Flexibility assessment of a pool of residential micro combined heat and power systems

Selinger-Lutz, Oliver; Pratidino, Ginong; Hollinger, Raphael; Fischer, David; Koch, Bárbara; Wittwer, Christof

doi:10.1016/j.enconman.2018.07.023

Cited by 13 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synergistic functions between buildings and vehicles are good solutions for enhancing the resilience and flexibility of electric grids with fluctuations in the energy supply of multi-energy systems. Furthermore, flexible energy demand [2 3], diversified energy storage [4], and robust control strategies for energy management [5][6][7][8][9] are promising sources of flexibility for the utility grid.…”

Section: Introductionmentioning

confidence: 99%

Heuristic battery-protective strategy for energy management of an interactive renewables–buildings–vehicles energy sharing network with high energy flexibility

Zhou

Cao

Hensen

et al. 2020

Energy Conversion and Management

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Heuristic battery-protective strategy for energy management of an interactive renewables–buildings–vehicles energy sharing network with high energy flexibility

Zhou

Cao

Hensen

et al. 2020

Energy Conversion and Management

View full text Add to dashboard Cite

“…(4), the total static temperature ratio is formulated in Eq. (6) where M c1 is the Mach number of the inlet absolute velocity c 1 .…”

Section: Calculation Of Homologous Points For Different Fluids Througmentioning

confidence: 99%

“…Power plants down-scaling has become a major challenge to promote a wider use of thermal renewable energy employing low-tomoderate temperature sources [1]. This may rise the contribution of solar [2], geothermal [3], biomass and waste energy [4] sources in future scenarios with increasing electricity distributed generation [5] and micro-combined heat and power systems [6]. However, a low temperature of the thermal source prevents the primary heat from being efficiently converted to electrical power.…”

Section: Introductionmentioning

confidence: 99%

Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids

Valdés

Sebastián

Abbas

2018

Energy Conversion and Management

View full text Add to dashboard Cite

The selection of working fluids other than air is a key issue in improving the efficiency of new thermodynamic cycles intended for low-to-moderate temperature small power plants The aim of this paper is to study whether the low efficiency typical of small turbomachinery is still a problem when using alternative fluids Based on a new design of power cycles named balanced hybrid Rankine-Brayton cycles, five different fluids were selected as potential working fluids: carbon dioxide, propane, isobutane, pentafluoroethane and sulfur hexafluoride Dimensional analysis was used to compare the performances of a micro-scale centrifugal compressor working in homologous points where the efficiency variation depends only on the Reynolds-number (Re) The influence of Re on efficiency was calculated by means of four different methods for comparative purposes Numerical simulations were also carried out in order to validate the methodological approach proposed The results show the efficiency variations as a function of Re for increasing fluid densities All the nonconventional fluids studied provide better performance in terms of efficiency than air Particularly, isobutane and propane have been identified as potential working fluids candidates for the aforementioned innovative power cycle *

show abstract

“…Since the load of an individual micro-CHP unit was so small, they studied pooling of a large number of devices. This was considered necessary to provide services to the grid or to actively participate in electricity markets [113]. Note that my research focused on a single system independent of other CHP systems and the grid.…”

Section: Chp Systemsmentioning

confidence: 99%

A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications

Darzi¹

View full text Add to dashboard Cite

A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications Mahdi Darzi This research was focused on the development of a framework for the energy optimization a natural gas engine for small combined heat and power (CHP) applications operating with lowpressure natural gas (NG) available at homes. The required targets of the ARPA-E GENSETS program for 1 kW electric power generation and previous GENSETS simulation at West Virginia University, suggested a design space for the engine which is currently dominated by simple twostroke designs. Hence this research focused on screening, modeling, and experimentally evaluation of cost-effective technologies to achieve a system design that maximized thermal efficiency and utilization factor, while reducing emissions. A baseline engine was selected which started with 8% brake thermal efficiency (BTE) on natural gas operation. By implementing intake and exhaust optimization BTE increased up to around 12% and with head design optimization and exhaust backpressure, the engine reached 15% BTE. Though the initial optimization methods almost doubled efficiency, it was realized that further increases in BTE must be achieved for a commercially competitive design. The engine was redesigned to utilize modified porting for enhanced breathing and scavenging and a method to deploy low-pressure direct injection (LPDI) was developed. With these enhancements, BTE increased to around 24%. A second round of optimization was performed then, by modeling the whole system in a 1D platform and using a genetic algorithm and experimental data to further optimize scavenging which increased the efficiency up to around 26%. Finally, a 3D computational fluid dynamics (CFD) was developed to investigate the stratification effects of LPDI and determine the optimal spark plug location. This effort increased the BTE to around 27.5%. To assess issues with commercial deployment, three different NG compositions and propane operation were investigated. With an energy balance and exergy distribution analysis for each fuel, fuel quality effects on the CHP system performance were determined. At the end, with combination literature review, experiments, 1D and 3D simulations, a framework for optimization of micro-CHP systems operating on gaseous fuels was developed that can serve industry to highlight methods that can more than triple brake thermal efficiency of small two-stroke engines while improving the energy distribution for CHP systems. iii Acknowledgment Special thanks to Dr. Johnson for his support and mentorship throughout my PhD program. I thank my dedicated PhD committee members for their guidance and valuable feedback to improve this dissertation. I would like to thank Mr.

show abstract

Flexibility assessment of a pool of residential micro combined heat and power systems

Cited by 13 publications

References 24 publications

Heuristic battery-protective strategy for energy management of an interactive renewables–buildings–vehicles energy sharing network with high energy flexibility

Heuristic battery-protective strategy for energy management of an interactive renewables–buildings–vehicles energy sharing network with high energy flexibility

Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids

A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications

Contact Info

Product

Resources

About