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Application modelling of intelligent diagnosis for thermal cycle system 热循环系统智能诊断的应用建模
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302101l
C. Liang
{"title":"Application modelling of intelligent diagnosis for thermal cycle system","authors":"C. Liang","doi":"10.2298/tsci2302101l","DOIUrl":"https://doi.org/10.2298/tsci2302101l","url":null,"abstract":"In order to solve the problem of intelligent fault diagnosis of thermal system of thermal power unit, the application modelling of intelligent diagnosis of thermal cycle system is proposed. This paper first filters the influence of the change of valve opening of steam turbine on the performance index under the condition of constant power, and qualitatively analyzes the actual change of the performance index compared with the reference working condition when the component fails, so as to eliminate the mutual influence between the components. Then, the selection principle of thermodynamic parameters is determined, the irreversible loss in the structural theory of thermal economics is introduced as the performance index, and the model is used to quantitatively calculate the change of performance index of each component under fault conditions to diagnose the failed component. Finally, APROS simulation software is used to simulate various fault conditions of 330 MW units in a power plant. The experimental results show that the recognition accuracy of the monitoring system designed in this paper can reach 98.33%. In conclusion, the method in this paper proves the feasibility of intelligent fault diag?nosis of thermodynamic system network.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68259271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Signal processing and thermal performance analysis of motor heat recovery system 电机热回收系统的信号处理及热性能分析
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302125l
Jinwen Li
{"title":"Signal processing and thermal performance analysis of motor heat recovery system","authors":"Jinwen Li","doi":"10.2298/tsci2302125l","DOIUrl":"https://doi.org/10.2298/tsci2302125l","url":null,"abstract":"In order to realize the condition monitoring of the motor ?anytime, anywhere?, improve the detection accuracy and shorten the detection time, the author proposes a fault signal processing and diagnosis system for the motor heat recovery system based on the IoT. That is, based on the IoT technology, a mobile terminal oriented motor remote monitoring and fault diagnosis system, the sensing layer of the system collects real-time motor operation status data, and the transmission layer realizes data transmission, cloud storage and response to data requests from the application layer, finally, at the mobile end, the motor running status and diagnosis results are displayed through charts and text, so as to realize remote monitoring and fault diagnosis of the motor. The experimental results show that the accuracy of fault diagnosis test of GA-SVM in mobile terminal is more than 90%, and the running time is less than 30 ms, and the running time is very short. It proves that the mobile terminal uses the fault detection method based on GA-SVM model with high accuracy and short detection time, that is, the fault signal processing and diagnosis accuracy of the motor heat recovery system of the IoT is high and the detection time is short.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68259686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An efficient boundary meshfree computational approach for 3D multi-domain transient thermal analysis with variable thermal sources in nonhomogeneous media 非均匀介质中变热源三维多域瞬态热分析的有效边界无网格计算方法
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230215099l
Jing Ling, Dong-Sheng Yang, Hong-Ying Wang, Hong-Zhong Mou
{"title":"An efficient boundary meshfree computational approach for 3D multi-domain transient thermal analysis with variable thermal sources in nonhomogeneous media","authors":"Jing Ling, Dong-Sheng Yang, Hong-Ying Wang, Hong-Zhong Mou","doi":"10.2298/tsci230215099l","DOIUrl":"https://doi.org/10.2298/tsci230215099l","url":null,"abstract":"Solutions of 3D multi-domain transient thermal analysis with variable thermal sources in nonhomogeneous media are separated into homogeneous and special solutions by an efficient boundary meshfree computational approach, namely virtual boundary meshfree Galerkin method. Homogeneous solutions are expressed by the virtual boundary element method. The virtual source functions of homogeneous solutions and the unknowable coefficients of special solutions can be formed by the radial basis function interpolation. Considering the control equation, the boundary and continuous conditions, and using the Galerkin method, the discrete formula for 3D multi-domain transient thermal analysis with variable thermal sources in nonhomogeneous media can be obtained. This discrete equation has symmetry. Meanwhile, in order to illustrate the steps of implementation more clearly, the final detailed implementation process is given. The numerical results of two calculation examples are obtained and compared to other methods and exact solutions. The proposed method's stability and exactness are validated for 3D multi-domain transient thermal analysis with variable thermal sources in nonhomogeneous media.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68259725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solar heat collection photoelectric tracking servo drive system based on cloud computing 基于云计算的太阳能集热光电跟踪伺服驱动系统
