Phase Change Materials for Thermal Peak Management Applications with Specific Temperature Ranges

2018 ◽  
Author(s):  
Jacob Maxa ◽  
Andrej Novikov ◽  
Mathias Nowottnick ◽  
Matthias Heimann ◽  
Kay Jarchoff
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Peak ◽  
Temperature Ranges ◽  
Specific Temperature

Thermal and Electrical Performance Analysis of a Novel Medium Concentration Dual Photovoltaic System for Different Phase Change Materials

2020 ◽  
Author(s):  
Arshmah Hasnain ◽  
Jawad Sarwar ◽  
Qamar Abbas ◽  
Muhammad Azeem Younas ◽  
Konstantinos E. Kakosimos
Keyword(s):  
Performance Analysis ◽  
Phase Change ◽  
Work Performance ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Photovoltaic System ◽  
Electrical Performance ◽  
Current Configuration ◽  
Four Seasons ◽  
Temperature Ranges

Abstract In this work, performance analysis of a medium concentrated photovoltaic system employing two mono-facial cells is carried out using a validated finite element based coupled optical, electrical, and thermal model. The environmental conditions of Lahore, Pakistan are considered, and the system is thermally regulated with a phase change material. Nine commercially available phase change materials (PCM) having melting temperature ranges between 41–65°C are selected. These PCMs include LA, RT47, S-series salt, ClimSel™ C48, STL47, RT54, RT60, RT62, and RT64. Temperature regulation, melt fraction, thermal and electrical efficiency are determined for each material for four months of January, March, July, and September representing four seasons of a year. The comparison of the materials has shown that S-series salt and C48 melt completely during the day and regenerate to solid-phase during night in the whole year except January. But S-series salt is found to be most suitable in current configuration due to its higher overall efficiency over the whole year.

scholarly journals Investigation of Lactones as Innovative Bio-Sourced Phase Change Materials for Latent Heat Storage

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1300 ◽  
Author(s):  
Rebecca Ravotti ◽  
Oliver Fellmann ◽  
Nicolas Lardon ◽  
Ludger Fischer ◽  
Anastasia Stamatiou ◽  
...  
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Scanning Calorimetry ◽  
Latent Heat Storage ◽  
Chemical Structures ◽  
Wide Range ◽  
Temperature Ranges ◽  
Change Temperature

In the presented work, five bio-based and bio-degradable cyclic esters, i.e. lactones, have been investigated as possible phase change materials for applications in latent heat storage systems. Commercial natural lactones such as ε-caprolactone and γ-valerolactone were easily purchased through chemical suppliers, while 1,2-campholide, oxa-adamantanone and dibenzochromen-6-one were synthesized through Baeyer-Villiger oxidation. The compounds were characterized with respect to attenuated total reflectance spectroscopy and gas chromatography coupled with mass spectroscopy, in order to confirm their chemical structures and identity. Subsequently, thermogravimetric analysis and differential scanning calorimetry were used to measure the phase change temperatures, enthalpies of fusion, degradation temperatures, as well to estimate the degree of supercooling. The lactones showed a wide range of phase change temperatures from −40 °C to 290 °C, making them a high interest for both low and high temperature latent heat storage applications, given the lack of organic phase change materials covering phase change temperature ranges below 0 °C and above 80 °C. However, low enthalpies of fusion, high degrees of supercooling and thermal degradations at low temperatures were registered for all samples, rendering them unsuitable as phase change materials.

scholarly journals Mapping Crystallization Kinetics of Phase-Change Materials Over Large Temperature Ranges Using Complementary In Situ Microscopy Techniques

2018 ◽  
Vol 24 (S1) ◽  
pp. 1868-1869
Author(s):  
Victoriea L. Bird ◽  
Al J. Rise ◽  
Khim Karki ◽  
Daan Hein Alsem ◽  
Geoffrey H. Campbell ◽  
...  
Keyword(s):  
Phase Change ◽  
Crystallization Kinetics ◽  
Phase Change Materials ◽  
Large Temperature ◽  
Temperature Ranges ◽  
Microscopy Techniques ◽  
Kinetics Of

Phase Change Materials as a Modifier of Ageing Cement Concrete in Hot and Dry Climate

2013 ◽  
Vol 804 ◽  
pp. 129-134 ◽  
Author(s):  
Mahmoud Hsino ◽  
Jerzy Pasławski
Keyword(s):  
Middle East ◽  
Phase Change ◽  
Air Temperature ◽  
Large Amplitude ◽  
Phase Change Materials ◽  
Cement Concrete ◽  
Thermal Peak

This paper is devoted to the use of Phase Change Materials as a cement concrete modifier in Middle East climate. Due to large amplitude of daily air temperature in these conditions, Phase Change Materials can be used to reduce the dynamic of thermal peak in an ageing concrete. Partial results of studies to determine the influence of various factors on the effects of modifications are presented

scholarly journals Storage Capacity in Dependency of Supercooling and Cycle Stability of Different PCM Emulsions

2021 ◽  
Vol 11 (8) ◽  
pp. 3612
Author(s):  
Stefan Gschwander ◽  
Sophia Niedermaier ◽  
Sebastian Gamisch ◽  
Moritz Kick ◽  
Franziska Klünder ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Melting Temperatures ◽  
Dsc Measurements ◽  
Storage Media ◽  
Crystallisation Behaviour ◽  
Temperature Ranges ◽  
The Stability

Phase-change materials (PCM) play off their advantages over conventional heat storage media when used within narrow temperature ranges. Many cooling and temperature buffering applications, such as cold storage and battery cooling, are operated within small temperature differences, and therefore, they are well-suited for the application of these promising materials. In this study, the storage capacities of different phase-change material emulsions are analysed under consideration of the phase transition behaviour and supercooling effect, which are caused by the submicron size scale of the PCM particles in the emulsion. For comparison reasons, the same formulation for the emulsions was used to emulsify 35 wt.% of different paraffins with different purities and melting temperatures between 16 and 40 °C. Enthalpy curves based on differential scanning calorimeter (DSC) measurements are used to calculate the storage capacities within the characteristic and defined temperatures. The enthalpy differences for the emulsions, including the first phase transition, are in a range between 69 and 96 kJ/kg within temperature differences between 6.5 and 10 K. This led to an increase of the storage capacity by a factor of 2–2.7 in comparison to water operated within the same temperature intervals. The study also shows that purer paraffins, which have a much higher enthalpy than blends, reveal, in some cases, a lower increase of the storage capacity in the comparison due to unfavourable crystallisation behaviour when emulsified. In a second analysis, the stability of emulsions was investigated by applying 100 thermal cycles with defined mechanical stress at the same time. An analysis of the viscosity, particle size and melting crystallisation behaviour was done by showing the changes in each property due to the cycling.

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