Experimental characterization and simulation of a hybrid sensible-latent heat storage

Zauner, Christoph; Hengstberger, F.; Mörzinger, Benjamin; Hofmann, René; Walter, Heimo

doi:10.1016/j.apenergy.2016.12.079

Cited by 53 publications

(23 citation statements)

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“…The performance of heat exchangers with large PCM volumes in metal containers with an internal bundle of tubes has been studied by Lopez-Navarro et al [29]. Shell-and-tube heat exchangers [30] and macro encapsulated PCM in water vessels [31] have been tested for sensible-latent heat storage. Moreno et al [32] have investigated the corrosion of metal and metal alloy containers in contact with various PCMs.…”

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confidence: 99%

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

et al. 2018

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Document Version Peer reviewed versionLink back to DTU Orbit Citation (APA): Englmair, G., Moser, C., Furbo, S., Dannemand, M., & Fan, J. (2018). Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system. Applied Energy, 221, 522-534. https://doi. Highlights Combined short-and long-term heat-storage prototype for domestic solar heating  Interplay of solar collectors, four 200 kg PCM units and a 735 L water tank  Functionality of a segmented heat storage utilizing stable supercooling of SAT  Solidification of supercooled SAT was started by a seed crystal injection device  Supply temperatures and thermal power during PCM charge and discharge were evaluated Abstract A solar heating system with 22.4 m² of solar collectors, a heat storage prototype consisting of four 200 kg phase-change material (PCM) storage units, and a 735 L water tank was designed to improve solar heat supply in single-family houses. The PCM storage utilized stable supercooling of sodium acetate trihydrate composites to conserve the latent heat of fusion for long-term heat storage. A control strategy directed heat from a solar collector array to either the PCM storage or a water buffer storage. Several PCM units had to be charged in parallel when the solar collector output peaked at 16 kW. A single unit was charged with 27.4 kWh of heat within four hours on a sunny day, and the PCM temperature increased from 20 ºC to 80 ºC. The sensible heat from a single PCM unit was transferred to the water tankstarting with about 32 kW of thermal power after it had fully melted at 80 ºC. A mechanical seed crystal injection device was used to initialize the crystallisation of the sodium acetate trihydrate after it had supercooled to room temperature. The unit discharge during solidification peaked at 8 kW. Reliable supercooling was achieved in three of the four units. About 80% of latent heat of fusion was transferred from PCM units after solidification of supercooled sodium acetate trihydrate to the water tank within 5 hours. Functionality tests with practical operation conditions on the novel, modular heat-storage configuration showed its applicability for domestic hot water supply and space heating. Keywords: Solar heating system; heat storage prototype; phase change material; sodium acetate trihydrate; stable supercooling. P pump PCM phase-change material SA sodium acetate SAT sodium acetate trihydrate SH space heating V 2-way valve

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Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

et al. 2018

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“…Zauner et al performed numerical and experimental studies of hybrid sensible‐latent heat thermal storage with shell‐and‐tube heat exchanger geometry. High‐density polyethylene (HDPE) PCM was encapsulated in the metallic tubes, and thermo oil served as both SHS media and the HTF.…”

Section: Combined Tes Systemsmentioning

confidence: 99%

“…Based on the results, it has been found that the combined sensible-latent thermal storage system had better performance than had the traditional SHS system. 56 Zauner et al 90 performed numerical and experimental studies of hybrid sensible-latent heat thermal storage with shell-and-tube heat exchanger geometry. Highdensity polyethylene (HDPE) PCM was encapsulated in the metallic tubes, and thermo oil served as both SHS media and the HTF.…”

Section: Performance Investigations On Hybrid Sensible-latent Heat mentioning

confidence: 99%

Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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Summary Because of the unstable and intermittent nature of solar energy availability, a thermal energy storage system is required to integrate with the collectors to store thermal energy and retrieve it whenever it is required. Thermal energy storage not only eliminates the discrepancy between energy supply and demand but also increases the performance and reliability of energy systems and plays a crucial role in energy conservation. Under this paper, different thermal energy storage methods, heat transfer enhancement techniques, storage materials, heat transfer fluids, and geometrical configurations are discussed. A comparative assessment of various thermal energy storage methods is also presented. Sensible heat storage involves storing thermal energy within the storage medium by increasing temperature without undergoing any phase transformation, whereas latent heat storage involves storing thermal energy within the material during the transition phase. Combined thermal energy storage is the novel approach to store thermal energy by combining both sensible and latent storage. Based on the literature review, it was found that most of the researchers carried out their work on sensible and latent storage systems with the different storage media and heat transfer fluids. Limited work on a combined sensible‐latent heat thermal energy storage system with different storage materials and heat transfer fluids was carried out so far. Further, combined sensible and latent heat storage systems are reported to have a promising approach, as it reduces the cost and increases the energy storage with a stabilized outflow of temperature from the system. The studies discussed and presented in this paper may be helpful to carry out further research in this area.

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“…The accuracy was found to be sufficient. Zauner et al [23] tested two approaches for modeling a hybrid sensible-latent heat storage where the PCM is placed inside tubes of a shell-and-tube arrangement and the heat transfer fluid (thermal oil) flows around these tubes. In the first model, the Stefan problem is formulated to calculate the position of the phase interface dynamically and in the second model an effective specific heat capacity method is used.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

Dusek

Hofmann

2019

Energies

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Phase change materials are used in latent heat thermal energy storages to store a high amount of energy during phase change. A hybrid storage concept was developed with the aim of utilizing this high storage capacity in combination with Ruths steam storages. In the concept, a container filled with phase change material is placed at the shell surface of the Ruths steam storage. This container can be divided into several chambers filled with different phase change materials. An arrangement of electrical heating elements or heat exchangers at the internal side of these chambers is also provided. In this paper, a model of the hybrid storage concept is developed. The model consists of different sub-models, which are connected to each other. The simulation results of a hybrid storage show how important the model is for the analysis of the concept. Furthermore, the validation of the Ruths steam storage sub-model with operational measurement data of a storage line is presented. A maximum deviation between the operational measurement data and the simulation results of 6.43% occurs in terms of pressure at the internal side of the pressure vessel. In addition, the latent heat thermal energy storage sub-model was checked with the analytic solution.

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Experimental characterization and simulation of a hybrid sensible-latent heat storage

Cited by 53 publications

References 50 publications

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

Design and functionality of a segmented heat-storage prototype utilizing stable supercooling of sodium acetate trihydrate in a solar heating system

Review on solar thermal energy storage technologies and their geometrical configurations

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

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