Ventilation, Illumination and Heat Gas Supply最新文献

{"title":"Mathematical Simulation of a Twisted Inlet Jet at Variable Mode with Using Various Turbulence Models","authors":"O. Vozniak, Volodymyr Dovhaliuk, I. Sukholova, O. Dovbush","doi":"10.32347/2409-2606.2019.31.6-15","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.31.6-15","url":null,"abstract":"The article is devoted to the solution of actual task – the efficiency increasing of the air distribution using twisted and wall air jets to provide normative air parameters in premises . The purpose of the paper is to determin e the characteristics of air flow that is formed by twisted and flat wall jet s at alternating air flow and to obtain analytic equations for determining of needed dynamic parameters of the air jets, and also to design the mathematical model of incoming air flow at the alternating air flow . The mathematical model of air supply with twisted and wall air jets is improved. It is shown that for reaching the maximal efficiency of air distribution it is necessary to supply air by jets that intensively decay before entering into a working zone . Simulation of air flow was carried out using the computational fluid dynamic software Ansys FLUENT. Simulation of the flow are carried out by one-parameter Spalart-Allmaras turbulence model and two-parameter k –e turbulence model. Good coincidence between the results of simulation using both tur b ulence models is obtained. The graphical and the analytical dependences on the basis of the conducted experimental research, which can be used in subsequent engineering calculations, are shown. Dynamic parameters of air flow that is formed by t he twisted and wall air jets at alternating air flow has been determined. New 4D method of researches is proposed for researching of jets with alternating parameters of the air. Results of experimental investigations of air supply into the room by air distribution device which creates twisted air jets for obtaining more intensive turbulization of air flow in the room are presented. Obtained results of these investigations give possibility to realize engineer ing calculations of air distribution with twisted and wall air jets.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88842440","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":"Grounding of in-depth exergoeconomic analysis of air conditioning systems","authors":"O. Zadoiannyi","doi":"10.32347/2409-2606.2019.31.24-32","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.31.24-32","url":null,"abstract":"ir-conditioning systems are the most energy-intensive of the indoor climate systems. T hey consume all types of energy produced by energy generating companies. Traditional methodological approaches to the estimation of exergy efficiency do not produce correct results. Ukrain ian national standards do not sufficiently provide methodologies for assessing the energy efficiency of air conditioning systems for buildings .A harmonized methodology is required to properly assess the energy consumption of these systems. The relatively low values of the thermodynamic potentials in th e se systems require the analysis of all components of the wet air exergy, which are thermal, mechanical and chemical : humidity and carbon dioxide. An in-depth exergy analysis, taking into account all the components of moist air exergy, reveals new qualities and determines the partial characteristics in the performance indicators of systems and elements. The analysis of the behavior of the thermal exergy component during the air exchange in the room determines the type of air exchange and energy costs. The analysis of all components shows their commensurability and needs to be properly taken into account in the exergo-economic analysis. The results of in-depth exergo-economic analysis show the new qualities of HVAC systems and their elements in the form of relative and absolute energy- efficiency characteristics. They should be used for optimiz ation of the systems (according to the criteria of minimizing energy consumption), design of the energy-efficient solutions and monitoring the energy consumption during operation of the systems. The research results presented in this article are based on real systems data . Methods for determining the performance of systems have been tested when designing and creating new solutions for the systems","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74735812","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":"Study of Heating Devices Based on a First-Order Phase Transition","authors":"Yurii Podenezhko, M. Kirichenko, N. Chepurna, Volodymyr Chepurnyі","doi":"10.32347/2409-2606.2019.31.63-70","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.31.63-70","url":null,"abstract":"New developments aimed at saving costs for heating a house are attracting more and more attention. The development of highly efficient heating radiators that meet the requirements of modern engineering systems, namely: cost-effectiveness, efficiency, rapid uniform heating of the entire surface, ease of installation and operation, low manufacturing costs and durability is the main direction in the design of heating devices. In recent years, the use of heating radiators based on first-order phase transition has been gaining ground in heating systems in Ukrainian cities. In the literature and on the Internet resource s , there is another name for such kind of the radiators – vacuum radiators. T hey were named because air was completely pumped out of the internal cavity of the sectional structure. This is done in order to reduce the pressure and, accordingly, reduce the evaporation temperature of the secondary coolant. These are ordinary heating appliances externally, but completely different in principle of operation. In fact, the operation of the vacuum radiator is built on the principle of functioning of a sealed two-phase thermosiphon. The main advantage of such solution is the unique coolant circulation system. They can be used both for heating systems and for autonomous ones. There are conflicting opinions about the advisability of using vacuum radiators, so their confirmation or refutation requires in-depth research. This paper presents the results of experimental studies of a heating radiator based on first-order phase transition. As a secondary coolant, a liquid with a low boiling point is used. The principles of operation of the heating device are investigated, thermal capacities are determined at various temperatures of the coolant. A comparison is made with traditional steel and aluminum radiators, . Particular attention was paid to the study of vacuum radiators from the point of view of heat exchange, and their unusual properties were noted. The main advantages and disadvantages of this heating device are revealed. The ways of further research of these types of heating radiators are indicated.