Thermal Conductivity Enhancement of Phase Change Materials for Low-Temperature Thermal Energy Storage Applications

Singh, Randeep; Sadeghi, Sadegh; Shabani, Bahman

doi:10.3390/en12010075

Cited by 82 publications

(37 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A highly diluted aliquot of initial Ag/PEG400 dispersion (containing 1.1 wt%) was studied in a standard 10 mm quartz cuvette. There is still substantial need for further investigative techniques to improve the thermal conductivity of organic PCMs [29]. Thus, the present study aims to develop and characterize stable phase change materials based on poly(ethylene glycol) PEG400 and containing Ag silver nanoparticles as a new stable solution for thermal storage.…”

Section: Nanoparticle and Base Fluid Characterizationmentioning

confidence: 99%

“…In this sense, thermal energy storage (TES) is a useful strategy to address the intermittency of renewable sources and assist an effective utilization of energy by relieving the mismatch between power supply and demand. TES methods are commonly categorized as latent heat using phase change materials There is still substantial need for further investigative techniques to improve the thermal conductivity of organic PCMs [29]. Thus, the present study aims to develop and characterize stable phase change materials based on poly(ethylene glycol) PEG400 and containing Ag silver nanoparticles as a new stable solution for thermal storage.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

et al. 2019

View full text Add to dashboard Cite

The main objective of this study is to design and characterize silver suspensions based on poly(ethylene glycol) PEG400, Ag/PEG400, as energy storage media for low-temperature applications. A polyvinylpyrrolidone (PVP) treatment was applied to ~22 nm silver nanoparticles to ensure good stability in poly(ethylene glycol). An array of different experimental techniques was utilized to analyze the molecular mass and purity of base poly(ethylene glycol), morphology of dry PVP-capped Ag nanoparticles, hydrodynamic average size of dispersed Ag particles, as well as thermal stability of PEG400 and Ag/PEG400 dispersions. Samples exhibited good temporal stabilities with average hydrodynamic diameter around 50 nm according to dynamic light scattering analyses. Melting and solidification transitions were investigated in terms of temperature and enthalpy from differential scanning calorimeter (DSC) thermograms. The thermophysical characterization was completed with thermal conductivity (k), dynamic viscosity (η), isobaric heat capacity (Cp), density (ρ), and surface tension (σ) measurements of designed materials using a Hot Disk thermal conductivimeter, a rotational rheometer, a DSC calorimeter working with a quasi-isothermal modulated method, a U-tube densimeter and a drop shape analyzer, respectively. For a nanoparticle loading of only 1.1% in mass, sub-cooling reduced by 7.1% and thermal conductive improved by 3.9%, with almost no penalization in dynamic viscosity (less than 5.4% of increase). Maximum modifications in Cp, ρ, and σ were 0.9%, 2.2%, and 2.2%, respectively. Experimental results were compared with the values provided by using different theoretical or semi-empirical equations. In particular, good descriptions of dynamic viscosity as functions of temperature and nanoparticle volume concentration were obtained by using the Vogel–Fulcher–Tammann equation and a first-order polynomial η( ϕ v , n p ) correlation, with absolute average deviations of 2.2% and 0.55%, respectively.

show abstract

Section: Nanoparticle and Base Fluid Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

et al. 2019

View full text Add to dashboard Cite

show abstract

“…One of the most important weaknesses of PCMs is their low thermal conductivity that affects their function in energy storage devices in terms of rate of thermal charging and discharging. As extensively studied before [14][15][16][17][18][19][20][21][22], application of extended surfaces such as fins is one of the methods that can address this problem. The thermal conductivity of metal fins is far higher than PCMs that help increase the heat transfer rate between the heat transfer fluid (HTF) and the PCM.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

et al. 2020

Self Cite

View full text Add to dashboard Cite

In the present study, a triplex-tube, employing fin-enhanced phase change materials (PCMs), as a thermal energy storage (TES) system was studied numerically. The main flaw of the PCMs is their low thermal conductivity that restricts their effectiveness for energy storage applications. Metallic (copper) fins are added to the geometry of the system to improve their function by extending the heat transfer area. The effects of the presence, configuration, and dimensions of copper fins were investigated to understand the best design for minimizing the solidification time and achieving the best performance enhancement for the TES system selected for this study. The results revealed that the best performance belonged to fins with a mix configuration, with an attachment angle of 90° and the length and width of 28 mm and 1 mm, respectively. Using this configuration could reduce the required time for complete solidification by around 42% compared to the system without fins. Moreover, it was concluded that increasing the length of the fin could offer its positive effect for enhancing the performance of TES system up to an optimal point only while increasing the width showed a diverse influence. Furthermore, the angles between the tube surface and the fin direction were investigated and 90° was found to be the best choice for the TES case selected in this study. In addition, placement of the fins on the surface of internal or external tube or mix method did not show a significant effect while placing the fins on the external surface of the tube showed even a negative impact on the performance of the TES system compared with when no fins were applied.

show abstract

“…A total TES process includes at any rate three stages: charging, putting away and releasing. The articles are altogether centered around one point, for example, materials study [4]- [6], execution strength [7]- [9], position improvement, PCM-based structure heat recuperation, and vitality sparing impacts [10]. The principle climatic districts and scope scopes of PCM application in the building and the types of PCM application and the main physical properties in different climates locales the CaCl2•6H2O Calcium chloride hexa hydrate (PCM) has chosen.…”

Section: Fig 1 Graphical Description Of Phasementioning

confidence: 99%

Computational Fluid Dynamics of Roof Top using PCM for Efficient Thermal Management

Prakash*,

Saravanan,

Victoria A.K

et al. 2019

IJITEE

View full text Add to dashboard Cite

This paper presents a simulated parametric study to investigate the thermal management of the roof panel using phase change materials (PCM). The warmth engrossing and expelling ability of PCM is utilized to regulate the warmth produced in the room. A single and double layer of the PCM was kept between the roof and concrete. The energy saving level has noted on particular time without PCM materials, the same method as performed with single layer PCM and double layer PCM. Along these lines, it's exceedingly important to improve the warm presentation, so as to accomplish the objective of vitality sparing. So the Thermal Energy Storage (TES) is perhaps the most ideal approaches to improve thermal execution of building. The major classifications of the heat energy storage are practical and dormant. This paper is focused on one point such as PCM materials with to reduce the heat generated inside the room. CFD is seen as a superior substitute in present day ventures and has the capacity of taking care of such difficult issues. From the assistance of CFD, relative examinations are produced to consider the accompanying cases, for example, Case 1: Concrete piece with rooftop top section off without PCM. Case 2: Concrete slab with roof top slab off with single layer PCM. Case 3: Concrete slab with roof top slab off with Double layer PCM. The relative temperature design inside the room is utilized to comprehend the warm solace in the room and the upsides of utilizing PCM.

show abstract

Thermal Conductivity Enhancement of Phase Change Materials for Low-Temperature Thermal Energy Storage Applications

Cited by 82 publications

References 56 publications

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

The Effects of Fin Parameters on the Solidification of PCMs in a Fin-Enhanced Thermal Energy Storage System

Computational Fluid Dynamics of Roof Top using PCM for Efficient Thermal Management

Contact Info

Product

Resources

About