scholarly journals Multi-step hydration/dehydration mechanisms of rhombohedral Y2(SO4)3: a candidate material for low-temperature thermochemical heat storage

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15604-15613 ◽  
Author(s):  
Kunihiko Shizume ◽  
Naoyuki Hatada ◽  
Shoko Yasui ◽  
Tetsuya Uda
Keyword(s):  
Energy Storage ◽  
Low Temperature ◽  
Thermal Behavior ◽  
Reaction Mechanisms ◽  
Heat Storage ◽  
Phase Changes ◽  
Dehydration Reaction ◽  
Thermochemical Heat Storage

To evaluate rhombohedral Y2(SO4)3 as a new potential material for low-temperature thermochemical energy storage, its thermal behavior, phase changes, and hydration/dehydration reaction mechanisms are investigated.

scholarly journals Thermochemical energy storage – from fundamental research to TRL IV

2019 ◽  
Vol 108 ◽  
pp. 02013
Author(s):  
Piotr Babiński ◽  
Michalina Kotyczka – Morańska ◽  
Jarosław Zuwała
Keyword(s):  
Energy Storage ◽  
Heat Carrier ◽  
Storage Tank ◽  
Storage Capacity ◽  
Heat Storage ◽  
Solid Medium ◽  
Storage System ◽  
Reversible Reactions ◽  
Thermochemical Heat Storage ◽  
Fundamental Research

The paper presents the results of the fundamental research devoted to the application of MgSO4 as a heat carrier for thermochemical seasonal storage system devoted for household application followed by the results of 35kWh storage tank (TRL IV) charging and discharging tests. Seasonal thermochemical heat storage, based on the reversible reactions of hydratation and dehydratation of a solid medium gives an opportunity to accumulate the energy with a storage capacity exceeding 300-400 kWh/m3.

Characteristic microstructure underlying the fast hydration–dehydration reaction of β-La2(SO4)3: “fine platy joints” with “loose grain boundaries”

2018 ◽  
Vol 6 (48) ◽  
pp. 24956-24964 ◽  
Author(s):  
Kunihiko Shizume ◽  
Naoyuki Hatada ◽  
Kazuaki Toyoura ◽  
Tetsuya Uda
Keyword(s):  
Grain Boundaries ◽  
Heat Storage ◽  
Dehydration Reaction ◽  
Thermochemical Heat Storage ◽  
Characteristic Microstructure

The fast hydration/dehydration (water insertion/deinsertion) reaction of β-La2(SO4)3 is expected to be applied to thermochemical heat storage, but its kinetics have not been well understood.

scholarly journals Optimal Design of Combined Two-Tank Latent and Metal Hydrides-Based Thermochemical Heat Storage Systems for High-Temperature Waste Heat Recovery

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4216 ◽  
Author(s):  
Serge Nyallang Nyamsi ◽  
Mykhaylo Lototskyy ◽  
Ivan Tolj
Keyword(s):  
Energy Storage ◽  
Melting Point ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Storage Systems ◽  
Storage System ◽  
Metal Hydrides ◽  
Thermochemical Heat Storage

The integration of thermal energy storage systems (TES) in waste-heat recovery applications shows great potential for energy efficiency improvement. In this study, a 2D mathematical model is formulated to analyze the performance of a two-tank thermochemical heat storage system using metal hydrides pair (Mg2Ni/LaNi5), for high-temperature waste heat recovery. Moreover, the system integrates a phase change material (PCM) to store and restore the heat of reaction of LaNi5. The effects of key properties of the PCM on the dynamics of the heat storage system were analyzed. Then, the TES was optimized using a genetic algorithm-based multi-objective optimization tool (NSGA-II), to maximize the power density, the energy density and storage efficiency simultaneously. The results indicate that the melting point Tm and the effective thermal conductivity of the PCM greatly affect the energy storage density and power output. For the range of melting point Tm = 30–50 °C used in this study, it was shown that a PCM with Tm = 47–49 °C leads to a maximum heat storage performance. Indeed, at that melting point narrow range, the thermodynamic driving force of reaction between metal hydrides during the heat charging and discharging processes is almost equal. The increase in the effective thermal conductivity by the addition of graphite brings about a tradeoff between increasing power output and decreasing the energy storage density. Finally, the hysteresis behavior (the difference between the melting and freezing point) only negatively impacts energy storage and power density during the heat discharging process by up to 9%. This study paves the way for the selection of PCMs for such combined thermochemical-latent heat storage systems.

