化工进展 ›› 2022, Vol. 41 ›› Issue (1): 104-112.DOI: 10.16085/j.issn.1000-6613.2021-0275

• 化工过程与装备 • 上一篇    下一篇

不同气候条件下相变屋顶传热性能数值分析

倪金鹏1(), 罗祝清1, 屈治国2, 徐洪涛1()   

  1. 1.上海理工大学能源与动力工程学院,上海 200093
    2.西安交通大学热流科学与工程教育部重点实验室,陕西 西安 710049
  • 收稿日期:2021-02-05 修回日期:2021-04-08 出版日期:2022-01-05 发布日期:2022-01-24
  • 通讯作者: 徐洪涛
  • 作者简介:倪金鹏(1996—),男,硕士研究生,研究方向为工程热物理。E-mail:1014078114@qq.com
  • 基金资助:
    国家重点研发计划(2018YFF0216000);上海市国际科技合作基金(18160743600);上海市自然科学基金(20ZR1438700)

Numerical analysis on heat transfer performance of phase change roofs under different climates

NI Jinpeng1(), LUO Zhuqing1, QU Zhiguo2, XU Hongtao1()   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
  • Received:2021-02-05 Revised:2021-04-08 Online:2022-01-05 Published:2022-01-24
  • Contact: XU Hongtao

摘要:

相变墙体可以有效降低建筑能耗并提高热舒适性。相变屋顶多孔砖内部填充相变温度为25~33℃的石蜡,引入考虑辐射与空气温度的等效温度,本文利用高性能计算显卡(GPU)加速基于焓法的多松弛时间格子玻尔兹曼算法(MRT-LBM),分析了2020年8月典型天气下中国7个城市应用不同相变温度的石蜡对屋顶热响应特性的影响。采用相变温度为27℃的石蜡进行研究,结果表明,上海地区相变屋顶中的石蜡没有发生相变,空调运行期间由屋顶进入室内单位面积的热量高达324.3kJ/m2;成都地区相变屋顶中的石蜡液化率变化最大为30%,内表面温度在25.6~27.3℃波动,温差仅为1.7℃,由屋顶进入室内单位面积的热量仅为50.9kJ/m2;武汉和北京地区的液相率变化很接近,其相变时间达到全天的50%,对应的由屋顶进入室内单位面积的热量为上海地区的0.37倍;昆明与哈尔滨地区屋顶内表面温度波动分别达到4.5℃与4.4℃,但对应的温度均在28℃以内;广州地区相变屋顶中的石蜡几乎没有发生相变,室内温度波动幅度为成都的2.6倍。北京、成都、武汉和昆明地区适合采用相变温度为27℃的石蜡,而广州、上海和哈尔滨地区适合采用相变温度为29℃、31℃和25℃的石蜡。本文工作可为相变建筑优化设计提供参考。

关键词: 相变材料, 格子-玻尔兹曼方法, 瞬态响应, 传热, 数值模拟

Abstract:

Walls filled with phase change materials (PCM) can effectively reduce building energy consumption and improve thermal comfort. The porous brick roof was filled with paraffin with a phase transition temperature of 25—33℃. The equivalent temperature considering radiation and air temperature was introduced. The GPU accelerated multi-relaxation-time lattice Boltzmann method (MRT-LBM) based on enthalpy method was used to analyze the effects of paraffin wax with different phase change temperatures on the thermal response characteristics of roofs in seven cities of China in August 2020. The results of paraffin with phase change temperature of 27℃ were shown that phase change of paraffin did not occur in the building roof of Shanghai, and the entering heat flux was as high as 324.3kJ/m2. The liquefaction rate of paraffin in the phase change roof of Chengdu area changed by 30%. The internal surface temperature fluctuates between 25.6℃ and 27.3℃, and the temperature difference was only 1.7℃. The entering heat flux was only 50.9kJ/m2. The results indicated that the change of liquid phase rate in Wuhan and Beijing was very close, the phase transition time was 50% of the whole day and the corresponding heat flux entering the room was 0.37 times of that in Shanghai. The temperature fluctuation of the inner surface of the roof wall in Kunming and Harbin reached 4.5℃ and 4.4℃, respectively, but the corresponding temperature was 28℃. The indoor temperature fluctuation of Guangzhou was 2.6 times of that in Chengdu. Beijing, Chengdu, Wuhan and Kunming were suitable for paraffin with phase transition temperature of 27℃, while Guangzhou, Shanghai and Harbin were suitable for paraffin with phase transition temperature of 29℃, 31℃ and 25℃, respectively. This work can provide the guide for the optimization design of phase change building.

Key words: phase change materials, Lattice-Boltzmann method, transient response, heat transfer, numerical simulation

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