Phase change characteristic study of spherical PCMs in solar energy storage

Veerappan, M.; Kalaiselvam, S.; Iniyan, S.; Goić, Ranko

doi:10.1016/j.solener.2009.02.006

Cited by 93 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, other technical difficulties may arise during cycling and the additive may become ineffective after some cycles [73,78]. For instance, the use of [53,54] 187 [18,27] 191e212 [51,52] 209 [48,49] 213.12 [50] 163 [48,49] 88 [48,49] 134 [48,49] 257 [48,49] Energy …”

Section: Supercooling or Undercoolingmentioning

confidence: 99%

“…The adsorption quantity is even higher than 100 wt% (weight percent) with ammonia [24] because 1 mol of calcium chloride can adsorb 8 mol of ammonia [25]. -A relatively higher thermal conductivity, whether in solid or liquid state, compared to other materials of the same kind [26,27]. -A better thermal [1,16] and chemical stability [15] than other salt hydrates -A less corrosiveness than other salt hydrates [16,28] -A high latent heat of fusion (hexahydrate) [15] -A small volume change during phase transition [15] -Non-toxicity [29] -In sorption processes, it can be paired with different refrigerants (water, ammonia, methylamine, methanol, ethanol: see Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A review on the use of calcium chloride in applied thermal engineering

N’Tsoukpoe¹,

Rammelberg²,

Fopah-Lele³

et al. 2015

Applied Thermal Engineering

109

View full text Add to dashboard Cite

Section: Supercooling or Undercoolingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review on the use of calcium chloride in applied thermal engineering

N’Tsoukpoe¹,

Rammelberg²,

Fopah-Lele³

et al. 2015

Applied Thermal Engineering

109

View full text Add to dashboard Cite

“…Salt hydrates have desirable characteristics of a higher density of 1640 kg/m 3 [90]; negligible (less than 1%) volume changes during phase change [91,92]; cheaper availability with an average cost of $0.13-0.20/kg for calcium chloride [93,94]; higher heat of fusion of up to 296 kJ/kg [95]; higher thermal conductivity of 0.6 W/m·K [96]; and favorable transition temperatures in the range of 25 • C-34 • C [97]. The salt hydrates are abundantly available [98] in large quantities as by-products of industrial processes [95,99] and as waste co-products in many chemical processes including the production of soda ash [100].…”

Section: Salt Hydratesmentioning

confidence: 99%

Micro-Encapsulated Phase Change Materials: A Review of Encapsulation, Safety and Thermal Characteristics

2016

View full text Add to dashboard Cite

Phase change materials (PCMs) have been identified as potential candidates for building energy optimization by increasing the thermal mass of buildings. The increased thermal mass results in a drop in the cooling/heating loads, thus decreasing the energy demand in buildings. However, direct incorporation of PCMs into building elements undermines their structural performance, thereby posing a challenge for building integrity. In order to retain/improve building structural performance, as well as improving energy performance, micro-encapsulated PCMs are integrated into building materials. The integration of microencapsulation PCMs into building materials solves the PCM leakage problem and assures a good bond with building materials to achieve better structural performance. The aim of this article is to identify the optimum micro-encapsulation methods and materials for improving the energy, structural and safety performance of buildings. The article reviews the characteristics of micro-encapsulated PCMs relevant to building integration, focusing on safety rating, structural implications, and energy performance. The article uncovers the optimum combinations of the shell (encapsulant) and core (PCM) materials along with encapsulation methods by evaluating their merits and demerits.

show abstract

“…Simulations have typically used the finite volume method or finite difference approximation, including both conduction and convection [17][18][19][20][21], typically with a constant temperature in the external surface of the capsule. The volume change has been typically considered in different forms, e.g., placed in an external reservoir [19,[22][23][24] or in contact with an external opening [25], and the effect of its initial position has been studied [26].…”

Section: Introductionmentioning

confidence: 99%

“…Experimental studies, on the other hand, have used transparent capsules to monitor the solid fraction of PCM [19,25,31,32], as well as temperature probes in different positions within the capsule [18,33,34]. The results typically show good agreement between simulations and experiments [20,[35][36][37], albeit in ideal conditions. However, these studies consider a capsule in a thermostated fluid, either at flowing [22,26,34] or (almost) at rest [18,19].…”

Section: Introductionmentioning

confidence: 99%

Simulations of Melting of Encapsulated CaCl2·6H2O for Thermal Energy Storage Technologies

et al. 2017

View full text Add to dashboard Cite

Abstract:We present in this work simulations using the finite difference approximation in 2D for the melting of an encapsulated phase-change material suitable for heat storage applications; in particular, we study CaCl 2 ·6H 2 O in a cylindrical encapsulation of internal radius 8 mm. We choose this particular salt hydrate due to its availability and economic feasibility in high thermal mass building walls or storage. Considering only heat conduction, a thermostat is placed far from the capsule, providing heat for the melting of the phase-change material (PCM), which is initially frozen in a water bath. The difference in density between the solid and liquid phases is taken into account by considering a void in the solid PCM. A simple theoretical model is also presented, based on solving the heat equation in the steady state. The kinetics of melting is monitored by the total solid fraction and temperatures in the inner and outer surfaces of the capsule. The effect of different parameters is presented (thermostat temperature, capsule thickness, capsule conductivity and natural convection in the bath), showing the potential application of the method to select materials or geometries of the capsule.

show abstract

Phase change characteristic study of spherical PCMs in solar energy storage

Cited by 93 publications

References 14 publications

A review on the use of calcium chloride in applied thermal engineering

A review on the use of calcium chloride in applied thermal engineering

Micro-Encapsulated Phase Change Materials: A Review of Encapsulation, Safety and Thermal Characteristics

Simulations of Melting of Encapsulated CaCl2·6H2O for Thermal Energy Storage Technologies

Contact Info

Product

Resources

About