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302141w
H. Wei
{"title":"Solar heat collection photoelectric tracking servo drive system based on cloud computing","authors":"H. Wei","doi":"10.2298/tsci2302141w","DOIUrl":"https://doi.org/10.2298/tsci2302141w","url":null,"abstract":"In order to solve the problem of high cost and low utilization of solar power generation, the author proposed a solar heat collection photoelectric tracking servo drive system based on cloud computing. By establishing the MATLAB/SIMULINK simulation mathematical model of PID and adaptive fuzzy PID control in the core controller PLC, the authors compare and analyze the response characteristics of the tracking control system under different control strategies under the action of unit step signal and disturbance. The experimental results show that the overshoot of the adaptive fuzzy PID control algorithm is very small, almost zero, the response speed is the fastest, the transition time is the shortest, the system reaches stability at about 0.02 second. In conclusion the tracking control system of solar concentrator under adaptive fuzzy PID control not only has good tracking control accuracy, but also has the advantages of strong anti-interference ability and good stability, which greatly improves the comprehensive performance of the tracking control system of solar concentrator.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of thermal energy storage technology in power grid topology 储能技术在电网拓扑中的应用
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302199b
Xunge Bao, Qing Cai, Ji Zhang, Tianting Shang
{"title":"Application of thermal energy storage technology in power grid topology","authors":"Xunge Bao, Qing Cai, Ji Zhang, Tianting Shang","doi":"10.2298/tsci2302199b","DOIUrl":"https://doi.org/10.2298/tsci2302199b","url":null,"abstract":"In order to solve the problem of grid topology optimization, the author proposes the application of renewable energy and energy storage technology in the grid topology. The author first defines the grid graph data model, then designs a grid topology analysis framework, and finally realizes several grid topology analysis applications on this basis. The experimental results show that graph database can better support the concurrent analysis of large-scale users, and the average time required for analysis is significantly less and the advantages are greater. When the number of users reached 200, it took 0.07 seconds for graph database and 0.13 seconds for relational database. In conclusion, the power grid topology analysis method based on renewable energy and energy storage technology can greatly improve the performance and meet the needs of practical scheduling.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of coil pitch on heat transfer enhancement of a turbulent flow of α-Al2O3/DW nanofluid through helical coils 螺旋线圈螺距对α-Al2O3/DW纳米流体湍流强化传热的影响
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230227131a
M. Abdullah, A. Hussein
{"title":"Impact of coil pitch on heat transfer enhancement of a turbulent flow of α-Al2O3/DW nanofluid through helical coils","authors":"M. Abdullah, A. Hussein","doi":"10.2298/tsci230227131a","DOIUrl":"https://doi.org/10.2298/tsci230227131a","url":null,"abstract":"The current study experimentally examines the impact of coil pitch on heat transfer behavior and friction factor through helical coils for ?- Al2O3/Distilled water nanofluid turbulent flow. These tests were conducted on coils with coil pitches of 20, 35, and 50 mm. The nanoparticle volume fraction was 0.1%. The nanoparticles in a 0.1% volume concentration of nanofluid increased the heat transfer rate and friction factor compared to those of distilled water. Increases in coil pitch also resulted in greater heat transfer efficiency. A correlation between the Reynolds number, the Prandtl number, and the curvature ratio of the coil was also shown to be connected to the Nusselt numbers for the flow of nanofluids within the coils.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Artificial intelligence control system of heat recovery in thermal power plant 火电厂热回收人工智能控制系统
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302241q
Hui-juan Qi, Hong-Kang Wen, Aixue Xu
