Physical models for packed bed: Sensible heat storage systems

Elouali, Abdelmajid; Kousksou, T.; Rhafiki, T. El; Hamdaoui, Said; Mahdaoui, Mustapha; Allouhi, A.; Zéraouli, Y.

doi:10.1016/j.est.2019.03.004

Cited by 74 publications

(38 citation statements)

References 59 publications

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“…Thermal diffusivity and thermal conductivity determine the efficiency of charge and discharge in heat storage materials. 49 The materials need to have sufficiently high thermal conductivity that should be greater than 1 W/(m·K), 50 to allow the heat to quickly transfer between inside and the surface so that each part of the materials has a smaller temperature gradient 51 so as to reduce the thermal stress of the heat storage material and improve the heat exchange performance of the TES. Measuring the thermal diffusion coefficient is an indirect method for obtaining thermal conductivity.…”

Section: Resultsmentioning

confidence: 99%

Exploration of Basalt Glasses as High-Temperature Sensible Heat Storage Materials

et al. 2020

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Thermal energy storage (TES) systems are a key technology that utilizes renewable energy and low-level thermal energy to ensure continuous and stable operation in concentrated solar power plants, family heating, and industrial waste heat recovery fields. It solves the intermittent problem of solar radiation and significantly improves energy efficiency and economic benefits. Three varieties of natural basalt ores have been selected, namely, intermediate, basic, and ultrabasic basalt, which have been prepared into basalt glasses by the melt-quenching method. The applicability of basalt glass to high-temperature heat storage applications is studied. In the present paper, the chemical composition and structure of basalt glasses have been determined. The effect of temperature and composition on key thermophysical properties such as density, heat capacity, thermal diffusion, thermal conductivity, and thermal expansion has been analyzed during a series of thermal cycles. It has been confirmed that basalt glass has extremely high heat storage performance and thermal stability, and its working temperature is as high as 1000 °C such that it can be used as a solar energy heat storage material.

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Section: Resultsmentioning

confidence: 99%

Exploration of Basalt Glasses as High-Temperature Sensible Heat Storage Materials

et al. 2020

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“…Due to this concern, researchers are focusing on the utilization of renewable energy resources because of their sustainability and eco‐friendly nature. Among all the renewable energy resources, solar energy has received much attention in various applications, that is, water and space heating, power generation, solar desalination, solar drying, solar chimney and solar thermal storage applications . The major problem associated with solar energy is its intermittency .…”

Section: Introductionmentioning

confidence: 99%

“…Among all the renewable energy resources, solar energy has received much attention in various applications, that is, water and space heating, power generation, solar desalination, solar drying, solar chimney and solar thermal storage applications. [1][2][3][4] The major problem associated with solar energy is its intermittency. 5 Solar thermal systems generate energy when sunshine is available and there is no energy generation during non-sunshine periods.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of sensible and latent heat thermal energy storage systems

Suresh

Saini

2020

Int J Energy Res

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Summary The thermal energy storage is an essential subsystem for solar thermal energy systems. Few experimental studies are available to compare the performance of sensible and latent thermal energy storage systems for the same storage configurations. The comparison can provide guidance in selecting the storage system for particular solar thermal applications. The present work focuses on the experimental investigation of sensible and latent thermal storage systems with different mass flow rates. Concrete spheres and paraffin‐encapsulated metal capsules having a uniform diameter of 38 mm were taken as the packing elements and air as a heat transfer fluid for both the storage systems. The performance characteristics of both the storage systems have been evaluated in terms of charging time, instantaneous/cumulative energy absorption and energy storage under different flow rate conditions. Thermal mass, conductivity and flow rate has a substantial impact on temperature difference in the storage system. The charging time and energy storage capacity of the sensible thermal storage system was found to be lesser than the latent thermal storage system for all the flow rates. Based on the study, it is recommended that the latent thermal storage system is preferable for higher energy storage capacity, while for better charging and medium storage capacities sensible storage may be a good option.

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“…Solid materials such as pebbles, rocks, concrete, ceramics etc. [3,4] are commonly used in packed beds, which offers a number of advantages, including low cost and heat losses, non-toxic and non-flammable nature of these materials [5]. White et al investigated a packed bed arrangement with various storage materials and Argon as Heat Transfer Fluid (HTF) for pumped thermal storage [6].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling of Low Grade Thermal Energy Storage Using an Encapsulated Liquid Medium

Sevilla

Radulovic

2020

Journal of Thermal Engineering

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In the present study, we report the results obtained from numerical simulations of low grade heat storage. Four different fluid encapsulated materials were tested in four design types for their suitability as a small scale, low temperature thermal energy storage (TES). This was done by analysing and evaluating the maximum temperature reached per sphere for three different positions inside the tank, which correspond to the top right, centre and bottom right sphere. The influences of the material properties and the inlet/outlet tank designs were analysed and evaluated based on the results. The heat transfer fluid (HTF) was water and the storage materials selected were water, glycerol, MDM and MD3M. These were heated sensibly from an ambient temperature of 20°C to 90°C. The analysis shows that the materials with the highest relevant properties do not in fact charge the tank the fastest. Furthermore, the design of the inlet greatly affects the heating dynamics of the system, whereas changing the outlet design marginally affects the results.

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Physical models for packed bed: Sensible heat storage systems

Cited by 74 publications

References 59 publications

Exploration of Basalt Glasses as High-Temperature Sensible Heat Storage Materials

Exploration of Basalt Glasses as High-Temperature Sensible Heat Storage Materials

Thermal performance of sensible and latent heat thermal energy storage systems

Mathematical Modelling of Low Grade Thermal Energy Storage Using an Encapsulated Liquid Medium

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