MODELLING AND OPTIMIZATION OF STATIONARY PROCESS OF INDIRECT INDUCTION LIQUID HEATING

2011 ◽  
Vol 1 (2) ◽  
pp. 128-131 ◽  
Author(s):  
V. A DANILUShKIN ◽  
P. I RUBAN ◽  
A. Yu TAYMOLKIN
Keyword(s):  
Induction Heating ◽  
Power Distribution ◽  
Energy Savings ◽  
Continuous Optimization ◽  
Internal Heat ◽  
Step Function ◽  
Maximum Speed ◽  
Outlet Temperature ◽  
Heat Sources ◽  
Viscous Oil

The questions of mathematical modelling of indirect induction heating viscous oil in heaters and continuous optimization of the power distribution of internal heat sources on the criterion of maximum speed are analysed. It is similar to minimizing the length of the heater for the steady-state regimes of heating. The specificity of the heating of viscous fluids in indirect induction heating consists in the uneven distribution of liquid flow velocity in the cross section. proposed quasi-optimal algorithms for power distribution along the length of the heater in the form of a step function provide energy savings for heating when the technological demands of fidelity to the outlet temperature of the heater.

scholarly journals OPTIMIZATION OF STATIONARY AND TRANSITIONAL OPERATING MODES OF THE ELECTRICAL COMPLEX IN METAL PROCESSING LINE

2021 ◽  
Vol 11 (3) ◽  
pp. 157-167
Author(s):  
Aleksandr I. DANILUSHKIN ◽  
Vasilij A. DANILUSHKIN
Keyword(s):  
Induction Heating ◽  
Power Distribution ◽  
Internal Heat ◽  
Heating System ◽  
Function Optimization ◽  
Nonlinear Dependence ◽  
Control Algorithms ◽  
Heating Unit ◽  
Induction Heater ◽  
Heater Length

In the electrical complex “induction heater - deforming equipment”, the limiting performance of the complex is the induction heating unit. In this regard, an important task of increasing the effi ciency of the processing complex is to optimize both the design and operating parameters of the induction heating unit. It is shown that the main design parameter infl uencing the energy characteristics of the complex is the length of the heating system. When optimizing the total length of the heater, an iterative model of the process of induction heating of ferromagnetic billets is used. The power distribution algorithm along the length of a two-section heater is a piecewise continuous function. Optimization of the heater length according to the proposed method made it possible to reduce the heater length from 2.8 m to 2.1 m, i.e. by 25%. To search for eff ective control algorithms for non-stationary modes, a refi ned electrothermal model is proposed in the work. It takes into account the nonlinear dependence of the distribution of the power of the sources of internal heat release on the temperature distribution in the metal of the workpieces along the radial and axial coordinates. The problem of fi nding the optimal control of transient modes of a two-section induction heater of methodical action is formulated and solved. The results obtained provide a minimum of energy consumption for heating billets in transient modes under conditions of technological and energy constraints. Variants of starting the heater at various initial temperature states of the load are considered. The results of a comparative analysis of the eff ectiveness of the obtained control algorithms are presented. The structure of the power supply and control system of the induction heating complex is proposed.

Effect of Nature Convection on Heat Transfer in the Liquid LiPb Blanket

2008 ◽  
Author(s):  
Hongyan Wang ◽  
Xidong Zhang
Keyword(s):  
Heat Transfer ◽  
Cross Flow ◽  
Internal Heat ◽  
Mhd Flow ◽  
Outlet Temperature ◽  
Heat Sources ◽  
Material Technology ◽  
Volumetric Heating ◽  
Flow And Heat Transfer ◽  
Internal Heat Sources

In some liquid blankets (or liquid blanket module) of fusion reactor, the liquid metal, i.e. LiPb flow, as only tritium breeder is characterized by lower outlet temperature and slower flow velocity that allows the utilization of relatively mature material technology [1–2]. The magnetohydrodynamic (MHD) flow and heat transfer become very complex resulting from the differential heating of walls of the channels, especially adjacent to the First Wall (FW), and internal heat sources inside of the liquid LiPb. The nature convection of the liquid LiPb, due to thermal diffusion, in the poloidal channel adjacent to the FW in the presence of the strong magnetic field of the blanket has been considered and studied. The temperature distribution is changed and there is a strong thermal coupling, modifying importantly the magnitude of the flow. The effect of the buoyancy on pressure driven duct flows has been investigated. The buoyant convection was found to be sufficiently strong to impose its flow pattern on the cross flow in the region of intense volumetric heating.

