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이동규(D.G.Lee),천원기(W.G.Chun),강용혁(Y.H.Kang),곽희열(H.Y.Kwak) 한국태양에너지학회 1999 한국태양에너지학회 논문집 Vol.19 No.3
본 논문에서는 난방용 축열보드에 응용하기 위해서 미세캡슐을 함유한 축열블럭의 열성능 특성을 조사하였다. 상변화 물질인 CH₃COONa·3H₂O를 미세캡슐 형태로 제조하였고 미세캡슐 함유량이 각각 10%, 20%가 되도록 시멘트 몰타르와 혼합하여 축열블럭을 제작하였다. 축열블럭의 축열 및 방열 특성을 분석하기 위하여 유량과 유입 냉각 온도를 변화시켰다.<br/> 실험결과를 보면 미세캡슐 함유량이 증가할 수록 블럭에 축열되는 축열량은 증가를 하였고 방열시간도 증가를 하였다. 그리고 방열과정시 유량이 증가하고 유입 냉각온도가 감소함에 따라 방열시간은 감소하였다.<br/> 순수블럭(0% 미세캡슐 함유량)은 방열과정시 총괄 열전달 계수는 시간에 따라서 일정하게 유지를 하지만 축열블럭에서는 시간이 지남에 따라 증가를 하였다. The thermal performance of storage brick, containing microencapsulated PCM (phase change material), was investigated for utilization as a floor heating system. Sodium acetate trihydrate (CH₃COONa·3H₂O) was selected for the PCM and was encapsulated. The thermal storage brick was manufactured with mixing cement mortar having 10%, 20% PCM contents, respectively.<br/> Four different flow rates and three different cooling temperatures was used in this work for analyzing the heat charging and discharging characteristics of the thermal storage brick.<br/> The result showed that cycle time was shortened as the PCM content was increased and as the mass flow rate was increased. The same effect was obtained when the cooling temperature was decreased. For each thermal storage brick the overall heat transfer coefficient (U-value) was constant for a 0% brick, but was increased with time for the bricks containing microencapsulated PCM.
이동규(D. G. Lee),윤종수(J. S. Yoon),이상호(S. H. Lee),금종수(J. S. kum),정석권(S. K. Jeong) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with fuzzy controller design for ventilation control of tunnel. The design for ventilation control of tunnel basically requires nonlinear control because of many irregular factors of the tunnel. Therefore, fuzzy control as nonlinear controller is usually applied to the tunnel system which has nonlinear characteristics. First, basic fuzzy principles are explained, and fuzzy controller for tunnel ventilation is designed supposing that normal traffic flow by using the fuzzy principle. In general, both carbon monoxide and exhaust gas are considered as control quantities in the ventilation control. However, we just considered only exhaust gas as control quantity because exhaust gas is more important control factor than carbon monoxide. Next, we investigated unexpected traffic jam which may be caused in tunnel right after tunnel open. The abnormal traffic makes worse pollution concentration in tunnel. A spare controller is prepared to cope with the problem. Finally, some simulation results showed good control performance.
전류정보를 이용한 가변속냉동시스템의 응축기 오염 On-line 고장진단
이동규(D. G. Lee),고대권(D. K. Koh),정석권(S. K. Jeong) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, on-line fault detection and diagnosis(FDD) of condensor fouling in a variable speed refrigeration system based on current information is introduced. An inverter and feedback control are essential to a variable speed refrigeration system for energy saving. RPM of a compressor and opening angle of an electronic expansion valve are changed by feedback control. Hence, pressure and temperature information for on-line FDD are insufficient due to compensation effect of the feedback control. Therefore this paper suggests utilization of the current information which is measured from an inverter for FDD. First, experimental equipment and method of data collection for regression analysis about the current information are represented. Then a regression equation about the current information is generated. Next, we show that the pressure and temperature information are insufficient due to compensation effect of feedback control. Finally, usefulness of the residual information between detected current and estimated current based on the regression equation is verified through some experiments.