Thermal energy storage characteristics of packed bed encapsulating spherical capsules with composite phase change materials

Sun, Baizhong; Liu, Zhongze; Ji, Xiang; Gao, Long; Che, Deyong

doi:10.1016/j.applthermaleng.2021.117659

Cited by 55 publications

(13 citation statements)

References 42 publications

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“…At the same time, a group of researchers consisting of Sun et al 29 conducted on the thermal energy storage characteristics of a compacted layer encapsulating spherical capsules with phase transition composites. Scientists paid attention to the fact that when calculating the thermal transmittance of two different media, the possibilities of creating mathematical calculation models that consider the resistance to the heat flux process should be considered.…”

Section: Discussionmentioning

confidence: 99%

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

Gendelis

2023

Heat Trans

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The importance of accurately determining the thermal transmittance factor for the outer walls of timber‐framed buildings is the driving force behind this research. This calculation is necessary for heating and cooling load determination, as well as energy consumption assessment. This research aims to conduct an analytical comparison, through both experimental and calculated means, of thermal conductivity coefficients of materials employed in the construction of buildings and structures. The methodological approach adopted in this research is grounded on an experimental analysis of the thermal transmittance of the outer wall materials in timber‐framed buildings. Thermal conductivity measurements with a Hot Plate apparatus by ISO 8302 and thermal conductivity calculations using mathematical software were the primary experimental methods deployed during the research. The results of this study demonstrate differences between experimental and calculated thermal transmittance values for timber‐framed outer walls. Moisture inconsistent distribution throughout the material is the reason behind these discrepancies, calling for particular humidity corrections in the calculations, varying across different materials. While working with simplified calculations of timber‐framed outer wall structures, monitoring the uneven heat flow in I‐beam joints is paramount and should be coupled with humidity‐related material changes. This study's practical implications are that the results can be implemented when calculating the energy consumption of building structures and the heating‐cooling load they entail.

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Section: Discussionmentioning

confidence: 99%

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

Gendelis

2023

Heat Trans

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“…The inorganic slats as non‐paraffinic PCM are found more suitable for medium‐temperature energy storage due to being non‐flammable, cost‐effective, higher heat of fusion, and good thermal conductivity. However, inorganic salts' corrosive effect and phase deposition are significant challenges 21,24 . The characteristics of NaNO 2 and NaNO 3 are listed in Table 2.…”

Section: Schematic Layoutmentioning

confidence: 99%

“…The aforesaid literature better advocates PCM encapsulation for solar thermal energy storage for different heating applications; however, only a few have incorporated PCM encapsulation for domestic heating applications. Although, Sun et al 21 modeled a solar energy‐based PCM‐encapsulated packed bed TES system for residential heating applications using a composition of palmitic acid, expanded graphite, and carbon fiber. Still, much scope exists to incorporate sustainable, non‐toxic, and cost‐effective PCM candidates in encapsulated PB‐TES for space heating applications.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of PCM‐encapsulated solar thermal energy storage system for space heating

Soni,

Reddy,

Reddy

2023

Energy Storage

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In this study, a phase change material (PCM)‐encapsulated packed‐bed thermal energy storage (PB‐TES) system is intended for Day‐round space heating in the winter. Solar concentric collectors act for day‐time heating and TES charging, while the stored energy can be used at night and intermediate time for space heating. A region‐wise techno‐economic analysis of PCM candidates is made to compare the costs and sizes of solar collectors and PB‐TES. A spherical capsule filled with sodium nitrite (NaNO2) and sodium nitrate (NaNO3) is numerically investigated during the PCM charging at constant thermal input. After complete liquefication, the charging time for NaNO2 and NaNO3 capsules is 3280 and 4300 s, respectively, holding the maximum stored energy of 733.4 KJ/kg at 285°C and 687.27 kJ/kg at 310.12°C, respectively. In addition, the stored exergy is obtained 238.78 and 234.74 kJ/kg for NaNO2 and NaNO3, respectively; however, the average exergetic effectiveness for NaNO2 and NaNO3 are 0.54 and 0.46. Despite the lower energy storage capacity (kJ/kg) of NaNO3, the PB‐TES volume is less with NaNO3 than with NaNO2 due to higher density. However, the average cost ($/tonne) of NaNO3 PCM is 50% higher than NaNO2. Subsequently, the thermal efficiency of the proposed system is estimated at 27.68% and 26.94% during day and night‐time operations.

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“…3 Latent thermal energy storage has the advantages of stable temperature, high latent heat, and no chemical reaction compared with thermochemical energy storage methods, and has thus attracted the attention of many scholars. 4 Solid-liquid phase change materials have been widely used because of their high thermal storage density, a wide range of phase change temperatures, and relatively small volume changes during the phase change process. 5 However, the susceptibility of phase change materials (PCMs) to leakage after melting and the low thermal conductivity largely limit their thermal storage performance.…”

Section: Introductionmentioning

confidence: 99%

Palmitic acid/expanded graphite/CuS composite phase change materials toward efficient thermal storage and photothermal conversion

Huo

Yan

et al. 2023

Dalton Trans.

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Thermal energy storage characteristics of packed bed encapsulating spherical capsules with composite phase change materials

Cited by 55 publications

References 42 publications

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

Modeling and analysis of PCM‐encapsulated solar thermal energy storage system for space heating

Palmitic acid/expanded graphite/CuS composite phase change materials toward efficient thermal storage and photothermal conversion

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