scholarly journals THERMAL WORK OF CHAMBER FURNACE FOR HEATING FOR HARDENING OF THIN STEEL SHEET

2019 ◽  
Vol 62 (10) ◽  
pp. 803-809
Author(s):  
M. D. Kazyaev ◽  
D. M. Kazyaev ◽  
E. V. Kiselev ◽  
A. M. Vokhmyakov ◽  
D. I. Spitchenko
Keyword(s):  
Thermal Performance ◽  
Thin Sheet ◽  
Steel Production ◽  
Heating System ◽  
Limited Space ◽  
Heating Furnaces ◽  
Working Space ◽  
Specific Loading ◽  
Thermal Work ◽  
Design And Construction

Increasing performance of steelmaking units is possible with  changing methods of steel production. Such variances entail serio us  changes in the subsequent redistributions: in metals processing by  pressure and in thermal treatment of finished metal products. It is  known that these two metallurgical processes are equipped with a  large number of heating and thermal furnaces, and their thermal work  does not always meet increased requirements for products quali ty.  Issues of improving thermal performance of furnaces are also relevant in mechanical engineering. High technological requirements  are associa ted with very strict environmental ones. Therefore, a new  concept is needed for the design and construction of modern highly  automated industrial heating furnaces. In order to improve the design  and technical and economic indicators, technical obsolescence and  the construction of new industrial furnaces are carried out. In design  and construction of furnaces, fuel-burning devices of new designs  and modern materials are used. In turn, this necessitates the use of  new approaches to working space and heating system design of the  furnace, taking into account arrangement of heated products charge.  Such events are carried out, as a rule, in operating workshops, that  causes certain difficulties due to limited space provided for placement of new furnaces and equipment for their operation and maintenance. A complex study was made of the design and thermal performance of a block of three chamber thermal furnaces. They were built  in a limited space of the workshop with specific loading and delivery  of heated thin sheet.

scholarly journals Evolution of the Numerical Model Describing the Distribution of Non-Metallic Inclusions in the Tundish

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2229
Author(s):  
Tomasz Merder ◽  
Jacek Pieprzyca ◽  
Marek Warzecha ◽  
Piotr Warzecha ◽  
Artur Hutny
Keyword(s):  
Numerical Model ◽  
Liquid Steel ◽  
Nonmetallic Inclusions ◽  
Steel Production ◽  
Cfd Modeling ◽  
Water Model ◽  
Working Space ◽  
Production Stages ◽  
Steel Flow ◽  
Flow Controllers

Continuous casting is one of the steel production stages, during which the improvement in the metallurgical purity of steel can be additionally affected by removing nonmetallic inclusions (NMIs). This can be achieved by means of various types of flow controllers, installed in the working space of the tundish. The change in the steel flow structure, caused by those flow controllers, should lead to an intensification of NMIs removal from the liquid metal to the slag. Therefore, it is crucial to understand the behavior of nonmetallic inclusions during the flow of liquid steel through the tundish, and particularly during their distribution. The presented paper reports the results of the modeling studies of NMI distribution in liquid steel, flowing through the tundish. CFD modeling methods—using different models and computation variants—were employed in the study. The obtained CFD results were compared with the results of laboratory tests (using a tundish water model). The results of the performed investigations allow us to compare both methods of modeling; the investigated phenomena were microparticle distribution and mass microparticle concentration in the model fluid. The validation of the CFD results verified the analyzed computation variants. The aim of the research was to determine which numerical model is the best for describing the studied phenomenon. This will be used as the first phase of a larger research program which will provide for a comprehensive study of the distribution of NMIs flowing through tundish steel.

scholarly journals Experimental Evaluation of Nano-Enhanced Phase Change Materials in a Finned Storage Unit

2020 ◽  
Vol 10 (3) ◽  
pp. 5814-5818
Author(s):  
M. A. Aichouni ◽  
N. F. Alshammari ◽  
N. Ben Khedher ◽  
M. Aichouni
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Performance ◽  
Phase Change Materials ◽  
Performance Enhancement ◽  
Renewable Energy Sources ◽  
Heating System ◽  
Al2o3 Nanoparticles ◽  
Storage Unit ◽  
Experimental Apparatus

The intermittent nature of renewable energy sources such as solar and wind necessitates integration with energy-storage units to enable realistic applications. In this study, thermal performance enhancement of the finned Cylindrical Thermal Energy Storage (C-TES) with nano-enhanced Phase Change Material (PCM) integrated with the water heating system under Storage, Charging and Discharging (SCD) conditions were investigated experimentally. The effects of the addition of copper oxide (CuO) and aluminum oxide (Al2O3) nanoparticles in PCM on thermal conductivity, specific heat, and on charging and discharging performance rates were theoretically and experimentally investigated and studied in detail. The experimental apparatus utilized paraffin wax as PCM, which was filled in Finned C-TES to conduct the experiments. The experimental results showed a positive improvement compared with the non-nano additive PCM. The significance and originality of this project lies within the evaluation and identification of preferable metal-oxides with higher potential for improving thermal performance.

scholarly journals Development of a hybrid solar cascade heat pump heating system

2021 ◽  
Author(s):  
Jamie Fine
Keyword(s):  
Case Studies ◽  
Co2 Emissions ◽  
Heat Pump ◽  
Thermal Performance ◽  
Heating System ◽  
Solar Heating ◽  
Hot Water ◽  
Solar Irradiation ◽  
Solar Still ◽  
Evacuated Tube

