The Experts below are selected from a list of 196755 Experts worldwide ranked by ideXlab platform
Pengsu Wang - One of the best experts on this subject based on the ideXlab platform.
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study on the second order transfer function models for Dynamic Tests of flat plate solar collectors part ii experimental validation
Solar Energy, 2017Co-Authors: Xudong Yang, Jie Deng, Pengsu WangAbstract:Abstract In order to validate the accuracy levels of three forms of transfer function models (TFMs), Dynamic thermal performance Tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-order differential TFMs have the same accuracy as the reduced first-order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-order differential terms in the TFMs are very small. In order for the second-order TFMs to perform better in the Dynamic Tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-order differential terms of temperatures could be larger than the second-order differential terms of temperatures and the second-order terms in the three forms of TFMs would become meaningless.
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Study on the second-order transfer function models for Dynamic Tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
Solar Energy, 2015Co-Authors: Jie Deng, Xudong Yang, Pengsu WangAbstract:Abstract The existing second-order transfer function models (TFMs) for solar collector Dynamic Tests are reviewed in light of the heat transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in Dynamic Tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).
Jie Deng - One of the best experts on this subject based on the ideXlab platform.
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study on the second order transfer function models for Dynamic Tests of flat plate solar collectors part ii experimental validation
Solar Energy, 2017Co-Authors: Xudong Yang, Jie Deng, Pengsu WangAbstract:Abstract In order to validate the accuracy levels of three forms of transfer function models (TFMs), Dynamic thermal performance Tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-order differential TFMs have the same accuracy as the reduced first-order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-order differential terms in the TFMs are very small. In order for the second-order TFMs to perform better in the Dynamic Tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-order differential terms of temperatures could be larger than the second-order differential terms of temperatures and the second-order terms in the three forms of TFMs would become meaningless.
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Study on the second-order transfer function models for Dynamic Tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
Solar Energy, 2015Co-Authors: Jie Deng, Xudong Yang, Pengsu WangAbstract:Abstract The existing second-order transfer function models (TFMs) for solar collector Dynamic Tests are reviewed in light of the heat transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in Dynamic Tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).
Xudong Yang - One of the best experts on this subject based on the ideXlab platform.
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study on the second order transfer function models for Dynamic Tests of flat plate solar collectors part ii experimental validation
Solar Energy, 2017Co-Authors: Xudong Yang, Jie Deng, Pengsu WangAbstract:Abstract In order to validate the accuracy levels of three forms of transfer function models (TFMs), Dynamic thermal performance Tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-order differential TFMs have the same accuracy as the reduced first-order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-order differential terms in the TFMs are very small. In order for the second-order TFMs to perform better in the Dynamic Tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-order differential terms of temperatures could be larger than the second-order differential terms of temperatures and the second-order terms in the three forms of TFMs would become meaningless.
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Study on the second-order transfer function models for Dynamic Tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
Solar Energy, 2015Co-Authors: Jie Deng, Xudong Yang, Pengsu WangAbstract:Abstract The existing second-order transfer function models (TFMs) for solar collector Dynamic Tests are reviewed in light of the heat transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in Dynamic Tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).
Chui Hsin Chen - One of the best experts on this subject based on the ideXlab platform.
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INTERNATIONAL COLLABORATION ON PSUEDO-Dynamic Tests OF A FULL SCALE BRB COMPOSITE FRAME
2014Co-Authors: Keh-chyuan Tsai, Po Chien Hsiao, Yuan Tao Weng, Min Lang Lin, Jiun-wei Lai, Chui Hsin ChenAbstract:This paper introduces a full-scale 3-story 3-bay composite structure, using concrete filled steel tube (CFT) columns in a buckling restrained braced (CFT/BRB) frame, tested recently in the Taiwan National Center for Research on Earthquake Engineering (NCREE). The specimen was tested using pseudo Dynamic test procedures and internet testing techniques. The test frame was loaded to simulate the responses under ground motions corresponding to earthquake hazards for a highly seismic location with 50%, 10%, and 2 % chance of exceedance in 50 years in both Taiwan and United States. The frame specimen was designed by displacement-based seismic design (DSD) procedures considering a target inter-story drift limit of 0.025 radian for the 2 % in 50 years hazard level. This paper summarizes the analytical studies made before and after the Tests and evaluates the key structural performance. CFT/BRBF performed extremely well after the application of six earthquake load effects. Very minor changes on stiffness and damping were observed as evidenced from the free vibration Tests conducted after each earthquake pseudo Dynamic test. The peak story drift reached 0.023 radian at the first story after applying the 2/50 design earthquake on the specimen. Tests confirmed that the DSD procedure adopted in the design of the specimen is effective in limiting the ultimate story drift. Tests also confirmed that the response of the CFT/BRB frame can be satisfactorily predicted by using either OpenSees or PISA3D
