检索结果-南通市图书馆

Development of surrogate-optimization models for a novel transcritical power cycle integrated with a small modular reactor

引用

Energy and AI 2024年第1期15卷 15-25页

作者： Yili Zhang Jacob Bryan Geordie Richards Hailei Wang Department of Mechanical&Aerospace Engineering Utah State UniversityLoganUT 84322USA

In recent years,various types of surrogate optimization models have been proposed to reduce the computational time and to improve the emulation *** this study,by leveraging an ANN surrogate model developed earlier,a comprehensive and efficient optimization algorithm is conceived for the global optimal design of an integrated regenerative methanol transcritical *** combines a unique converging/diverging classifier model into the surrogate model to form a surrogate-based model,which significantly improves the prediction accuracy of the objective *** binary classifiers are explored and the multi-layer feed-forward(MLF)neural network classifier is *** addition,within the five global optimizers being explored,the basinhopping(BH)and dual-annealing(DA)are *** optimal surrogate-based model and global optimizers are then combined to form a unique surrogate-optimizer *** surrogate-optimizer model is slightly outperformed by the physics-based model in terms of the optimization results,the time consumption of the surrogate-optimizer model during the optimization searching process is 99%less than that of the physicsbased *** the results,the surrogate-optimizer model is slightly outperformed by the physics-based model in terms of the optimization results,where the Levelized Cost of Energy(LCOE)of the Surrogate-DA and Surrogate-BH models are 77.912 and 78.876$/MWh,respectively,compared to the 77.190$/MWh of the Baseline model with fairly close penalties between *** the meantime,the time consumption of the surrogate-optimizer model during the optimization searching process is 99%less than that of the physics-based model.

关键词： Surrogate model Optimization Binary classifier model Global optimizer Thermodynamic model transcritical cycle Small modular reactors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Combination of CO2 transcritical cycle with Desiccant Cooling

A Combination of CO2 Transcritical Cycle with Desiccant Cool...

引用

2009中国控制与决策会议

作者： Jinggang Wang Ligai Kang Jie Liu Zhenjiang Yin Hebei University of Engineering,Guangming South Street 199,Handan city,056038

The use of heat rejected from the gas cooler of the CO transcritical cycle is a very important to improve the performance of the CO refrigeration.A thermal driven cooling technology is applied in the desiccant cooling system. The rejection heat of the gas cooler can supply the thermal energy for regeneration of the *** it is an interesting option to combine the CO refrigeration with desiccant cooling *** paper deals with three main topics:(1) introduces the principle of desiccant cooling and CO refrigeration,(2) presents the combination system scheme and characteristics of each component,(3) analyses the cycle coefficient of performance and *** this paper points out that the system can improve the performance of CO transcritical cycle effectively and can meet the needs of air conditioning all year round.

关键词： CO2 transcritical cycle desiccant cooling combination system cycle coefficient of performance feasibility

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Configuration Consideration for Expander in transcritical Carbon Dioxide Two-Stage Compression cycle

引用

Transactions of Tianjin University 2005年第1期11卷 53-58页

作者：马一太杨俊兰管海清李敏霞 Thermal Energy Research Institute Tianjin University Tianjin 300072 China

To investigate the configuration consideration of expander in transcritical carbon dioxide two-stage compression cycle, the best place in the cycle should be searched for to reinvest the recovery work so as to improve the system efficiency. The expander and the compressor are connected to the same shaft and integrated into one unit, with the latter being driven by the former, thus the transfer loss and leakage loss can be decreased greatly. In these systems, the expander can be either connected with the first stage compressor (shortened as DCDL cycle) or the second stage compressor (shortened as DCDH cycle), but the two configuration ways can get different performances. By setting up theoretical model for two kinds of expander configuration ways in the transcritical carbon dioxide two-stage compression cycle, the first and the second laws of thermodynamics are used to analyze the coefficient of performance, exergy efficiency, inter-stage pressure, discharge temperature and exergy losses of each component for the two cycles. From the model results, the performance of DCDH cycle is better than that of DCDL cycle. The analysis results are indispensable to providing a theoretical basis for practical design and operating.

关键词： carbon dioxide transcritical cycle two-stage compression expander thermodynamic (analysis)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO_2 ejector system

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第2期12卷 146-153页

作者： Xiao-xiao XU Guang-ming CHEN Li-ming TANG Zhi-jiang ZHU Shuang LIU Institute of Refrigeration and Cryogenics State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

This study presents experimental results focused on a performance comparison of a transcritical CO2 ejector system without an internal heat exchanger(IHX) (EJE-S) to a transcritical CO2 ejector system with an IHX(EJE-IHX-S) . The comparison includes the effects of changes in operating conditions such as cooling water flow rate and inlet temperature. Experiments are conducted to assess the influence of the IHX on the heating coefficient of performance(COPr) ,heating capacity,entrainment ratio,pressure lift,and other parameters. The primary flow rate of the EJE-IHX-S is higher than that of the EJE-S. The pressure lift and actual ejector work recovery are reduced when the IHX is added to the transcritical CO2 ejector system. Using a more practical performance calculation,the compression ratio in the EJE-S is reduced by 10.0%-12.1%,while that of EJE-IHX-S is reduced only by 5.6%-6.7% compared to that of a conventional transcritical CO2 system. Experimental results are used to validate the findings that the IHX weakens the contribution of the ejector to the system performance.

关键词： CO2 ejector system transcritical cycle Heating coefficient of performance (COPr)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Experimental study on characteristics of transcritical heat pump water heater using refrigerant HFC125

引用

Journal of Southeast University(English Edition) 2010年第2期26卷 182-186页

作者：王方连之伟范晓伟王凤坤上海交通大学机械与动力工程学院上海200240 中原工学院能源与环境学院郑州450007

To evaluate the performance of heat pumps using refrigerant HFC125,an experimental rig of a DC-inverter heat pump water heater is designed and set up,and the research on the transcritical heat pump water heater is carried out *** is found that there is a top value of the coefficient of performance（COP）when the system runs at 95 Hz of *** relationships between the COP and compressor frequency,condensation pressure,evaporation pressure,condensation water temperature rise,and discharge temperature are discussed and analyzed at 95 *** the COP of the HFC125 transcritical cycle is also compared with that of a R410 subcritical heat pump under the same *** results indicate that there exists an optimum frequency for a better COP,and the system COP shows an increasing tendency with the decrease in condensation pressure and compressor ratio while the evaporation pressure remains invariant,and the COP decreases rapidly when cooling water temperature rises over 47.5 ℃.Compared with the R410A sub-critical cycle,the COP of HFC125 transcritical cycle significantly increases by 12% on average.

关键词： HFC125 transcritical cycle heat pump water heater coefficient of performance(COP)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：