Abstract
During the experiments, four spherical flasks with n-tetradecane with a total mass of 0.344 kg were placed in a test container inside which an aqueous solution of propylene glycol with a mass concentration of 50% and an initial temperature of 25 °C was circulating. As a result of studies, the values of heat flows at different time intervals during the solid-liquid phase transition of n-tetradecane were obtained. Based on the modeling of the processes, the distribution of temperature and velocity of the heat carrier in the test container as well as the values of the local heat transfer coefficients on the surface of the flasks were established. Numerical calculations of the process of phase transition being studied according to the authors’ model were also performed. Numerical calculations of the process under study have been performed using the authors’ model. A satisfactory convergence of the experimental and calculated values of the heat flow has been obtained. The results can be used in the development of thermal energy accumulators with n-tetradecane.
Highlights
IntroductionNon-stationary liquid-solid-liquid phase transitions are rather common processes. They can be implemented in various technical devices
Non-stationary liquid-solid-liquid phase transitions are rather common processes. They can be implemented in various technical devices. They occur in thermal energy accumulators with phase change materials (PCM) [1, 2]
In comparison with accumulators with liquid, the advantage of thermal energy accumulators with PCM is that they have an order of magnitude higher volume and mass density of stored energy
Summary
Non-stationary liquid-solid-liquid phase transitions are rather common processes. They can be implemented in various technical devices. In comparison with accumulators with liquid, the advantage of thermal energy accumulators with PCM is that they have an order of magnitude higher volume and mass density of stored energy This is due to the fact that in them, the main contribution to the thermal energy accumulation is made by the heat of the phase transition. In [9], an experimental and numerical study for elliptical capsules was carried out In these papers, the determination of such quantities as the total heat flow, primarily necessary for the design of cooling systems, occurs indirectly from the results of calculating temperature fields. Among such substances are paraffins the advantage of which is stability during repeated multidirectional phase transitions, a relatively high specific heat of the phase transition and a slight difference in density in the liquid and solid states
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