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pseudo Dynamic Tests of a full scale cft brb frame part i specimen design experiment and analysis
Earthquake Engineering & Structural Dynamics, 2008Co-Authors: Po Chien Hsiao, Kung Juin Wang, Yuan Tao Weng, Min Lang Lin, Ker Chun Lin, Chui Hsin Chen, Keh-chyuan TsaiAbstract:A series of pseudo-Dynamic Tests (PDTs) of a full-scale 3-story 3-bay buckling-restrained braced frame (BRBF) using concrete-filled tube columns was tested in the Taiwan National Center for Research on Earthquake Engineering using networked PDT techniques in October 2003. During the Tests, real-time experimental responses and video were webcasted to Internet viewers. The input ground motions adopted for the PDTs were chosen from the 1999 Chi-Chi and the 1989 Loma Prieta earthquakes and scaled to represent three seismic hazard levels. This paper is in two parts, focusing on the investigations of the overall structure and the local members. This paper constitutes Part I and discusses the design, analytical investigations, and key experimental results of the specimen frame, such as the buckling of the brace-to-gusset joints. Part II of the paper, the companion paper, describes the gusset stiffening schemes and detailed experimental behavior of the BRBs and their connections. Experimental peak inter-story drifts of 0.019 and 0.023 radians, prescribed for the design basis and the maximum credible earthquakes, respectively, are within the target design limits of 0.020 and 0.025 radians. These Tests confirmed that the PISA3D and OpenSees nonlinear structural analysis computer programs can simulate the experimental peak shears and floor displacements well. Copyright © 2008 John Wiley & Sons, Ltd.
Keh-chyuan Tsai - One of the best experts on this subject based on the ideXlab platform.
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INTERNATIONAL COLLABORATION ON PSUEDO-Dynamic Tests OF A FULL SCALE BRB COMPOSITE FRAME
2014Co-Authors: Keh-chyuan Tsai, Po Chien Hsiao, Yuan Tao Weng, Min Lang Lin, Jiun-wei Lai, Chui Hsin ChenAbstract:This paper introduces a full-scale 3-story 3-bay composite structure, using concrete filled steel tube (CFT) columns in a buckling restrained braced (CFT/BRB) frame, tested recently in the Taiwan National Center for Research on Earthquake Engineering (NCREE). The specimen was tested using pseudo Dynamic test procedures and internet testing techniques. The test frame was loaded to simulate the responses under ground motions corresponding to earthquake hazards for a highly seismic location with 50%, 10%, and 2 % chance of exceedance in 50 years in both Taiwan and United States. The frame specimen was designed by displacement-based seismic design (DSD) procedures considering a target inter-story drift limit of 0.025 radian for the 2 % in 50 years hazard level. This paper summarizes the analytical studies made before and after the Tests and evaluates the key structural performance. CFT/BRBF performed extremely well after the application of six earthquake load effects. Very minor changes on stiffness and damping were observed as evidenced from the free vibration Tests conducted after each earthquake pseudo Dynamic test. The peak story drift reached 0.023 radian at the first story after applying the 2/50 design earthquake on the specimen. Tests confirmed that the DSD procedure adopted in the design of the specimen is effective in limiting the ultimate story drift. Tests also confirmed that the response of the CFT/BRB frame can be satisfactorily predicted by using either OpenSees or PISA3D
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pseudo Dynamic Tests of a full scale cft brb frame part i specimen design experiment and analysis
Earthquake Engineering & Structural Dynamics, 2008Co-Authors: Po Chien Hsiao, Kung Juin Wang, Yuan Tao Weng, Min Lang Lin, Ker Chun Lin, Chui Hsin Chen, Keh-chyuan TsaiAbstract:A series of pseudo-Dynamic Tests (PDTs) of a full-scale 3-story 3-bay buckling-restrained braced frame (BRBF) using concrete-filled tube columns was tested in the Taiwan National Center for Research on Earthquake Engineering using networked PDT techniques in October 2003. During the Tests, real-time experimental responses and video were webcasted to Internet viewers. The input ground motions adopted for the PDTs were chosen from the 1999 Chi-Chi and the 1989 Loma Prieta earthquakes and scaled to represent three seismic hazard levels. This paper is in two parts, focusing on the investigations of the overall structure and the local members. This paper constitutes Part I and discusses the design, analytical investigations, and key experimental results of the specimen frame, such as the buckling of the brace-to-gusset joints. Part II of the paper, the companion paper, describes the gusset stiffening schemes and detailed experimental behavior of the BRBs and their connections. Experimental peak inter-story drifts of 0.019 and 0.023 radians, prescribed for the design basis and the maximum credible earthquakes, respectively, are within the target design limits of 0.020 and 0.025 radians. These Tests confirmed that the PISA3D and OpenSees nonlinear structural analysis computer programs can simulate the experimental peak shears and floor displacements well. Copyright © 2008 John Wiley & Sons, Ltd.
