The Experts below are selected from a list of 946311 Experts worldwide ranked by ideXlab platform
Donggen Peng - One of the best experts on this subject based on the ideXlab platform.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
Changxing Zhang - One of the best experts on this subject based on the ideXlab platform.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
Ping Chen - One of the best experts on this subject based on the ideXlab platform.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
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an improved Evaluation Method for thermal performance of borehole heat exchanger
Renewable Energy, 2015Co-Authors: Changxing Zhang, Ping Chen, Donggen PengAbstract:Thermal performance of vertical U-pipe borehole heat exchanger (BHE) is an important research subject for the design and application of ground-coupled heat pump system (GCHPs). This paper presents an improved Evaluation Method for thermal performance of BHE based on analytical solution model, which is validated by comparing with duct storage system (DST) model and field experiment. Using the Evaluation Method, impacts of inlet fluid temperature, fluid flow rate and borehole depth on thermal performance of two types of U-pipe BHEs are studied. The study provides a good alternative of the experimental Method for thermal performance test (TPT) and a useful thermal performance Evaluation tool for BHEs in GCHPs.
Tetsuya Nagasaka - One of the best experts on this subject based on the ideXlab platform.
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Evaluation Method of metal resource recyclability based on thermodynamic analysis
2016Co-Authors: Kenichi Nakajima, Osamu Takeda, Takahiro Miki, Tetsuya NagasakaAbstract:Currently, several metals are commercially recycled from by-products and wastes by metallurgical processing. However, the metallurgical process has each characteristic, which causes limitation for resource recovery. The combinations of elements in secondary resources, such as by-products and wastes, are often different from those in natural resources. There are even combinations that are not present in natural resources. Conventional metallurgical processes have been optimized for economical and efficient extraction of desired elements only from large amount of ores under constant grade. Therefore, in order to extract metals from secondary resources by the conventional metallurgical process, it is necessary to estimate the recoverability of the constituent elements by taking into account their chemical properties well in advance. In particular, analysis for combination of elements is significantly important. In this study, we developed the Evaluation Method of metal resources recyclability based on thermodynamic analysis, and made clear the element distribution among gas, slag and metal phases during metal recovery based on thermodynamic analysis. In an application of the Method shows that Cu, and precious metals (Ag, Au, Pt, Pd) present in mobile phones can be recovered as metals in the pyrometallurgy process of Cu in a converter, while Pb and Zn can be recovered as vapor. Other elements distributed in the slag phase are difficult to recover. The result of our analysis reflects the trends observed in the distribution of metals in copper metallurgy, thereby indicating the validity of our proposed Evaluation Method. [doi:10.2320/matertrans.MBW200806
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Evaluation Method of metal resource recyclability based on thermodynamic analysis
Materials Transactions, 2009Co-Authors: Kenichi Nakajima, Osamu Takeda, Takahiro Miki, Tetsuya NagasakaAbstract:Currently, several metals are commercially recycled from by-products and wastes by metallurgical processing. However, the metallurgical process has each characteristic, which causes limitation for resource recovery. The combinations of elements in secondary resources, such as by-products and wastes, are often different from those in natural resources. There are even combinations that are not present in natural resources. Conventional metallurgical processes have been optimized for economical and efficient extraction of desired elements only from large amount of ores under constant grade. Therefore, in order to extract metals from secondary resources by the conventional metallurgical process, it is necessary to estimate the recoverability of the constituent elements by taking into account their chemical properties well in advance. In particular, analysis for combination of elements is significantly important. In this study, we developed the Evaluation Method of metal resources recyclability based on thermodynamic analysis, and made clear the element distribution among gas, slag and metal phases during metal recovery based on thermodynamic analysis. In an application of the Method shows that Cu, and precious metals (Ag, Au, Pt, Pd) present in mobile phones can be recovered as metals in the pyrometallurgy process of Cu in a converter, while Pb and Zn can be recovered as vapor. Other elements distributed in the slag phase are difficult to recover. The result of our analysis reflects the trends observed in the distribution of metals in copper metallurgy, thereby indicating the validity of our proposed Evaluation Method.
Seetaramaraju Jampana - One of the best experts on this subject based on the ideXlab platform.
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an entropy based Evaluation Method for knowledge bases of medical information systems
Expert Systems With Applications, 2016Co-Authors: Christian F Hempelmann, Unal Sakoglu, Varadraj P Gurupur, Seetaramaraju JampanaAbstract:Development of an entropy-based Evaluation Method to evaluate ontology strength.Evaluation an ontological semantic ontology using the Evaluation Method.Evaluation of the backbone of the UMLS with this Method. In this paper we introduce a Method to develop knowledge bases for medical decision support systems, with a focus on evaluating such knowledge bases. Departing from earlier efforts with concept maps, we developed an ontological-semantic knowledge base and evaluated its information content using the metrics we have developed, and then compared the results to the UMLS backbone knowledge base. The Evaluation Method developed uses information entropy of concepts, but in contrast to previous approaches normalizes it against the number of relations to evaluate the information density of knowledge bases of varying sizes. A detailed description of the knowledge base development and Evaluation is discussed using the underlying algorithms, and the results of experimentation of the Methods are explained. The main Evaluation results show that the normalized metric provides a balanced Method for assessment and that our knowledge base is strong, despite having fewer relationships, is more information-dense, and hence more useful. The key contributions in the area of developing expert systems detailed in this paper include: (a) introduction of a normalized entropy-based Evaluation technique to evaluate knowledge bases using graph theory, (b) results of the experimentation of the use of this technique on existing knowledge bases.