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80998350","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":"Ways to Reduce Heat Loss in the Radiator Section of the Building Envelope","authors":"P. Glamazdin, P. Pasichnyk","doi":"10.32347/2409-2606.2019.31.55-62","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.31.55-62","url":null,"abstract":"Reducing heat losses of building envelopes in the radiator section is a well-known energy efficient measure that does not require significant investment and has a fairly significant effect. The main known way is the use of radiator screens of heat-insulating material and a reflective surface that faces to the room. The use of such screens is usually carried out without appropriate calculations and in the absence of specific technical characteristics. When developing new designs of heating devices, it is necessary to take into account the specific features of the heat transfer of the device to the wall in the radiator area and include measures to reduce such heat losses in the device design. The article discusses the new design of the heating device section developed at the Department of Thermal Engineering and various constructive methods for reducing heat loss through the radiator section. The proposed radiator contains heat insulation on the bottom rib of the radiator. Also, the article discusses the features of heat exchange of a radiator with a wall in a radiator area and an in-depth literature review of the works devoted to this topic is carried out. Based on the review, we can conclude that the known works do not give a holistic understanding of heat transfer processes in the studied system of bodies. It was also revealed that the leading manufacturers of heating equipment are working out ways to reduce heat loss through the radiator sections of the building envelope. I n particular, this is the decrease in the temperature, °С, of the wall of the radiator that faces the wall. The results of the article show the possibility of increasing the efficiency of the heating device by almost 4 % and reveal unexplored features of the heat exchange of heating devices and the external wall.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77396542","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 Studies оf Drying Processes of Medicinal Herbs","authors":"D. Guzyk, O. Borshch, A. Rybalka","doi":"10.32347/2409-2606.2019.30.43-50","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.43-50","url":null,"abstract":"","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86692013","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":"Model оf Multifactorial Assessment оf Natural Gas Quality","authors":"K. Predun, Y. Franchuk, Olha Obodianska","doi":"10.32347/2409-2606.2019.30.20-28","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.20-28","url":null,"abstract":"","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87619763","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":"Application of Geothermal Ventilation for Heat Supply of Poultry Premises","authors":"N. Spodyniuk, L. Horbachenko","doi":"10.32347/2409-2606.2019.30.51-55","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.51-55","url":null,"abstract":"","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83344688","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":"Effect of Candles Burning on Ventilation of Premises","authors":"P. Kapalo, O. Vozniak, M. Adamski, O. Dovbush","doi":"10.32347/2409-2606.2019.30.29-33","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.29-33","url":null,"abstract":"At present, the use of different candles in the house has increased significantly to create a pleasant environment. At the same time, from an energy point of view, it is an attempt to reconstruct and create buildings as densely as possible to provide the least heat loss due to uncontrolled ventilation. Is it safe to use a home candle in this regard? The article is a brief documented history of candles, the principle of combustion and the effect of burning candles on the internal environment. The purpose of the article is to indicate how the burning of candles affects the need for ventilation of the room. Experimental measurements were made to achieve this aim Measuring of the production of carbon dioxide at flames of candles is the subject of this study. Experimental investigations have been carried out and the results of research are presented in figures and analytic equations. Measurement took place in three stages with order to some methods There have been measured both internal and external air parameters that are documented in figures From the given data, it can be argued that the greatest increase in the concentration of carbon dioxide occurred during the second stage of measurement, when the person was in the room when the candle burned. Effect of candles burning on the environment is presented. For example, some candles emit dangerous substances for human health and are pollutants in the air. Burning of candles process has been analyzed and a chemical scheme of a burning candle is presented. From measured and calculated data it can be argued that the flame of candles during an experimental measurement causes an increase in the concentration of carbon dioxide by 76 %, as in the case of human being.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90497734","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":"Design Specificity of Direct Light LED Fixtures","authors":"L. Koval","doi":"10.32347/2409-2606.2019.30.34-42","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.34-42","url":null,"abstract":"","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84770510","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":"A Method for the Analysis of Isotherms, Surface Fractal Dimension and Dynamic Chaos of Moisture Exchange in Colloidal Capillary-Porous Museum Exhibits at Changeable Microclimate Conditions","authors":"Yurii Chovniuk, Volodymyr Dovhaliuk, V. Kravchuk","doi":"10.32347/2409-2606.2019.30.6-19","DOIUrl":"https://doi.org/10.32347/2409-2606.2019.30.6-19","url":null,"abstract":"","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88005910","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}