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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
Numerical investigation of thermal hydraulic performance of a automobile heat transfer tube with ellipsoid dimples 带有椭球凹窝的汽车换热管热工性能数值研究
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230313134z
Xiang Zhang, Ying Huang, Jing Zeng, Zong-xiong Ma, Jian-fei Song, Lunjun Chen, Tong Gao
{"title":"Numerical investigation of thermal hydraulic performance of a automobile heat transfer tube with ellipsoid dimples","authors":"Xiang Zhang, Ying Huang, Jing Zeng, Zong-xiong Ma, Jian-fei Song, Lunjun Chen, Tong Gao","doi":"10.2298/tsci230313134z","DOIUrl":"https://doi.org/10.2298/tsci230313134z","url":null,"abstract":"The heat transfer tube is one of the key components affecting the heat transfer performance of automobile radiators. Proposes a new kind of heat transfer tube with ellipsoidal dimples based on the elliptical heat transfer tube. The effects of the arrangement and pitch ellipsoidal dimples on the turbulent heat transfer and flow resistance of the heat transfer tube are further studied by numerical simulation in the range of Reynolds number in 4080~24480. The results show that the ellipsoid dimple arrangement makes the near-wall fluid produce different flow forms, which enhances the turbulence degree of the tube fluid and thus improves the convective heat transfer capacity of the tube. Among them: vertical parallel arrangement (Case1) causes convergent flow, oblique parallel arrangement (Case2) causes helical flow, and diagonal symmetrical arrangement (Case3) causes cross-helical flow. The cross-helical flow causes the most significant degree of turbulence, followed by the helical flow. Furthermore, the arrangement and pitch of the ellipsoidal dimples also have an essential influence on the heat transfer performance and flow resistance of the heat transfer tube. The Nusselt number and Friction factor of Case1, Case2 and Case3 increase successively. But the Nusselt number and Friction factor gradually decrease with the rise of the pitch of ellipsoidal dimples. However, under different ellipsoidal dimples pitch, the comprehensive performance of Case1, Case2 and Case3 is better than that of smooth elliptical tubes. Among them, Case3 has the best performance when P=15mm, and the performance evaluation criteria value is up to 1.39.","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":"68262000","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
Variational method to fractal long-wave model with variable coefficients 变系数分形长波模型的变分方法
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303779m
Q. Ma, Ruifu Yuan, Chun Wang
{"title":"Variational method to fractal long-wave model with variable coefficients","authors":"Q. Ma, Ruifu Yuan, Chun Wang","doi":"10.2298/tsci2303779m","DOIUrl":"https://doi.org/10.2298/tsci2303779m","url":null,"abstract":"In this paper, a regularized long wave travelling along an unsmooth boundary is depicted by the fractal calculus, and its fractal variational principle is established via the fractal semi-inverse method, which is very helpful to construct the conservation laws in the fractal space and to study the structure of the analytical solution, and a fractal solitary wave solution is obtained.","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":"68262653","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
Approximate analytical solutions of generalized fractional Korteweg-de Vries equation 广义分数阶Korteweg-de Vries方程的近似解析解
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303873d
S. Deng, Zihao Deng
{"title":"Approximate analytical solutions of generalized fractional Korteweg-de Vries equation","authors":"S. Deng, Zihao Deng","doi":"10.2298/tsci2303873d","DOIUrl":"https://doi.org/10.2298/tsci2303873d","url":null,"abstract":"In this paper, a generalized Korteweg-de Vries equation involving a temporal fractional derivative and a spatial fractal derivative is studied. The temporal fractional derivative can describe the non-local property and memory property, while the spatial fractal derivative can model the space discontinuity. Its approximate analytical solution is presented using He?s variational iteration method, which is extremely effective for the fractal-fractional differential equations.","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":"68262697","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
Galerkin approach to approximate solutions of some boundary value problems 一些边值问题近似解的伽辽金方法
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303957t
YiMin Tian, Xiu-Qing Peng
{"title":"Galerkin approach to approximate solutions of some boundary value problems","authors":"YiMin Tian, Xiu-Qing Peng","doi":"10.2298/tsci2303957t","DOIUrl":"https://doi.org/10.2298/tsci2303957t","url":null,"abstract":"This paper uses the Galerkin method to find approximate solutions of some boundary value problems. The solving process requires to solve a system of algebraic equations, which are large and difficult to be solved. According to the Groebner bases theory, an improved Buchberger's algorithm is proposed to solve the algebraic system. The results show that the Galerkin approach is simple and efficient.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"55 9 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68262888","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
Silica dopant effect on the performance of calcium carbonate/calcium oxide based thermal energy storage system 二氧化硅掺杂对碳酸钙/氧化钙基储能系统性能的影响
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230422165k
A. Khosa, Najam-ul-Hassan Shah, Xinyue Han, N. Husnain
{"title":"Silica dopant effect on the performance of calcium carbonate/calcium oxide based thermal energy storage system","authors":"A. Khosa, Najam-ul-Hassan Shah, Xinyue Han, N. Husnain","doi":"10.2298/tsci230422165k","DOIUrl":"https://doi.org/10.2298/tsci230422165k","url":null,"abstract":"CaCO3 is being studied for its application in thermal energy storage. However, it has drawbacks of slow reaction rate during calcination and incomplete reversible carbonation which limit its use. In this paper, SiO2 has been studied as a dopant for CaCO3 to improve its cyclic performance. CaCO3 samples were loaded with different concentrations of SiO2 and its effect on the thermal energy density of CaCO3 was determined. Afterwards, the effect of the dopant on the heat storage process of the synthesized composite along with kinetics of decarbonation reaction was investigated. Cyclic tests were performed to determine the reusability of the material. It was found that the addition of dopant helped to increase the rate of decarbonation reaction, thereby making the heat storage process more efficient as compared to pure CaCO3. The activation energy values are 255.9, 280.1, 244.9 and 234.8 kJ/mol for 5%, 15%, 30% and 0% doped SiO2 samples, respectively. Furthermore, thermal energy storage density increases when the amount of dopant decreases in the samples such as the 30% and 5% doped samples have gravimetric energy storage densities of 339.85 and 759.24 J/g, respectively. It was observed that the large quantities (15% and 30%) of dopant had introduced a new phase of Ca3SiO5 during CaCO3 decomposition.","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":"68264147","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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