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, the second law was used to calculate the thermodynamic efficiency of a chemical manufacturing process, using as a basis for the efficiency the second-law, rather than a simple energy balance.
112 citations
Patent•
04 Oct 2007
TL;DR: In this article, a cascaded organic Rankine cycle (ORC) system with two waste heat sources from a positive-displacement engine (106) was proposed. But the system was not shown to work well in the real world.
Abstract: A method and system for operating a cascaded organic Rankine cycle (ORC) system (100) utilizes two waste heat sources from a positive-displacement engine (106), resulting in increased efficiency of the engine (106) and the cascaded ORC system (100). A high temperature waste heat source from the positive-displacement engine (106) is used in a first ORC system (102) to vaporize a first working fluid (118). A low temperature waste heat source from the positive-displacement engine (106) is used in a second ORC system (104) to heat a second working fluid (130) to a temperature less than the vaporization temperature. The second working fluid (130) is then vaporized using heat from the first working fluid (118). In an exemplary embodiment, the positive-displacement engine (106) is a reciprocating engine. The high temperature waste heat source may be exhaust gas and the low temperature waste heat source may be jacket cooling water.
112 citations
TL;DR: In this paper, the impact of ethanol addition on combustion characteristics such as combustion duration, ignition delay and emissions levels from diesel engines fuelled with blends of ethanol, diesel and jatropha methyl ester (JME) through port injection is investigated in order to determine its effect fuel viscosity reduction on diesel engine performance.
112 citations
TL;DR: In this article, the effects of preheat, engine type and type of vegetable oils on engine performance and exhaust gas emissions are discussed, as well as the effect of pre-heat on engine braking performance and emissions.
Abstract: Performance and emission characteristics of vegetable oils at elevated temperatures are studied. Fuels are run in two four-cycle, direct injection compression ignited engines having different number of cylinders, compression ratios, rated power and cooling systems but relatively close engine speed. Brake thermal efficiency, exhaust gas temperature, and CO, O2, Unburned HC and NO emissions are determined as a function of load at ambient and preheat conditions for peanut, sunflower and canola oils. Overall, effects of preheat, engine type and type of vegetable oils on engine performance and exhaust gas emissions are discussed.
111 citations
TL;DR: In this paper, a small-scale integrated gasification solid oxide fuel cell (SOFC) and Stirling engine for combined heat and power (CHP) with a net electric capacity of 120kW e have been performed.
111 citations