Constant heat characterisation and geometrical optimisation of thermoelectric generators

A regenerative concept for thermoelectric power generation

https://nottingham-repository.worktribe.com/preview/859497/ISHT9-revised%20final.pdf

A comprehensive study on a novel concentric cylindrical thermoelectric power generation system

Majority of the vehicles commercially available today and on the roads today use internal combustion engines (ICE) for the power source. Such engines utilize only small share of the fuel primary energy converted to kinetic energy, however majority of fuel primary energy is wasted while dissipated in the ambient air as waste heat or as hot exhaust gas. A remarkable potential for improving the efficiency of the ICE systems lies in the recovery of the energy wasted today. This paper presents an overview of the state of the art of current research of exhaust waste heat recovery systems utilizing thermoelectric generators (TEGs). Such systems provide the direct heat-to-electric energy conversion and allow building the exhaust energy recovery systems without adding moving parts to the vehicles. The review will present the overview related particularly to vehicle engines exhaust energy recovery systems, introducing the key parameters, components and factors that determine the performance of such systems.

Automotive waste heat harvesting for electricity generation using thermoelectric systems — An overview

https://escholarship.org/content/qt98c3p6nx/qt98c3p6nx.pdf?t=ozm9c6

A temperature-variant method for performance modeling and economic analysis of thermoelectric generators: Linking material properties to real-world conditions

A numerical model has been developed to simulate coupled thermal and electrical energy transfer processes in a thermoelectric generator (TEG) designed for automotive waste heat recovery systems. This model is capable of computing the overall heat transferred, the electrical power output, and the associated pressure drop for given inlet conditions of the exhaust gas and the available TEG volume. Multiple-filled skutterudites and conventional bismuth telluride are considered for thermoelectric modules (TEMs) for conversion of waste heat from exhaust into usable electrical power. Heat transfer between the hot exhaust gas and the hot side of the TEMs is enhanced with the use of a plate-fin heat exchanger integrated within the TEG and using liquid coolant on the cold side. The TEG is discretized along the exhaust flow direction using a finite-volume method. Each control volume is modeled as a thermal resistance network which consists of integrated submodels including a heat exchanger and a thermoelectric device. The pressure drop along the TEG is calculated using standard pressure loss correlations and viscous drag models. The model is validated to preserve global energy balances and is applied to analyze a prototype TEG with data provided by General Motors. Detailed results are provided for local and global heat transfer and electric power generation. In the companion paper, the model is then applied to consider various TEG topologies using skutterudite and bismuth telluride TEMs.

Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part I: Numerical Modeling and Baseline Model Analysis

The performance of heat transfer is one of the most important research areas in the field of thermal engineering. There are a large number of refrigerants, which are used to transfer heat from low temperature reservoir to high temperature reservoir by using vapour compression refrigeration system. There are various obstacles faced in working of different refrigerants due to their environmental impact (R11, R12), toxicity (NH3), flammability (HC) and high pressure (CO2); which makes them more hazardous than other working fluids according to safety and environmental issues. Researchers observed the performance of different environmental friendly refrigerants and their mixtures in different proportions. They also observed the effect of working parameters like dimensions of capillary tube, working pressures and working temperatures, which affect the coefficient of performance (COP) of vapour compression refrigeration system. From the literature there seems to be need of new efficient, minimum global warming potential (GWP), minimum ozone depletion potential (ODP) and environmental friendly refrigerants.

Evaluation of Vapour Compression Refrigeration System Using Different Refrigerants-A Review

Gasoline turbine development is normally pushing forward and forlarger talent extra smoking turbine gulf temperatureis needed. Hence of that, one of the crucial biggestconfiguration problems is to detect amazing procedures tocool the hot constituents in the gasoline turbine. The errand was tocreate and check new option cooling and mounting ideasfor a move channel in turbine, SGT-750. Transfer pipe is ahot part and have the undertaking to direct the sizzling gasolinefrom the burning chamber to the turbine gulf in a gasolineturbine.The transfer pipe of at present is cooled via a relative massivemeasure of compressor air which will have to be diminished ifthere must be an occurrence of a force overhaul. Thepresent mounting association obliges three burningchambers to be uprooted for one move conduit preservation,which is tedious. A writing study and a statisticalsurveying including patent hunts were once made to get aevaluation of preparations utilized today. Thought was thenproduced from potential/approach tree in conjunction withmorphology networks. This was once remoted in two branches,one for cooling and one for mounting and fixing. Thestrategies were assessed with Go-/no make a go at screening,datum strategy and weighted ambitions method. Furtheradvancement and mix of the recommendations brought about exceptionalproposal suggestions which will ease and abbreviate theprotection and diminish the cooling air utilization with keptmaterial temperature.

/pdf/alternative-cooling-and-mounting-theories-for-transition-1mwtoiwan1.pdf

Alternative Cooling and Mounting Theories for Transition Duct inIndustrial Gas Turbines

Aerodynamic drag and heating is the valuable in the thermal steadiness of hypersonic automobiles at various speeds. The contemporary tendencies in the design of nose cone constitution needs an amazing Thermal Protection System (TPS) meets the need of the gap study technology. In this study a natural nose cone with specific ultra-high Temperature (UHT) ceramic composite TPS materials like Hafnium diboride (HfB2) and zirconium diboride (ZrB2) is analyzed and when compared for its strong protection towards switch of warmness into the constitution. A naval model is designed for from the standards of blunt nose cone and analyzed with the commercial program. A normal quad 4 node aspects is adopted to participate in thermal evaluation in ANSYS program and the simulated outcomes are validated with numerical solutions. Present ablative materials like SLA-561V, SIRCA and AVCOAT are having the warmth flux levels up to an110W/cm 2 and temperatures ranging as much as 2000˚C and want of recent substances and its reliability are focused in this research.

An Investigation of blunt nose cone withUltra high temperature ceramicComposite TPS materials

Centrifugal pumps are used to transport liquids/fluids by the conversion of the rotational kinetic energy to the hydro dynamics energy of the liquid flow. The rotational energy typically comes from an engine or electric motor or turbine. In the typical simple case, the fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser or volute chamber (casing), from where it exits. The Contemporary impellers blades in Centrifugal pumps are used in industrial applications are made up of Aluminium or Steel. It is proposed to design a centrifugal pump using Computer Aided Design (CAD) software with various metal alloys and NonMetallic composite materials, analyze its strength and deformation using simulation software. In order to evaluate the effectiveness of Metal Alloys and NonMetallic composites. The present work aim is to change the material and performing the different analysis like Static, Dynamic, Analysis to find the best material to decrease the weight and increase its efficiency by using the software SOLID WORKS (2014 Premium Version). This also involves the method of manufacturing process to realize the Blower using Non-Metallic composite material.

G. Naresh Babu

Papers

Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part I: Numerical Modeling and Baseline Model Analysis

Evaluation of Vapour Compression Refrigeration System Using Different Refrigerants-A Review

Alternative Cooling and Mounting Theories for Transition Duct inIndustrial Gas Turbines

An Investigation of blunt nose cone withUltra high temperature ceramicComposite TPS materials

Design and Simulation of Centrifugal Pump Using Composite Materials