Thermophysics and Thermal Power Engineering最新文献

{"title":"ON THE NEW LOOK AT THE DYNAMICS OF THE EARTH'S CLIMATE (REVIEW)","authors":"B. Basok, T. T. Bazeev","doi":"10.31472/TTPE.2.2019.7","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.7","url":null,"abstract":"The review presents approaches with respect to the properties of the Earth’s climate system, which do not coincide with generally accepted ones. The results of recent studies show a more complex (stepwise) temporal dynamics of global temperature, which suggests the presence of a thermoregulatory mechanism in the climate system, which, if identified, will be able to estimate the likelihood of a transition to an increase or decrease in global temperature. The results of studies of the mechanism of solar-magnetic activity as the main cause of global warming are also given.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84774721","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}

{"title":"EXPERIMENTAL RESEARCH OF THERMAL STABILITY OF SUBSTANCES FOR THERMAL ENERGY STORAGE","authors":"V. Demchenko, V. Falco","doi":"10.31472/TTPE.2.2019.9","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.9","url":null,"abstract":"Optimizing the storage methods for excess heat energy and associated technical and technological solutions has a significant impact on the development of LHTES systems. New technologies for storing thermal energy are increasingly an alternative to the classic methods of providing thermal infrastructure facilities. In this paper we analyze the results of experimental studies of heat-storage materials for their further integration into the Smart Grid heating system of infrastructure objects and use in the M-TES. The conducted literary review showed that the thermophysical parameters of the investigated substances for the conservation of heat from different authors are very different. We conclude that this is due to the quality of the materials being studied and the errors of laboratory measurements. This negatively affects the design of LHTES systems and greatly complicates the calculation and modeling of heat transfer processes. It is especially important to correctly determine the amount of heat that can be obtained during the charging and discharge cycles of TES, as well as the lifetime of the material that accumulates heat. Therefore, the purpose of this work is to identify the appropriate material for energy storage applications between 0 0C and 115 0C and evaluate it, depending on the thermophysical properties and the time of stable operation. Taking into account the economic aspects, only the available technical materials are considered within the framework of this study, since the choice of material is aimed at the use of M-TES in real conditions of operation. Figure 1 summarizes the results of research on heating and cooling cycles of heats of heat storage substances. High thermal power and, hence, high thermal conductivity are important for the storage efficiency of PCM, especially in the process of solidification, because in a heat transfer predominant solid layer that grows continuously. However, both PCMs are not suitable for mobile thermal storage systems in this form. The huge disadvantages are the emergence of different values ​​of the melting point, the high retention time of both candidates, as well as their prices. Therefore, further research should be directed to eliminate these negative effects. Despite the relatively low density of heat storage with aqueous solutions of antifreeze, they are beneficial candidates for waste heat transfer systems within the framework of this study. Addition of NaCl salt practically does not affect the speed of heating and cooling of the coolant. The addition of bischofite worsens the thermophysical properties of water and shows a small density of heat accumulation. It has been experimentally established that after 3 ... 4 cycles of heating and cooling from a solution of technical bischofite, a dark yellow, insoluble precipitate forms, which creates problems during the operation. Significant increase in TES discharge time was obtained when testing ozokerite. All of the above substances have shown ","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"21 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78021327","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}

{"title":"REDUCTION OF NATURAL GAS CONSUMPTION AND REDUCTION OF EMISSIONS WITH COMBUSTION PRODUCTS IN MUNICIPAL HEAT SUPPLY","authors":"O. Sigal, N. Pavlyuk, S. Pashyhin","doi":"10.31472/TTPE.2.2019.8","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.8","url":null,"abstract":"The technical solutions are proposed to reduce the consumption of natural gas, as well as to reduce emissions with combustion products in the municipal heat supply systems: \u0000- New constructions of water-tube and water-fire-tube boilers with improved technical, economic and environmental characteristics have been developed. Replacing of old boilers with these boilers within Ukraine will provide an economic effect of about 100 thousand tons of fuel equivalent per year. NOx reduction will be up to 35%; \u0000- The new temperature mode for heating networks 115/70 oС has been developed, which provides the amount of heat that is adequate to the needs of consumers, and is appropriate for use in cities of the country from an economic point of view. However, the implementation of such reduced temperature mode requires a corresponding change in the general requirements when issuing \"Technical Specifications\" for connection to district heating systems, necessitates changes in the temperature mode values in other documents, for example the general plan of the city, as well as the possible need to change the calculated heat loads in concluded contracts for heat supply to consumers.  Nevertheless, the correction of temperature modes of cities should be considered as one of the possible measures to improve the energy efficiency of heat supply systems; \u0000- The expediency of partial replacement of natural gas in the municipal heat supply systems of large cities of Ukraine with municipal solid waste (MSW) has been proved. The ways of improving the efficiency of mixed MSW combustion in conditions of country, including the extraction of \"wet\" biowaste from the total mass of mixed MSW with using a separate collection. are determined; \u0000- To achieve compliance with the new more stringent European environmental standards, the highly efficient devices for cleaning combustion products from particulate matter and sulfur oxides have been developed. The efficiency of dust removal in centrifugal filters is 90...98%, in cyclone dust collectors - 90...93%. Desulfurization efficiency is up to 50%.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83421579","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}

