Archives of Thermodynamics最新文献_第9页

Design and performance analysis of ORC centrifugal pumps ORC离心泵的设计与性能分析

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2020.135860

P. Klonowicz, P. Lampart, Ł. Witanowski, D. Zaniewski, Łukasz Jędrzejewski, Tomasz

引用次数: 0

Cooling water flow influence on power plant unit performance for various condenser configurations setup 不同冷凝器配置设置下冷却水流量对发电厂机组性能的影响

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.140929

引用次数: 0

Thermodynamic analysis of a combined cycle power plant located in Jordan: A case study 约旦联合循环发电厂的热力分析：一个案例研究

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2020.132951

K. Bataineh, B. Khaleel

{"title":"Thermodynamic analysis of a combined cycle power plant located in Jordan: A case study","authors":"K. Bataineh, B. Khaleel","doi":"10.24425/ather.2020.132951","DOIUrl":"https://doi.org/10.24425/ather.2020.132951","url":null,"abstract":"Efficiency and electrical power output of combined cycle power plants vary according to the ambient conditions. The amount of these variations greatly affects electricity production, fuel consumption, and plant incomes. Obviously, many world countries have a wide range of climatic conditions, which impact the performance of power plants. In this paper, a thermodynamic analysis of an operating power plant located in Jordan is performed with actual operating data acquired from the power plant control unit. The analysis is performed by using first and second laws of thermodynamics. Energy and exergy efficiencies of each component of the power plant system are calculated and the effect of ambient temperature on the components performance is studied. The effects of gas turbine pressure ratio, gas turbine inlet temperature, load and ambient conditions on the combined cycle efficiency, power outputs and exergy destruction are investigated. Energy and exergy efficiencies of the combined cycle power plant are found as 45.29%, and 42.73% respectively when the ambient temperature is 34 ◦C. Furthermore, it is found that the combustion chamber has the largest exergy destruction rate among the system components. The results showed that 73% of the total exergy destruction occurs in the combustion chamber when the ambient temperature is 34 ◦C. Moreover, the results show that the second major exergy loss is in HRSC. The results show that the energy and exergy efficiency of the combined cycle power plant decreases as the ambient temperature increases. According to the calculation results, improvement and modification suggestions are presented.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47932416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

New expression to calculate quantity of recovered heat in the earth-pipe-air heat-exchanger operating in winter heating mode 计算冬季供暖模式下土管式空气换热器回收热量的新表达式

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2020.133624

V. Molcrette, V. Autier

引用次数: 1

Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler 木屑颗粒在低功率多燃料自动加煤供暖锅炉中的燃烧

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.140930

W. Zima

{"title":"Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler","authors":"W. Zima","doi":"10.24425/ather.2022.140930","DOIUrl":"https://doi.org/10.24425/ather.2022.140930","url":null,"abstract":"This paper presents a test stand equipped, among others, with two boilers intended for the combustion of solid fuels. The ﬁrst is a single-fuel boiler designed to burn wood pellets only. The second is a multi-fuel boiler intended for the combustion of mainly hard coal (basic fuel) with the grain size of 0.005–0.025 m. Wood pellets can also be ﬁred in this boiler, which in such a case are treated as a substitute fuel. There is a developed and veriﬁed algorithm for the control of the multi-fuel boiler operation in a wide range of loads for the basic fuel. However, for the substitute fuel (wood pellets) there are no documented and conﬁrmed results of such testing. The paper presents selected results of testing performed during the combustion of wood pellets in a multi-fuel automatically stoked boiler. Several measuring series were carried out, for which optimal operating conditions were indicated. These conditions may serve as the basis for the development of the boiler operation control algorithm. A detailed analysis was carried out of the ﬂue gas temperatures obtained at the outlet of the boiler combustion chamber and of the contents of carbon monoxide and oxygen in the boiler ﬂue gases.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49538403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Relation between thermal conductivity and coordination number for fibre-reinforced composite with random distribution of fibres 纤维随机分布纤维增强复合材料的导热系数与配位数的关系

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2019.128288

P. Darnowski

引用次数: 1

Performance of a combined cycle power plant due to auxiliary heating from the combustion chamber of the gas turbine topping cycle 燃气轮机顶循环燃烧室辅助加热对联合循环电厂性能的影响