{"title":"Artificial intelligence control system of heat recovery in thermal power plant","authors":"Hui-juan Qi, Hong-Kang Wen, Aixue Xu","doi":"10.2298/tsci2302241q","DOIUrl":"https://doi.org/10.2298/tsci2302241q","url":null,"abstract":"In order to improve the comprehensive utilization rate of energy in power plants, the author puts forward the research of artificial intelligence control system for heat and power plant waste heat recovery. In the heating system of waste heat recovery, intelligent time-sharing and zoning control is set according to user needs, which enables the heating system to adjust the temperature of heating water outlet in real time according to the dynamic change of outdoor climate, in the heating system of waste heat recovery, intelligent time-sharing and zoning control is set according to user needs, which enables the heating system to adjust the temperature of heating water outlet in real time according to the dynamic change of outdoor climate. The results show that the energy saving rate of time-sharing heating increases with the increase of outdoor temperature, when the outdoor temperature is 8?C, the energy saving rate is 0.35, in addition, the energy saving rate of the heating system is not only related to the outdoor temperature, but also to the length of the intermittent period, it is obvious that the longer the intermittent period is, the higher the energy saving rate is. In conclusion, the application of time division temperature control technology in the heating system greatly improves the energy saving effect of buildings, saves energy, and has extremely high economic, environ?mental and social benefits, which is worth advocating and promoting.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical and experimental research on the thermal energy management system of direct expansion solar heating 直接膨胀式太阳能采暖热能管理系统的理论与实验研究
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302991y
Weifang Yu
{"title":"Theoretical and experimental research on the thermal energy management system of direct expansion solar heating","authors":"Weifang Yu","doi":"10.2298/tsci2302991y","DOIUrl":"https://doi.org/10.2298/tsci2302991y","url":null,"abstract":"The author has established the experimental device of the direct expansion solar heat pump system. In this device, the bare plate solar collector is also used as a heat pump evaporator. Under the sunny weather in May, the author conducted an experimental study on the heat pump system. The experimental results show that during the whole experiment, the COP, and the heat collection efficiency of the system reached 2.50-3.35 and 50.0-75.2%, respectively. At the same time, the influence of solar irradiance, condensation temperature and other parameters on the COP and heat collection efficiency of the system is analyzed and discussed, so as to provide some reference for the application of the system.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"11 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Suitability evaluation of urban human settlements based on fuzzy clustering analysis a case study of Hebei Province 基于模糊聚类分析的城市人居环境适宜性评价——以河北省为例
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303009y
Zi-Xing Yuan, Xiaohua Yang, Yuqi Li
{"title":"Suitability evaluation of urban human settlements based on fuzzy clustering analysis a case study of Hebei Province","authors":"Zi-Xing Yuan, Xiaohua Yang, Yuqi Li","doi":"10.2298/tsci2303009y","DOIUrl":"https://doi.org/10.2298/tsci2303009y","url":null,"abstract":"The suitability evaluation of urban human settlements is an important foundation to promote the sustainable development of urban human settlements. This paper took 11 prefecture-level cities in Hebei Province as the research area, and selected 18 indicators from four aspects of ecological environment quality, socio-economic status, living conditions, infrastructure and public services to construct an evaluation index system for the suitability evaluation of the human settlement environment in Hebei Province. The fuzzy clustering analysis method was used to divide the suitability of the human settlement environment in Hebei Province in 2017. The results showed that there are obvious regional differences of human settlement environment suitability in Hebei Province, the findings provide experience for the sustainable development of human settlement environment in Hebei Province.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magic ramie rope for the tug-of-war game 魔术麻绳拔河游戏
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303127l
Guo-Liang Liu, Hong-Zhi Zhao, Fu-Juan Liu, Xiao-Xia Li, Xi-Bo Hao
{"title":"Magic ramie rope for the tug-of-war game","authors":"Guo-Liang Liu, Hong-Zhi Zhao, Fu-Juan Liu, Xiao-Xia Li, Xi-Bo Hao","doi":"10.2298/tsci2303127l","DOIUrl":"https://doi.org/10.2298/tsci2303127l","url":null,"abstract":"The tug of war is a sport known for strength, however a weaker team can also win the game by a suitable team co-operation. A mathematical model is established, showing that the team co-operation or rhythmical frequency plays an important role in victory. A team can win even the rope is pulled to the opposite direction depending upon the rhythmical frequency. A criterion for rhythmical frequency is obtain to guarantee victory when the strength is almost same for both teams. Additionally the rope pulling can be also used for moving a heavy weight object, the principle might be used for building the great pyramids in ancient Egypt. Finally magic ramie ropes with special thermoplastic properties and controllable frequency are discussed.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68261926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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