| 引用本文: | 王未,谢静超,刘加平,崔亚平.复合墙体中相变层相对导热系数计算方法[J].哈尔滨工业大学学报,2017,49(2):116.DOI:10.11918/j.issn.0367-6234.2017.02.019 |
| WANG Wei,XIE Jingchao,LIU Jiaping,CUI Yaping.Method to calculate relative thermal conductivity of PCM layers in composite walls[J].Journal of Harbin Institute of Technology,2017,49(2):116.DOI:10.11918/j.issn.0367-6234.2017.02.019 |
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| 摘要: |
| 目前相变材料已初步进入工程应用阶段, 由于传热过程受比热、导热系数变化及相变作用的影响, 相变材料不能像普通材料一样利用导热系数进行材料比选, 其热工设计指标的选择具有一定的困难.为此，提出相对导热系数作为相变材料比选的热物性指标，并给出相应的计算方法用以指导相变墙体的热工设计.在一定环境条件下与定物性材料导热能力相同的导热系数定义为相变应用周期内相变材料的相对导热系数.根据此方法计算得到中国不同地区复合墙体相变层的相对导热系数, 通过该参数直观地反映出相变材料层全年的动态传热特性, 从而对相变材料在不同地区建筑中的应用效果进行评估.通过将不同相变层的相对导热系数进行对比，得出不同相变材料在建筑中的应用效果差异较大.本文提出的相对导热系数能够为不同环境条件下相变材料的优选进行有效指导.
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| 关键词: 相变层 传热特性 相对导热系数 数值模拟 |
| DOI：10.11918/j.issn.0367-6234.2017.02.019 |
| 分类号:TU111.19 |
| 文献标识码:A |
| 基金项目:国家自然科学基金重大项目(51590912);国家自然科学基金面上项目(51578013);广东省亚热带建筑技术公共实验室项目 |
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| Method to calculate relative thermal conductivity of PCM layers in composite walls |
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WANG Wei,XIE Jingchao,LIU Jiaping,CUI Yaping
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(College of Architecture and Civil Engineering, Beijing University of Technology,Beijing 100124, China)
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| Abstract: |
| Nowadays phase change materials (PCMs) have been used in preliminary practical engineering. However, the selection of the thermal design parameter of PCMs is really difficult on account of the change of specific heat capacity, thermal conductivity in phase change region and the impact of the latent heat. Thermal conductivity can't be used in the selection of PCMs. To provide guidance in thermal design of the wall, relative thermal conductivity (RTC) of the PCM layer was defined and its computing method was given. RTC is a thermal-physical parameter that can represent the same heat transfer capacity of PCMs with that of normal materials in the same conditions. Based on the computing method, RTC of the PCM layer in different areas were calculated, and heat transfer characteristics of PCM layers in the whole year were shown. In addition, PCM layers' utilization effects in different areas of China were analyzed. By comparing different PCM layers' RTC, it was obtained that different layers had different utilization effects. RTC can be used to select the proper PCM used in a certain area.
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| Key words: PCM layer heat transfer characteristics relative thermal conductivity numerical simulation |
