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김두현(Doohyun Kim),황유진(Yujin Hwang),박재홍(Jae-Hong Park),정성일(Seong-Ir Chung),정영만(Young-Man Jeong),구본철(Bon-Cheol Ku),이재근(Jae-Keun Lee),안영철(Young-Chull Ahn),방선욱(Sunwook Bang),김석로(Seok-Ro Kim) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.6
The presence of non-condensable gases as an additional thermal resistance inside a refrigerating circuit has been found for a general refrigerator. The effect of non-condensable gases was varied by controlling the injection amount of dry air into the refrigerating circuit to increase a thermal resistance. Energy consumption tests for the refrigerator were conducted under the various amounts of non-condensable gases. The tested refrigerating circuit was the household refrigerator. As the molar fraction of non-condensable gases was increased from 0% to 1.46%, the amount of energy consumption was found to increase up to 25%. The increase of the amount of non-condensable gases in refrigerating circuit was found to result in increasing the condensation temperature at the condenser and decreasing the evaporation temperature at the evaporator, which were presumably caused by the low specific heat and increased partial pressure of non-condensable gas.
김두현(Doohyun Kim) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
In this study, we investigated the correlation between the ignition characteristics, particularly two-stage ignition behavior, and fuel’s octane sensitivity. Using chemical kinetic simulations of 24 Toluene Reference Fuels/ethanol blends, a metric that represents the strength of the two-stage ignition behavior is developed. Regression analysis shows that a fuel with higher octane sensitivity tends to exhibit weaker two-stage ignition characteristics. Based on the correlation, an octane sensitivity prediction method is devised, which will benefit future fuel surrogate development.