A modified one-dimensional transient hygrothermal model for multilayer wall was proposed using air humidity ratio and temperature as the driving potentials.The solution for the governing equations was obtained numeric...A modified one-dimensional transient hygrothermal model for multilayer wall was proposed using air humidity ratio and temperature as the driving potentials.The solution for the governing equations was obtained numerically by implementing the finite-difference scheme.To evaluate the accuracy of the model,a test system was built up to measure relative humidity and temperature within a porous wall and compare with the prediction of the model.The prediction results have good agreement with the experimental results.For the interface close to indoor side,the maximum deviation of temperature between calculated and test data is 1.87 K,and the average deviation is 0.95 K;the maximum deviation of relative humidity is 11.4%,and the average deviation is 5.7%.For the interface close to outdoor side,the maximum deviation of temperature between prediction and measurement is 1.78 K,and the average deviation is 1.1 K;the maximum deviation of relative humidity is 9.9%,and the average deviation is 4.2%.展开更多
For the interaction relation between geological object and engineering object in some fields related to water conservancy and hydropower, a unified modeling idea was proposed. On the basis of summarizing both advantag...For the interaction relation between geological object and engineering object in some fields related to water conservancy and hydropower, a unified modeling idea was proposed. On the basis of summarizing both advantages and disadvantages of existing modeling methods, an automatic unified modeling method of both engineering and geological objects based on tri-prism(TP) model was presented. Through the lossless correction algorithm of deviated drill holes contained in this method, the real deviated drill holes could be corrected into the equivalent virtual vertical ones. And the correction accuracy fully meets the requirements of unified modeling. With the virtual vertical drilling data, TIN construction of both cover layer and other stratums would be built in order to obtain the 3D geological model. Then, the engineering design data would be introduced into the 3D geological model for achieving unified modeling. For this process, the volume subdividing and restructuring principles were introduced to deal with the spatial relationships between engineering object and geological object. In order to improve the efficiency of unified modeling, the reconstruction of TIN based on constraint information was also applied in this method. At last, the feasibility and validation of the unified modeling method as well as its relevant key algorithms were verified by specific experiments and analysis of results.展开更多
该文针对质子交换膜(proton exchange membrane,PEM)电解槽负荷安全快速响应电力系统频率控制难题,提出考虑氧中氢含量的PEM电解槽非线性频率动态响应控制策略。首先,基于质量守恒方程、能量守恒方程、阴阳极压强方程以及小室U-I方程建...该文针对质子交换膜(proton exchange membrane,PEM)电解槽负荷安全快速响应电力系统频率控制难题,提出考虑氧中氢含量的PEM电解槽非线性频率动态响应控制策略。首先,基于质量守恒方程、能量守恒方程、阴阳极压强方程以及小室U-I方程建立PEM电解槽一维机理动态模型,得到电解槽阳极氧中氢含量的数学解析模型;其次,基于全息目标反馈非线性频率响应控制(nonlinear control with objectiveholographicfeedbacks,NCOHF)理论,提出考虑氧中氢含量的PEM电解槽频率响应策略;最后,利用25%风电渗透率的4机2区仿真系统在负荷阶跃及风电功率波动工况进行频率响应分析,验证该文方法相较于传统下垂、加速下垂和频率变化率控制在频率动态响应方面的优越性。展开更多
基金Project(51078127) supported by the National Natural Science Foundation of ChinaProject(JJ201109091631) supported by the Foundation for Young Scientists of Jiangxi Education Department, China
文摘A modified one-dimensional transient hygrothermal model for multilayer wall was proposed using air humidity ratio and temperature as the driving potentials.The solution for the governing equations was obtained numerically by implementing the finite-difference scheme.To evaluate the accuracy of the model,a test system was built up to measure relative humidity and temperature within a porous wall and compare with the prediction of the model.The prediction results have good agreement with the experimental results.For the interface close to indoor side,the maximum deviation of temperature between calculated and test data is 1.87 K,and the average deviation is 0.95 K;the maximum deviation of relative humidity is 11.4%,and the average deviation is 5.7%.For the interface close to outdoor side,the maximum deviation of temperature between prediction and measurement is 1.78 K,and the average deviation is 1.1 K;the maximum deviation of relative humidity is 9.9%,and the average deviation is 4.2%.
基金Project(BK2012812)supported by the Natural Science Foundation of Jiangsu Province,ChinaProject(51079053)supported by the National Natural Science Foundation of China+2 种基金Project(KYLX_0493)supported by the Scientific Research and Innovation Program for College Graduates of Jiangsu Province,ChinaProject(2014B38814)supported by the Fundamental Research Funds for Central Universities,ChinaProject(2014.1526)supported by the Open Research Fund Program of Key Laboratory of Geological Information of Ministry of Land and Resources,China
文摘For the interaction relation between geological object and engineering object in some fields related to water conservancy and hydropower, a unified modeling idea was proposed. On the basis of summarizing both advantages and disadvantages of existing modeling methods, an automatic unified modeling method of both engineering and geological objects based on tri-prism(TP) model was presented. Through the lossless correction algorithm of deviated drill holes contained in this method, the real deviated drill holes could be corrected into the equivalent virtual vertical ones. And the correction accuracy fully meets the requirements of unified modeling. With the virtual vertical drilling data, TIN construction of both cover layer and other stratums would be built in order to obtain the 3D geological model. Then, the engineering design data would be introduced into the 3D geological model for achieving unified modeling. For this process, the volume subdividing and restructuring principles were introduced to deal with the spatial relationships between engineering object and geological object. In order to improve the efficiency of unified modeling, the reconstruction of TIN based on constraint information was also applied in this method. At last, the feasibility and validation of the unified modeling method as well as its relevant key algorithms were verified by specific experiments and analysis of results.
文摘该文针对质子交换膜(proton exchange membrane,PEM)电解槽负荷安全快速响应电力系统频率控制难题,提出考虑氧中氢含量的PEM电解槽非线性频率动态响应控制策略。首先,基于质量守恒方程、能量守恒方程、阴阳极压强方程以及小室U-I方程建立PEM电解槽一维机理动态模型,得到电解槽阳极氧中氢含量的数学解析模型;其次,基于全息目标反馈非线性频率响应控制(nonlinear control with objectiveholographicfeedbacks,NCOHF)理论,提出考虑氧中氢含量的PEM电解槽频率响应策略;最后,利用25%风电渗透率的4机2区仿真系统在负荷阶跃及风电功率波动工况进行频率响应分析,验证该文方法相较于传统下垂、加速下垂和频率变化率控制在频率动态响应方面的优越性。
