Author
Roy Douglas
Bio: Roy Douglas is an academic researcher from Queen's University Belfast. The author has contributed to research in topics: Organic Rankine cycle & Waste heat recovery unit. The author has an hindex of 14, co-authored 90 publications receiving 667 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors provide a methodology to compare sub-critical, trans-critical and wet expansion cycles and different types of expanders (both volumetric and turbomachinery) from both technical and economic point of view.
64 citations
TL;DR: In this paper, the authors investigated a solar combined heat and power system based on hybrid photovoltaic-thermal heat pump systems for the simultaneous provision of space heating and electricity to residential homes.
46 citations
TL;DR: In this paper, the authors investigated the application of a circular economy in a rural agricultural setting in Northern Ireland, centered around a typical anaerobic digestion (AD) plant, showing its potential to provide renewable energy for the electricity and transport fuel needs of an average dairy farm and associated milk processing facilities.
41 citations
TL;DR: In this paper, the authors present the analysis and results of a supercritical WHR (Waste Heat Recovery) ORC (Organic Rankine Cycle) modelling study, focusing on multiple series heat sources from vehicles and the potential of WHR ORCs to convert this into useful work.
40 citations
TL;DR: In this article, the authors investigated the impacts of forecast error on the operation and management of a pool-based electricity market in 2050 and found an increase in system marginal prices of approximately 1% for every percentage point rise in the offshore wind power forecast error regardless of the average forecast error sign.
34 citations
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TL;DR: The proposed ensemble approach has been extensively assessed using real wind farm data from China, and the results demonstrate that the uncertainties in wind power data can be better learned using the proposed approach and that a competitive performance is obtained.
530 citations
TL;DR: Johnson et al. as discussed by the authors summarized major developments in vehicular emissions regulations and technologies in 2013 and gave a brief, high-level overview of key developments in fuels, focusing on low-temperature deNOx and integration of components and control.
Abstract: The review paper summarizes major developments in vehicular emissions regulations and technologies in 2013. First, the paper covers the key regulatory developments in the field, including proposed light-duty (LD) criteria pollutant tightening in the US; and in Europe, the continuing developments towards real-world driving emissions (RDE) standards. Significant shifts are occurring in China and India in addressing their severe air quality problems. The paper then gives a brief, high-level overview of key developments in fuels. Projections are that we are in the early stages of oil supply stability, which could stabilize fuel prices. LD and HD (heavy-duty) engine technology continues showing marked improvements in engine efficiency. Key developments are summarized for gasoline and diesel engines to meet both the emerging NOx and GHG regulations. HD engines are or will soon be demonstrating 50% brake thermal efficiency using common approaches. NOx control technologies are then summarized, including SCR (selective catalytic reduction) systems and SCR filter developments. Emphasis is on low-temperature deNOx and integration of components and control. Diesel PM (particulate matter) reduction technologies are evolving around the behavior of ash deposits and SCR integration. Filters for direct injection gasoline applications are developing very rapidly, and in some cases the back pressure, light-off characteristics, and emissions reductions are very similar to standard three way catalysts (TWCs). Oxidation catalysts mainly involve developments towards stubborn problems, like low-temperature performance with exhaust with high hydrocarbon and CO, and methane oxidation. Finally, the paper discusses some key developments in gasoline gaseous emission control, focusing on matching engine calibration with emissions system characteristics; and on lean burn gasoline emissions control. CITATION: Johnson, T., "Vehicular Emissions in Review," SAE Int. J. Engines 7(3):2014, doi:10.4271/2014-01-1491. 2014-01-1491 Published 04/01/2014 Copyright © 2014 SAE International doi:10.4271/2014-01-1491 saeeng.saejournals.org 1207 This paper is posted on this website with permission from SAE International. It may not be shared, downloaded, duplicated, or transmitted in any manner without prior written permission from SAE.
365 citations
Book•
01 Feb 1996
TL;DR: The Design and Simulation of Two-Stroke Engines (DSENGINE) as mentioned in this paper provides practical and empirical assistance to the engine designer on many topics ranging from porting layout, to combustion chamber profile, to tuned exhaust pipes.
Abstract: Design and Simulation of Two-Stroke Engines is a unique hands-on information source. The author, having designed and developed many two-stroke engines, offers practical and empirical assistance to the engine designer on many topics ranging from porting layout, to combustion chamber profile, to tuned exhaust pipes. The information presented extends from the most fundamental theory to pragmatic design, development, and experimental testing issues.
297 citations
TL;DR: In this paper, an overview of the latest technology of the engine-Organic Rankine Cycle system in the applications of waste heat recovery from the heat sources with different temperatures, with particular concentration on diesel engines.
238 citations
19 Dec 2013
185 citations