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화성열병합발전소 DH economizer의 성능개선 연구
변수영(Su-Young Byun),곽승신(Seung-Shin Kwak),백광열(Kwang-Youl Back),양균식(Kyoun Sic Yang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Theoretical performance analysis on DH Economizer in Hwasung CHP was conducted. At first, current operating conditons and logics were examined, and two methods to improve the heat exchange performance were reviewed. One is to change the contorl logic, and the other is to increase heat exchanger capacity. ɛ-NTU analysis was performed to verify the feasibility of two methods. It was found that both methods are effective way to increase heat recovery of DH Economizer in Hwasung CHP.
ZnO와 MnO<sub>2</sub>를 동시에 첨가한 (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> 세라믹스의 압전 특성에 대한 연구
홍영환,박영석,정광휘,조성열,이재신,Hong, Young Hwan,Park, Young-Seok,Jeong, Gwang-Hwi,Cho, Sung Youl,Lee, Jae-Shin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4
We investigated the sintering behavior and piezoelectric properties of lead-free $(K_{0.5}Na_{0.5})NbO_3$ ceramics co-doped with excess 0.01 mol ZnO and x mol $MnO_2$, where x was varied from 0 to 0.03. Excess $MnO_2$ addition was found to retard the grain growth and densification during sintering. However, 0.005 mol $MnO_2$ addition improved the piezoelectric properties of 0.01 mol ZnO added $(K_{0.5}Na_{0.5})NbO_3$ ceramics. The planar mode piezoelectric coupling coefficient, electromechanical quality factor, and piezoelectric constant $d_{33}$ of 0.01 mol ZnO and 0.005 mol $MnO_2$ added specimen were 0.40, 304, and 214 pC/N, respectively.