Archives of Thermodynamics最新文献_第7页

Mathematical modeling of hydrogen production performance in thermocatalytic reactor based on the intermetallic phase of Ni3Al 基于Ni3Al金属间相的热催化反应器制氢性能数学建模

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2019.129547

J. Badur, M. Stajnke, P. Ziółkowski, P. Jóźwik, Z. Bojar, P. Ziółkowski

引用次数: 8

Thermodynamic analysis of modular high-temperature nuclear reactor coupled with the steam cycle for power generation 模块化高温核反应堆和蒸汽循环耦合发电的热力学分析

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2019.130007

M. Dudek, M. Jaszczur, Z. Kolenda

{"title":"Thermodynamic analysis of modular high-temperature nuclear reactor coupled with the steam cycle for power generation","authors":"M. Dudek, M. Jaszczur, Z. Kolenda","doi":"10.24425/ather.2019.130007","DOIUrl":"https://doi.org/10.24425/ather.2019.130007","url":null,"abstract":"Consumption of energy is one of the important indicators in developing countries, but a lot of companies from the energy sector have to cope with three key challenges, namely how to reduce their impact on the environment, how to ensure the low cost of the energy production and how to improve the system overall performance? For Polish energy market, the number of challenges is greater. The growing demand for electricity and contemporary development of nuclear power technology allow today’s design, implement new solutions for high energy conversion system low unit cost for energy and fuel production. In the present paper, numerical analysis of modular high-temperature nuclear reactor coupled with the steam cycle for electricity production has been presented. The analysed system consists of three independent cycles. The first two are high-temperature nuclear reactor cycles which are equipped with two high-temperature nuclear reactors, heat exchangers, blowers, steam generators. The third cycle is a Rankine cycle which is equipped with up to four steam turbines, that operate in the heat recovery system. The analysis of such a system shows that is possible to achieve significantly greater efficiency than offered by traditional nuclear reactor technology.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44196171","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

Selection of a numerical model to predict the flowin a fan with a cycloidal rotor 摆线转子风机流量预测的数值模型选择

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.137560

M. Majkut, S. Dykas, Krystian Smołka

{"title":"Selection of a numerical model to predict the flowin a fan with a cycloidal rotor","authors":"M. Majkut, S. Dykas, Krystian Smołka","doi":"10.24425/ather.2021.137560","DOIUrl":"https://doi.org/10.24425/ather.2021.137560","url":null,"abstract":"A fan with a cycloidal rotor (CRF) is a promising design for application in HVAC (heat, ventilation and air conditioning) systems. Despite the widespread use of the CRF design as a form of propulsion, there are practically no scientiﬁc publications examining the possibility of using it as the HVAC fan. The choice of the cycloidal rotor facilitates the operating procedure and widens the range of operating conditions. The paper focuses on the use of the CRF in HVAC, especially as a blowing machine integrated with rectangular ducts, presenting, and discussing the search for the most eﬃcient numerical model. The way of discretizing the computational domain, the turbulence models and the time integration method were tested. A four-blade open rotor fan with a cycloidal impeller was used both in the numerical and in the experimental model. The 2D and 3D CRF models created in the Ansys CFX package were adopted. After a mesh-independence study, diﬀerent turbulence models were tested for the selected mesh. In the case of the 2D model, various turbulence models such as the SST and the RNG k - ε options were tested and compared with each other. The computational ﬂuid dynamics simulations were compared with in-house experimental results of the velocity ﬁeld measurements performed by means of laser Doppler anemometry and thermoanemometry. It turned out that the considered numerical models did not reﬂect the experimental measurements quantitatively. This may be due to the small diﬀerences in the shapes of the cycloids of the rotor blades in the numerical model and in real geometry.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44471302","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

Novel model for emptying of a self-pressurised nitrous oxide tank 自压一氧化二氮储罐排空的新模型

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.143176

Jakub Szymborski

{"title":"Novel model for emptying of a self-pressurised nitrous oxide tank","authors":"Jakub Szymborski","doi":"10.24425/ather.2022.143176","DOIUrl":"https://doi.org/10.24425/ather.2022.143176","url":null,"abstract":"Nitrous oxide is often used in the space industry, as an oxidiser or monopropellant, mostly in self-pressurised conﬁgurations. It has potential for growth in use due to the recent rising interest in green propellants. At the same time, modelling the behaviour of a self-pressurising nitrous oxide tank is a challenging task, and few accurate numerical models are currently available. Two-phase ﬂow, heat transfer and rapid changes of mass and temperature in the investigated system all increase the diﬃculty of accurately predicting this process. To get a get better understanding of the emptying of a self-pressurised nitrous oxide tank, two models were developed: a phase equilibrium model (single node equilibrium), treating the control volume as a single node in equilibrium state, and a phase interface model, featuring a moving interface between parts of the investigated medium. The single node equilibrium model is a variation of equilibrium model previously described in the literature, while the phase interface model involves a novel approach. The results show that the models are able to capture general trends in the main parameters, such as pressure or temperature. The phase interface model predicts nitrous oxide as a liquid, a two-phase mixture, and vapour in the lower part of the tank, which is reﬂected in the dynamics of changes in pressure and mass ﬂow rate. The models developed for self-pressurisation, while created for predicting nitrous oxide behaviour, could be adapted for other media in conditions near vapour– liquid equilibrium by adding appropriate state equations.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46341807","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

