온의 변화를 살펴보고 장기간 기온과 수온의 연속 자료를 활용하여 이력 현상을 살펴보았다. 계절 Mann-Kendall을 적용한 팔당호 인근 양평의 기온 변화 추세는 지난 47년간(1973~2019) 증가(0.048 ℃/yr)에 비하여 최근 27년간(1993~2019) 기온의 증가(0.060 ℃/yr)가 컸다. 팔당호와 유입 하천에서 수온은 기온과의 상관성이 높으나(R > 0.9, p < 0.005) 호소인 팔당댐앞 지점에서의 수온은 하천 수온 상승에 비하여 느리고 기온 하강기에 들어서 수온이 서서히 감소하였고 수심 평균 수온도 상승기와 하강기 모두 호소 표층보다 변화가 더디게 나타났다. 이는 호소가 하천보다 수체 규모 면에서 크고 체류시간이 길기 때문에 열에너지를 흡수하고 감소하는데 시간이 걸리는 수온의 이력 현상이 크게 작용하는 것으로 판단된다.

초정밀 가공기를 위한 환경 제어용 셀에 관한 실험 및 해석적 연구 (Numerical Analysis and Experiment of Environmental Control Cell for Ultra-nano Precision Machine)

  • 오상준;김철숙;조지현;김동연;서태범;노승국;박종권
    • 한국생산제조학회지
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    • 제22권5호
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    • pp.824-830
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    • 2013
  • In ultra-precision machining, the inside temperature should be controlled precisely. The important factors are environmental conditions (outside temperature, humidity) and temperature conditions (cutting heat, spindle heat). Thus, in this study, an environmental control cell for the ultra-precision machine that could control the inside temperature and minimize effects of the surrounding environment to achieve a thermal deformation of less than 400nm of a specimen was designed and verified through C.F.D. Further, a method that could control the temperature precisely by using a blower, heat exchanger and heater was evaluated. As a result, this study established a C.F.D technic for the environmental control cell, and the specimen temperature was controlled to be within $17.465{\pm}0.055^{\circ}C$.

외부온도가 수송용 메탄올연료전지 성능에 미치는 영향 (Effects of environmental temperature on the performance of direct methanol fuel cell for vehicles)

  • 한창화;최지선;정대승;한상훈;이중희
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2009년도 추계학술대회 논문집
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    • pp.176-179
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    • 2009
  • The performance of direct methanol fuel cells is affected by operating conditions such as, methanol feeding temperatures, methanol concentrations, and methanol flow rates during the operation in different environmental conditions. In this study, effects of the environmental temperature on performance of direct methanol fuel cells have been investigated in order to test a applicability of direct methanol fuel cell to the vehicle. The environmental temperature (ET) was varied from $-20^{\circ}C$ to $+30^{\circ}C$. The inside fuel cell temperature (CT) during test at various operating conditions was monitored and the performance of fuel cell was measured in the I-V polarization curve. With increasing the ET, the performance of the fuel cell was significantly improved and the CT also almost linearly increased. However, at below $0^{\circ}C$ ET, the DMFC showed very poor performance and needed to control CT or methanol feeding temperature (MFT), methanol flow rate(MFR) to obtain enough power of the vehicle.

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