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정재동,정인성,유호선,이준식,Chung, J.D.,Jung, I.S.,Yoo, H.,Lee, J.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
This paper presents a theoretical model for predicting transient behaviors during storage process of the cool storage system using the R141b clathrate. Introduction of the lumped capacitance method along with a brine reservoir having large thermal capacity yields a set of simplified energy equations. Based on the Arrhenius equation and the known experimental findings, the formation rate of clathrate for which the degree of subcooling is properly accounted is newly developed. An effective nondimensionalization of the model equations facilitates the closure of modeling as well as parametric study. Calculated results for a specific case not only simulate a typical pattern of temperautre variation in the tank successfully, but also agree reasonably well with available data. The effect of each characteristic parameter on the system performance is also investigated. It is revealed that the dominant among relevant parameters are the activation energy of reaction, the degree of subcoling and the initial mass fraction of refrigerant. Finally, the uncertainty associated with modeling of the shaft work variation appears to need further studies.
全在琪,徐榮敎,鄭載東 慶北大學校 1979 論文集 Vol.28 No.-
The promoting effects in the previous papers were obtained on the several Cymbidium varieties by treatment of auxin or kinetin alone. The concentrations of auxin and kinetin promoting growth of mericlones and proliferation of protocorms were chosen. Now, auxin or kinetin alone and in combination were applicated in this experiment to examine the effects on growth of Cymbidium and Cymbidium elcapitan. The results obtained were as follows. ① Survival ratio of Cymbidium wakakusa was higher in auxin alone, while that of Cymbidium elcapitan did in auxin and kinetin combined, but plant height of both varieties was retarded in combined medium with auxin and kinetin. ② Rooting was promoted by addition of growth regulators than control plot, especially, 0.5ppm NAA and 15.0ppm IBA showed high rooting ratio by 100%. ③ 1.0ppm IAA promoted plant height, 0.1ppm NAA, root growth, but protocorm proliferation was good at control and 1.5ppm kinetin in Cymbidium wakakusa, while plant height was higher in 15.0ppm IBA, root growth, in 0.5ppm NAA, and protocorm proliferation, 1.0ppm NAA and 15.0ppm IBA+1.5ppm kinetin in Cymbidium elcapitan.