• Title, Summary, Keyword: condensed water

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A Study on the Solar Distillation in a Cube with Tilted Angles (경사진 육면체에서의 태양열에 의한 증발효과에 대한 연구)

  • Park, Yeong-Hoon;Kim, Byung-Chul
    • Journal of the Korean Solar Energy Society
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    • v.24 no.1
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    • pp.13-19
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    • 2004
  • Four solar stills that were fabricated each with cubes and glazing tilted angles of $15^{\circ},\;30^{\circ},\;45^{\circ},\;60^{\circ}$, were compared with the quantities of condensed water. The quantifies of condensed water were analysed with the weather conditions and temperatures for three months. On fine days, the quantify of average condensed water was more similar to those of $15^{\circ}$ and $30^{\circ}$ than to those of $45^{\circ}$ and $60^{\circ}$. The quantity of condensed water produced by those of $45^{\circ}$ and $60^{\circ}$ were very irregular compared to those of $15^{\circ}$ and $30^{\circ}$. On rainy days, the quantify of condensed water was the most in that of $30^{\circ}$ than those of the other angles and in cloudy, rainy and sunny conditions, the condensation quantify was the largest in that of $60^{\circ}$.

Effect of Waste Heat Recovery Condensing Boiler with Condensed Water Recirculation Function (응축수 순환이 폐열회수 응축형 보일러 성능에 미치는 영향)

  • Keum, Kuk Bin;Kim, Sooik;Yu, Byeong-Hun;Lee, Chang Eon
    • 한국연소학회:학술대회논문집
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    • pp.201-204
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    • 2015
  • Recently, energy excessive consumption and environmental pollution are the social issued. The most efficient way to solve both energy excessive consumption and environmental pollution is existing combustion system improved. This study was part of the assume and commercial used existing waste heat recovery condensing boiler to low emission performance for exhaust gas recirculation(EGR) and thermal efficiency rise by applying the condensed water recirculation(CWR) conducted. The researchers applied the EGR and CWR develop a new concept for the condensed water recirculation waste heat recovery condensing boiler. Waste heat recovery condensing boiler applied to the condensed water recirculation thermal efficiency of the same conditions was increased by about 4.8~5.5% and pollution emission also decreased.

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A numerical study on the flow characteristics and condensed water inflow in the Venturi tube with T-branch tube (T-분지관이 부착된 벤튜리관의 유동특성과 응축수 유입에 대한 수치해석 연구)

  • Kim, S.I.;Park, S.H.;Hwang, J.G.
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.2
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    • pp.173-181
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    • 2019
  • This study was carried out numerically to investigate the flow characteristics in the Venturi tube with $90^{\circ}$ T-branch tube and the inflow of condensed water into the Venturi tube from the branch tube. In this study, the diameter of the branch tube(1, 2, 3mm) and the neck diameter of the Venturi tube(0.3, 0.9, 1.5mm) were varied. The flow rate of the water at the Venturi tube inlet is 80cc/min and the water temperature is 288K. The condensed water temperature at the branch tube inlet is 355K. It was found that the velocity and pressure of the fluid near the branch point in the Venturi tube were more dependent on the diameter of the Venturi tube than the diameter of the branch tube. The temperature of the mixed water at the exit of the Venturi tube was the highest when the Venturi tube's neck diameter is 0.9mm and the branch tube diameter is 2mm. This means that the condensed water is flowing well through the branch tube.

A Study on the Solar Distillation in a Cube with Tilted Angles (경사진 육면체에서의 태양열에 의한 증발 현상에 대한 연구)

  • Park, Yeong-Hoon;Kim, Byung-Chul
    • Proceedings of the KSME Conference
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    • pp.1424-1429
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    • 2004
  • Distillation is one of many processes that can be used for the purification of water. It requires an energy input such as heat and solar radiation is a possible source of energy. In this process, water is evaporated, thus separating water vapor from the solute. The vapor is then condensed to pure water. The temperature of the water, the cavity of the enclosure and the surface of the glass was measured everyday. Fifteen points were chosen for the temperature measure using a thermocouple. The inner wall and the bottom of each still was painted black for good absorption of heat. The enforced glass was used for the cover for the entering of solar energy. The size of all of the water baths was the same, but the glass of the rectangular form had a tilted angle. In the case of fine or general weather, the volume of condensed water produced by $45^{\circ}$ and $60^{\circ}$ is very irregular compared to that of $15^{\circ}$ and $30^{\circ}$, In case of a rainy day, the occurrence of the volume of condensed water was similar to that of $15^{\circ}$ and $30^{\circ}$, but the volume of condensed water produced by $30^{\circ}$ was the highest.

