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하종철,황지환,백인철,정동수 대한설비공학회 2005 설비공학 논문집 Vol.17 No.10
In this study, 2 pure hydrocarbon refrigerants of R1270(Propylene) and R290 (Propane) and 3 binary mixtures composed of R1270, R290 and R152a were tested in a refrigerating bench tester with a scroll compressor in an attempt to substitute R502 used in most of the low temperature applications. The test bench provided 3∼3.5kW capacity and water and water/glycol mixture were employed as the secondary heat transfer fluids. All tests were conducted under the same external conditions resulting in the average saturation temperatures of -28 and 45℃ in the evaporator and condenser, respectively. Test results showed that all refrigerants tested had 9.6∼18.7% higher capacity and 17.1∼27.3% higher COP than R502. The compressor discharge temperature of R1270 was similar to that of R502 while those of all other refrigerants were 23.7∼27.9℃ lower than that of R502. For all alternative refrigerants, the amount of charge was reduced up to 60% as compared to R502. Overall, these alternative refrigerants offer better system performance and reliability than R502 and can be used as long term substitutes for R502 due to their excellent environmental properties.
세계중요농업유산기반의 관광개발에 대한 지역주민의 애착도, 관광영향인식, 관광개발참여 및 관광개발지지 간의 영향관계에 관한 연구
하종철,김현지 (사)한국관광레저학회 2022 관광레저연구 Vol.34 No.3
This study aims to understand the relationship between tourism impact perception, development participation, and support intention of local residents on tourism development using Global Important Agricultural Heritage as tourism content. The survey was conducted on residents of Hadong for a month in October 2019, and the final 160 copies were used for empirical analysis of this study. For data analysis, exploratory factor analysis (CFA), and structural equation modeling (SEM), bootstraps were performed to analyze direct and indirect effects between variables. As a result, attachment has a positive significant effect on positive perception in relation to tourism development impact perception. Second, both positive and negative perceptions of tourism development have a significant influence on participation in tourism development. Third, as a result of applying the bootstrap to measure the direct and indirect effects between each path, it can be seen that only three paths: attachment→positive→participation→support path, attachment→positive→support path, and attachment→participation→support path show significant mediating effects.