Fuel-Air Mixing Challenges in Micro-Power Systems

2004 ◽  
Author(s):  
Kiran Dellimore ◽  
Christopher Cadou
Keyword(s):  
Power Systems ◽  
Air Mixing ◽  
Micro Power

scholarly journals Demonstration of a micro-fabricated hydrogen storage module for micro-power systems

2011 ◽  
Vol 196 (2) ◽  
pp. 820-826 ◽  
Author(s):  
Xi Shan ◽  
Joe H. Payer ◽  
Jesse S. Wainright ◽  
Laurie Dudik
Keyword(s):  
Power Systems ◽  
Hydrogen Storage ◽  
Micro Power

Vortex Tube Applications in Micro-Power Generation

2002 ◽  
Author(s):  
Selin Arslan ◽  
Bojan Mitrovic ◽  
Michael R. Muller
Keyword(s):  
Pressure Drop ◽  
Power Systems ◽  
Steam Turbine ◽  
Vortex Tube ◽  
Low Pressure ◽  
Total Efficiency ◽  
Pressure Drops ◽  
Large Pressure ◽  
Micro Power ◽  
Vortex Tubes

The purpose of this paper is to study vortex tube performance characteristics and the use of vortex tubes to increase the total efficiency of power systems, especially micropower systems. A vortex tube is a device in which compressed air is made to swirl and separate into two low-pressure streams, one with higher temperature than the entry and the other lower. The lack of moving parts and electricity make the vortex tube attractive for a number of specialized applications where simplicity, robustness and reliability are desired. Vortex tubes are currently used for industrial cooling applications, separation technologies, and chemical analysis. It is well known that the temperature difference between the hot and cold sides of the vortex tube scales with the pressure drop. Also, at any pressure drop, the temperatures and flow rates are dependent on the flow fractions between the hot and cold sides. Data is available for large pressure drops, but this paper presents experimental results at low-pressure drops optimizing the operational modes for various applications. The micro-power systems under consideration include micro-turbines, which evolved out of automotive turbocharger technology. The use of vortex tubes in power systems has received some attention but the use of both the hot and cold streams has never been considered. In this work, we consider such dual use. As an example of an application, the vortex tube is considered in conjunction with a heat recovery steam generator (HRSG). The vortex tube splits the turbine exhaust flow into hotter and cooler streams. The cooler stream is still hot enough to supply all needed heat in the economizer section, leaving the hotter stream to increase the exit temperature from the superheater. In this way both the air leaving the HRSG and going to the steam turbine will have an increased enthalpy and cycle efficiencies are improved. In addition, steam turbine exit quality is increased.

Physical Implementation and Manufacture of Adiabatic Flip-Flops for Micro Power Systems

2011 ◽  
Vol 460-461 ◽  
pp. 724-729
Author(s):  
Hong Li ◽  
Yu Zhang ◽  
Jian Ping Hu
Keyword(s):  
Power Systems ◽  
Two Phase ◽  
Ultra Low Power ◽  
Power Efficient ◽  
Parasitic Extraction ◽  
Physical Implementation ◽  
Micro Power ◽  
Pass Transistor ◽  
Logic Cells ◽  
Micro Systems

Flip-flops are main logic cells in digital systems, thus power-efficient designs are essential for micro systems, where ultra low-power hardware is demanded. This paper presents physical implementation and manufacture of adiabatic flip-flops based on CPAL (Complementary Pass-transistor Adiabatic Logic) circuits. The two mode-10 adiabatic counters based on four-phase and two-phase CPAL circuits have been implemented. For comparison, a conventional mode-10 counter using static CMOS circuits has also been embedded in a test chip. Full-custom layouts are drawn, and full parasitic extraction is done. The post-layout simulations are carried out using HSPICE. The chip has been fabricated with Chartered 0.35um process and tested.

Analysis of distributed energy resources for domestic electricity users

2012 ◽  
Vol 23 (2) ◽  
pp. 50-55 ◽  
Author(s):  
Atanda Raji ◽  
Mohamed Tariq Kahn
Keyword(s):  
Power Systems ◽  
Energy System ◽  
Middle Income ◽  
Hybrid Energy ◽  
Economics Of Scale ◽  
Systems Planning ◽  
Transmission Expansion ◽  
Geographical Regions ◽  
Micro Power ◽  
Domestic Electricity

After over a century with utilization of the benefits of economics of scale, power systems planning and development gets bigger and transmission grids have needed to transmit wide bringing the concept of onsite or close-to-load generation back. The turnaround strategy is prompted by market liberalization, transmission expansion constraints, related technology advancements, environmental pollution, health hazards, fossil fuel depletion, and climate change concerns. In the last decade, many countries have started the process of liberalisation of the electric systems, opening access to transmission and distribution grids.Technical feasibility analysis of a hybrid energy system for two types of geographical regions in South Africa using Homer is performed in this paper. Wind-PV hybrid systems are modelled as a micro-power system using Homer. The simulation results analyses conducted for a typical middle income earner electricity load profile for both a coaster and inlander domestic users of electricity showed that Wind-PV hybrid system is technically feasible and economical.

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