本文選題：高溫供冷 + 相變蓄冷��； 參考：《上海交通大學》2014年碩士論文

【摘要】：在我國能源短缺，電力緊張的情況下，蓄冷空調技術在空調系統(tǒng)中的應用可以起到平衡電網(wǎng)負荷的作用。而目前常見的相變蓄冷換熱裝置的換熱性能普遍不佳，影響了該技術的應用推廣。因此，如何有效的強化相變蓄冷換熱裝置的換熱過程是目前研究的熱點。本文設計了一種新型高效相變蓄冷換熱管，對其換熱性能進行了實驗研究。在此基礎上建立了數(shù)學模型，從結構參數(shù)及運行參數(shù)兩方面進行了理論分析及性能預測。主要研究工作如下： （1）結合當前國內外學者的研究成果，對常見的相變蓄冷材料及相變蓄冷換熱裝置進行了總結與概括。通過橫向對比與分析，選擇管肋式換熱管，結合有機復合相變蓄冷材料進行研究，以提高相變蓄冷系統(tǒng)的換熱性能。 （2）以油酸、癸酸、月桂酸為基液配置了有機復合相變材料，并通過添加適量納米粒子改善了材料的傳熱特性�；诖瞬牧涎兄屏烁咝Ч芾呤较嘧冃罾鋼Q熱管。在典型高溫供冷運行工況下，對相變蓄冷換熱管蓄冷、釋冷兩個過程進行了實驗研究。實驗結果表明，該管肋式相變蓄冷換熱管的蓄冷量及釋冷量分別為470KJ及450KJ，平均蓄冷功率為112.7W，平均釋冷功率為106.8W。相比于目前常用的封裝球相變蓄冷器，該新型管肋式相變蓄冷換熱管的換熱速率可以提高近40%。 （3）采用焓-多孔度法建立該管肋式相變蓄冷換熱管的數(shù)學模型。通過有限元分析軟件Fluent，在第二類邊界條件下使用凝固/融化模型進行求解，研究相變材料的溫度變化及相界面移動過程。數(shù)值模擬結果與實驗相對比，蓄冷過程相對誤差為8.3%，釋冷過程相對誤差9.7%，數(shù)值模擬結果與實驗測試結果吻合度較好 （4）研究了相變蓄冷換熱管的結構參數(shù)以及載熱流體運行參數(shù)對管肋式相變蓄冷換熱管性能的影響。通過數(shù)值計算研究了直肋、環(huán)肋的強化換熱效果；分析表明，當環(huán)形肋片間距為40mm，，直肋片密度為9，肋片厚度為1.5mm，直肋寬度為37.5mm時該管肋式相變蓄冷換熱管的換熱速率最高。相比于實驗結果，采用優(yōu)化結構參數(shù)的相變蓄冷換熱管可以提高換熱速率30.5%。通過計算在不同載熱流體溫度及載熱流體流量的情況下相變蓄冷換熱器換熱速率，研究了載熱流體運行參數(shù)對相變蓄冷換熱管性能的影響。 （5）以該相變蓄冷換熱管為換熱單元，可以通過并聯(lián)組合成不同蓄冷量的相變蓄冷換熱器。在提高相變蓄冷系統(tǒng)的換熱性能的同時，可以靈活的適應不同制冷量的要求。
[Abstract]:In the situation of energy shortage and power shortage in China, the application of cold storage air conditioning technology in air conditioning system can balance the load of power grid. At present, the heat transfer performance of phase change storage heat exchanger is generally poor, which affects the application of this technology. Therefore, how to effectively enhance the heat transfer process of phase change storage heat exchanger is a hot topic at present. In this paper, a new type of high efficiency phase change heat storage tube is designed and its heat transfer performance is studied experimentally. On this basis, the mathematical model is established, and the theoretical analysis and performance prediction are carried out from two aspects: structure parameters and operation parameters. The main research work is as follows: 1) combined with the current research results of domestic and foreign scholars, the common phase change storage materials and phase change heat exchanger are summarized and summarized. In order to improve the heat transfer performance of the phase change storage system, the tube rib heat transfer tube was selected and the organic composite phase change storage material was used to improve the heat transfer performance of the phase change storage system through transverse comparison and analysis. (2) oleic acid, sebacic acid, Lauric acid was used as the base solution of organic composite phase change material, and the heat transfer property of the material was improved by adding proper amount of nanoparticles. Based on this material, the high-efficiency tube rib phase-change heat transfer tube was developed. In the typical high temperature cooling operation condition, the two processes of phase change heat storage tube storage and cold release are studied experimentally. The experimental results show that the cold storage capacity and release rate of the ribbed phase change heat storage tube are 470KJ and 450 KJ respectively, the average storage power is 112.7W and the average cool-releasing power is 106.8W. Compared with the encapsulated spherical phase change accumulator, the heat transfer rate of the new tube rib type phase change storage tube can be increased by nearly 40%. 3) the mathematical model of the tube rib type phase change heat storage tube is established by using enthalpy-porosity method. By using the finite element analysis software Fluent. the solidification / melting model is used to study the temperature change and phase interface movement of the phase change material under the second boundary condition. The numerical simulation results are compared with the experimental results. The relative error of the cold storage process is 8. 3 and the relative error of the release process is 9. 7. The numerical simulation results are in good agreement with the experimental results. (4) the structural parameters of the phase change heat storage tube and the operation parameters of the heat carrying fluid are studied. Effect of ribbed phase change storage tube on performance. The heat transfer effect of straight rib and ring rib is studied by numerical calculation, and the results show that the heat transfer rate of the tube is the highest when the space of ring rib is 40mm, the density of straight rib is 9, the thickness of rib is 1.5mm, and the width of straight rib is 37.5mm. Compared with the experimental results, the phase change heat transfer tube with optimized structure parameters can increase the heat transfer rate by 30.5%. The heat transfer rate of phase change heat storage heat exchanger is calculated under different temperature and flow rate of heat carrier fluid. The effect of operation parameters of heat carrier fluid on the performance of phase change heat storage tube is studied. Using the phase change heat storage tube as heat exchanger unit, the phase change heat storage heat exchanger with different storage capacity can be formed in parallel. While improving the heat transfer performance of phase change storage system, it can adapt to different refrigerating capacity flexibly.
【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB657.5

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