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.136952

Mohammad Nadeem Khan

{"title":"Performance of a combined cycle power plant due to auxiliary heating from the combustion chamber of the gas turbine topping cycle","authors":"Mohammad Nadeem Khan","doi":"10.24425/ather.2021.136952","DOIUrl":"https://doi.org/10.24425/ather.2021.136952","url":null,"abstract":"Energy demand is increasing exponentially in the last decade. To meet such demand there is an urgent need to enhance the power generation capacity of the electrical power generation system worldwide. A combi-ned-cycle gas turbines power plant is an alternative to replace the existing steam/gas electric power plants. The present study is an attempt to investigate the eﬀect of diﬀerent parameters to optimize the performance of the combined cycle power plant. The input physical parameters such as pressure ratio, air fuel ratio and a fraction of combustible product to heat recovery heat exchanger via gas turbine were varied to determine the work output, thermal eﬃciency, and exergy destruction. The result of the present study shows that for maximum work output, thermal eﬃciency as well as total exergy destruction, extraction of combustible gases from the passage of the combustion chamber and gas turbine for heat recovery steam generator is not favorable. Work output and thermal eﬃciency increase with an increase in pressure ratio and decrease in air fuel ratio but for minimum total exergy destruction, the pressure ratio should be minimum and air fuel ratio should be maximum.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48511832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of combustion products composition models on the exergetic analysis of spark-ignition engine fuelled with ethanol 燃烧产物组成模型对以乙醇为燃料的火花点火发动机火用分析的影响

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2019.129548

Caio H. Rufino, A. J. T. B. D. Lima, A. P. Mattos, F. U. Allah, Janito V. Ferreir, R. WALDYRL.

{"title":"Effects of combustion products composition models on the exergetic analysis of spark-ignition engine fuelled with ethanol","authors":"Caio H. Rufino, A. J. T. B. D. Lima, A. P. Mattos, F. U. Allah, Janito V. Ferreir, R. WALDYRL.","doi":"10.24425/ather.2019.129548","DOIUrl":"https://doi.org/10.24425/ather.2019.129548","url":null,"abstract":"The engine simulations have become an integral part of engine design and development. They are based on approximations and assumptions. The precision of the results depends on the accuracy of these hypotheses. The simpliﬁed models of frozen composition, chemical equilibrium and chemical kinetics provide the compositions of combustion products for engine cycle simulations. This paper evaluates the eﬀects of diﬀerent operating conditions and hypotheses on the exergetic analysis of a spark-ignition engine. The Brazilian automotive market has the highest number of ﬂex-fuel vehicles. Therefore, a ﬂex-fuel engine is considered for simulations in order to demonstrate the eﬀects of these diﬀerent hypotheses. The stroke length and bore diameter have the same value of 80 mm. The in-cylinder irreversibility is calculated for each case at the closed part of the engine cycle. A comparative analysis of these hypotheses provides a comprehensive eval-uation of their eﬀects on exergetic analysis. Higher values of accumulated irreversibility are observed for the oversimpliﬁed hypothesis.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48636081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental and theoretical investigation of an evacuated tube solar water heater incorporating wickless heat pipes 无芯热管真空管太阳能热水器的实验与理论研究

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2020.134570

H. N. S. Al-Joboory

引用次数: 3

Flow characteristics of an automotive compressor with an additively manufactured rotor disc 一种附加制造转子盘的汽车压缩机的流动特性

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.136944

A. Andrearczyk

{"title":"Flow characteristics of an automotive compressor with an additively manufactured rotor disc","authors":"A. Andrearczyk","doi":"10.24425/ather.2021.136944","DOIUrl":"https://doi.org/10.24425/ather.2021.136944","url":null,"abstract":"This paper presents the results of experimental research regarding the determination of the ﬂow characteristics of the compressor of an automotive turbocharger with a plastic rotor disc. The disc was manufactured using the 3D printing technology called the multijet printing, which allows complex geometries to be printed with high precision. Currently, in addition to speeding up the manufacturing processes and reducing their costs, 3D printing technologies are increasingly seen as standard tools that can be used in the design and optimization of machine parts. This article is a continuation of research on the possibility of applying additively manufactured elements in turbomachines. The experimental research was carried out at high rotational speeds (up to 110 000 rpm), using the automotive turbocharger with two diﬀerent compressor rotors ( i.e. one aluminum and one polymer). The ﬁrst chapters of the paper discuss the preparation stage of the research ( i.e. the manufacture of the rotor, the test rig). Then, the experimental research and the ﬂow characteristics are described. The results obtained for the two types of discs were compared with each other and the area of application of the additively manufactured rotor was determined. The rotor functioned properly in the range of tested operating parameters and the results obtained showed that the technology and material applied could be used in the optimization studies of the blade systems of high-speed ﬂuid-ﬂow machines.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46460051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0