Modeling and assessment of a thermochemical energy storage using salt hydrates

Al-Abbasi, Omar; Abdelkefi, Abdessattar; Ghommem, Mehdi

doi:10.1002/er.3776

Cited by 16 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Copper sulphate (CuSO 4 ) (H302, H315, H319, H410) is not one of the hydrates frequently found in the specialized literature, even though its thermodynamic properties are of interest for application at low temperatures 48 , 49 . Copper sulphate CAS-Nr.…”

Section: Methodsmentioning

confidence: 99%

New preparation methods for coated heat exchangers in adsorption refrigeration and heat pumps applications

Banos

Bergmann

Glorius

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Adsorption refrigeration systems and heat pumps still possess a relatively reduced market share as compared to the traditional compression systems. Despite having the great advantage of being powered by cheap heat (instead of expensive electric work), the implementation of systems based on adsorption principles remains limited to few specific applications. The main drawback that needs to be solved is their reduced specific power due to the low thermal conductivity and low stability of the adsorbents. The current state of the art of commercial adsorption cooling systems rely on adsorbers based on coated finned heat exchangers to optimize the cooling power. It is a well known result, that the reduction of the thickness of the coating derives in a reduction of the mass transport impedance, and that the increment of the ratio surface to volume of conductive structures increases the power without reducing the efficiency. The metallic fibres used in this work can offer a ratio of specific surface in the range of 2500–50,000 m2/m3.Three methods of preparing very thin but stable salt-hydrate coatings on metallic surfaces, including metallic fibres, for the production of coated heat exchangers with high specific power, are presented for the first time. A surface treatment based on aluminium anodizing was chosen to create a stronger bond between coat and substrate. The microscopic structure of the resulting surface was analysed by Scan Electron Microscopy. To verify the presence of the desired species Attenuated Total Reflectance-Fourier Transformed Infrared and Energy dispersive X-ray spectroscopy were employed in the analysis. Their capacity to form hydrates was verified via simultaneous Thermogravimetric Analysis (TGA)/Differential Thermogravimetry (DTG). Over a mass difference of 0.07 g(water)/g(composite) was detected in the coating of MgSO4, which showed signs of dehydration at temperatures around 60 °C, and repeatability after rehydration. Also positive results were obtained with SrCl2 and ZnSO4 with mass differences around 0.02 g/g below 100 °C. Hydroxyethyl Cellulose was chosen as additive to increase the stability and adherence of the coatings. The adsorption properties of the product were evaluated with simultaneous TGA-DTG, while their adherence was characterized by means of a procedure based on the test described in ISO2409. Coatings of CaCl2 displayed a much improved consistency and adherence, while retaining its adsorption capacity, showing mass differences of around 0.1 g/g at temperatures below 100 °C. Also MgSO4 retains the capacity of forming hydrates, showing a mass difference of more than 0.04 g/g below 100 °C. Finally, coated metallic fibres were investigated. Results show that the effective heat conductivity of a fibre structure coated with Al2(SO4)3 can be up to 4.7 times higher as compared to a block of pure Al2(SO4)3 . The coverage of the pursued coatings was visually investigated and the internal structure was evaluated by microscopic imaging of cross-sections. Coatings of around 50 µm of Al2(SO4)3 were generated, but in general the process requires optimization to achieve a more uniform distribution.

show abstract

Section: Methodsmentioning

confidence: 99%

New preparation methods for coated heat exchangers in adsorption refrigeration and heat pumps applications

Banos

Bergmann

Glorius

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Several research studies have shown the suitability of salt hydrates for thermal energy storage [45]. These materials dissociate into anhydrous salts, release water vapor when subjected to heat source, and store energy supplied for dehydration upon heating.…”

Section: Inorganic Pcmsmentioning

confidence: 99%

A Comprehensive Review of Thermal Energy Storage

2018

View full text Add to dashboard Cite

Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation. TES systems are used particularly in buildings and in industrial processes. This paper is focused on TES technologies that provide a way of valorizing solar heat and reducing the energy demand of buildings. The principles of several energy storage methods and calculation of storage capacities are described. Sensible heat storage technologies, including water tank, underground, and packed-bed storage methods, are briefly reviewed. Additionally, latent-heat storage systems associated with phase-change materials for use in solar heating/cooling of buildings, solar water heating, heat-pump systems, and concentrating solar power plants as well as thermo-chemical storage are discussed. Finally, cool thermal energy storage is also briefly reviewed and outstanding information on the performance and costs of TES systems are included.

show abstract

“…The authors concluded that the copper sulfate system could be driven by solar energy or other low temperature renewable energy heat source (55-85 °C), allowing the activation energy of 25.053 kJ/ mol. The salt dehydration studies were mostly in the '60s and '80s (Borchardt and Daniels, 1957;Reisman and Karlak, 1958;Wendlandt, 1962;Mu and Perlmutter, 1981;Sørensen, 1981), and some comparative studies with other thermochemical materials have been published in the last years (Glasser, 2014), (Savchenko et al, 2006), (Al-Abbasi et al, 2017). Wendlandt (1962) studied the dehydration of copper sulfate, concluding that the dehydration from hepta to the trihydrate occurs in two steps and an intermediate phase CuSO 4 •4 H 2 O at high pressures.…”

Section: Copper Sulfatementioning

confidence: 99%

Water sorption-based thermochemical storage materials: A review from material candidates to manufacturing routes

Palacios¹,

Navarro²,

Barreneche³

et al. 2022

Front. Therm. Eng.

View full text Add to dashboard Cite

A comprehensive and updated review is provided in this article, with a focus on water sorption-based thermochemical storage (WSTCS) materials, covering materials and their manufacturing routes. The state of the art of 22 most relevant salt hydrates is classified into seven groups (bromides, sulphates, carbonates, chlorides, nitrates, hydroxides, and sulphides) and studied as candidates. This is followed by a discussion on TCS material manufacturing, covering both conventional (shaping, pelletizing, etc.) and more advanced routes (e.g., extrusion, 3D printing, encapsulation, etc.). Finally, concluding remarks are presented, including limitations and future potentials for TCS research.

show abstract

Modeling and assessment of a thermochemical energy storage using salt hydrates

Cited by 16 publications

References 33 publications

New preparation methods for coated heat exchangers in adsorption refrigeration and heat pumps applications

New preparation methods for coated heat exchangers in adsorption refrigeration and heat pumps applications

A Comprehensive Review of Thermal Energy Storage

Water sorption-based thermochemical storage materials: A review from material candidates to manufacturing routes

Contact Info

Product

Resources

About