Water loading lift and heat storage density prediction of adsorption heat storage systems using Dubinin-Polanyi theory—Comparison with experimental results

Lehmann, Christoph; Beckert, Steffen; Nonnen, Thomas; Gläser, Roger; Kolditz, Olaf; Nagel, Thomas

doi:10.1016/j.apenergy.2017.07.008

Cited by 14 publications

(12 citation statements)

References 33 publications

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“…Experimental data for water isotherms on zeolite 13X are collected from the literature along with details on the adsorbent, activation procedure, and measurement technique where available. Table summarizes the adsorption isotherms extracted from the literature; ,,,− studies with isotherms which were found to be inconsistent either in shape (e.g., crossing isotherms or negative slopes) or magnitude (i.e., loading >50% discrepancy from the cluster of other isotherms) are excluded from this list. To allow for direct comparison between pure, crystalline samples and pelletized adsorbents, we normalize the reported loading as Where a study does not explicitly state the binder’s mass fraction, the binder mass fraction must be assumed.…”

Section: Resultsmentioning

confidence: 99%

Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X

2019

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Adsorption isotherms are reported for pure water vapor on zeolite 13X (also called zeolite NaX) pellets. Data were obtained using a gravimetric method over a temperature range of 25 to 100 °C and a pressure range of 0.006 to 25 kPa. These pure-component equilibria are fit with the Sips, Toth, and multisite Langmuir models, all modified with the Aranovich–Donohue (A–D) model. The A–D Sips isotherm is recommended for modeling water adsorption on zeolite 13X because it provides the best agreement with the measured isotherm data.

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Section: Resultsmentioning

confidence: 99%

Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X

2019

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“…Hereby, the emitted water vapor is therefore adsorbed by the zeolite, and the released enthalpy of adsorption Q ads can serve as a heat source in the process where a higher temperature is required. Until now, the value of the adsorption rate (quantity of adsorbate adsorbed by the adsorbent by a unit of mass or volume) achieved by certain studies and experiments carried out is not yet satisfactory [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85]. Moreover, maturity and self-sufficiency are still the major challenges to be addressed.…”

Section: Adsorption Storage Processmentioning

confidence: 99%

Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

Gbenou

Fopah-Lele

Wang

2021

Entropy

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Recent contributions to thermochemical heat storage (TCHS) technology have been reviewed and have revealed that there are four main branches whose mastery could significantly contribute to the field. These are the control of the processes to store or release heat, a perfect understanding and designing of the materials used for each storage process, the good sizing of the reactor, and the mastery of the whole system connected to design an efficient system. The above-mentioned fields constitute a very complex area of investigation, and most of the works focus on one of the branches to deepen their research. For this purpose, significant contributions have been and continue to be made. However, the technology is still not mature, and, up to now, no definitive, efficient, autonomous, practical, and commercial TCHS device is available. This paper highlights several issues that impede the maturity of the technology. These are the limited number of research works dedicated to the topic, the simulation results that are too illusory and impossible to implement in real prototypes, the incomplete analysis of the proposed works (simulation works without experimentation or experimentations without prior simulation study), and the endless problem of heat and mass transfer limitation. This paper provides insights and recommendations to better analyze and solve the problems that still challenge the technology.

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“…A typical AES system consists of three working phases: (i) the charging phase, (ii) the storage phase, and (iii) the discharging phase. Adsorption processes operate in bivariate adsorption equilibrium, where the equilibrium is controlled by the relative pressure, i.e., the ratio of the bulk gas pressure to the saturation pressure at the adsorbent temperature [23], [24]. Charging of the AES systems is achieved at low relative pressures.…”

Section: State-of-the-art Sorption-based Energy Storage Systemsmentioning

confidence: 99%

“…This is because the partial pressure of the water vapor depends on the moisture content or the humidity ratio. Hence, water is a popular adsorbate for AES systems [16], [23], [25], [26]. low-temperature reservoirs during the discharging process.…”

Section: State-of-the-art Sorption-based Energy Storage Systemsmentioning

confidence: 99%

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Sorption-based Energy Storage Systems: A Review

Thu¹,

Nasruddin²,

Mitra³

et al. 2019

MST

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Mismatched timing between the supply and demand of energy calls for reliable storage systems. Energy storage systems have become further significant with the widespread implementation of renewable energy. These systems can mitigate problems that are often associated with renewable energy sources such as supply unreliability while meeting the demand during peak hours. Energy can be stored in various forms, yet storage systems can be generally grouped based on their output forms, namely (i) electricity and (ii) heat or thermal energy. Electrical energy is the most convenient and effective form since it can power almost all modern devices. However, the electricity itself is vastly produced by thermodynamic cycles at a particular thermal efficiency using thermal energy from fossil fuels. Meanwhile, thermal energy for the HVAC&R and the production of hot water remains the largest portion of the building energy sector. Thermal energy can be stored in the form of sensible, latent, and thermochemical energy. This review focuses on thermochemical sorption-based energy storage systems. These systems exploit endothermic and exothermic sorption processes for charging and discharging of the thermal energy. Sorption-based storage systems exhibit huge potential due to a high energy density and their ability to store the energy at room temperature. We discuss the current state-of-the-art developments, key challenges, and future prospects of sorption-based energy systems.

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Water loading lift and heat storage density prediction of adsorption heat storage systems using Dubinin-Polanyi theory—Comparison with experimental results

Cited by 14 publications

References 33 publications

Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X

Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X

Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

Sorption-based Energy Storage Systems: A Review

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Water loading lift and heat storage density prediction of adsorption heat storage systems using Dubinin-Polanyi theory—Comparison with experimental results

Cited by 14 publications

References 33 publications

Equilibrium Adsorption Isotherms for H2O on Zeolite 13X

Equilibrium Adsorption Isotherms for H2O on Zeolite 13X

Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

Sorption-based Energy Storage Systems: A Review

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Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X

Equilibrium Adsorption Isotherms for H₂O on Zeolite 13X