scholarly journals Thermal properties of thermochemical heat storage materials

2020 ◽  
Vol 22 (8) ◽  
pp. 4617-4625 ◽  
Author(s):  
Julianne E. Bird ◽  
Terry D. Humphries ◽  
Mark Paskevicius ◽  
Lucas Poupin ◽  
Craig E. Buckley
Keyword(s):  
Thermal Properties ◽  
Energy Storage ◽  
Transport Properties ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Energy Storage Materials ◽  
Storage Materials ◽  
Thermochemical Heat Storage ◽  
Heat Storage Materials

The thermal transport properties of potential thermal energy storage materials have been measured using identical conditions enabling direct comparison.

scholarly journals Design and Energy Analysis of a Solar Desiccant Evaporative Cooling System with Built-In Daily Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2429
Author(s):  
Fahid Riaz ◽  
Muhammad Abdul Qyyum ◽  
Awais Bokhari ◽  
Jiří Jaromír Klemeš ◽  
Muhammad Usman ◽  
...  
Keyword(s):  
Energy Storage ◽  
Magnesium Chloride ◽  
Heat Storage ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Subtropical Climate ◽  
Solar Fraction ◽  
Daily Energy ◽  
Thermochemical Heat Storage ◽  
Evaporative Cooling System

Heat storage with thermochemical (TC) materials is a promising technology for solar energy storage. In this paper, a solar-driven desiccant evaporative cooling (DEC) system for air-conditioning is proposed, which converts solar heat energy into cooling with built-in daily storage. The system utilises thermochemical heat storage along with the DEC technology in a unique way. Magnesium Chloride (MgCl2·6H2O) has been used, which serves as both a desiccant and a thermochemical heat storage medium. The system has been designed for the subtropical climate of Lahore, Pakistan, for a bedroom with 8 h of cooling requirements during the night. MATLAB has been employed for modelling the system. The simulation results show that 57 kg of magnesium chloride is sufficient to meet 98.8% of cooling demand for the entire month of July at an elevated cooling requirement. It was found that the cooling output of the system increased with increasing heat exchanger effectiveness. The heat exchangers’ effectiveness was increased from 0.7 to 0.8, with the solar fraction increased from 70.4% to 82.44%. The cooled air supplied to the building meets the fresh air requirements for proper ventilation.

A Hybrid Decision-Making Method for the Selection of a Phase Change Material for Thermal Energy Storage

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Uma Maheswararao Gaddala ◽  
Jaya Krishna Devanuri
Keyword(s):  
Thermal Stability ◽  
Decision Making ◽  
Energy Storage ◽  
Low Temperature ◽  
Thermal Energy ◽  
Thermophysical Properties ◽  
Heat Storage ◽  
Temperature Heat ◽  
Selection Of ◽  
Melting And Solidification

Abstract Phase change materials (PCMs) are considered to be promising contenders for thermal energy storage (TES) due to their high latent heat and nearly constant temperature during the intake/release of heat. The present study focuses on providing the most suitable PCM for low-temperature (40–80 °C) heat storage applications. However, the selection of the most suitable one from the wide range of PCMs for an application needs a thorough insight of their thermophysical properties, thermal stability, compatibility, and melting and solidification behavior. Among the PCMs available for low-temperature heat storage applications, organic PCMs stand as an attractive option. Based on melting point temperature, latent heat, cost, and ease of availability, five widely used organic PCMs, viz., lauric acid (LA), myristic acid (MA), stearic acid (SA), paraffin wax (PW), and palmitic acid (PA), are selected. Initially, thermophysical properties are measured and tabulated. Subsequently, thermal stability experiments up to 1500 melting/freezing cycles, compatibility studies with container materials (aluminum and stainless steel (SS)), and melting and solidification experiments giving total melting and solidification times are performed. Further, a hybrid multiple attribute decision-making (MADM) method is employed to select the best PCM based on the obtained experimental results. During the selection process at first, the subjective weights of the attributes are measured according to the analytical hierarchy process (AHP). Later, the PCMs are ranked based on the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). The hybrid MADM results show that among the selected PCMs, paraffin wax is the optimal PCM for low-temperature heat storage applications.

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