Long-term solar heat storage process by absorption with the KCOOH/H2O couple: Experimental investigation

Pierrès, Nolwenn Le; Huaylla, Fredy; Stutz, Benoı̂t; Perraud, Julien

doi:10.1016/j.energy.2017.10.111

Cited by 33 publications

(8 citation statements)

References 25 publications

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“…These processes are used to store both low-grade heat (<100°C) and medium-grade heat (100-400 °C) [144][145][146]. High kinetics at low temperatures make the sorption processes particularly attractive for low-temperature applications such as space heating, domestic hot water preparation or Some authors, e.g., Yu et al [126], use the definition sorption storage to indicate both reversible chemical reactions and sorption processes.…”

Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

“…These processes are used to store both low-grade heat (<100 • C) and medium-grade heat (100-400 • C) [143][144][145]. High kinetics at low temperatures make the sorption processes particularly attractive for low-temperature applications such as space heating, domestic hot water preparation or other low-grade and medium-grade heat uses [7,[146][147][148][149][150][151][152].…”

Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

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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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Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

Section: Thermochemical Processes and Materialsmentioning

confidence: 99%

A Review of Thermochemical Energy Storage Systems for Power Grid Support

et al. 2020

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“…Further research at the University of Savoie, is conducted based on KCOOH and H2O working pair [80]. The desorption process is performed at 59 °C at a condensing temperature of 16 °C resulting in a GTLD of 43 K as can be seen in figure 19.…”

Section: Closed Transportedmentioning

confidence: 99%

Sorption based long-term thermal energy storage – Process classification and analysis of performance limitations: A review

Fumey

Weber

Baldini

2019

Renewable and Sustainable Energy Reviews

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In sorption heat storage, one of the sources of discrepancy between theoretical material based energy storage potential and resulting system performance is the choice of process type. In this paper, in order to understand this performance deviation, a sorption heat storage process categorisation is proposed. This is followed by a review of reported sorption systems categorised according to the proposed process classification. An analysis of the reported systems is then undertaken focusing on the ratio of resulting temperature gain in sorption (ad-or absorption) compared to required temperature lift in desorption. This measure is termed temperature effectiveness and enables a form of system performance evaluation in the broad landscape of sorption thermal energy storage demonstrators. It is argued that other performance parameters such as volumetric energy storage density and volumetric charge and discharge power density are not adequate for comparison due to the highly varying testing conditions applied. From the system evaluation, it is seen that best temperature effectiveness is generally found in a closed, transported process with the ability of single sorbent pass and true counter flow heat exchange. Highlights • There are four basic sorption thermal energy storage processes, open fixed, open transported, closed fixed and closed transported.• Temperature effectiveness, the ratio of resulting sorption temperature lift to required desorption temperature lift, is a universal means for sorption heat storage system performance comparison.• Closed transported sorption thermal energy storage systems show the best performance in respect to temperature effectiveness.

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“…At the same time, the relevant thermophysical properties were investigated so that these systems could be better understood, designed, and run. 4,5 In 2016, Longo and Gasparella reported the thermal conductivity and dynamic viscosity measurements of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 274.15−353.15 K. 6 Later in 2018, Longo and Fedele measured the equilibrium vapor pressure of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 278.15−348.15 K, which is typical for desiccant application. 7 Wen et al made a comprehensive study on the thermal properties of aqueous HCOOK solution, including density, thermal conductivity, dynamic viscosity, heat capacity, and vapor pressure, with concentration varying from 65 to 74% and temperature from 293.15 to 338.15 K. 8 Up to now, most of the studies about aqueous HCOOK solution focused on its application as a desiccant.…”

Section: Introductionmentioning

confidence: 99%

Vapor Pressure of Aqueous HCOOK Solution as Working Fluids of an Absorption Heat Transformer at High Temperature

et al. 2020

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Aqueous potassium formate solution is regarded as a potential working fluid of an absorption heat transformer (AHT) because of its noncorrosive and biodegradable characteristics. The vapor pressure of working fluids is an important property for application in an absorption cycle. However, current experimental data are mostly limited to temperature and concentration ranges that are suitable for a dehumidification system. Thus, more accurate data of vapor pressure are anticipated. In this paper, the equilibrium vapor pressures of aqueous HCOOK solution were measured with a static method in the temperature range from 323.15 to 373.15 K. The mass concentration of HCOOK varied from 10 to 70%. The measured data were compared with the estimated values of a referenced chemical engineering property database (Aspen Plus). A relatively large mean absolute relative deviation (MARD) of 13.27% was found. The data were then correlated with a modified Antoine equation, and the MARD was reduced to 0.45%. The thermodynamic performance of aqueous HCOOK solution for AHT was estimated for a typical cycle.

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Long-term solar heat storage process by absorption with the KCOOH/H2O couple: Experimental investigation

Cited by 33 publications

References 25 publications

A Review of Thermochemical Energy Storage Systems for Power Grid Support

A Review of Thermochemical Energy Storage Systems for Power Grid Support

Sorption based long-term thermal energy storage – Process classification and analysis of performance limitations: A review

Vapor Pressure of Aqueous HCOOK Solution as Working Fluids of an Absorption Heat Transformer at High Temperature

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