含多孔骨架儲(chǔ)能材料的相變傳熱特性研究
[Abstract]:Under the background of energy crisis, fossil fuels, as traditional energy sources, are faced with non-renewable consumption. People begin to consider the development and utilization of new energy sources. Energy saving in buildings has become a topic of widespread concern, and phase change energy storage technology has emerged as the times require. By installing thermal storage equipment of phase change energy storage material indoors, or adding phase change energy storage material to walls, doors, windows and floors, the characteristics of heat storage and heat release during phase transformation process are used to effectively reduce indoor temperature fluctuation and improve comfort of buildings. Among them, the application of solid-liquid phase change energy storage materials has been paid more and more attention, and the study of the characteristics of solid-liquid phase change process has become an important direction in the field of building energy conservation. In this paper, the process characteristics and heat transfer mechanism of paraffin phase transition are studied by using the method of experiment and numerical simulation. First, the phase change temperature, latent heat value, thermal conductivity and specific heat capacity of paraffin wax were measured by DSC (differential scanning calorimetry) and Hotdisk technique. On this basis, a solid-liquid phase transition experimental platform was built, the melting process and characteristics of paraffin with porous skeleton were studied experimentally. The phase transition process was observed by CCD camera, focusing on the formation and migration of phase interface. The temperature distribution of micro-thermocouple embedded in the porous skeleton was measured quantitatively and the phase transition characteristics of paraffin under different heating power were studied. The experimental results show that the isotherm of paraffin wax is the most dense at the boundary and the solid-liquid interface during the process of heat storage, and the temperature gradient is large. The temperature decreases gradually along the direction of heat flux, and eventually tends to be consistent with the process of heat storage. The variation trend of temperature along the direction of height is approximately the same, and the temperature increases with the increase of height, and finally becomes stable with the process of heat storage. Increasing heat flux can accelerate the phase change heat transfer process of regenerative materials, but the phase transition response time is not directly proportional to it. The physical properties of heat storage materials will affect the process of phase change heat transfer, and the specific heat capacity will affect the heating rate before liquefaction. The smaller the specific heat capacity is, the greater the heating rate is. The latent heat of phase change affects the heating rate of melting stage. The bigger the latent heat is, the more stable the change of temperature in latent heat stage is. In order to verify the experimental results and obtain some conclusions, such as the distribution of velocity field and the change of liquid phase rate, the mechanism of phase change heat transfer of heat storage materials is further studied. A numerical simulation model is established in this paper. The effects of porous frameworks with different physical properties on heat transfer and flow in thermal storage materials were studied by using two kinds of framework materials, aluminum and nylon. The results show that the thermal conductivity of paraffin wax containing metal aluminum skeleton is good, and the temperature and velocity change is the most uniform. The temperature change of phase change material is more moderate with the addition of metal aluminum skeleton in the cavity, and the thermal conductivity is strengthened by the existence of framework. The natural convection heat transfer is weakened; The streamline distribution of the phase transition process is most dense at the boundary of the cavity and the solid-liquid interface. Because of the low thermal conductivity of nylon material, the solid liquid phase interface of cavity paraffin with nylon pore skeleton presents a ladder shape, the paraffin in single medium presents a smooth curve, and the interface of paraffin phase with metal skeleton is approximately an inclined straight line. The comparison between the simulation results and the experimental results shows that the results are in good agreement with each other.
【學(xué)位授予單位】:山東建筑大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TU59;TU201.5
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