Topic
Thermal efficiency
About: Thermal efficiency is a research topic. Over the lifetime, 20911 publications have been published within this topic receiving 302373 citations. The topic is also known as: thermodynamic efficiency & efficiency.
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145 citations
TL;DR: It is demonstrated that maximum power and maximum efficiency operating points are usually relatively close, with the associated implications for the selection of optimal heat engine operating conditions.
Abstract: Realistic upper bounds can be placed on the power and efficiency of real heat engines via a relatively simple analytic treatment of primary sources of irreversibility. Generalized curves for heat engine performance, their universal nature, and quantitative evaluation of upper bounds for power and efficiency are derived for several engine types, specifically: Brayton cycle (gas turbines), Rankine cycle (steam turbines), and cycles with sizable heat leaks, such as thermoelectric generators. The key irreversibility sources include fluid friction, the constraint of the equation of state of the engine’s working fluid, and heat leak. It is demonstrated that maximum power and maximum efficiency operating points are usually relatively close, with the associated implications for the selection of optimal heat engine operating conditions. The limitations of past analyses of endoreversible cycles as models for real heat engines will be discussed and the fortuitous nature of agreement between their predictions and actual heat engine performance will be explained.
145 citations
TL;DR: In this article, a dual-loop organic Rankine cycle (ORC) was used to harness the wasted heat from an internal combustion engine, and the performance of the combined engine-ORC system was evaluated.
145 citations
TL;DR: In this article, the authors proposed a combined thermal power and cooling cycle, which combines the Rankine and absorption refrigeration cycles, using a binary ammonia-water mixture as the working fluid.
145 citations
TL;DR: In this article, the performance, emission and combustion characteristics of direct injection (DI) diesel engine fuelled with EEFO and its blends were investigated. But, the results showed that diesel engine performance was not significantly worse than B20 compared to B20.
145 citations