In-depth investigation of thermochemical performance in a heat battery: Cyclic analysis of K2CO3, MgCl2 and Na2S

Sögütoglu, LC; Donkers, Paj Pim; Fischer, H.; Huinink, HP Henk; Adan, Ocg Olaf

doi:10.1016/j.apenergy.2018.01.083

Cited by 80 publications

(34 citation statements)

References 32 publications

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“…This is surely due to the poor thermal conductivity of the sample, which results in temperatures lower than those measured at the surface of the heat exchanger. In addition, equilibrium tests to determine the thermodynamic properties of the adsorbent species can be conducted, following the principle described in [27]. The evaporator and reactor can be separated by means of a needle valve.…”

Section: Resultsmentioning

confidence: 99%

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

2020

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Adsorption processes are of great interest in catalysis, material separation, and thermal management. In recent decades, adsorbents have been further investigated because of their applications in adsorption refrigeration, heat pumps, and thermal energy storage. Thus, there is an increasing need to determine the macroscopic properties of the adsorbent, specifically their adsorption/desorption capacity and speed, because these two factors determine the power and size of the corresponding adsorber. Many designs have been proposed, but there is still not a generally adopted technology for the analysis of those properties. In this paper, a novel instrument is described, which is capable of determining the macrokinetic properties of an adsorbent composite, with better control and higher accuracy than gravimetric, volumetric, or barometric installations, and lower price and complexity than spectroscopic installations. The design of the installation is detailed, highlighting the main challenges and critical factors. The two working modes of the installation are described, and one example is provided and analyzed for each of them.

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Section: Resultsmentioning

confidence: 99%

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

2020

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“…This salt is labelled as dangerous (Category 1) because it causes serious eye damage/irritation. Potassium carbonate (K 2 CO 3 ) is a highly promising and deeply investigated adsorbent in the field of thermal energy storage [41,42]. It loses 1.5 molecules of water at 104 • C with a vapor pressure of 20 mbar and an enthalpy around 65.8 kJ/mol of water.…”

Section: Methodsmentioning

confidence: 99%

Systematic Analysis of Materials for Coated Adsorbers for Application in Adsorption Heat Pumps or Refrigeration Systems

et al. 2020

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Water vapor sorption in salt hydrates is a promising method to realize seasonal solar heat storage. Several of these materials have already shown promising performance for this application. However, a significant bottle neck for applications is the low thermal conductivity. In this study, several fabrication methods of the fixation of salts and their hydrates on metals to overcome the problem are presented. The products are analyzed concerning the hydration states, the corrosion behavior, the chemical compatibility, and the mechanical stability.

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“…The second started with a purified hydrated K 2 CO 3 •1.5H 2 O composite (produced by Caldic) in vessel 2 and initially an empty vessel 1. The temperature conditions in both experiments are similar: the temperature of vessel 2 varied between 40 and 90 • C and vessel 1 was kept at 10 • C. The exact hydration/dehydration conditions of K 2 CO 3 are described in more detail in the literature [25]).…”

Section: Experimental Approachmentioning

confidence: 99%

“…Decomposition of the TCM (i.e., HCl by MgCl 2 [24], H 2 S by Na 2 S [25] and CO 2 by impurities in K 2 CO 3 [25]) .…”

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confidence: 99%

Effect of Non-Condensable Gasses on the Performance of a Vacuum Thermochemical Reactor

et al. 2020

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A promising heat storage technique is based on thermochemical materials (TCM). Such materials are often used in closed systems under vacuum conditions, which is demonstrated in several projects in the European H2020 R&D programs. In this type of systems, non-condensable gasses (NCG) may have a significant effect on the reactor performance. This paper considers the potential effects of NCG on vacuum TCM reactor performance in detail. Water is used as working material to study NCG. Both experiments and numerical simulations show that the effect of NCG cannot be neglected. A small amount of NCG in a vacuum setup will significantly reduce the evaporation/condensation rate. It will transform the transport process from convection-based into diffusion-based in case the pressure of NCG at the condenser surface is equal to the pressure difference between the evaporator/condenser. Designing a stable vacuum storage system, puts high demands on leak tightness of the reactors but also on avoiding NCG release originating from TCM and any used material in the reactor (like coatings and glue). Additional free volume in the reactor will help to reach the demands of stable performance over longer working periods but decreases system energy density, being a crucial KPI. With help of our model, the performance of a system can be determined.

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In-depth investigation of thermochemical performance in a heat battery: Cyclic analysis of K2CO3, MgCl2 and Na2S

Cited by 80 publications

References 32 publications

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

Systematic Analysis of Materials for Coated Adsorbers for Application in Adsorption Heat Pumps or Refrigeration Systems

Effect of Non-Condensable Gasses on the Performance of a Vacuum Thermochemical Reactor

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