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The Study on the Corrosion Behavior of STS 304 for Gas Boiler in the Condensed Water (응축수 중에서 가스보일러용 STS 304의 부식거동에 관한 연구)

  • Du Yun Byoung;Lim Uh Joh;Jeong Ki Cheol
    • Journal of the Korean Institute of Gas
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    • v.9 no.1
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    • pp.21-25
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    • 2005
  • This paper was studied on the corrosion behavior of STS 304 for gas boiler in the condensed water, the electrochemical polarization test of STS 304 for gas boiler in the condensed water was carried out. And the corrosion behavior of STS 304 was considered. The main results are as following: 1) As corrosion environment is acidified from neutrality, the polarization resistance of STS 304 decreases and the corrosion potential is less noble. 2) The corrosion reaction mechanism of STS 304 is cathodic control. 3) As corrosion environment is acidified, the passive potential range of STS 304 decreases. Also, the passive current density of STS 304 increases.

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Circuit Modeling and Simulation for Thermoelectric Cooling System using Condensed Water (응축수를 활용한 열전 냉각장치의 회로 모델링 및 시뮬레이션)

  • Lee, Sang-Yun;Jang, Sukyoon;Park, Mignon;Yoon, Changyong
    • Journal of Korean Institute of Intelligent Systems
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    • v.25 no.2
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    • pp.161-167
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    • 2015
  • In this paper, a novel thermoelectric cooling system utilizing condensed water is introduced and its electrical equivalent circuit model is proposed. The introduced system can deals with the condensed water and improves efficiency by spraying the condensed water on heat sink. The electrical equivalent circuit model is derived by combining the circuit model of the classical thermoelectric cooling system with equation of heat exchange. Because the parameters of the model can be defined from not other experimental data but just the data sheet of the thermoelement, the model can be useful to design and develop the controller of the proposed system. We verify that the proposed model is valid and the introduced system is more efficient than the previous thermoelectric cooling system through simulations.

Examination about evaluation method of odor active compounds in evaporator by using condensed water (응축수를 이용한 냉각기의 냄새원인물질 평가방법 검토)

  • Kim, Sun-Hwa;Kim, Kyung-Hwan;Jung, Young-Rim;Kim, Man-Goo;Kim, Jae-Ho;Park, Ha-Young;Ji, Yong-Jun
    • Analytical Science and Technology
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    • v.20 no.5
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    • pp.361-369
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    • 2007
  • Uncomfortable odor emitted from air conditioning system is the main cause of indoor air quality deterioration. To solve evaporator odor problems, odor active compounds, have to be identified then the quality of the product can be improved its quality. Because evaporator odor in exhaust gas has low odor intensity and discontinuity, it is very difficult to collect and analyze sample. In this study through the identification of odor compounds in condensed water, the evaluation of the eraporator was tested. Odor compounds were extracted from water by headspace-solid-phase microextraction (HS-SPME) method. The single odor was separated by GC/FID/Olfactometry (GC/FID/O) and odor active compounds were identified by GC/AED and GC/MS. Compared to air sample, result of sensory evaluation and the single odor compound appeared similarly. It was identified that odor active compounds have functional group containing oxygen such as alcohols and acids. Evaluation method of odor active compounds using condensed water in evaporator appeared effective on the side of simplicity of collection, low expanse and rapid analysis.

RELAP5 Analysis of a Condensation Experiment in an Inverted U-tube

  • Park, Chul-Jin;Lee, Sang-Yong
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.383-388
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    • 1995
  • Two-phase transient phenomena in the noncondensable gas-filled closed loop was investigated numerically using the RELAP5/MOD3 version 3.1 computer code. The condensation heat transfer correlation for noncondensable gases was studied in detail. Two modes of the reflux condensation which can be characterized by countercurrent flow of steam and its condensed water and the oscillatory between reflux condensation and natural circulation were predicted well. However, the natural circulation mode which the condensed water carried over the U-bend concurrently with steam was failed to predict.

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Water Sorption/Desorption Kinetics and Convective Drying of Eucalyptus globulus Wood

  • AMER, Mahyoub;KABOUCHI, Bousselham;El ALAMI, Salah;AZIZE, Brahim;RAHOUTI, Mohamed;FAMIRI, Abderrahim;FIDAH, Abdelwahed
    • Journal of the Korean Wood Science and Technology
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    • v.47 no.5
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    • pp.557-566
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    • 2019
  • Radial and tangential water diffusion in Eucalyptus globulus wood was investigated using three mature trees from a forest in Khemis Sahel (North Morocco). Absorption and desorption kinetics experiments were conducted at ambient temperature ($25^{\circ}C$) and $30^{\circ}C$, respectively, and a relative humidity of 60%. The diffusion coefficients in the two directions were determined under imposed hygrothermal conditions; they were greater in the radial direction for the absorption as well as desorption processes. Convective drying under load, preceded by reconditioning and followed up by balancing, revealed the drying conditions that corresponded to the appropriate drying schedules for E. globulus wood. This was verified by measuring the cracks and bowsbefore and after drying of boards.