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, a model of a two-stage semiconductor thermoelectric-generator with external heat-transfer is built, and performance of the generator, assuming Newton's heat transfer law applies, is analyzed using a combination of finite-time thermodynamics and non-equilibrium thermodynamics.
143 citations
TL;DR: A thermal, mechanical and hydrodynamic analysis of these receivers has been developed in this article, assuming constant heat flux in each axial discretized section of the tube wall, but considering circumferential temperature variations in the perimeter of the tubes caused by the difference between the heat flux received by the front part of tubes and by the rear part.
143 citations
TL;DR: In this paper, the authors investigated a Kalina cycle using low-temperature heat sources to produce power, where the main heat source of the cycle is provided from flat solar collectors and an external heat source is connected to the cycle.
143 citations
TL;DR: In this article, experiments with two biomass pyrolysis oils and No. 2 diesel fuel were performed in a direct injection diesel engine and it was found that while the indicated thermal efficiency of both bio-oils equaled that of the diesel fuel, they exhibited excessive ignition delays and required a moderate degree of combustion air preheating to ignite reliably.
Abstract: To investigate their ignition delay and combustion behavior, experiments with two biomass pyrolysis oils and No. 2 diesel fuel were performed in a direct injection diesel engine. It was found that while the indicated thermal efficiency of both pyrolysis oils equaled that of the diesel fuel, they exhibited excessive ignition delays and required a moderate degree of combustion air preheating to ignite reliably. Despite the longer ignition delays associated with the pyrolysis oils, the cylinder pressure rise rates were significantly less than with No. 2 diesel fuel. Experimental ignition delay and heat release rates were interpreted using a phenomenological spray combustion model. Using a three parameter fit for vaporization, ignition, and combustion rate, the model showed that the longer ignition delays of the bio-oils result from slow chemistry relative to diesel fuel. The model also showed that the heat release profiles of the bio-oils are consistent with slow combustion chemistry and rapid mixing relativ...
142 citations
TL;DR: In this article, the authors investigated the thermodynamic and economic performances optimization for an ORC system recovering the waste heat of exhaust gas from a large marine diesel engine of the merchant ship.
142 citations