scholarly journals Hot Water Preparation along with Combined Solar Thermochemical Energy Storage System: Experimental Validation and Performance Simulation

2020 ◽  
Vol 03 (02) ◽  
pp. 1-1
Author(s):  
Oleksandr Skrylnyk ◽  
◽  
Emilie Courbon ◽  
Nicolas Heymans ◽  
Marc Frère ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Storage System ◽  
Energy Storage System ◽  
Hot Water ◽  
Solar Thermal ◽  
Energy Storage Density ◽  
Equilibrium Conditions ◽  
Dynamic Simulations ◽  
Storage Density

Hybrid solar thermal systems are considered to be a promising solution for delivering clean thermal energy for the building sector, especially while combining them with other renewable energy sources. Usually, solar energy production does not match the thermal energy demand, and hence the energy storage must be integrated. Thermochemical energy storage is adapted particularly to be used along with solar thermal applications. In this article, the design of the combined solar thermochemical energy storage system is presented. The experimental prototype was built and tested within atmospheric conditions. The model of the thermochemical reactor was developed using Matlab® and it was validated by the experimental data. The dynamic simulations of the combined solar thermal system for the preparation of domestic hot water were carried out in the TRNSYS environment. The experimental energy storage density of the fully dehydrated material under non-equilibrium conditions was measured between 102 and 158 kWh/m³. Dynamic simulations performed in a broader scope of climate conditions showed that the energy storage density in the material under non-equilibrium conditions could vary between 71 and 247 kWh/m³.

A Hybrid Energy Storage System Based on Metal Hydrides for Solar Thermal Power and Energy Systems

2016 ◽  
Author(s):  
Shahin Shafiee ◽  
Mary Helen McCay
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Storage Systems ◽  
Storage System ◽  
Metal Hydrides ◽  
Energy Storage System ◽  
Solar Thermal ◽  
Thermal Mass ◽  
Thermal System ◽  
Solar Thermal System

Thermal storage in an important operational aspect of a solar thermal system which enables it to deliver power or energy when there is no sunlight available. Current thermal storage systems in solar thermal systems work based on transferring the generated heat from sunlight to a thermal mass material in an insulated reservoir and then withdraw it during dark hours. Some common thermal mass materials are stone, concrete, water, pressurized steam, phase changing materials, and molten salts. In the current paper, a hybrid thermal energy storage system which is based on two metal hydrides is proposed for a solar thermal system. The two hydrides which are considered for this system are magnesium hydride and lanthanum nickel. Although metal hydride Energy Storage Systems (ESS) suffer from slow response time which restricts them as a practical option for frequency regulation, off peak shaving and power supply stabilization; they can still demonstrate significant flexibility and good energy capacity. These specifications make them good candidates for thermal energy storage which are applicable to any capacity of a solar thermal system just by changing the size of the ESS unit.

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