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권영철,Gwon, Yeong-Cheol 대한양계협회 2019 월간 양계 Vol.51 No.8
본고는 금년 4월 26일 고려대학교에서 개최된 (사)대한건축학회 춘계학술발표대회에서 한라대학교 권영철 교수가 발표한 '한국의 계절별 계사의 부하 특성에 관한 연구' 내용을 발췌하여 게재하였다. 본 연구는 매년 여름 폭염으로 인한 닭들의 폐사를 줄이고 최적 단열 및 환기 방안을 마려하기 위한 연구의 일환으로 이루어졌다.
권영철 한국기계기술학회 2021 한국기계기술학회지 Vol.23 No.6
In order to study the drying performance of the dryer, the performance characteristics of the heat pump dryer applied a PF heat exchanger is applied were experimentally investigated. The capacity, COP, drain and SMER of the dryer were measured by the refrigerant charge and EEV opening. Heat pump dryers are refrigerant-air systems. For the dryer performance test, an air enthalpy calorimeter was used. From the experimental results, the heat exchanger performances according to the change in the refrigerant charge and EEV opening were the maximum at 0.5kg refrigerant and 30% EEV opening, respectively. In addition, SMER suggested a satisfactory level of drying performance. This shows that the refrigeration cycle of the dryer must be operated at an appropriate refrigerant amount and EEV opening degree to secure optimal drying performance. On the other hand, the time to reach the target setting temperature of the dryer was increased by about 2.5 times depending on with/without the sample.
Existence of Periodic Solutions for Fuzzy Differential Equations
권영철,김정순,황진수,박진한 한국지능시스템학회 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.3
In thispaper,weinvestigatetheexistenceandcalculationoftheexpressionofperiodicsolutionsforfuzzydifferential equations withthreetypesofforcingterms,byusingHukuharaderivative.Inparticular,Theorems3.2,4.2and5.2are the resultsofexistencesofperiodicsolutionsforfuzzydifferentialequations ,aandb, respectively.Theseresultswill help ustostudyphenomenawithperiodicpeculiaritysuchaswaveorsound
권영철 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.5
In the present study, the experimental study was conducted using a multi-calorie meter, to investigate the cooling performance and cycle operation changes of the multi-heat pump (3 indoor units) for the low outside temperature in summer. The test temperature condition was the low cooling temperature, and the normal performance and dynamic behavior of 3 rooms, 2 rooms, and 1 room were measured to understand the operating characteristics of seven 7 indoor unit combinations. As a result of the experiment, the cooling capacity and COP of the multi-heat pump at low cooling temperature were about 10% and 6% higher than those of the cooling standard temperature. In addition, the dynamic behavior of the indoor units of 3 and 2 rooms was observed differently due to the load difference according to the indoor unit combinations and the non-uniformity of the refrigerant amount. And, when starting the heat pump, the compressor had a maximum peak value and stabilized by repeating the decrease and increase for each indoor unit combination.
난방표준 온도조건에서 멀티 히트펌프의 운전특성에 대한 실험연구
권영철 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In the present study, it is conducted to understand the heating performance and compressor operation characteristics according to 7 indoor unit combinations and 3 setting temperatures of the inverter multi-heat pump under heating standard temperature conditions. Heating capacity, COP and compressor frequency are investigated using the multi-calorimeter. The indoor unit combinations are simultaneous operation(A+B+C), partial operation(A+C, A+B, B+C) and independent operation(A, B, C), and the setting temperature is 20, 21, and 30°C. Since the increase in the setting temperature increases the compress frequency, the heating capacity increases, but COP decreases due to the increase in power consumption. The frequency increases as the indoor unit combination capacity increases, and decreases as the setting temperature decreases in the steady state.
Asymptotic Behavior of Solutions for the Delay Semilinear Fuzzy Integrodifferential Systems
권영철,박동근,이부영,황진수 한국지능시스템학회 2010 한국지능시스템학회논문지 Vol.20 No.6
In this paper, we study the asymptotic behavior of solutions for the delay semilinear fuzzy integrodifferential systems on by using the concept of fuzzy number whose values are normal, convex, upper semicontinuous and compactly supported interval in