scholarly journals Electricity Generation Using a Hybridized Zeolite Adsorption Heat Pump and Heat Engine

2020 ◽  
Vol 12 (4) ◽  
pp. 75
Author(s):  
Linus Kweku Labik ◽  
Bright Kwakye-Awuah ◽  
Baah Sefa-Ntiri ◽  
Eric Kwabena Kyeh Abavare ◽  
Isaac Nkrumah ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Pump ◽  
Electricity Generation ◽  
Storage System ◽  
Heat Engine ◽  
Adsorbed Water ◽  
Energy Storage System ◽  
Adsorption Heat ◽  
Average Temperature ◽  
Adsorption Heat Pump

The use of adsorption in Thermal Energy Storage has gained considerable research interest of late. Some applications have focused on the use of TES for transformation of low temperature heat in applications such as cooling and heating. Zeolite and water have been studied as suitable materials. Their characteristics as environmentally friendly materials and high affinity makes them conspicuous. The unique properties of zeolites to hold adsorbed water/heat with very minimal loss is also significant. With the aid of a dynamo, a Stirling engine as heat engine and the adsorption energy storage system serving as heat pump was used to generate electricity. The relationship between electricity generation and temperature was investigated. The obtained average temperature and pressure of the zeolite - water adsorption heat pump was also compared with the basic adsorption cycle.

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.

scholarly journals Thermodynamic Performance of a Brayton Pumped Heat Energy Storage System: Influence of Internal and External Irreversibilities

Entropy ◽  
2021 ◽  
Vol 23 (12) ◽  
pp. 1564
Author(s):  
David Pérez-Gallego ◽  
Julian Gonzalez-Ayala ◽  
Antonio Calvo Hernández ◽  
Alejandro Medina
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Heat Engine ◽  
Coupled System ◽  
Packed Bed ◽  
Physical Region ◽  
Energy Storage System ◽  
Working Fluid ◽  
Round Trip ◽  
Output Efficiency

A model for a pumped thermal energy storage system is presented. It is based on a Brayton cycle working successively as a heat pump and a heat engine. All the main irreversibility sources expected in real plants are considered: external losses arising from the heat transfer between the working fluid and the thermal reservoirs, internal losses coming from pressure decays, and losses in the turbomachinery. Temperatures considered for the numerical analysis are adequate for solid thermal reservoirs, such as a packed bed. Special emphasis is paid to the combination of parameters and variables that lead to physically acceptable configurations. Maximum values of efficiencies, including round-trip efficiency, are obtained and analyzed, and optimal design intervals are provided. Round-trip efficiencies of around 0.4, or even larger, are predicted. The analysis indicates that the physical region, where the coupled system can operate, strongly depends on the irreversibility parameters. In this way, maximum values of power output, efficiency, round-trip efficiency, and pumped heat might lay outside the physical region. In that case, the upper values are considered. The sensitivity analysis of these maxima shows that changes in the expander/turbine and the efficiencies of the compressors affect the most with respect to a selected design point. In the case of the expander, these drops are mostly due to a decrease in the area of the physical operation region.

Underground CSP Thermal Energy Storage

2019 ◽  
Author(s):  
Roohany Mahmud ◽  
Mustafa Erguvan ◽  
David W. MacPhee
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Fossil Fuels ◽  
Storage System ◽  
Heat Engine ◽  
Energy Storage System ◽  
Electricity Demand ◽  
Heat Transfer Fluid ◽  
Concentrated Solar Power ◽  
Thermal Sources

Abstract Concentrated Solar Power (CSP) is one of the most promising ways to generate electricity from solar thermal sources. In this situation, large tracking mirrors focus sunlight on a receiver and provide energy input to a heat engine. Inside the receiver the temperature can be well above 1000°C, and molten salts or oils are typically used as heat transfer fluid (HTF). However, since the sun does not shine at night, a remaining concern is how to store thermal energy to avoid the use of fossil fuels to provide baseline electricity demand, especially in the late evenings when electricity demand peaks. In this study, a new method will be investigated to store thermal energy underground using a borehole energy storage system. Numerical simulations are undertaken to assess the suitability and design constraints of such systems using both molten salt as HTF.

Analysis of Combined Ground-Source Heat Pump and Water Energy Storage System and its Economic Impact Factors

2014 ◽  
Vol 953-954 ◽  
pp. 771-774
Author(s):  
Xiao Ting Wu ◽  
Ling Xia Kong ◽  
Chun Mei Guo ◽  
Bin Hu
Keyword(s):  
Energy Storage ◽  
Heat Pump ◽  
Storage System ◽  
Energy Storage System ◽  
Economic Benefits ◽  
Impact Factors ◽  
Ground Source Heat Pump ◽  
Local Policy ◽  
Air Conditioning System ◽  
Ground Source

This paper makes an introduction of the working principle and the technical and economic benefits of the combined ground-source heat pump and water energy storage system. And then according to the characteristic of this system itself and its mode of operation, we can point out that the energy storage rate, the local policy of electricity price and the strategy of operation are the main factors which influent the economic characteristics of the system. Using the initial investment and the operation cost of the system as the economy evaluation index, we respectively analyze the influence of the above factors on the index. And wish the results of the analysis can provide reference on the design of this new type air-conditioning system.

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