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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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Journal ArticleDOI
01 Jan 2013-Energy
TL;DR: In this article, both a RC thermodynamic model and a heat exchanger model have been developed to evaluate the vehicle exhaust WHR (waste heat recovery) potential using a RC (Rankine cycle ).

117 citations

Journal ArticleDOI
15 May 2016-Energy
TL;DR: In this article, the applicability of the new fluid as drop-in replacement for R245fa in existing ORC systems and compares system parameters such as cycle efficiency and power output was analyzed.

117 citations

Journal ArticleDOI
TL;DR: A detailed discussion on the hydrogen generation methods, fundamentals of characteristics of HCNG mixture, refinements on different fuel mixture affecting the combustion is provided in this article. But the authors do not consider the effect of lean burn combustion and three-way catalyst (TWC).
Abstract: With the huge growing demand of energy utilization and various threats posed due to the emissions had substantially led the thinkers to put on strategic plans to decrease the usage of energy and reduce the carbon contents of fuels. Moving ahead with these plans hydrogen enriched compressed natural gas (HCNG) engines have emanated as a forthcoming energy carrier for internal-combustion engines. Several nations are endeavoring hard to bring down the pollution level by promoting hydrogen enriched compressed natural gas-fueled vehicles, predominantly by powering medium and heavy transportation vehicles. In general, under precise circumstances the indicated thermal efficiency of the HCNG engine is much better than CNG engines without tolerating the high level of harmful emissions. In spite of that the hydrogen addition to NG provides increased NOx emission because of a great amount of heat generation inside the combustion chamber. However, it can be overcome by some extent of the application of lean burn combustion or with three-way catalyst (TWC). This report presented an encyclopedic overview of hydrogen enriched compressed natural-gas engines. This paper provides a detailed discussion on the hydrogen generation methods, fundamentals of characteristics of HCNG mixture, refinements on different fuel mixture affecting the combustion. For covering the prospects of the HCNG engines, its technical and numerical approaches are discussed. Furthermore, various methods are discussed which increase the power output and thermal efficiency along with a check on the emission parameters. An exploration of HCNG vehicle's demonstration projects worldwide is a key feature of this article.

117 citations

Journal ArticleDOI
TL;DR: In this paper, the performance, emissions and combustion characteristics of lean mixtures of natural gas and hydrogen were studied in a conventional spark ignited engine, and the results showed that at equivalence ratios leaner than 0.80, improvements in BHP, BSFC, and BTE were significant with hydrogen addition.
Abstract: The performance, emissions and combustion characteristics of lean mixtures of natural gas and hydrogen were studied in a conventional spark ignited engine. Specifically, mixtures of natural gas blended with 5, 10 and 15 percent by volume hydrogen were considered. Engine performance parameters included power (BHP), thermal efficiency (BTE), specific fuel consumption (BSFC), coefficient of variation in mean effective pressure, cumulative energy release schedule, and emissions of CO, NO x and hydrocarbons. Major conclusions of the work include: (t) at equivalence ratios leaner than 0.80, improvements in BHP, BSFC, and BTE were significant wilh hydrogen addition; (ii) significant extension of the lean operating limit to lower equivalence ratios was demonstrated with increasing hydrogen concentrations in natural gas; (iii) emissions of CO, NO^ and hydrocarbons decreased as equivalence ratio was reduced until partial burning became predominant; (iv) hydrogen addition appeared to allow stable engine operation wi...

116 citations

Journal ArticleDOI
TL;DR: In this article, a single-cylinder diesel engine with a rated output of 4.4 kW at 1500 rpm was converted to operate in the dual fuel mode and hydrogen was used as the inducted fuel and rubber seed oil (RSO), RSOME and diesel were used as main fuels in a dual fuel engine.

116 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023418
2022839
20211,279
20201,203
20191,197
20181,145