An Engineering Evaluation of Energy Conversion Devices

Lauck, Francis W.; Uyehara, O. A.; Myers, P. S.

doi:10.4271/630446

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…This means that the "Carnot limitation" is not applicable. In fact, the IC engine may potentially approach 100% efficiency and still be consistent with the first and second laws of thermody namics [1][2][3]. This subsection will summarize some of the previ ous work that has examined this possibility.…”

Section: Brief Overview Of Engine Thermodynamicsmentioning

confidence: 98%

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Thermodynamic Considerations for Advanced, High Efficiency IC Engines

Caton

2014

Journal of Engineering for Gas Turbines and Power

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College Station, TX 7 7 84 3-3 12 3 e-m ail: jcaton@ tamu.edu Thermodynamic Considerations for Advanced, High Efficiency IC EnginesThermodynamics is the key discipline for determining and quantifying the elements of advanced engine designs, which lead to high efficiency. In spite of its importance, ther modynamics is often not given full consideration in understanding engine operation for high efficiency. By fully utilizing the first and second laws of thermodynamics, detailed understanding of the engine features that provide for high efficiency may be determined. Of all the possible features that contribute to high efficiency, the results of this study show that highly diluted engines with high compression ratios provide the greatest impact for high efficiencies. Other important improvements, which increase the efficiency include reduced heat losses, optimal combustion phasing, reduced friction, and reduced combus tion duration. Thermodynamic quantification of these concepts is provided. For one com parison, the brake thermal efficiency increased from about 34% for the conventional engine to about 48% for the engine with one set of the above features. One aspect that contributes to these improvements is the importance of the increase of the ratio of specific heats. In addition, these design features often result in low emissions due to the low com bustion temperatures.

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Section: Brief Overview Of Engine Thermodynamicsmentioning

confidence: 98%

“…The complete calculation is repeated until the final values agree with the initial values. Depending on the initial values and the specified tolerance, this procedure usually finds convergence within about three [3] com plete cycles.…”

Section: Energy Equationsmentioning

confidence: 99%

Thermodynamic Considerations for Advanced, High Efficiency IC Engines

Caton

2014

Journal of Engineering for Gas Turbines and Power

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“…The thermoelectric effect is defined as the direct conversion of the difference in temperature into voltage and similarly conversion of voltage into temperature based on the Seebeck Effect. (Lauck, Uyehara, & Myers, 1963). Seebeck Effect was first introduced in 1821 and according to that if the two dissimilar metals are joint with each other at different temperature, there will be an electromotive forceand a resulting voltage between them.…”

Section: Thermoelectric Effectmentioning

confidence: 99%

“…The larger the temperature difference between the two metals the greater will be the value of electromotive motive force between them. (Lauck et al, 1963) The effect is reversible which means if there is a voltage between two joint dissimilar metals there is going to be a temperature difference between the two. This reverse effect was discovered in 1834 and is known as the Peltier effect.…”

Section: Thermoelectric Effectmentioning

confidence: 99%

Thermoelectric generators

Patel

Singh²

2021

OSJ

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As the world is changing and developing with every passing day, the requirements of power are also increasing. There is a shift in utilizing the electrical energy as much as possible and for this reason, many countries have already made policies for completely ruling out the machines which don’t run on electricity. Apart from electricity, there are other forms of energy that can be used to convert that form into a more desirable form. For example, in a plant where the smoke comes out of the chimneys or in a car, the smoke carries a large amount of thermal energy with it. This energy is nothing but a waste and reduction in the efficiency of the systems. If somehow, this energy could be recovered, the efficiency can be increased. Thermoelectric generators serve for this purpose. Thermos electric generators get the heat and using the principle of heat conduction and p and n type materials, the heat can be directly converted into the electricity. There are many materials available in the market for p and n type but in our case, we chose silicon germanium which is also one of the most commonly used. First of all, a single module of thermoelectric generator will be made using p and n type material, as well as using conductive material and some ceramic substance. Then, the entire assembly will be made and this assembly will be exported to Ansys where custom materials will be added and applied on to the geometry. After performing analysis on full model, a comparative study will be presented in which the effect of material of conductive plate on to the voltage difference will be studied

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“…A comprehensive assessment of combustion processes in a.wide variety of stratified charge engines, including a discussion of the advantages and d.isadvantages of lean charge engines, was presented by Newhall (25). A comparison of potential efficiencies of various prime movers for automobiles has been compiled by Lauck, et al (3) who' provided fundamental arguments for the intrinsic.…”

Section: Overview Of Progress In Engine Developmentmentioning

confidence: 99%