重力热管式中温相变储热器的基础实验研究
发布时间：2018-07-26 11:31
【摘要】：为使建立在太阳能中高温集热技术基础上的太阳能空调制冷系统全天运行，本研究设计出一种全新的使用颗粒定形相变储热材料的热管式中温相变储热器。在设计的储热器的“相变”概念中，并非指储热器内部相变材料以固液相变方式储放热，而是特指储热材料与热源/冷源间以换热工质——水汽液相变的方式换热。该换热工质以两相流的方式直接在由颗粒相变储热材料组成的多孔质填充层间流动。这种类似于并优于热管中间介质相变换热的换热方式，突破了储热材料低导热系数带来的瓶颈，使得储热器的储放热性能极其出色。在研究中，首先研制开发了可以批量生产的颗粒定形相变材料，并进一步测量了材料的潜热、空隙率等相关的物性参数。在理论分析相变储热器加热时间、各部分功率分配、颗粒定形相变材料内外温差和流阻的基础上，对所设计的相变储热器的储放热特性进行了实验研究。理论分析及实验结果表明，相对于传统的储热器，所设计的相变储热器储放热性能不再受相变材料低导热系数的束缚，，颗粒相变材料能够迅速完成吸热和放热，相变材料与换热介质的温差只有2℃左右，与冷却介质温差最低只有6℃左右。
[Abstract]:In order to make the solar air conditioning refrigeration system run all day on the basis of solar energy medium and high temperature heat collection technology, a new type of heat pipe type medium temperature phase change heat storage heater using particle shape phase change storage material is designed in this paper. In the concept of "phase change" of the designed storage heater, it does not mean that the phase change material in the storage heater is stored and released by solid-liquid phase transition, but rather that the heat storage material and the heat source / cold source exchange heat in the form of heat transfer refrigerant-water vapor liquid phase change. The heat transfer fluid flows directly between porous layers composed of granular phase change heat storage materials in a two-phase flow manner. This kind of heat transfer method is similar to and superior to that of heat pipe intermediate medium phase change heat transfer. It breaks through the bottleneck caused by the low thermal conductivity of heat storage material and makes the heat storage and discharge performance of the heat storage heater extremely excellent. In the research, the particle shape setting phase change material which can be produced in batch is developed, and the physical properties of the material such as latent heat, porosity and so on are further measured. Based on the theoretical analysis of the heating time, the power distribution of each part, the temperature difference and the flow resistance inside and outside of the particle shaped phase change material, the heat storage and exothermic characteristics of the designed phase change storage heater are studied experimentally. The theoretical analysis and experimental results show that compared with the traditional heat storage heater, the heat storage performance of the designed phase change storage heater is no longer bound by the low thermal conductivity of the phase change material, and the particle phase change material can rapidly complete the endothermic and exothermic properties. The temperature difference between the phase change material and the heat transfer medium is only about 2 鈩
本文编号：2145872
[Abstract]:In order to make the solar air conditioning refrigeration system run all day on the basis of solar energy medium and high temperature heat collection technology, a new type of heat pipe type medium temperature phase change heat storage heater using particle shape phase change storage material is designed in this paper. In the concept of "phase change" of the designed storage heater, it does not mean that the phase change material in the storage heater is stored and released by solid-liquid phase transition, but rather that the heat storage material and the heat source / cold source exchange heat in the form of heat transfer refrigerant-water vapor liquid phase change. The heat transfer fluid flows directly between porous layers composed of granular phase change heat storage materials in a two-phase flow manner. This kind of heat transfer method is similar to and superior to that of heat pipe intermediate medium phase change heat transfer. It breaks through the bottleneck caused by the low thermal conductivity of heat storage material and makes the heat storage and discharge performance of the heat storage heater extremely excellent. In the research, the particle shape setting phase change material which can be produced in batch is developed, and the physical properties of the material such as latent heat, porosity and so on are further measured. Based on the theoretical analysis of the heating time, the power distribution of each part, the temperature difference and the flow resistance inside and outside of the particle shaped phase change material, the heat storage and exothermic characteristics of the designed phase change storage heater are studied experimentally. The theoretical analysis and experimental results show that compared with the traditional heat storage heater, the heat storage performance of the designed phase change storage heater is no longer bound by the low thermal conductivity of the phase change material, and the particle phase change material can rapidly complete the endothermic and exothermic properties. The temperature difference between the phase change material and the heat transfer medium is only about 2 鈩
本文编号：2145872
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