Thermal performance comparison of three sensible heat thermal energy storage systems during charging cycles

Lugolole, Robert; Mawire, Ashmore; Lentswe, Katlego; Okello, Denis; Nyeinga, Karidewa

doi:10.1016/j.seta.2018.09.002

Cited by 43 publications

(18 citation statements)

References 25 publications

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“…R. Lugolole et al suggests granite pebbles as the filler for an experimental packed bed setup in which the HTF is sunflower oil. Their results are in agreement with previous studies confirming good thermal performance due to high specific heat capacity and low viscosity at high temperatures, which is beneficial for the ease of circulation [9]. Furthermore, Mawire A. published experimental results of the performance of sunflower oil as both a heat storage medium and heat transfer fluid, reporting that high temperature charging resulted in high energy and exergy, but faster heat loss and low heat retention [10].…”

Section: Introductionsupporting

confidence: 89%

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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Section: Introductionsupporting

confidence: 89%

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

Sevilla

Radulovic

2020

Journal of Thermal Engineering

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“…Sensible heat storage using pebbles of two different sizes with sunflower oil, shell thermia B and shell thermia C, as heat transfer fluids was reported. 67 Granite rock pebbles with average diameters of 10.5 and 31.9 mm were used as small pebbles and big pebbles, respectively. The charging behavior of pebble bed heat storage system were reported as shown in Table 5.…”

Section: Solar Heat Storage In Packed Bedmentioning

confidence: 99%

A review on thermal energy storage systems in solar air heaters

Haldorai¹,

Gurusamy²,

Pradhapraj

2019

Int J Energy Res

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Summary The drying needs of agricultural, industrial process heat requirements and for space heating, solar energy is one of the prime sources which is renewable and pollution free. As the solar energy is inconsistent and nature dependent, more often there is a mismatch between the solar thermal energy availability and requirement. This drawback could be addressed to an extent with the help of thermal energy storage systems combined with solar air heaters. This review article focuses on solar air heaters with integrated and separate thermal energy storage systems as well as greenhouses with thermal storage units. A comprehensive study was carried out in solar thermal storage units consisting of sensible heat storage materials and latent heat storage materials. As the phase change heat storage materials offer many advantages over the sensible heat storage materials, the researchers are more interested in this system. The charging and discharging characteristics of thermal storage materials with various operational parameters have been reported. All the possible solar air heater applications with storage units have also been discussed.

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“…Several studies have been reported experimentally and numerically on air-packed bed thermal storage systems. [17][18][19][20] Lugolole et al 21 experimentally investigated three sensible storage systems having the same geometrical configurations. Two rock bed storage systems having a particle size of 10.5 and 31.9 mm, respectively, were used as a packing material and sunflower oil as heat transfer fluid (HTF).…”

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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Thermal performance comparison of three sensible heat thermal energy storage systems during charging cycles

Cited by 43 publications

References 25 publications

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

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

A review on thermal energy storage systems in solar air heaters

Thermal performance of sensible and latent heat thermal energy storage systems

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