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.
Papers published on a yearly basis
Papers
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TL;DR: In this article, an ultrasonic emulsification method was applied to prepare two-phase water-in-oil (W/O) and three-phase oil-inwater-inoil (O/W)/O) emulsions.
95 citations
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TL;DR: In this article, a homogeneous charge compression ignition (HCCI) engine with efficient heat recovery can operate on a mixture of 35% ethanol and 65% water by volume while achieving a high brake thermal efficiency (38.7%) and very low NOx (1.6 ppm).
Abstract: Homogeneous charge compression ignition (HCCI) is a new engine technology with fundamental differences over conventional engines. HCCI engines are intrinsically fuel flexible and can run on low-grade fuels as long as the fuel can be heated to the point of ignition. In particular, HCCI engines can run on “wet ethanol:” ethanol-in-water mixtures with high concentration of water. Considering that much of the energy required for processing fermented ethanol is spent in distillation and dehydration, direct use of wet ethanol in HCCI engines considerably shifts the energy balance in favor of ethanol. The results of the paper show that a HCCI engine with efficient heat recovery can operate on a mixture of 35% ethanol and 65% water by volume while achieving a high brake thermal efficiency (38.7%) and very low NOx (1.6 ppm, clean enough to meet any existing or oncoming emissions standards). Direct utilization of ethanol at a 35% volume fraction reduces water separation cost to only 3% of the energy of ethanol and coproducts (versus 37% for producing pure ethanol) and improves the net energy gain from 21% to 55% of the energy of ethanol and coproducts. Wet ethanol utilization is a promising concept that merits more detailed analysis and experimental evaluation. DOI: 10.1115/1.2794768
95 citations
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TL;DR: In this paper, a detailed thermodynamic and efficiency analysis of a two-step solar thermochemical water splitting cycle for hydrogen production is presented. But, the analysis was performed using HSC Chemistry software and its thermodynamic database, and the results indicated that the higher values of cycle efficiency (41.17%) and solar-to-fuel energy conversion efficiency (49.61%) are achievable by operating this cycle at a thermal reduction temperature of 1780 K and water splitting temperature equal to 800 K with 50% heat recuperation.
95 citations
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TL;DR: In this paper, the authors focused on the optimum design and thermodynamic analysis of the gas turbine and organic Rankine cycle (ORC) combined cycle and found that the ORC combined cycle had better thermodynamic performance compared with the GT-Rankine combined cycle.
95 citations
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TL;DR: The effect of addition of jatropha biodiesel to mineral diesel on the performance and emission characteristics of a conventional c ompression ignition engine have been experimentally investigated and compared with simulated data using Diesel-RK software as discussed by the authors.
95 citations