Assessment of adsorbate density models for numerical simulations of zeolite-based heat storage applications

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

doi:10.1016/j.apenergy.2015.10.126

Cited by 29 publications

(38 citation statements)

References 25 publications

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“…ethanol-water mixture shows a 15% enhancement in heat storage density with respect to the pure ethanol sorbate. Note that the heat storage density of water vapor on 13XBFK zeolite shown in previous works (Mette et al, 2014a;Lehmann et al, 2017) is 2-3 times higher with respect to the values measured here. The suboptimal performance observed in our tests are due to the implemented hydration process, which employs part of the released heat of adsorption to drive the phase change of the sorbate from liquid to vapor.…”

Section: Heat Storage Densitycontrasting

confidence: 57%

Water/Ethanol and 13X Zeolite Pairs for Long-Term Thermal Energy Storage at Ambient Pressure

et al. 2019

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Thermal energy storage is a key technology to increase the global energy share of renewables-by matching energy availability and demand-and to improve the fuel economy of energy systems-by recovery and reutilization of waste heat. In particular, the negligible heat losses of sorption technologies during the storing period make them ideal for applications where long-term storage is required. Current technologies are typically based on the sorption of vapor sorbates on solid sorbents, requiring cumbersome reactors and components operating at below ambient pressure. In this work, we report the experimental characterization of working pairs made of various liquid sorbates (distilled water, ethanol and their mixture) and a 13X zeolite sorbent at ambient pressure. The sorbent hydration by liquid sorbates shows lower heat storage performance than vapor hydration; yet, it provides similar heat storage density to that obtainable by latent heat storage (40-50 kWh/m 3) at comparable costs, robustness and simplicity of the system, while gaining the long-term storage capabilities of sorption-based technologies. As a representative application example of long-term storage, we verify the feasibility of a sorption heat storage system with liquid sorbate, which could be used to improve the cold-start of stand-by generators driven by internal combustion engines. This example shows that liquid hydration may be adopted as a simple and low-cost alternative to more efficient-yet more expensive-techniques for long-term energy storage.

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Section: Heat Storage Densitycontrasting

confidence: 57%

Water/Ethanol and 13X Zeolite Pairs for Long-Term Thermal Energy Storage at Ambient Pressure

et al. 2019

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“…Detailed modeling of water sorption in microporous materials was the subject of [111]. The potential-theory of micropore volume filling pioneered by Polanyi and Dubinin was studied as a useful tool for the description of adsorption equilibria.…”

Section: Energy Storagementioning

confidence: 99%

Clean, efficient and affordable energy for a sustainable future

et al. 2017

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“…The scheme of this case study is shown in Figure 5. Ferrucci et al [174] developed a hybrid system for household applications. This integrates a thermochemical system with an air conditioning system driven by grid and photovoltaic electricity.…”

Section: Thermochemical Storage Energy Systems In Power-to-heat Applimentioning

confidence: 99%

A Review of Thermochemical Energy Storage Systems for Power Grid Support

et al. 2020

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Power systems in the future are expected to be characterized by an increasing penetration of renewable energy sources systems. To achieve the ambitious goals of the “clean energy transition”, energy storage is a key factor, needed in power system design and operation as well as power-to-heat, allowing more flexibility linking the power networks and the heating/cooling demands. Thermochemical systems coupled to power-to-heat are receiving an increasing attention due to their better performance in comparison with sensible and latent heat storage technologies, in particular, in terms of storage time dynamics and energy density. In this work, a comprehensive review of the state of art of theoretical, experimental and numerical studies available in literature on thermochemical thermal energy storage systems and their use in power-to-heat applications is presented with a focus on applications with renewable energy sources. The paper shows that a series of advantages such as additional flexibility, load management, power quality, continuous power supply and a better use of variable renewable energy sources could be crucial elements to increase the commercial profitability of these storage systems. Moreover, specific challenges, i.e., life span and stability of storage material and high cost of power-to-heat/thermochemical systems must be taken in consideration to increase the technology readiness level of this emerging concept of energy systems integration.

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Assessment of adsorbate density models for numerical simulations of zeolite-based heat storage applications

Cited by 29 publications

References 25 publications

Water/Ethanol and 13X Zeolite Pairs for Long-Term Thermal Energy Storage at Ambient Pressure

Water/Ethanol and 13X Zeolite Pairs for Long-Term Thermal Energy Storage at Ambient Pressure

Clean, efficient and affordable energy for a sustainable future

A Review of Thermochemical Energy Storage Systems for Power Grid Support

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