Review of latent thermal energy storage systems for solar air‐conditioning systems

Dong, Yu; Liu, Yanfeng; Wang, Dengjia; Wang, Yingying; Du, Hu; Liu, Jiaping

doi:10.1002/er.4960

Cited by 21 publications

(10 citation statements)

References 179 publications

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“…97 Methods for enhancing the charge-release rate of the PCM also include methods such as adding metal foam and nanoparticles to the PCM. 98 Zhang et al 99 added EG to paraffin to prepare composite PCM with higher thermal conductivity. Through…”

Section: Pcms Used In Stcsmentioning

confidence: 99%

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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This article reviews the design of solar phase-change energy storage systems and their applications in residential buildings. The solar thermal collection system has high heat collection efficiency, no pollution, and it is also widely used in the field of building heating. In order to improve the efficiency of the solar collector system, the researchers found that integrating phase-change materials (PCMs) into the solar thermal collector system can achieve this goal, but there will be a problem of PCM leakage. Some researchers have solved this problem by microencapsulating PCMs, the thermal conductivity and energy storage efficiency of the PCMs after microencapsulation will be greatly affected. Adjusting the solar collector to an appropriate inclination angle can achieve the highest heat collection efficiency. Choosing the PCM in the appropriate temperature zone can improve the system efficiency. For the separated solar collector system, the parts that need to be considered include the type of heat exchanger, the structure of the energy storage heat exchanger, the shape of the heat exchanger fins, the type of solar collector, and so on. All in all, coupling PCM into the solar collector system can improve energy efficiency reduce carbon emissions and have good economics, the maximum internal rate of return of solar collectors integrated with PCMs in residential and industrial applications is 22% and 17.2%.

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Section: Pcms Used In Stcsmentioning

confidence: 99%

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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“…These merits lead to great potentials of PCMs in both compact thermal device designs 2 and smooth temperature outputs. 3 Application examples of PCMs include high-temperature thermal energy storage (TES) for concentrated solar power (CSP) 4 and industrial waste heat recovery, 5 medium-to-low temperature TES for domestic hot water, 6 house heating, 7 and solar airconditioning, 8 along with thermal management for electronics, 3 smart textiles, 9 spacecraft, 10 and the food industry. 11 In latent heat TES, a PCM has to be heated over its melting point, thus it can melt, and the charged thermal energy can be isothermally stored as latent heat during the heat storage/melting process; while the PCM has to be cooled and undergoes solidifying, so that the stored thermal energy can be extracted for later use during the heat recovery/solidification process.…”

Section: Introductionmentioning

confidence: 99%

“…These merits lead to great potentials of PCMs in both compact thermal device designs and smooth temperature outputs . Application examples of PCMs include high‐temperature thermal energy storage (TES) for concentrated solar power (CSP) and industrial waste heat recovery, medium‐to‐low temperature TES for domestic hot water, house heating, and solar air‐conditioning, along with thermal management for electronics, smart textiles, spacecraft, and the food industry …”

Section: Introductionmentioning

confidence: 99%

How mushy zone evolves and affects the thermal behaviours in latent heat storage and recovery: A numerical study

et al. 2020

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Summary Mushy zone is where the melting or solidification actually begins and proceeds, accompanying which the latent heat absorbs or releases. Thus, it is critical for the realization of latent heat storage. In this paper, attempts were made to examine the melting and solidification processes from a new perspective, that is, the mushy zone evolution, which tightly couples with the heat transfer, fluid flow, and phase change. A conjugate heat transfer model was developed including the lauric acid in a basic rectangular latent heat storage unit, the surrounded thermal insulations, and the ambient air. The enthalpy‐porosity model was used and the mushy zone constant was reasonably evaluated to accurately predict the solid‐liquid phase change processes. The model was validated against the experimental data from literature. In addition, a detailed description on the coupling of heat transfer, fluid flow, and phase change within the mushy zone was presented. It has been found that the mushy zone was highly suppressed during melting while widely extended during solidification. Moreover, the effects of the isothermal assumption for non‐isothermal phase transition as well as mushy zone constant on the predicted heat storage performance were investigated. The results obtained can give some insights into the enthalpy‐porosity method to accurately predict the mushy zone phase change processes. Meanwhile, more clues can be achieved to design more efficient heat storage devices and to develop better phase change materials.

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“…Microcapsule encapsulation technique can effectively prevent leakage, enhance thermal conductivity, increase thermal and chemical stability and improve compatibility in the field of energy storage applications. [1][2][3] Currently, the widely used inorganic shells possess excellent thermal stability and thermophysical properties compared with organic shells. [4][5][6] Researchers try to develop inorganic shells through in-situ polymerization and interfacial polymerization methods, [7][8][9] including silicon dioxide (SiO 2 ), 10,11 zinc oxide (ZnO), 12,13 titanium dioxide (TiO 2 ), 11,14 zirconium oxide (ZrO 2 ) 15 and cuprous oxide (Cu 2 O).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the microstructures and thermal properties of SiO ₂ @ NaNO ₃ microcapsule thermal storage materials

Chen

Cheng

et al. 2020

Int J Energy Res

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In this paper a novel SiO 2 @NaNO 3 microcapsule thermal storage material is successfully fabricated via water-limited sol-gel method. The effects of SiO 2 nanoparticles on the microstructures, thermal conductivity, specific heat capacity, latent heat and thermal stability are investigated. SEM and TEM investigation indicates that the spherical SiO 2 nanoparticles with an average diameters of 30 nm are coated on the surface of NaNO 3 evenly to form a homogeneous and stable core-shell structure. Microencapsulated composites are characterized by XRD and FTIR to determine the chemical compositions and structures. The thermal conductivity of SiO 2 @NaNO 3 microcapsules is significantly enhanced by 62.9% (0.756 W m −1 K −1) compared with 0.464 W m −1 K −1 of that of NaNO 3. In addition, the latent heat, phase change temperature, specific heat capacity and thickness of shell of the microencapsulated NaNO 3 with 18.1 wt% SiO 2 were 310.1 C, 144.7 J g −1 , 1.831 J/(gÁK), and 80-150 nm, respectively. Furthermore, microencapsulated NaNO 3 have excellent shape and thermal stability at working temperature range. SiO 2 nanoparticles are uniformly attached to the modified NaNO 3 by electrostatic interaction to create a physical protective SiO 2 barrier, which can effectively inhibit the leakage and cauterization of melting NaNO 3. K E Y W O R D S microencapsulated composites, NaNO 3 , novel sol-gel method, SiO 2 nanoparticles, thermal properties

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Review of latent thermal energy storage systems for solar air‐conditioning systems

Cited by 21 publications

References 179 publications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

How mushy zone evolves and affects the thermal behaviours in latent heat storage and recovery: A numerical study

Study on the microstructures and thermal properties of SiO ₂ @ NaNO ₃ microcapsule thermal storage materials

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Review of latent thermal energy storage systems for solar air‐conditioning systems

Cited by 21 publications

References 179 publications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

How mushy zone evolves and affects the thermal behaviours in latent heat storage and recovery: A numerical study

Study on the microstructures and thermal properties of SiO 2 @ NaNO 3 microcapsule thermal storage materials

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Study on the microstructures and thermal properties of SiO ₂ @ NaNO ₃ microcapsule thermal storage materials