Design and Optimization of Non-Supercitical CO2 Thermal Power Cycle for \u201cP2H2P\u201d Energy Storage System

2021 ◽  
Author(s):  
Ondrej Burian ◽  
Radek Skoda
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Design And Optimization ◽  
Power Cycle

Design and Optimization of Non-Supercritical CO2 Thermal Power Cycle for “P2H2P” Energy Storage System

2020 ◽  
Author(s):  
Ondrej Burian ◽  
Radek Skoda
Keyword(s):  
Energy Storage ◽  
Supercritical Co2 ◽  
Liquid Metals ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Power Cycles ◽  
Design And Optimization ◽  
Power Cycle ◽  
Advantages And Disadvantages

Abstract Most of the current research and development of CO2 cycles for power to heat - heat to power (P2H2P) energy storage systems are focused on applications of supercritical CO2 cycles. However, this work is focused on alternative application of CO2 power cycle with standard (i.e., non-supercritical) cycle and modified industrial turboexpanders as main working machines. Thermal Cycle for power storage system with thermal energy accumulator for energy storage and non-supercritical CO2 power cycle for backward production of electricity is described in this paper. The CO2 cycle is compared with Nitrogen cycle with same parameters as well. Initially, the thermal accumulator design, option of accumulation media (molten salts or liquid metals), and its parameters are described. The main part of the paper is focused on non-supercritical CO2 power cycles. Possible configurations of cycle, design aspects of main parts of cycle, possibilities of efficiency improvement are discussed; such as regeneration or intercooling. Finally, advantages and disadvantages of this CO2 and N2 cycle are discussed and compared. The concluding result of this paper is a very similar efficiency of the two working fluids at the selected parameters.

scholarly journals Analysis of thermochemical energy storage in an elemental configuration

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexandre Malley-Ernewein ◽  
Sylvie Lorente
Keyword(s):  
Energy Storage ◽  
Numerical Experiments ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Fast Response ◽  
Fluid Volume ◽  
Humid Air ◽  
Constructal Law ◽  
Overall Performance

Abstract Here we show theoretically that the design of a thermochemical energy storage system for fast response and high thermal power can be predicted in accord with the constructal law of design. In this fundamental configuration, the walls of the elemental cylinder are impregnated with salt, while humid air is blown through the tube. Cases with constant salt volume or constant fluid volume or both are considered. It is shown that the best design in each case meets the equipartition of imperfections principle. The predictions are confirmed by full numerical experiments, allowing to consider various shape ratios and study their impact on the overall performance.

An Optimum Sizing Methodology for Combined Photovoltaic-Energy Storage Electricity Generation Configurations

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
J. K. Kaldellis ◽  
D. Zafirakis ◽  
K. Kavadias ◽  
E. Kondili
Keyword(s):  
Energy Storage ◽  
Electricity Generation ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Local Network ◽  
Electrical Networks ◽  
Power Stations ◽  
Generation Cost

The electrification of autonomous electrical networks is in most cases described by low quality of electricity available at very high production cost. Furthermore, autonomous electrical networks are subject to strict constraints posing serious limitations on the absorption of renewable energy sources (RES)-based electricity generation. To bypass these constraints and also to secure a more sustainable electricity supply status, the concept of combining photovoltaic (PV) power stations and energy storage systems comprises a promising solution for small scaled autonomous electrical networks, increasing the reliability of the local network as well. In this context, the present study is devoted in developing a complete methodology, able to define the size of an autonomous electricity generation system, based on the maximum available solar potential exploitation at minimum electricity generation cost. In addition special emphasis is given in order to select the most cost-efficient energy storage configuration available. According to the calculation results obtained, one may clearly state that an optimum sizing combination of a PV generator along with an appropriate energy storage system may significantly contribute on reducing the electricity generation cost in several island electrical systems, providing also abundant and high quality electricity without the environmental and macro-economic impacts of the oil-based thermal power stations.

Maximizing Thermal Power Output of an Ammonia Synthesis Reactor for a Solar Thermochemical Energy Storage System

2000 ◽  
Vol 123 (2) ◽  
pp. 75-82 ◽  
Author(s):  
H. Kreetz ◽  
K. Lovegrove ◽  
A. Luzzi
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Storage System ◽  
Thermal Power ◽  
Recovery Process ◽  
Energy Storage System ◽  
Reactor Wall ◽  
Reversible Dissociation ◽  
Thermal Output ◽  
National University

Solar energy storage using a closed loop thermochemical system based on the reversible dissociation of ammonia, has been investigated at the Australian National University for over two decades. Theoretical and system studies have indicated that large scale systems offer reasonable thermodynamic and economic performance. Experimental investigation has confirmed the technical viability of the concept. This investigation has looked at the effect of operating parameters on the thermal output achievable from the heat recovery process. Pressure, massflow and inlet gas composition were all found to have significant effects on the output achievable. Maximizing the thermal output via adjustment of reactor wall temperature profiles indicates that the average temperature of the reactor walls is more significant than the shape of the profile. This investigation has indicated the potential and provided the foundations for future exergo-economic optimizations of the system.

scholarly journals Control Strategies and Economic Analysis of an LTO Battery Energy Storage System for AGC Ancillary Service

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 505 ◽  
Author(s):  
Bingxiang Sun ◽  
Xitian He ◽  
Weige Zhang ◽  
Yangxi Li ◽  
Minming Gong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Unit ◽  
Control Strategies ◽  
Storage System ◽  
Thermal Power ◽  
Energy Storage System ◽  
Automatic Generation ◽  
Utilization Rate ◽  
Frequency Regulation ◽  
Ancillary Service

With the rapid growth of renewable energy and the DC fast charge pile of the electric vehicle, their inherent volatility and randomness increase a power system’s unbalance of instantaneous power. The need for power grid frequency regulation is increasing. The energy storage system (ESS) can be used to assist the thermal power unit so that a better frequency regulation result is obtained without changing the original operating mode of the unit. In this paper, a set of different charging/discharging control strategies of the lithium titanate battery (LTO) is proposed, which are chosen according to the interval of the State of energy (SOE) to improve the utilization rate of the ESS. Finally, the cost-benefit model of the ESS participating in automatic generation control ancillary service is established. Case analysis proves that after a 1.75 MWh ESS is configured for a 600 MW thermal power unit, Kp and D is increased from 1.42 to 6.38 and 2857 to 6895 MW. The net daily income is increased from 20,284 yuan to 199,900 yuan with a repayment period of 93 days. The results show that the control strategies and the energy configuration method can improve the performance and economic return of the system.

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