The utilization of prefabricated light modular radiant heating system has demonstrated significant increases in heat transfer efficiency and energy conservation capabilities.Within prefabricated building construction,...The utilization of prefabricated light modular radiant heating system has demonstrated significant increases in heat transfer efficiency and energy conservation capabilities.Within prefabricated building construction,this new heating method presents an opportunity for the development of comprehensive facilities.The parameters for evaluating the effectiveness of such a system are the upper surface layer’s heat flux and temperature.In this paper,thermal resistance analysis calculation based on a simplified model for this unique radiant heating system analysis is presented with the heat transfer mechanism’s evaluation.The results obtained from thermal resistance analysis calculation and numerical simulation indicate that the thermal resistance analysis method is highly accurate with temperature discrepancies ranging from 0.44℃ to−0.44℃ and a heat flux discrepancy of less than 7.54%,which can meet the requirements of practical engineering applications,suggesting a foundation for the prefabricated radiant heating system.展开更多
以第三代核电站热阱复合墙体为研究对象,将阻容模型和有限差分法耦合,构建了包含界面接触热阻的热阱墙体三维非稳态传热模型,并用墙体蓄热实验进行了验证。模拟分析了不同接触热阻对热阱墙体蓄热性能的影响。结果显示,当接触热阻取0.001...以第三代核电站热阱复合墙体为研究对象,将阻容模型和有限差分法耦合,构建了包含界面接触热阻的热阱墙体三维非稳态传热模型,并用墙体蓄热实验进行了验证。模拟分析了不同接触热阻对热阱墙体蓄热性能的影响。结果显示,当接触热阻取0.001 m 2℃/W时,整面墙蓄热量和放热量减少3%左右,当接触热阻增加至0.01 m 2℃/W时,蓄热量和放热量将减少8%左右。对比分析得出,热阱墙体的接触热阻数量级为10-3。因此,建议在对热阱墙体蓄热性能进行有效评估时,对于接触热阻的影响考虑5%的安全附加系数。展开更多
基于简化Bernardi模型的锂离子电池热模型包含内阻R、开路电压Uocv、热容mCH及换热系数k等参数。其中,R与Uocv是电池荷电状态(state of charge,SOC)、电流I和电池温度Tbat的非线性函数,mCH与k是常数。由于上述参数所表征电池特性不同,...基于简化Bernardi模型的锂离子电池热模型包含内阻R、开路电压Uocv、热容mCH及换热系数k等参数。其中,R与Uocv是电池荷电状态(state of charge,SOC)、电流I和电池温度Tbat的非线性函数,mCH与k是常数。由于上述参数所表征电池特性不同,迄今的估计方法往往需要进行多组不同实验以分别激励对应特性,耗时耗力。该文的热模型参数估计方法仅由一组恒电流实验和相应数据处理流程组成。一组多环境温度下的恒电流实验用于在短实验时间内得到足够数据;基于电池机理的实验数据处理流程则解决了参数的非线性特性以及受到的SOC与Tbat耦合变化的影响。与现有方法相比,该方法具有短时间内同时且准确估计出R(SOC,I,Tbat)、Uocv(SOC,Tbat)和常数mCH与k等优点,易于工程实现。实验验证了方法的上述特点。展开更多
基金Project(NB-2020-JG-07)supported by the Research and Engineering Application of Key Technologies for New Building Industrialization Project of China Northwest Architectural Design and Research Institute Co.,Ltd.Project(2023-CXTD-29)supported by the Key Scientific and Technological Innovation Team of Shaanxi Province,ChinaProject supported by the K.C.Wong Education Foundation。
文摘The utilization of prefabricated light modular radiant heating system has demonstrated significant increases in heat transfer efficiency and energy conservation capabilities.Within prefabricated building construction,this new heating method presents an opportunity for the development of comprehensive facilities.The parameters for evaluating the effectiveness of such a system are the upper surface layer’s heat flux and temperature.In this paper,thermal resistance analysis calculation based on a simplified model for this unique radiant heating system analysis is presented with the heat transfer mechanism’s evaluation.The results obtained from thermal resistance analysis calculation and numerical simulation indicate that the thermal resistance analysis method is highly accurate with temperature discrepancies ranging from 0.44℃ to−0.44℃ and a heat flux discrepancy of less than 7.54%,which can meet the requirements of practical engineering applications,suggesting a foundation for the prefabricated radiant heating system.
文摘以第三代核电站热阱复合墙体为研究对象,将阻容模型和有限差分法耦合,构建了包含界面接触热阻的热阱墙体三维非稳态传热模型,并用墙体蓄热实验进行了验证。模拟分析了不同接触热阻对热阱墙体蓄热性能的影响。结果显示,当接触热阻取0.001 m 2℃/W时,整面墙蓄热量和放热量减少3%左右,当接触热阻增加至0.01 m 2℃/W时,蓄热量和放热量将减少8%左右。对比分析得出,热阱墙体的接触热阻数量级为10-3。因此,建议在对热阱墙体蓄热性能进行有效评估时,对于接触热阻的影响考虑5%的安全附加系数。
文摘基于简化Bernardi模型的锂离子电池热模型包含内阻R、开路电压Uocv、热容mCH及换热系数k等参数。其中,R与Uocv是电池荷电状态(state of charge,SOC)、电流I和电池温度Tbat的非线性函数,mCH与k是常数。由于上述参数所表征电池特性不同,迄今的估计方法往往需要进行多组不同实验以分别激励对应特性,耗时耗力。该文的热模型参数估计方法仅由一组恒电流实验和相应数据处理流程组成。一组多环境温度下的恒电流实验用于在短实验时间内得到足够数据;基于电池机理的实验数据处理流程则解决了参数的非线性特性以及受到的SOC与Tbat耦合变化的影响。与现有方法相比,该方法具有短时间内同时且准确估计出R(SOC,I,Tbat)、Uocv(SOC,Tbat)和常数mCH与k等优点,易于工程实现。实验验证了方法的上述特点。
