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 paper, an improved CTRC system containing both a preheater and regenerator (PR-CTRC) was introduced for recovering waste heat in exhaust gas and engine coolant of an engine, and compared its performance with that of the BCTRC system and also with the traditional excellent organic Rankine Cycle (ORC) systems using R123 as a working fluid.
110 citations
TL;DR: It is demonstrated that an electrical current can be induced in one conductor through cavity-mediated processes by heating up the other conductor, and the heat engine can reach Carnot efficiency with optimal conversion of heat to work.
Abstract: We propose and analyze the use of hybrid microwave cavities as quantum heat engines. A possible realization consists of two macroscopically separated quantum-dot conductors coupled capacitively to the fundamental mode of a microwave cavity. We demonstrate that an electrical current can be induced in one conductor through cavity-mediated processes by heating up the other conductor. The heat engine can reach Carnot efficiency with optimal conversion of heat to work. When the system delivers the maximum power, the efficiency can be a large fraction of the Carnot efficiency. The heat engine functions even with moderate electronic relaxation and dephasing in the quantum dots. We provide detailed estimates for the electrical current and output power using realistic parameters.
110 citations
TL;DR: In this article, various desalination methods are analyzed with respect to their primary energy consumption, sea-water treatment requirement and equipment cost, and the multiple effect boiling evaporator is concluded to be the most suitable method for stimulation by solar energy.
110 citations
TL;DR: In this article, polyoxymethylene dimethyl ethers (PODE) was blended with diesel fuel at volume ratio of 10, 20% and 30% in the preparation of PODE-diesel blend fuels (marked as P10, P20 and P30).
110 citations
05 Mar 2001
TL;DR: In this article, a boundary layer heat transfer model is proposed to predict the film coefficient of a homogeneous charge compression ignition (HCCI) combustion model, which is based on the boundary layer of a HCCI engine.
Abstract: The Homogeneous Charge Compression Ignition (HCCI) combustion concept is currently under widespread investigation due to its potential to increase thermal efficiency while greatly decreasing harmful exhaust pollutants. Simulation tools have been developed to explore the implications of initial mixture thermodynamic state on engine performance and emissions. In most cases these modeling efforts have coupled a detailed fuel chemistry mechanism with empirical descriptions of the in-cylinder heat transfer processes. The primary objective of this paper is to present a fundamentally based boundary layer heat transfer model. The two-zone combustion model couples an adiabatic core zone with a boundary layer heat transfer model. The model predicts film coefficient, with approximately the same universal shape and magnitudes as an existing global model. In addition, the new model resolves the boundary layer thickness and mass fraction trapped in the boundary layer, which are needed to predict and understand hydrocarbon quench. The two-zone model is then validated against experimental data and compared to the single zone formulation, which utilizes empirical heat transfer treatments.
109 citations