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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TL;DR: In this article, the authors measured the performance of different biodiesel fuel blends and found that B50 gives the highest peak pressure at 1750-rpm, while B10 gives the higher peak pressure in low speed at low speed, 1000-rpm.
Abstract: Jatropha-curcas as a non-edible methyl ester biodiesel fuel source is used to run single cylinder, variable compression ratio, and four-stroke diesel engine. Combustion characteristics as well as engine performance are measured for different biodiesel – diesel blends. It has been shown that B50 (50% of biodiesel in a mixture of biodiesel and diesel fuel) gives the highest peak pressure at 1750 rpm, while B10 gives the highest peak pressure at low speed, 1000 rpm. B50 shows upper brake torque, while B0 shows the highest volumetric efficiency. B50 shows also, the highest BSFC by about (12.5–25%) compared with diesel fuel. B10 gives the highest brake thermal efficiency. B50 to B30 show nearly the lowest CO concentration, besides CO concentration is the highest at both idle and high running speeds. Exhaust temperature and NO x are maximum for B50. Delay period is measured and correlated for different blends. Modified empirical formulae are obtained for each blend. The delay period is found to be decreased with the increase of cylinder pressure, temperature and equivalence ratio.
136 citations
TL;DR: In this article, the performance of a hybrid photovoltaic-thermal solar collector with phase change material (PCM) has been evaluated in terms of electrical and thermal performance.
136 citations
TL;DR: In this paper, an annular porous structure is installed inside the absorber tube to improve heat transfer and the effects of simultaneous utilization of porous structure and nanoparticle addition on heat transfer, pressure drop, and thermal efficiency of the receiver are investigated for different values of Reynolds number, volume fraction of nanoparticles, inlet temperature and Darcy number of the porous region.
136 citations
TL;DR: In this article, the authors investigated the auto-ignition, combustion, and emission characteristics of homogeneous charge compression ignition (HCCI) combustion engines fuelled with n-heptane and ethanol/n-heptonane blend fuels.
136 citations
TL;DR: In this paper, a novel ammonia-water cycle is proposed for the cogeneration of power and refrigeration, where a splitting /absorption unit is introduced and integrated with an ammonia Rankine cycle and an ammonia refrigeration cycle.
136 citations