Development of Energy Saving Technologies for Steel Wire Heat Treatment

2020 ◽  
Vol 299 ◽  
pp. 687-692
Author(s):  
Inna I. Barankova ◽  
Uliana V. Mikhailova ◽  
Lyudmila I. Antropova
Keyword(s):  
Heat Treatment ◽  
Energy Saving ◽  
Induction Heating ◽  
Power Distribution ◽  
Steel Wire ◽  
Internal Heat ◽  
Complex Nature ◽  
Technological Problem ◽  
Induction Method ◽  
International Trends

This article presents the development of energy-saving induction heating technology to accelerate significantly the process of heat treatment of steel wire. The analysis of international trends and prospects of the use of induction heating shows a steady expansion of the applied induction technologies in metallurgy. The article considers the advantages of induction heating in comparison with other competitive technologies. Heat treatment in electro-technical induction units is determined by the interrelated electrical and thermal processes in them, the complex nature of the distribution of internal heat sources, the dependence of the nature of the power distribution of the induction unit on the temperature of the products processed. The features of the applicated in the induction method of heating in the hardware industry for objects previously unused: such as coils of wire and riots of calibrated steel. The results of the study show the influence of the induction method of heating on temperature-time factors to the formation of the structure, to increase the uniformity of heating and the quality of heat treatment of steel wire, calibrated steel in riots, taking into account the technological problem. The authors give the assessment of the effectiveness of medium and high-frequency induction heating of steel wire of various diameters. The evaluation of the increase in the efficiency of an induction heating unit with the simultaneous heat treatment of several filaments of steel wire of the same diameter, combined into a bundle, was made.

Improving Sustainability of Housing in Ghana through Energy Efficient Climate Control Strategies

2012 ◽  
Vol 608-609 ◽  
pp. 1698-1704
Author(s):  
Abdul Manan Dauda ◽  
Hui Gao
Keyword(s):  
Natural Ventilation ◽  
Energy Savings ◽  
Control Strategies ◽  
Internal Heat ◽  
Climate Control ◽  
Housing Design ◽  
Artificial Lighting ◽  
Testing Procedures ◽  
Mass Housing ◽  
Design Changes

This paper aims at explaining testing procedures used to evaluate the potential of natural ventilation and daylighting applications to passive design of housing in Ghana. The objectives of research were to reduce energy costs and increase the sustainability of housing. From the results of these experiments actual and potential designs are illustrated and discussed. Mass housing results in multi-storey buildings which require substantial artificial lighting and ventilation. Also, with the increasing usage of glass for windows and doors in Ghana, even the shaded depths of buildings require additional daylight usually resulting in more energy consumption. By supplementing the internal lighting levels with daylight, reducing the internal heat load by shading windows to direct radiation and the utilization of natural ventilation over air conditioning where possible, significant energy savings are could be achieved. The research proposes mass housing design changes such as: delivering daylight above the suspended ceiling into the depths of the building by horizontal light pipes and natural ventilation, utilizing stack effect and wind siphonage, etc.

scholarly journals A Computer Vision-Based Occupancy and Equipment Usage Detection Approach for Reducing Building Energy Demand

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 156
Author(s):  
Paige Wenbin Tien ◽  
Shuangyu Wei ◽  
John Calautit
Keyword(s):  
Deep Learning ◽  
Real Time ◽  
Energy Demand ◽  
Energy Savings ◽  
Internal Heat ◽  
Electrical Equipment ◽  
Building Energy ◽  
Hvac Systems ◽  
Equipment Usage

Because of extensive variations in occupancy patterns around office space environments and their use of electrical equipment, accurate occupants’ behaviour detection is valuable for reducing the building energy demand and carbon emissions. Using the collected occupancy information, building energy management system can automatically adjust the operation of heating, ventilation and air-conditioning (HVAC) systems to meet the actual demands in different conditioned spaces in real-time. Existing and commonly used ‘fixed’ schedules for HVAC systems are not sufficient and cannot adjust based on the dynamic changes in building environments. This study proposes a vision-based occupancy and equipment usage detection method based on deep learning for demand-driven control systems. A model based on region-based convolutional neural network (R-CNN) was developed, trained and deployed to a camera for real-time detection of occupancy activities and equipment usage. Experiments tests within a case study office room suggested an overall accuracy of 97.32% and 80.80%. In order to predict the energy savings that can be attained using the proposed approach, the case study building was simulated. The simulation results revealed that the heat gains could be over or under predicted when using static or fixed profiles. Based on the set conditions, the equipment and occupancy gains were 65.75% and 32.74% lower when using the deep learning approach. Overall, the study showed the capabilities of the proposed approach in detecting and recognising multiple occupants’ activities and equipment usage and providing an alternative to estimate the internal heat emissions.

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