Analysis of selected aspects of a tank gassing-up process on board liquefied petroleum gas carrier. Part I 液化石油气船上储罐充气过程的选定方面分析。第一部分

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.137552

A. Wieczorek

引用次数: 0

Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine 应用创新解决方案提高220兆瓦核电厂汽轮机LPC流动部分的效率

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.140925

A. Rusanov, Viktor H. Subotin, V. Shvetsov, Roman RUSANOVa, Serhii A. Palkov, I. Palkov, M. Chugay

{"title":"Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine","authors":"A. Rusanov, Viktor H. Subotin, V. Shvetsov, Roman RUSANOVa, Serhii A. Palkov, I. Palkov, M. Chugay","doi":"10.24425/ather.2022.140925","DOIUrl":"https://doi.org/10.24425/ather.2022.140925","url":null,"abstract":"The results of the gas-dynamic calculation of the low-pressure cylinder ﬂow part of the K-220-44 type steam turbine intended for operation at nuclear power plants are presented. The ways of the ﬂow part improvement were determined. Some of those ways include the use of innovative approaches that were not previously used in steam turbines. The design of the new ﬂow part was carried out on the basis of a comprehensive methodology implemented in the IPMFlow software package. The methodology includes gas-dynamic calculations of various levels of complexity, as well as methods for analytical construction of the spatial shape of the blade tracts based on a limited number of parameterized values. The real thermodynamic properties of water and steam were taken into account in 3D calculations of turbulent ﬂows. At the ﬁnal step, end-to-end 3D calculations of the low-pressure cylinder that consists of 5 stages were performed. The technology of parallel computing was applied in those calculations. It is shown that due to the application of innovative solutions, a signiﬁcant increase in eﬃciency can be achieved in the developed low-pressure cylinder.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47478978","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

Application of computer image analyzes in the investigation of refrigerants condensation in minichannels 计算机图像分析在微通道制冷剂冷凝研究中的应用

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2019.128292

M. Sikora, T. Bohdal

引用次数: 3

Numerical studies of air humidity importance in the first stage rotor of turbine compressor 空气湿度对透平压气机一级转子影响的数值研究

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2020.135861

S. Dykas, G. Zhang

引用次数: 5

Performance analysis and PCM selection for adsorption chiller aided by energy storage supplied from the district heating system 区域供热系统储能辅助吸附式制冷机性能分析及PCM选择

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.144409

J. Karwacki

引用次数: 0

Modelling of back propagation neural network to predict the thermal performance of porous bed solar air heater 多孔床太阳能空气加热器热性能预测的反向传播神经网络建模

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2019.131430

Harish Kumar Ghritlahre, R. K. Prasad

{"title":"Modelling of back propagation neural network to predict the thermal performance of porous bed solar air heater","authors":"Harish Kumar Ghritlahre, R. K. Prasad","doi":"10.24425/ather.2019.131430","DOIUrl":"https://doi.org/10.24425/ather.2019.131430","url":null,"abstract":"The objective of present work is to predict the thermal performance of wire screen porous bed solar air heater using artiﬁcial neural network (ANN) technique. This paper also describes the experimental study of porous bed solar air heaters (SAH). Analysis has been performed for two types of porous bed solar air heaters: unidirectional ﬂow and cross ﬂow. The actual experimental data for thermal eﬃciency of these solar air heaters have been used for developing ANN model and trained with Levenberg-Marquardt (LM) learning algorithm. For an optimal topology the number of neurons in hidden layer is found thirteen (LM-13).The actual experimental values of thermal eﬃciency of porous bed solar air heaters have been compared with the ANN predicted values. The value of coeﬃ-cient of determination of proposed network is found as 0.9994 and 0.9964 for unidirectional ﬂow and cross ﬂow types of collector respectively at LM-13. For unidirectional ﬂow SAH, the values of root mean square error, mean absolute error and mean relative percentage error are found to be 0.16359, 0.104235 and 0.24676 respectively, whereas, for cross ﬂow SAH, these values are 0.27693, 0.03428, and 0.36213 respectively. It is concluded that the ANN can be used as an appropriate method for the prediction of thermal performance of porous bed solar air heaters.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47526996","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: 8