基于相變材料的電加熱地板輻射采暖系統(tǒng)實驗及模擬研究
發(fā)布時間：2018-08-26 16:24
【摘要】：相變材料在建筑節(jié)能方面的應用已成為建筑材料應用領域的重大課題。將相變材料應用于地板輻射采暖系統(tǒng)，是降低建筑采暖能耗和成本的創(chuàng)新途徑。與傳統(tǒng)的熱水地板輻射采暖方式相比，電加熱地板輻射采暖方式具有空間占用率低、前期投入較低、取暖快捷、溫度控制靈活以及系統(tǒng)維護簡單等優(yōu)點，逐漸成為未來建筑供暖的發(fā)展方向。但是電是高品位能源，，電能轉化為熱能無論是從能源利用效率還是經濟性兩方面來評估都是不劃算的。因此，純電加熱地板輻射采暖方式并未得到廣泛的推廣使用。然而，相變材料的應用完全可以解決這一矛盾，利用相變材料在夜間將“谷電”轉化的熱能儲存起來供于建筑的采暖，以實現(xiàn)電力“削峰填谷”，達到經濟節(jié)能和清潔取暖的目標。這將在更大程度的范圍內實現(xiàn)節(jié)約電力能源，大范圍推廣清潔取暖這一目標。 本文以我國南方氣候的實驗條件為基礎，建立基于相變材料的電加熱地板輻射采暖系統(tǒng)的模擬試驗房，并對試驗房的傳熱過程進行合理簡化，提出了模擬試驗房采暖過程的二維非穩(wěn)態(tài)傳熱模型，采用Fluent軟件對該過程進行模擬計算。通過實驗研究與數(shù)值模擬相結合的方式，研究了不同相變材料物性參數(shù)及操作條件對電加熱地板輻射采暖系統(tǒng)的性能影響及規(guī)律。 研究結果表明：與無相變材料層的電加熱地板輻射采暖系統(tǒng)相比，具有相變材料層的電加熱地板輻射采暖系統(tǒng)不僅可以延長電熱膜壽命，并且還可以實現(xiàn)建筑供暖熱舒適及經濟節(jié)能效果。實驗通過比較加熱時間為10000s和11800s時系統(tǒng)的采暖效果，得到加熱時間為11800時峰值溫度較高且供暖時間較長；比較加熱功率為200W和220W時系統(tǒng)的采暖效果，得到加熱功率越大升溫速率越大、峰值溫度越高、供暖時間越長且達到峰值溫度所需的時間并不受加熱功率的影響。在數(shù)值模擬研究中，通過研究不同相變材料的相變溫度及相變溫度區(qū)間、相變潛熱值、相變材料的厚度、加熱功率、環(huán)境溫度及圍護結構傳熱系數(shù)等因素對地板輻射采暖系統(tǒng)的影響，得出加熱功率的數(shù)值模擬結果與實驗結果基本一致的結論。
[Abstract]:The application of phase change materials in building energy conservation has become an important subject in the field of building materials application. The application of phase change material in floor radiant heating system is an innovative way to reduce energy consumption and cost of building heating. Compared with the traditional hot water floor radiation heating mode, the electric heating floor radiation heating mode has the advantages of low space occupancy, low early investment, quick heating, flexible temperature control and simple system maintenance. Gradually become the future direction of building heating development. However, electricity is a high grade energy, and it is not cost-effective to convert it into heat energy in terms of energy efficiency and economy. Therefore, pure electric heating floor radiation heating method has not been widely used. However, the application of phase change materials can completely solve this contradiction. The thermal energy converted from "valley electricity" can be stored by phase change materials at night for building heating, so as to realize "cutting peak and filling valley" of electric power. To achieve the goal of economic energy saving and clean heating. This will achieve the goal of saving electricity and promoting clean heating to a greater extent. In this paper, based on the experimental conditions of climate in southern China, the simulated test room of electric heating floor radiant heating system based on phase change material is established, and the heat transfer process of the test room is reasonably simplified. A two-dimensional unsteady heat transfer model is proposed to simulate the heating process in a test room. Fluent software is used to simulate the process. Through the combination of experimental research and numerical simulation, the effects of physical parameters and operating conditions of different phase change materials on the performance of radiant heating system with electric heating floor are studied. The results show that compared with the radiant heating system without phase change material layer, the radiant heating system with phase change material layer can not only prolong the life of electric heating film. And also can realize the building heating thermal comfort and economic energy-saving effect. By comparing the heating effect of the system with heating time of 1000 s and 11800 s, the results show that the heating time is 11800, the peak temperature is higher and the heating time is longer, and the heating effect is compared when the heating power is 200W and 220W, respectively. The larger the heating power, the higher the heating rate, the higher the peak temperature, the longer the heating time and the time needed to reach the peak temperature is not affected by heating power. In the numerical simulation, the phase change temperature and temperature range, the latent heat value, the thickness of phase change material, the heating power of phase change material are studied. The influence of environmental temperature and heat transfer coefficient of enclosure on the floor radiation heating system is discussed. The numerical simulation results of heating power are in good agreement with the experimental results.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU832.16
本文編號：2205477
[Abstract]:The application of phase change materials in building energy conservation has become an important subject in the field of building materials application. The application of phase change material in floor radiant heating system is an innovative way to reduce energy consumption and cost of building heating. Compared with the traditional hot water floor radiation heating mode, the electric heating floor radiation heating mode has the advantages of low space occupancy, low early investment, quick heating, flexible temperature control and simple system maintenance. Gradually become the future direction of building heating development. However, electricity is a high grade energy, and it is not cost-effective to convert it into heat energy in terms of energy efficiency and economy. Therefore, pure electric heating floor radiation heating method has not been widely used. However, the application of phase change materials can completely solve this contradiction. The thermal energy converted from "valley electricity" can be stored by phase change materials at night for building heating, so as to realize "cutting peak and filling valley" of electric power. To achieve the goal of economic energy saving and clean heating. This will achieve the goal of saving electricity and promoting clean heating to a greater extent. In this paper, based on the experimental conditions of climate in southern China, the simulated test room of electric heating floor radiant heating system based on phase change material is established, and the heat transfer process of the test room is reasonably simplified. A two-dimensional unsteady heat transfer model is proposed to simulate the heating process in a test room. Fluent software is used to simulate the process. Through the combination of experimental research and numerical simulation, the effects of physical parameters and operating conditions of different phase change materials on the performance of radiant heating system with electric heating floor are studied. The results show that compared with the radiant heating system without phase change material layer, the radiant heating system with phase change material layer can not only prolong the life of electric heating film. And also can realize the building heating thermal comfort and economic energy-saving effect. By comparing the heating effect of the system with heating time of 1000 s and 11800 s, the results show that the heating time is 11800, the peak temperature is higher and the heating time is longer, and the heating effect is compared when the heating power is 200W and 220W, respectively. The larger the heating power, the higher the heating rate, the higher the peak temperature, the longer the heating time and the time needed to reach the peak temperature is not affected by heating power. In the numerical simulation, the phase change temperature and temperature range, the latent heat value, the thickness of phase change material, the heating power of phase change material are studied. The influence of environmental temperature and heat transfer coefficient of enclosure on the floor radiation heating system is discussed. The numerical simulation results of heating power are in good agreement with the experimental results.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU832.16
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