Auxiliary power unit

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For the generation of renewable combined heat and power (CHP), coupling a biomass gasifier with a solid oxide fuel cell (SOFC) system can be advantageous due to their matching operating conditions, thus lowering the number of heat exchangers and increasing the overall system efficiency. However, practical implementation is currently limited due to the lack of suitable coupling devices, particularly at small scales. Therefore, a novel prototype of a small-scale, high-temperature, oil-free compressor-turbine-

Supplying electricity, heat and cold is an essential part of the development of more sustainable city districts. Previous studies have illustrated interest in using the exergy efficiency concept to decompose the problem and rank the technology combinations for heating or cooling according to their overall efficiency. This methodology is extended herein to include network losses that depend on the temperature level and grid losses that play a role when comparing electricity supplied by the grid rather than b

Operating under high temperature (> 700 o C), solid oxide fuel cell (SOFC) devices can transform chemical energy from H 2 , ammonia, natural gas and other fuels into electricity and heat with high efficiency. Despite these advantages, the commercial deployment of SOFC systems faces significant challenges in maintaining safe, stable and optimal operation under dynamic power demands. These operational challenges stem from two primary factors: (1) external fuel composition variations, particularly in natural g

Fiber-reinforced Soft Pneumatic Actuators (SPAs) are found in mobile robots, assistive wearable devices, and rehabilitative technologies. Being intrinsically compliant and readily manufacturable they are attractive for use where safety and customizability are a priority. While different types of SPAs can be found to match the force performance requirements of a variety of applications, outlying system-level issues of robustness, controllability, and repeatability are not traditionally addressed at the actua

This article investigates the techno-economic performance of large integrated biogas Solid Oxide Fuel Cell (SOFC) power plants. Both atmospheric and pressurized operation is analysed with CO2 vented or captured. The SOFC module produces a constant electrical power of 1 MWe. Sensitivity analysis and multi-objective optimization are the mathematical tools used to investigate the effects of Fuel Utilization (FU), SOFC operating temperature and pressure on the plant energy and economic performances. FU is the d

Reservoir sedimentation is worldwide a significant long term problem and requires in view of the current mitigation measures an alternative and more sustainable solution. This challenge motivated the present study with the purpose to develop an alternative efficient method to release sediment out of a reservoir. The concept is based on the release of sediment through the headrace tunnel and turbines whereby a special focus was set on the fine sediment in the area in front of the power intakes. Specific jet

In order to create a new solar aircraft totally powered by the sun, a new method able to handle such a complex system must be developed. The project aim is to make a round-the-world flight in so as to promote the sustainable development. The aircraft power train will consist of solar cells placed on the wings, the energy storage system, the energy management electronics, the brushless DC motor and propellers. This paper presents the method to optimize the motor together with the propellers, to save the maxi

High defect density exhibited by nanoelectronic technologies, and parameter variability already affecting the operation of very-deep submicron CMOS systems demand for a combination of specific solutions, focusing at each various levels of abstraction in the development design-flow. Where traditionally applied methods fail under massive defect densities, we propose a top-down development strategy where the hardware overhead is adapted to the desired level of reliability. A CAD software tool supporting the me

This paper illustrates a methodology developed in order to facilitate the analysis of complex systems characterized by a large number of technical, economical and environmental parameters. Thermo-economic modeling of a natural gas combined cycle including monoethanolamine absorption CO2 separation option has been integrated within a multi-objective optimizer based on a genetic algorithm in order to characterize the economic and environmental potential of such complex systems within various contexts. A natur

Measurement of key plasma jet properties, such as the Mach number, electron density and temperature, in a low pressure environment, were performed using double Langmuir probes and Mach probes. In particular, under-expanded jets are studied in detail by performing complete mappings of plasma jet properties at chamber pressures of 10 and 2 mbar. These results show that the measured physical properties are consistent with the jet flow phenomenology, such as the presence of periodic expansion and compression zo

In this paper, a district heating, cooling and power generation unit has been evaluated from the viewpoints of cost and CO2 emissions. The superstructure considered includes a solid oxide fuel cell and gas turbine (SOFC-GT) combined cycle, a compression heat pump, an absorption chiller, a compression chiller and an additional boiler. Both physical and costing modeling has been developed for evaluating the economics and environmental benefits associated with the design and the operation of several possible c

Auxiliary power unit

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Design and experimental investigation of a high-temperature and oil-free compressor-turbine-unit for solid oxide fuel cell based combined heat and power

Exergy Efficiency Is a Key Performance Indicator to Rank Advanced Active Energy Technologies at the District Level

Safe and Optimal Operation of Commercial μ-CHP SOFC System Under Real-World Condition

Trunk postural tracking of assistive soft pneumatic actuator belt

Large size biogas-fed Solid Oxide Fuel Cell power plants with carbon dioxide management: Technical and economic optimization

Innovative and low cost continuous evacuation of sediment through the intake structure using multiple jets at the reservoir bottom

Brushless DC motor optimization process - Choice between standard or straight tooth shape

Design for Reliability of Nanometer-Scale Electronics under High Defect Density

Multi-Criteria Optimization of an Advanced Combined Cycle Power Plant including CO2 Separation Options

Characterization of supersonic low pressure plasma jets with electrostatic probes

Optimization of a Heating, Cooling and Power Generation District Unit based on a Solid Oxide Fuel Cell - Gas Turbine Combined Cycle from the Viewpoints of Cost and CO2 Emissions