scholarly journals Materials research for passive solar systems: solid-state phase-change materials

1985 ◽  
Author(s):  
D.K. Benson ◽  
J.D. Webb ◽  
R.W. Burrows ◽  
J.D.O. McFadden ◽  
C. Christensen
Keyword(s):  
Solid State ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solar Systems ◽  
Materials Research ◽  
Passive Solar

scholarly journals Reviewing the Exergy Analysis of Solar Thermal Systems Integrated with Phase Change Materials

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 724
Author(s):  
Macmanus Chinenye Ndukwu ◽  
Lyes Bennamoun ◽  
Merlin Simo-Tagne
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Second Law Of Thermodynamics ◽  
Heat Transfer Fluid ◽  
Solar Still ◽  
Thermal Systems ◽  
Solar Systems ◽  
Exergy Balance ◽  
Change Material

The application of thermal storage materials in solar systems involves materials that utilize sensible heat energy, thermo-chemical reactions or phase change materials, such as hydrated salts, fatty acids paraffin and non-paraffin like glycerol. This article reviews the various exergy approaches that were applied for several solar systems including hybrid solar water heating, solar still, solar space heating, solar dryers/heaters and solar cooking systems. In fact, exergy balance was applied for the different components of the studied system with a particular attention given to the determination of the exergy efficiency and the calculation of the exergy during charging and discharging periods. The influence of the system configuration and heat transfer fluid was also emphasized. This review shows that not always the second law of thermodynamics was applied appropriately during modeling, such as how to consider heat charging and discharging periods of the tested phase change material. Accordingly, the possibility of providing with inappropriate or not complete results, was pointed.

A Novel Passive Solar Greenhouse Based on Phase-Change Materials

1987 ◽  
Vol 5 (3) ◽  
pp. 201-212 ◽  
Author(s):  
E. KORIN ◽  
A. ROY1 ◽  
D. WOLF ◽  
D. PASTERNAK ◽  
E. RAPPEPORT
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Solar Greenhouse ◽  
Passive Solar

2 years of monitoring results from passive solar energy storage in test cabins with phase change materials

Solar Energy ◽  
2020 ◽  
Vol 200 ◽  
pp. 29-36 ◽  
Author(s):  
Kemal Cellat ◽  
Beyza Beyhan ◽  
Yeliz Konuklu ◽  
Cengiz Dündar ◽  
Okan Karahan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solar Energy ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solar Energy Storage ◽  
Passive Solar

scholarly journals Photovoltaic Cooling Utilizing Phase Change Materials

2020 ◽  
Vol 160 ◽  
pp. 02004
Author(s):  
Suhil Kiwan ◽  
Hisham Ahmad ◽  
Ammar Alkhalidi ◽  
Wahib O Wahib ◽  
Wael Al-Kouz
Keyword(s):  
Phase Change ◽  
Experimental Test ◽  
Phase Change Materials ◽  
Experimental Tests ◽  
Photovoltaic System ◽  
Cell Temperature ◽  
Average Cell ◽  
Solar Systems ◽  
Pv Panel ◽  
Change Material

A theoretical analysis based on mathematical formulations and experimental test to a photovoltaic system cooled by Phase Change Material (PCM) is carried out and documented. The PCM is attached to the back of the PV panel to control the temperature of cells in the PV panel. The experimental tests were done to solar systems with and without using PCM for comparison purposes. A PCM of paraffin graphite panels of thickness15 mm has covered the back of the panel. This layer was covered with an aluminum sheet fixed tightly to the panel frame. In the experimental test, it was found that when the average cell temperature exceeds the melting point temperature of the PCM, the efficiency of the system increases. However, when the cell temperature did not exceed the melting temperature of the PCM, the use of the PCM will affect negatively the system efficiency.

Synthesis and Characterization of Solid State Phase Change Material Microcapsules for Thermal Management Applications

2013 ◽  
Author(s):  
Fangyu Cao ◽  
Jing Ye ◽  
Bao Yang
Keyword(s):  
Heat Capacity ◽  
Solid State ◽  
Phase Change ◽  
Thermal Management ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Silica Shell ◽  
Heat Transfer Fluid ◽  
Change Behavior

Polyalcohols such as neopentyl glycol (NPG) undergo solid-state crystal transformations that absorb/release sufficient latent heat. These solid-solid phase change materials (PCM) can be used in practical thermal management applications without concerns about liquid leakage and thermal expansion during phase transition. In this paper, microcapsules of NPG encapsulated in silica shell were successfully synthesized with the use of the emulsion technique. The size of the microcapsules was in the range of 0.2–4 μm, and the thickness of the silica shell was about 30 nm. It was found that the endothermic event of the phase change behavior of these NPG-silica microcapsules was initiated at around 39 °C and the latent heat was about 96.0 J/g. A large supercooling of about 43.3 °C was observed in the pure NPG particles without shell. The supercooling of the NPG microcapsules can be reduced to about 14 °C due to the heterogeneous nucleation sites provided by the silica shell. These NPG microcapsules were added into heat transfer fluid PAO to enhance its heat capacity. The effective heat capacity of the fluids can be increased by 56% by adding 20 wt. % NPG-silica microcapsules.

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