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김시범,김효경,Kim, Si-Peom,Kim, Hyo-Kyung 대한설비공학회 1982 설비저널 Vol.11 No.2
An experimental study on the storage tank which uses sensible heat of water is done. The influence of inlet flow rate (Re), the difference between initial temperature and inlet water temperature(Gr) and the location of inlet and outlet on the performance of storage tank is studied. Development of stratification is examined by measuring the transient temperatures of 36 points inside the tank. Measured values are transformed to the dimensionless parameters in order to calculate the temperature efficiency of storage tank. In the presence of combined natural and forced convection, the development of stratification becomes clearer and thus the efficiency becomes higher, as $Gr/Re^2$ increases.
장병현(Byung-Hyun Jang),김시범(Si-Peom Kim),이권희(Kwon-Hee Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
The shell & tube heat exchanger is used throughout various industries because of its inexpensive cost and handiness when it comes to maintenance. However, it has many design elements such as the location and the shape of inlet and outlet, the numbers of tubes and baffles, etc. Also, the flow within the shell and the heat transfer are complex. This paper is performed numerical analysis to evaluate capabilities of difference in temperature and pressure drop, which are the performance of channel heat exchanger, one of different types of shell & tube exchanger. Also, factors that affect the performance of channel heat exchanger were selected through design of experiment along with key factors.
金施帆 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.1
A study is performed on the improvement of the rate of thermal energy storage in the phase change material. The storage unit is a double tube type heat exchanger : air in the inner tube and phase change material in the outer tude. The relevant conservation equations with the boundary conditions have been solved to obtain the temperature distribution and the phase change front from which the storage rates have been calculated. In the heat storage process, the heat storage ratio η_(S1) as the ratio of the energy stored in a fixed time to the heat storage capacity of the unit, and η_(S2), as a timeaveraged dffectiveness of the storage unit, are defined. η_(S1), is increasing as mass flow rate and volume fraction of the scrap is increased, and n_(S2) is increasing as mass flow rate is decreased and volume fraction of the scrap is increased. In the heat release process, the heat release ratio η_(r), as a measure of decreasing heat transfer rate, is defined. η_(r) is increasing as volume fraction of the scrap is increased and the mass flow rate is decreased. The effect of increased effective thermal conductivity due to scrap mixing is more significant in the heat release process than in the heat storage process.