摘要
辐射地板供暖具有热源温度低、室内温差小的优点,针对其间歇供暖特性,学者们已展开大量研究,但仍缺少对其热量供给及品位损耗的综合分析。因此,本文提出了基于"热源-末端-室内-室外"传热过程的动态[火积]分析方法,细化分析辐射地板供暖系统不同运行阶段的[火积]耗散,并探究各类型[火积]耗散动态变化特征。研究表明,辐射地板在不同阶段[火积]耗散差异明显,并具有热惯性大、传热热阻高的特点:运行初期,"热源-地板表面"传热过程损耗约占总[火积]耗散56.3%,且在稳定运行时仍为主要部分(45.7%)。随着运行时长增加,"室内-室外"累积[火积]耗散占比可提升13.5%,说明辐射地板适用于长运行周期工况。动态[火积]分析方法可从间歇性、供热量和能量品位损耗三方面综合评价末端供暖能力,为其节能潜力评估和运行策略优化提供指导。
This paper proposed a dynamic entransy analysis method based on the heat transfer process of the whole system of"heat source-heating terminal-indoor-outdoor",and analyzed the characteristics of entransy dissipation of radiant floor through experiment data.According to the study,the entransy dissipation of radiant floor system at different stages show great differences,and is characterized by large thermal inertia and high heat transfer thermal resistance.At the early stage of operation,the loss of heat transfer process"heat source-floor surface"accounts for56.3%of the entransy dissipation,and it remains the major part(45.7%)during stable operation.With the increase of operation time,the cumulative entransy dissipation ratio of"indoor-outdoor"can be increased by13.5%,which indicates that radiant floor is suitable for long operation cycle conditions.The dynamic entransy analysis method can comprehensively evaluate the terminal heating capacity in terms of intermittency,heat supply and energy grade loss,and provide guidance for energy-saving potential assessment and operation strategy optimization.
作者
段梦凡
孙弘历
刘晓华
吴一凡
林波荣
DUAN Mengfan;SUN Hongli;LIU Xiaohua;WU Yifan;LIN Borong(School of Architecture,Tsinghua University,Beijing 100084,China;Key Laboratory of Eco-Planning&Green Building(Tsinghua University),Ministry of Education,Beijing 100084,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China)
出处
《建筑科学》
CSCD
北大核心
2021年第10期49-58,共10页
Building Science
基金
国家重点研发计划项目“基于全生命周期碳减排的建筑运行能效和健康性能提升研究”(2018YFE0106100)
国家自然科学基金国家杰出青年基金“绿色建筑环境营造与节能”(51825802)。
关键词
辐射地板
动态[火积]分析
间歇运行
[火积]耗散
供暖性能
radiant floor
dynamic entransy analysis
intermittent operation
entransy dissipation
heating performance
