Verification of hydrothermal stability of adsorbent materials for thermal energy storage

Frazzica, Andrea; Brancato, Vincenza

doi:10.1002/er.4270

Cited by 15 publications

(13 citation statements)

References 24 publications

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“…As one method for achieving higher performance of ATES research with an implementation of material such as MgNaX, various trials with aluminosilicates (AlPO) and silicoaluminophosphates (SAPO) have been conducted steadily to find higher energy densities and stable properties for reactions. Frazzica and Brancato have also investigated the hydrothermal stability of the SAPO medium of TES.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on adsorbent characteristics for adsorption thermal energy storage system

2019

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Summary The adsorption performance of the thermal energy storage (TES) system changes depending on the material properties of the adsorbent itself, but the change of the hardware structure can also substantially change the adsorption characteristics. In this study, a laboratory‐scale adsorption‐based TES system was constructed, and the adsorption performance of three adsorbents was evaluated in the same system to compare the adsorption performance between adsorbents. The adsorption characteristics of silica gel, zeolite 13X, and 4A, which are the most preferred adsorbents in the physical adsorption‐based TES system, were selected for evaluation. Experiments with each adsorbent were performed, including heat recovery to evaluate the heat transfer effect and the amount of heat recoverable in the actual TES system. Experimental results have identified several key characteristics of the adsorption and performance of each adsorbent in the TES system, as well as operating parameters that determine the influence of adsorption performance on the TES system. The actual energy storage density of the adsorbent is affected not only by the enthalpy of adsorption of the material itself but also by other factors. These factors include the difference in thermal conductivity that causes a difference in temperature distribution and the magnitude of mass transfer resistance due to the shape of the adsorbent particle and the actual TES system reactor structure. If the reaction heat generated during the adsorption reaction cannot be effectively released, the adsorption performance is significantly lowered due to the increased temperature of the reactor inside. This phenomenon was commonly observed in adsorbents examined in the present study. The uptake amount, X [g/g], was increased by allowing the inside of the reactor to be maintained at a lower temperature through heat recovery. In case of silica gel, the temperature rise during adsorption reaction is not high due to the difference of isotherm characteristics compared with zeolites, but it is possible to absorb more amount of adsorbate and to recover heat for a longer time. The energy storage density is affected by the temperature increase effect and the uptake amount of adsorbate during the adsorption reaction. The experimental results show that the energy storage density of zeolite 13X is 15% and 28.7% higher than that of silica gel and 4A, respectively, and the temperature rise due to heat generation during adsorption reaction is also high, which is advantageous in adsorption TES system performance.

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Section: Introductionmentioning

confidence: 99%

Comparative study on adsorbent characteristics for adsorption thermal energy storage system

2019

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“…The experimental ageing setup used in this work has been described elsewhere 40 . It consists in a vacuum chamber and in a glass evaporator/condenser; inside the vacuum chamber, three plate heat exchangers (HEX) are located to define the ageing conditions of the samples.…”

Section: Methodsmentioning

confidence: 99%

Cementitious composite materials for thermal energy storage applications: a preliminary characterization and theoretical analysis

Lavagna

Burlon

Nisticò

et al. 2020

Sci Rep

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The lack of robust and low-cost sorbent materials still represents a formidable technological barrier for long-term storage of (renewable) thermal energy and more generally for Adsorptive Heat Transformations—AHT. In this work, we introduce a novel approach for synthesizing cement-based composite sorbent materials. In fact, considering the number of available hygrosopic salts that can be accommodated into a cementitious matrix—whose morphological properties can be also fine-tuned—the new proposed in situ synthesis paves the way to the generation of an entire new class of possible sorbents for AHT. Here, solely focusing on magnesium sulfate in a class G cement matrix, we show preliminary morphological, mechanical and calorimetric characterization of sub-optimal material samples. Our analysis enables us to theoretically estimate one of the most important figures of merit for the considered applications, namely the energy density which was found to range within 0.088–0.2 GJ/m 3 (for the best tested sample) under reasonable operating conditions for space heating applications and temperate climate. The above estimates are found to be lower than other composite materials in the literature. Nonetheless, although no special material optimization has been implemented, our samples already compare favourably with most of the known materials in terms of specific cost of stored energy. Finally, an interesting aspect is found in the ageing tests under water sorption-desorption cycling, where a negligible variation in the adsorption capability is demonstrated after over one-hundred cycles.

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“…One challenge in material selection is the working capacity from the material's equilibrium curves that can be achieved at 40 ∘ C. Most novel materials that have been proposed for adsorption desalination showing high water capacities require regeneration temperatures well above 40 ∘ C, for example, MOF materials (90 ∘ C) 79,80 or zeolites AQSOA Z01 and Z02 (60 ∘ C and 80 ∘ C) 76,77 . Ionogels show outstanding performances at regeneration temperatures as low as 25 ∘ C.…”

Section: Model Analysismentioning

confidence: 99%

Adsorption reverse electrodialysis driven by power plant waste heat to generate electricity and provide cooling

2020

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Summary Steam power plants release more than half of the primary energy input as ultra low temperature heat below 40∘C into the environment causing thermal pollution. The emitted heat has a very low exergy content making it challenging to use as heat input by another process. Adsorption desalination combined with reverse electrodialysis can be powered by this heat and convert it into electricity. Thus, the system can mitigate thermal pollution and generate electricity at the same time. This study combines a validated reverse electrodialysis model with a dynamic adsorption desalination model that is validated with experimental data within this work. The experiments were conducted using a small‐scale adsorption desalinator and silica gel proving the feasibility of the regeneration at heat source temperatures as low as 40∘C. The simulations of the integrated system analyse different heat integration scenarios showing exergy efficiencies up to 15% and energy efficiencies up to 0.55%. Hence, the system could generate 65 kW electricity from a 20 MW heat source considering pumping losses.

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Verification of hydrothermal stability of adsorbent materials for thermal energy storage

Cited by 15 publications

References 24 publications

Comparative study on adsorbent characteristics for adsorption thermal energy storage system

Comparative study on adsorbent characteristics for adsorption thermal energy storage system

Cementitious composite materials for thermal energy storage applications: a preliminary characterization and theoretical analysis

Adsorption reverse electrodialysis driven by power plant waste heat to generate electricity and provide cooling

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