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A study on 65 % potential efficiency of the gas turbine combined cycle
권현민,문성원,김동섭,강도원,손정락,이정호 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
This study investigates the possibility of achieving 65 % efficiency in a gas turbine combined cycle. Several options to realize it were compared. A sensitivity analysis was performed for the latest H-class gas turbine in a simple cycle to quickly and easily predict the performance variation due to changes in each design parameter. When each design parameter was improved by the same percentage, the combined cycle efficiency was maximized by the improvement in turbine efficiency. The degree of increase in the combined cycle power was the largest when improving the turbine inlet temperature (TIT). To realize the turbine industry’s goal of 65 % efficiency in the combined cycle, the efficiency of the compressor and the turbine should be improved by 2 %, the TIT should be increased by 100 o C, and the pressure ratio should be increased from 23 to 32 in comparison to current H-class gas turbines. The possibility of improving the cycle performance was also investigated through modifications of the gas turbine cycle, such as reheating, inter-cooling, and recuperation. When reheating and recuperation were adopted simultaneously, a cycle efficiency of 65 % was possible with an increase of 1 % in both the compressor and turbine efficiencies, which is a moderate and practical improvement.
Synthesis of bio-polyol based on cardanol and preparation of antimicrobial bio-polyurethane
권현민,차상호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Among the extracts from cashew nut shell liquid (CNSL), cardanol has 1 to 3 double bond containing unsaturated chains in the meta position of reactive benzene rings and phenol groups. This is a resource that can produce new functional materials for various polymers. Bio-polyols synthesized using cardanol have been used in various applications of polyurethane. Therefore, biopolyol was synthesized via two step reaction process of the hydroxyl group of cardanol. To compare with bio-polyol, PEG was used as control material. The chemical structure of the bio-polyol using cardanol was analyzed by H-NMR and FT-IR. The thermal stability of the bio-polyol was analyzed by TGA and DSC. The prepared polyurethanes according to the ratio of bio-polyol and PEG were analyzed by FT-IR. TGA, gel content,water absorption, and antibacterial tests were then conducted to investigate the effect of bio-polyol on polyurethanes.
붉나무와 참죽나무 추출물을 이용한 딸기 흰가루병 방제 효과
권현민,김종혁,장미하,노일래 경상국립대학교 농업생명과학연구원 2022 농업생명과학연구 Vol.56 No.4
본 연구는 붉나무와 참죽나무 추출물을 이용하여 딸기 흰가루병에 대한 천연 방제제의 방제 효과를 규명하기 위해 수행하였다. 딸기 흰가루병친환경 방제제 개발을 위해 총 30종의 약용작물 추출물로 흰가루병 방제 효과를 시험한 결과 최종적으로 붉나무와 참죽나무 추출물을 선발하였다. 붉나무와 참죽나무 추출물을 단용 처리 시 방제가는 50~70% 범위로 일반 살균제보다 낮았다. 따라서 흰가루병 방제에 효과가 있다고 보고되고있는 규산칼륨과 추출물을 혼용 처리하여 실험한 결과 방제 효과가 살균제와 비슷한 수준의 86%로 증대되었다. 규산칼륨과 추출물의 농도에따른 방제 효과를 확인한 결과, 0.5%의 규산칼륨과 1,000배의 추출물이 적정 농도였다. 살포 횟수에 따른 방제 효과를 규명하기 위해 1회와2회 처리를 실시한 결과 1회 처리 시 방제 효과가 13~14일로 나타났고, 3~4일 간격으로 2회 살포할 경우 30일 가량의 방제 기간을 가져 1회처리보다 방제 효과가 더 우수하여 딸기 수확기 살균제 처리를 할 수 없는 기간에 방제가 가능한 것으로 나타났다.