• Title/Summary/Keyword: 판-관 열교환기

Search Result 4, Processing Time 0.022 seconds

A Study on the Heat Exchanger Fouling Characteristics of Sludge Incinerator at the IronWorks (제철슬러지 소각로 열교환기에서의 파울링특성 연구)

  • 박상일;김정근;김기홍;박용준;조성문
    • Journal of Energy Engineering
    • /
    • v.12 no.3
    • /
    • pp.223-230
    • /
    • 2003
  • A study was performed to measure and analyze the gas-side fouling of heat exchanger to cool the exhaust gas from sludge incinerator at ironworks. The incinerator gas passes through inside of the vertical tubes of heat exchanger to preheat the combustion air. This kind of fouling occurs at the entrance region of the heat exchanger and thus the perforated fouling plate was designed to measure the gas-side fouling and to analyze the particulate deposit. As a result of analysis, the particulate deposition rate was influenced by temperature, particulate composition and size and also the deposition patterns were different according to the location of perforated fouling plate. The computational analysis was performed to obtain the deposition rates at the perforated fouling plate and the calculation showed that the deposition rate was varied with the hole size and particulate size. It was proved that the fouling at the entrance region of heat exchanger could be measured by the perforated fouling plate designed in this study.

A study on theory analysis and CFD simulation for design of high efficiency ceramic exchanger (고효율 세라믹 열교환기 설계를 위한 이론해석 및 CFD시뮬레이션에 관한 연구)

  • Park, Kyung-Seo;Choi, Chong-Gun;Nam, Jin-Hyun;Shin, Doog-Hoon;Jung, Tae-Yong;Park, Sang-Hwan;Kim, Chang-Sam
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
    • /
    • 2008.04a
    • /
    • pp.179-186
    • /
    • 2008
  • 현재 대부분의 산업용 열기관은 효율을 높이기 위하여 연소에 사용되는 공기를 예열하는 방법을 사용한다. 하지만, 산업용 열기관에서 평균적으로 발생되는 $1000^{\circ}C$ 이상의 배기가스는 일반 금속 열교환기에는 적합하지 않다. 이에 반해 세라믹 열교환기의 경우 고온에서 견디는 장점이 있다. 본 연구에서는 기본적인 열교환기 설계 이론을 이용하여 설계프로그램을 제작하였다. 또한 세라믹 열교환기 내 열 유체 거동을 CFD 상용코드인 FlUENT 6.2를 이용한 전산해석을 수행하여 설계결과를 비교 검증하였다. 설계 결과에서 휜의 형태 변화에 따라 열전달율과 온도구배는 무시할 수 있을 정도로 작았으나, 압력강하는 크게 변동되는 결과가 도출되었다. 제한된 모듈 크기에서 휜 간거리는 휜의 두께에 비해 약 3배 이상 클 경우가 적당하며, 판(plate)의 두께는 작을수록 압력손실이 적고, 열전달율이 상승하지만 두께가 너무 얇게 된다면 제작상의 어려움이 생긴다. 향후 연구에서는 단순한 구조에서 벗어나 off-set이나 판형구조를 고려하여 설계함으로서 열전달 면적을 넓히거나 난류유동을 발생시켜 열전달율을 높이는 연구를 진행 할 필요가 있다.

  • PDF

A Computer Simulation for Performance Prediction of Fin-Tube Heat Exchanger under Frosting Conditions (착상조건 하에서 핀-관 열교환기의 성능예측을 위한 컴퓨터 시뮬레이션)

  • Lee, K.S.;Pak, H.Y.;Lee, W.Y.;Lee, T.H.;Lee, S.Y.;Lee, M.R.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.7 no.1
    • /
    • pp.161-170
    • /
    • 1995
  • This study is concerned with the numerical analysis of performance on fin-tube heat exchanger under frosting condition. In this work, tube-by-tube method using LMED is employed. The present results are compared with O'Neal's experimental and numerical results. A standard evaporator model with 2rows-2columns is selected to investigate the effects of the various parameters such as fin pitch, air flow velocity, and humidity. The results show that frost thickness and the amount of frost per unit area decrease as fin-pitch becomes narrower. In the meantime, frost thickness and accumulation rate increase with higher inlet air humidity. It is shown that heat transfer rate increases during 30minutes and then it decreases. Heat transfer rate and the amount of frost increase with air velocity, however frost thickness does not increase over a certain velocity.

  • PDF

A study of geothermal heat dump for solar collectors overheat protection (태양열 집열관 과열방지를 위한 지중열교환기 연구)

  • Hwang, Hyun-Chang;Chi, Ri-Guang;Lee, Kye-Bock;Rhi, Seok-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.17 no.7
    • /
    • pp.616-622
    • /
    • 2016
  • The heating load using solar hot water is lower in summer than in the other seasons. This decreased heating load leads to the overheating solar collectors and related components. To prevent overheating of the solar collectors, air cooling and shading shields were used. On the other hand, it requires additional mechanical components, and reduces the system reliability. The geothermal heat dump system to release the high temperature heat (over $150^{\circ}C$) transferred from the heat pipe solar collectors was investigated in the present study. Research on the heat dump to cool the solar collector is rare. Therefore, the present study was carried out to collect possible data of a geothermal heat dump to cool the solar collector. A helical type geothermal heat exchanger was buried at a 1.2m depth. Experimentally and numerically, the geothermal heat dump was investigated in terms of the effects of parameters, such as the quantity of solar radiation, aperture area of the collector and the mass flow rate. A pipe length of 50m on the geothermal heat exchanger was suitable with a 0.33 kg/s flow rate. The water reservoir was a possible co-operation solution linked to the geothermal heat exchanger.