Society’s use of fossil fuels has led to increasingly high levels of CO2 in the atmosphere. These levels have been linked to global average temperature rises, and increases in the severity and frequency of major weather events. To combat these effects, nations around the world have committed to reducing their CO2 emissions, and transition to renewable energy. This thesis focuses on the development of a novel solar heating system, which combines a hybrid solar panel and cascade heat pump. The thesis begins by presenting a high-level literature review of solar and heat pump technologies, followed by the initial design development of the system. Two design iterations are presented, illustrating that the final design was selected because it exhibits improved peak heat output, and reduced sensitivity to panel temperature. Next, a manuscript-based chapter is presented that focuses on utilizing the proposed solar heating system for water distillation. Case studies are presented that compare the performance of the proposed system with a solar still at four different locations. The final conclusion from these studies is that using the proposed system offers area-based performance improvements of 780% compared to a basic solar still. A second manuscript-based study is then presented, which focuses on utilizing the proposed solar heating system for domestic hot water production. Additional case studies are detailed that compare the proposed system to an evacuated tube design, and a single heat pump. The conclusions from these studies are that the proposed system exceeds the performance of the evacuated tube system by up to 64%, and that the proposed system is most beneficial during seasons with higher average dry-bulb temperatures, and increased solar irradiation. A final manuscript-based study is then presented, which focuses on a methodology for improving alternate mode thermal performance estimates for hybrid solar panels. The conclusion from this study is that the proposed methodology can successfully estimate thermal performance within 5% of actual values. Each of these studies contributes to the project goal of developing a novel solar energy heating system, which can be further developed to reduce global CO2 emissions, and reduce the effects of climate change.

scholarly journals Development of a hybrid solar cascade heat pump heating system

2021 ◽  
Author(s):  
Jamie Fine
Keyword(s):  
Case Studies ◽  
Co2 Emissions ◽  
Heat Pump ◽  
Thermal Performance ◽  
Heating System ◽  
Solar Heating ◽  
Hot Water ◽  
Solar Irradiation ◽  
Solar Still ◽  
Evacuated Tube

Society’s use of fossil fuels has led to increasingly high levels of CO2 in the atmosphere. These levels have been linked to global average temperature rises, and increases in the severity and frequency of major weather events. To combat these effects, nations around the world have committed to reducing their CO2 emissions, and transition to renewable energy. This thesis focuses on the development of a novel solar heating system, which combines a hybrid solar panel and cascade heat pump. The thesis begins by presenting a high-level literature review of solar and heat pump technologies, followed by the initial design development of the system. Two design iterations are presented, illustrating that the final design was selected because it exhibits improved peak heat output, and reduced sensitivity to panel temperature. Next, a manuscript-based chapter is presented that focuses on utilizing the proposed solar heating system for water distillation. Case studies are presented that compare the performance of the proposed system with a solar still at four different locations. The final conclusion from these studies is that using the proposed system offers area-based performance improvements of 780% compared to a basic solar still. A second manuscript-based study is then presented, which focuses on utilizing the proposed solar heating system for domestic hot water production. Additional case studies are detailed that compare the proposed system to an evacuated tube design, and a single heat pump. The conclusions from these studies are that the proposed system exceeds the performance of the evacuated tube system by up to 64%, and that the proposed system is most beneficial during seasons with higher average dry-bulb temperatures, and increased solar irradiation. A final manuscript-based study is then presented, which focuses on a methodology for improving alternate mode thermal performance estimates for hybrid solar panels. The conclusion from this study is that the proposed methodology can successfully estimate thermal performance within 5% of actual values. Each of these studies contributes to the project goal of developing a novel solar energy heating system, which can be further developed to reduce global CO2 emissions, and reduce the effects of climate change.

Effect of Plant in Two Atrium Building Comfort: Report on Two Field-Monitored Case Studies

2011 ◽  
Vol 110-116 ◽  
pp. 1958-1962
Author(s):  
Marziyeh Kazemzadeh ◽  
Mansureh Tahbaz
Keyword(s):  
Relative Humidity ◽  
Case Studies ◽  
Thermal Performance ◽  
Weather Conditions ◽  
Heating System ◽  
Measuring Period ◽  
Total Temperature

This paper present the field-measured thermal performance of two atrium building in a clinic center located in Kerman, where winter is cold and dry. The case studies are an enclosed atrium space. The atriums have open corridors at each storey connecting them to adjacent space. The site measurement and monitoring work were carried out for one day covering clear day in November 2010. The weather conditions during the day measuring period were stable and heating system was off. This study will investigated about different temperature of atrium levels with plant and without plant. This study has shown that in cold and clear winter day, when average of external relative humidity in this day was around 9%,in the atrium relative humidity changed between 10%- 22% and total temperature in atrium level were changed between 18'C-28'C. whilst in the atrium without plant this range were between 3%-23% and 15'C-35'C respectively.

Optimization of thermal performance in a Chinese traditional heating system – Burning cave

2014 ◽  
Vol 68 ◽  
pp. 423-431 ◽  
Author(s):  
Xueyan Zhang ◽  
Bin Chen ◽  
Joe R. Zhao ◽  
Xiang Li ◽  
Sen Liu ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Heating System
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