Supercritical carbon dioxide cycles for power generation: A review

Emission characteristics of a spark-ignition engine fuelled with gasoline-n-butanol blends in combination with EGR

This review focuses on the observed characteristics of atmospheric newparticle formation (NPF) in different environments of the global troposphere. After a short introduction, wewill present a theoretical background that discusses themethods used to analyzemeasurement data on atmospheric NPF and the associated terminology.Wewill update on our current understanding of regionalNPF, i.e. NPF taking simultaneously place over large spatial scales, and complement that with a full review on reportedNPF and growth rates during regionalNPF events.Wewill shortly review atmospheric NPF taking place at sub-regional scales. Since the growth of newly-formed particles into larger sizes is of great current interest, wewill briefly discuss our observation-based understanding onwhich gaseous compounds contribute to the growth of newly-formed particles, andwhat implications this will have on atmospheric cloud condensation nuclei formation.Wewillfinish the reviewwith a summary of ourmain findings and future outlook that outlines the remaining research questions and needs for additionalmeasurements.

https://iopscience.iop.org/article/10.1088/1748-9326/aadf3c/pdf

Atmospheric new particle formation and growth : review of field observations

An overview on the light alcohol fuels in diesel engines

Biogas is a relatively mature renewable energy technology but still most commercial biogas power plants require significant financial incentives. Additionally, local shortages of very cheap digestible feedstocks limit biogas productivity, especially for larger biogas power plants (>1 MWe). Innovations that could improve cost-effectiveness and resource efficiency of biogas energy technology are therefore required. Over the last few years a number of potential process innovations for biogas technology have been proposed and investigated. However, the majority of these novel concepts has minimal or no impact on technology development. Disruptive innovations are very rare, but only they really matter for the economy. Therefore review reports that systematically compare, analyze and evaluate the suitability of these emerging methods with emphasis on technological excellence and realistic commercial potential are needed. This study presents potential process innovations from most recent patent and academic literature proposed for biogas (i) production, (ii) conditioning, (iii) utilization and (iv) industrial symbiosis. Within these four highly interdisciplinary categories the review attempts to provide short practical comments on selected methods and briefly analyzes their perspectives and constraints. Further, relevant biogas process innovation criteria are designed and multiple-criteria assessment of pre-selected potential process innovations is made. The paper concludes with the characterization of innovativeness of selected solutions and suggests future research needs for biogas energy technology that could bring new innovations in near term.

Sunyoup Lee

Papers

Performance and emission characteristics of a SI engine fueled by low calorific biogas blended with hydrogen

Isothermal transcritical CO2 cycles with TES (thermal energy storage) for electricity storage

Comparative study on EGR and lean burn strategies employed in an SI engine fueled by low calorific gas

Experimental investigation on the performance and emissions characteristics of ethanol/diesel dual-fuel combustion

Effects of engine operating conditions on particle emissions of lean-burn gasoline direct-injection engine