scholarly journals Shaft-Less Energy Storage Flywheel

2015 ◽  
Author(s):  
Xiaojun Li ◽  
Alan Palazzolo ◽  
Dustin Tingey ◽  
Xu Han ◽  
Patrick McMullen ◽  
...  
Keyword(s):  
Energy Source ◽  
Energy Storage ◽  
Power Plants ◽  
Data Centers ◽  
Department Of Energy ◽  
Regenerative Braking ◽  
Frequency Regulation ◽  
The Novel ◽  
Conventional Steel ◽  
Novel Design

This paper provides an overview of a 100 kw flywheel capable of 100 kW-Hr energy storage that is being built by Vibration Control and Electromechanical Lab (VCEL) at Texas A&M University and Calnetix Technologies. The novel design has a potential of nearly doubling the energy density of conventional steel flywheels. Applications include renewable energy source energy storage, frequency regulation at power plants, regenerative braking on vehicles and cranes and backup power at data centers and hospitals. The design and construction of this Department of Energy sponsored flywheel will be presented.

scholarly journals INVESTIGATION OF A NOVEL PRESSURE-ACTUATED BRUSH SEAL UNDER HOT STEAM CONDITIONS

2020 ◽  
Vol 4 ◽  
pp. 14-26
Author(s):  
Philip Reggentin ◽  
Jens Friedrichs ◽  
Johan Flegler ◽  
Ivan McBean
Keyword(s):  
Power Plants ◽  
The Novel ◽  
Basic Design ◽  
Test Rig ◽  
Brush Seal ◽  
Brush Seals ◽  
Increasing Demand ◽  
Improved Design ◽  
Flexible Operation ◽  
Novel Design

Due to the increasing demand towards flexible operation of conventional power plants also the seals of their turbines have to adapt to varying loads. Based on the basic design of a clamped brush seal, a novel seal with a pressure-actuated backplate is introduced which is capable of combining the advantages of low and high inclined brush seals while avoiding their undesired properties for flexible operation. During preliminary investigations on a test rig operated with compressed air and without rotation, the functionality of the improved design was demonstrated. It is shown that the leakage mass flow was lowered by up to 40% while undesired bristle oscillations were reduced by up to 90% at low pressure differences compared to conventional seal designs. After the adaption of the design for subsequent investigations under realistic conditions comparable to those in a steam turbine, further tests were conducted at TU Braunschweig´s hot steam test rig. Within these investigations the novel design showed improved properties regarding a high leakage performance and an advanced capability to avoid deterioration due to shaft excursions compared to brush seals with fixed backplate design.

Performance Analysis of Thermocline Energy Storage Proposed for the 1 MW Saguaro Solar Trough Plant

Solar Energy ◽  
2006 ◽  
Author(s):  
Gregory J. Kolb ◽  
Vahab Hassani
Keyword(s):  
Energy Storage ◽  
Power Plants ◽  
Storage System ◽  
Cost Effective ◽  
Energy Storage System ◽  
Simulation System ◽  
Department Of Energy ◽  
Time Dependent ◽  
Parabolic Trough ◽  
Storage Technology

The 1 MW Saguaro solar parabolic trough power plant began operation in December 2005. The plant will initially operate without an energy storage system. However, recent studies predict a thermocline-type storage should be the most cost-effective storage concept for solar parabolic troughs power plants. If such a system can be successfully demonstrated at Saguaro, future trough plants will likely adopt this storage technology. A thermocline storage system for Saguaro has been proposed by Department of Energy (DOE) laboratories and the solar industry. In this paper, the time-dependent performance of the proposed storage system was evaluated with a new model of the plant based on the TRNSYS simulation system. Results indicate that the proposed system should work well at Saguaro. The paper describes the TRNSYS model and the engineering insights gleaned from annual performance simulations of the plant.

Ultrathin paper-like boron-doped carbon nanosheet electrodes combined with boron-enriched gel polymer electrolytes for high-performance energy storage

2016 ◽  
Vol 4 (40) ◽  
pp. 15589-15596 ◽  
Author(s):  
Chuanlin Cai ◽  
Ping Yuan ◽  
Jiayong Tang ◽  
Yanhui Guo ◽  
Xiaohua Ma
Keyword(s):  
Energy Storage ◽  
Polymer Electrolytes ◽  
High Performance ◽  
Electrochemical Performances ◽  
Gel Polymer Electrolytes ◽  
The Novel ◽  
Boron Doped ◽  
Doped Graphene ◽  
Graphene Paper ◽  
Novel Design

The novel design of B-doped graphene paper electrodes combined with B-enriched gel polymer electrolytes endows symmetric SCs with outstanding electrochemical performances.

Hybrid buffer‐based optical packet switch with negative acknowledgment for multilevel data centers

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Sumit Chandra ◽  
Shahnaz Fatima ◽  
Raghuraj Singh Suryavanshi
Keyword(s):  
Data Centers ◽  
Web Applications ◽  
Optical Switch ◽  
Contention Resolution ◽  
Multilevel Data ◽  
All Optical ◽  
Optical Buffering ◽  
Different Types ◽  
Packet Switch ◽  
Novel Design

AbstractIn the present scenario, data centers serve many functionalities like storage, transfer of data, supporting web applications, etc. In data centers, various levels of hierarchy different types of switches are required; therefore, multifunctional data centers are desired. This paper discusses a novel design for optical switch which can be placed at various levels of hierarchy. In the proposed design, multifunctionality contention resolution schemes which consider electronic and optical buffering and all-optical negative acknowledgment (AO-NACK) are considered. In buffering technologies, contending packets are stored in either in electronic RAM or in fiber delay lines. In case of the AO-NACK scheme, contending packets are blocked, and a negative acknowledgment is sent back to the transmitting node and blocked packets are retransmitted. For various considered schemes, Monte Carlo simulation have been performed, results in terms of packet loss probability are presented, and it has been found that the performance of optical buffering is much superior to electronic buffering and AO-NACK schemes. It is found that, in the AO-NACK scheme, the numbers of retransmitted packets due to contention blocking are 33,304 which can be reduced to 7, by using a small amount of buffer at each node.

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