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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Papers
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TL;DR: In this article, the effects of injection and ignition timings on performance and emissions from a high-compression direct-injection stratified charge spark-ignition methanol engine were investigated experimentally.
112 citations
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TL;DR: In this article, a metal PCM with refractory metallic shells was proposed, which can work at temperature up to 1000 degrees C. The latent heat density of as-prepared capsules is up to 75% of the theoretical value (about 71 J/g) at the melting temperature of 1077 degrees C and the thermal resistance of chromium-nickel layer is 8.27 x 10(-6) m(2) k/w.
112 citations
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05 Nov 1993TL;DR: In this paper, a hybrid combined cycle power plant including a solar central receiver for receiving solar radiation and converting it to thermal energy was proposed, which includes a molten salt heat transfer medium for transferring the thermal energy to an air heater.
Abstract: A hybrid combined cycle power plant including a solar central receiver for receiving solar radiation and converting it to thermal energy. The power plant includes a molten salt heat transfer medium for transferring the thermal energy to an air heater. The air heater uses the thermal energy to preheat the air from the compressor of the gas cycle. The exhaust gases from the gas cycle are directed to a steam turbine for additional energy production.
112 citations
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TL;DR: In this article, the photovoltaic panel (PVP) area is shown to be much smaller than that of the solar collector, and the performance of different panels in the hybrid PV-thermal system was investigated, in particular, those made of crystalline (c-) Si, α-Si and CuInSe2 as well as different materials and constructions for the thermal contact between the panel and the collector.
112 citations
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25 Oct 2010TL;DR: In this paper, the effect of cylinder-to-cylinder imbalances, heat rejection, and incylinder charge motion as well as the potential limitations imposed by real-world turbo-machinery were investigated on a 1.9-liter four-cylinder engine.
Abstract: In-cylinder fuel blending of gasoline/diesel fuel is investigated on a multi-cylinder light-duty diesel engine as a potential strategy to control in-cylinder fuel reactivity for improved efficiency and lowest possible emissions. This approach was developed and demonstrated at the University of Wisconsin through modeling and single-cylinder engine experiments. The objective of this study is to better understand the potential and challenges of this method on a multi-cylinder engine. More specifically, the effect of cylinder-to-cylinder imbalances, heat rejection, and in-cylinder charge motion as well as the potential limitations imposed by real-world turbo-machinery were investigated on a 1.9-liter four-cylinder engine. This investigation focused on one engine condition, 2300 rpm, 4.2 bar brake mean effective pressure (BMEP). Gasoline was introduced with a port-fuel-injection system. Parameter sweeps included gasoline-to-diesel fuel ratio, intake air mixture temperature, in-cylinder swirl number, and diesel start-of-injection phasing. In addition, engine parameters were trimmed for each cylinder to balance the combustion process for maximum efficiency and lowest emissions. An important observation was the strong influence of intake charge temperature on cylinder pressure rise rate. Experiments were able to show increased thermal efficiency along with dramatic decreases in oxides of nitrogen (NOX) and particulate matter (PM). However, indicated thermal efficiency for themore » multi-cylinder experiments were less than expected based on modeling and single-cylinder results. The lower indicated thermal efficiency is believed to be due increased heat transfer as compared to the model predictions and suggest a need for improved cylinder-to-cylinder control and increased heat transfer control.« less
112 citations