Thermoelectric generators (TEGs) often use plate-fin heat sinks as cold side exchangers under forced convection. The available net electrical power obtained from these TEGs corresponds to that generated (Seebeck effect) minus consumed (cooling fan). Generation and self-consumption have different trends a function of the air flow speed, so maximum is expected when varying cooling rate. Here, semi-analytical model was developed predict single TEG module with sink non-bypassed successfully...

A thermal analysis of an interior permanent magnet machine using a lumped parameter model is presented, with the objective to evaluate several rotor cooling techniques for electric vehicle applications which are needed in order achieve higher power densities. Two selected involve shaft by pumping liquid through channel and implementing rotating heat pipe. The third technique accomplished pointing jets towards hub rotor. implementation these newly modeled described. From temperature...

The increasing power density of electric machines for vehicles necessitates accurate thermal analysis in design and real-time condition monitoring through simulations with computation times not exceeding one minute. Existing models are either complex while requiring large or they fast but lack accuracy. To address these challenges, a novel hybrid modeling methodology is proposed, combining 3D lumped parameter networks resistances extracted from 2D finite element (FEM) to reduce demands...

Abstract Low-temperature district heating (LTDH) enables the use of various renewable energy sources, reduces heat losses and increases efficiency distribution network. LTDH is especially applicable in energy-efficient buildings as supply temperature for space can be reduced. However, urban areas consist energetically refurbished non-refurbished buildings. In these scenarios a network with central pump (HP) decentral booster units, such HP or electrical heater, solution. This study...

In this paper an advanced thermal lumped parameter model for a switched reluctance electric motor (SRM) is constructed, based on 2D finite element simulation of radial cross section the motor. When applying and combining cooling methods such as direct coil cooling, end winding (radial stretched) spray SRM, conventional models can no longer be used due to 3D complex temperature gradients in standard LP models, mostly one simple method implemented by which are also quite (1D or 2D). different...

This paper presents an advanced thermal lumped parameter model (LPM) for a switched reluctance motor which the accuracy of results is verified with 3D finite element (FE) simulation. An proposed, extracts 2D LPM from FE simulation and extends this into based on regular LP techniques. The assumptions simplifications in de are by comparing simulated average maximum component temperatures models. comparison shows deviation 0.2% (rotor) 0.1% (winding). It concluded that proposed efficient...

A measurement setup is designed and constructed to experimentally investigate the thermohydraulic performance of a novel direct rotor cooling method for an interior permanent magnet synchronous machine, where oil pumped through weight saving channels iron close magnets. The consist stationary assembly heat dissipated in aluminum sleeve surrounding outer surface. Measurements are performed different inlet temperatures, flow rates losses. It shown that tangential temperature variations can be...

Absorption heat pump (AHP) cycles provide opportunities to reduce the energy use of drying systems. However, different configurations can be conceived and results vary. In this work, data from an existing industrial convective dryer are used as input simulate cycles. Energy that is lost in exhaust partly recovered total demand. Energetic analyses done for three AHP cycles: type I, II double-lift cycle. The maximal relative saving compared original respective equal 20%, 11% 15%. With quotes...

This paper presents the modelling and validation of an advanced thermal lumped parameter (LP) model for a stator tooth switched reluctance motor (SRM) with dry lateral slot cooling method. Standard simple models electric motors can insufficiently predict temperature distribution within components motor. In standard LP models, only several nodes are used to each component, while more accurate needed effect different methods on performance without need experiments. A fully 3D finite element...

In general, most heat losses in industrial dryers arise due to the discharge of humid air. Using pump drying systems, from exhaust air can be recovered, thus improving energy efficiency substantially. this study, performance integration a blood dryer was examined. Computer simulation models original high-temperature (180°C) and proposed system with auxiliary heating were developed. Different systems working fluids investigated determine best performing system. case, it found that an R245fa...

This paper considers the steel reheating process, in which cold slabs are reheated to a temperature suitable for hot rolling operations. Temperature uniformity within slab is very important during reheating, as non-uniformities often lead quality concerns later stages of production process. Attaining quite challenging, therefore, thorough understanding process becomes important. Due extreme conditions inside furnace, numerical tools like computational fluid dynamics necessary such...

A novel direct rotor cooling method for electric machines is proposed and the performance evaluated based on a thermal zonal model that validated with measurements heater setup. The trend of increasing power density urges need high methods. needed to assess these methods certain geometry optimize design. previously developed an interior permanent magnet synchronous machine extended setup different oil inlet temperatures (40 80°C), flow rates (0.5 10 l/min) heating powers (261 873W). With...

An experimental setup was designed to test the influence of several design parameters on thermal and hydraulic performance a liquid cooled cold plate with serpentine channels, improve validate modelling plates. Heaters are installed which controlled deliver heat dissipation rates 200 W 1200 corresponding flux densities 4 kW/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> 24 . A 50%–50% mixture water ethylene glycol is used as coolant....

After casting steel slabs are reheated in a reheat furnace to temperatures the range 1200-1250 °C order be suitable for rolling. The high energy requirements and importance of reheating quality control motivation behind numerically modeling furnace. Computational fluid dynamics allows us understand fundamental physics with great detail. It is however unclear how assumptions such models influence results simulations. In this work steady-state model was analyzed, it found that chosen slab...

Abstract The increasing power density of electric machines for vehicles necessitates accurate thermal analysis in design through simulations with computation times not exceeding one minute. Existing models are either and complex while requiring large or they fast but lack accuracy. To address these challenges, a novel hybrid modelling methodology is proposed, combining 3D lumped parameter networks resistances extracted from 2D finite element (FEM) to reduce demands preserving Verification...

Abstract The electric drivetrain of an vehicle typically has two fluid circuits: oil circuit for lubrication and a water-glycol cooling. Eliminating the can result in more compact lighter drivetrain. However, this requires components to be cooled with as coolant, which inferior heat transfer properties compared mixtures. This is particularly challenging power modules electronics unit, exhibit some highest fluxes study focusses on design optimization novel type sink laminar flows baffles...