{"title":"ABOUT SOME OF THE POSSIBILITIES OF USING HEAT PUMPS IN PROCESSES THAT INVOLVE THE MOVEMENT OF SUBSTANCE","authors":"O. S. Kshevetsky","doi":"10.31472/ttpe.3.2019.10","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.10","url":null,"abstract":"Implemented theoretical and experimental evaluation studies and analysis of some possible processes involving mobile substance and heat pumps, in which at least part of the mobile substance is brought into thermal contact with the heat-absorbing and heat-releasing heat exchange parts of at least two heat pumps, in particular, for the case of condensation of water vapor from moving air and/or evaporation of water into moving air. Some possibilities of improving the energy efficiency of these processes are considered. A brief description of these studies, as well as a description of some features and examples of possible applications of these processes are given.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76448722","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}

{"title":"APPROXIMATE ESTIMATES OF COMPLEX HEAT EXCHANGE IN OPTICALLY THICKNESS AND OPTICALLY THIN TURBULENT BOUNDARY LAYER","authors":"A. Avramenko, N. P. Dmitrenko, V. M. Kovalenko, V. Gorobets","doi":"10.31472/ttpe.3.2019.3","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.3","url":null,"abstract":"The article analyzes the main aspects of the process of complex heat transfer in an optically thin and optically thick boundary turbulent layer.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73924054","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}

{"title":"PROCESSING GARBAGE CONTAINING PLASTICS (REVIEW)","authors":"І.V. Voloshina","doi":"10.31472/ttpe.3.2019.13","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.13","url":null,"abstract":"This article considers existing types of plastics, emphasizes the importance and economic feasibility their recycling and the methods burning non-recyclable wastes containing plastic.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89630484","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}

{"title":"POWER EFFICIENCY OF THE “WET” COMBUSTION AND POLLUTANTS FORMATION REDUCTION","authors":"B. Soroka, V. Zgurskyi","doi":"10.31472/ttpe.3.2019.8","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.8","url":null,"abstract":"Grounded upon CFD-modeling and the thermodynamic analysis, the ways of enhancement the efficiency of using the natural gas and of nitrogen oxides effluents reduction are considered for the conditions of humidified combustion air.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87375597","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}

{"title":"FEATURES OF FLOWING ROUND AND HEAT TRANSFER OF ONE-ROW OF CYLINDERS WITH SPIRAL GROOVES IN INTERACTION WITH A CROSS - FLOW OF AIR","authors":"A. Khalatov, G. Kovalenko, M. Muliarchuk","doi":"10.31472/TTPE.2.2019.2","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.2","url":null,"abstract":"The results of an experimental study of the average heat transfer, hydraulic resistance and vortex structure at the cross flow of a single-row of round cylinders with spiral grooves on the external surface are presented. The equations of similarity on the average heat transfer and hydraulic resistance were obtained","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73110404","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}

{"title":"OPTIMIZATION OF EVAPORATION-AND-CONDENSATION HEAT-EXCHANGER PERFORMANCE","authors":"A. Gershuni, Ye.N. Pysmennyy, A. P. Nishchik","doi":"10.31472/TTPE.2.2019.6","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.6","url":null,"abstract":"The paper is relevant to optimization of the performance of gas-to-gas heat exchangers based on vertical transversely finned heat-transferring elements of evaporation-and-condensation type. The correlations taking into account the regularities of heat transfer for estimation of optimal ratio of the lengths of evaporation and condensation zones, under which the heat-transfer system has the minimum transferring surface corresponding to the specified conditions, were obtained.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"130 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88762638","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}

{"title":"PECULIARITIES OF FLOW AND MIXTURE FORMATION IN MICROIET BURNER DEVICES WITH ASYMMETRIC FUEL DISTRIBUTION","authors":"N. Fialko, Ju.V. Sherenkovskyi, N. Meranova, S. A. Alioshko, K. Rokytko","doi":"10.31472/TTPE.1.2019.2","DOIUrl":"https://doi.org/10.31472/TTPE.1.2019.2","url":null,"abstract":"The purpose of the work is to establish the regularities of the isothermal flow and the mixture formation of the fuel gas and oxidant in the microjet burner devices with an asymmetric fuel supply. The main tasks of the work are the analysis of the effects of the influence of the value of excess air factor on the flow structure and the features of the mixing of fuel and oxidant. As a method of research, the CFD modeling method using the FLUENT code was used. According to the results of the studies carried out in the relatively wide limits of the change in the excess air factor (1.5 ≤ α ≤ 4.0), the regularities of the effect of the value of this factor on such flow characteristics in the burners studied as the length of the reverse current zone behind the flame stabilizer, which is responsible for the combustion stability, the location of main vortex in this zone, the values of the mean-square velocity pulsations, and so on. The features of the mixture formation in the variation of the α value in the burner devices under investigation are revealed. The dependence on the mean α of the methane concentration in the reciprocal zone is established and given its interpretation, taking into account a number of competing factors.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88827434","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}