Effectiveness of heat protection of fabrics loaded with phase change materials

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Elham Fallahi ◽  
Mohammad Barmar ◽  
Mohammad Haghighat Kish
Keyword(s):  
Heat Transfer ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Phase Change ◽  
Phase Change Materials ◽  
Chemical Nature ◽  
Woven Fabrics ◽  
Temperature Changes ◽  
Heat Protection ◽  
Exponential Relation

AbstractAmong different natural and non-corrosive products paraffin wax and camel fat are selected as phase change materials (PCM). These PCMs are applied to glass, polyester/viscose and wool/polyester woven fabrics. To examine their efficacy, their thermal behavior in a condition similar to the actual end uses is measured. Chemical nature and thermal properties of the PCMs are measured by Fourier transform infrared spectroscope and differential scanning calorimeter. A relation based on the principle of heat transfer is used to determine the temperature of a thermometer covered by fabrics loaded with PCMs. A simple exponential relation explains the experimental results. For glass and polyester/viscose fabrics use of these PCMs leads to substantial delays in the temperature changes. The important parameters for the evaluation of the products are discussed.

The Experimental Research and Numerical Simulation on Thermal Properties of Molten Salt at Melting Point

2009 ◽  
Author(s):  
Yannan Liang ◽  
Jiemin Zhou ◽  
Ying Yang ◽  
Ye Wu ◽  
Yanyan He
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Phase Change ◽  
Molten Salts ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Phase Interface ◽  
Measuring System ◽  
Solid Liquid

The use of phase-change materials for latent heat storage is a new type of environmentally-friendly energy-saving technologies. Molten salts, one kind of phase-change materials, which have high latent heats, and whose phase transition temperatures match the high temperatures of heat engines, are the most widely used high-temperature phase-change heat storage materials. However, the heat transfer at solid/liquid phase interface belongs to Micro/Nanoscale Heat transfer, lots of the thermal properties of molten salt at melting point is difficult to test. In this investigation, based on the theory that the thermal conductivity can be determined by measuring the speed of the propagation of the solid/liquid phase interface during phase change, a set of system is developed to investigate the thermal conductivity of molten salts at liquid/solid phase transformation point. Meanwhile, mathematical calculation is applied to intuitively simulate the melting and solidifying process in the phase change chamber, by which the error could be analyzed and partly corrected and the result precision could also be increased. And a series of verification experiments have been performed to estimate the precision and the applicability of the measuring system to evaluate the feasibility of the method and measuring system. This research will pave the way to the follow-on research on heat storage at high temperature in industry.

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