【摘要】：為使建立在太陽(yáng)能中高溫集熱技術(shù)基礎(chǔ)上的太陽(yáng)能空調(diào)制冷系統(tǒng)全天運(yùn)行，本研究設(shè)計(jì)出一種全新的使用顆粒定形相變儲(chǔ)熱材料的熱管式中溫相變儲(chǔ)熱器。在設(shè)計(jì)的儲(chǔ)熱器的“相變”概念中，并非指儲(chǔ)熱器內(nèi)部相變材料以固液相變方式儲(chǔ)放熱，而是特指儲(chǔ)熱材料與熱源/冷源間以換熱工質(zhì)——水汽液相變的方式換熱。該換熱工質(zhì)以?xún)上嗔鞯姆绞街苯釉谟深w粒相變儲(chǔ)熱材料組成的多孔質(zhì)填充層間流動(dòng)。這種類(lèi)似于并優(yōu)于熱管中間介質(zhì)相變換熱的換熱方式，突破了儲(chǔ)熱材料低導(dǎo)熱系數(shù)帶來(lái)的瓶頸，使得儲(chǔ)熱器的儲(chǔ)放熱性能極其出色。在研究中，首先研制開(kāi)發(fā)了可以批量生產(chǎn)的顆粒定形相變材料，并進(jìn)一步測(cè)量了材料的潛熱、空隙率等相關(guān)的物性參數(shù)。在理論分析相變儲(chǔ)熱器加熱時(shí)間、各部分功率分配、顆粒定形相變材料內(nèi)外溫差和流阻的基礎(chǔ)上，對(duì)所設(shè)計(jì)的相變儲(chǔ)熱器的儲(chǔ)放熱特性進(jìn)行了實(shí)驗(yàn)研究。理論分析及實(shí)驗(yàn)結(jié)果表明，相對(duì)于傳統(tǒng)的儲(chǔ)熱器，所設(shè)計(jì)的相變儲(chǔ)熱器儲(chǔ)放熱性能不再受相變材料低導(dǎo)熱系數(shù)的束縛，，顆粒相變材料能夠迅速完成吸熱和放熱，相變材料與換熱介質(zhì)的溫差只有2℃左右，與冷卻介質(zhì)溫差最低只有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

本文編號(hào)：2145872