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Phase transition temperature ranges and storage density of paraffin wax phase change materials
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9556-552X
2004 (English)In: Energy, ISSN 0360-5442, Vol. 29, no 11, 1785-1804 p.Article in journal (Refereed) Published
Abstract [en]

Paraffin waxes have been used in many latent thermal energy storage applications because of their advantageous thermal performances. In this paper, the liquid-solid phase diagram of the binary system of tetradecane and hexadecane has been used to obtain information of the phase transition processes for cool storage applications. The analysis of the phase diagram indicates that, except for the minimum-melting point mixture, all mixtures melt and freeze in a temperature range and not at a constant temperature. The latent heat of fusion evolves throughout this temperature range. Differential scanning calorimetry (DSC) was used to determine the thermophysical properties of the binary system. Depending on the DSC settings throughout the measurements, varying results were obtained. For example, when the DSC runs at a high heating/cooling rate, it will lead to erroneous information. Also, the correct phase transition temperature range cannot be obtained simply from DSC measurement. By combining phase equilibrium considerations with DSC measurements, a reliable design method to incorporate both the heat of phase change and the temperature range is presented.

Place, publisher, year, edition, pages
2004. Vol. 29, no 11, 1785-1804 p.
Keyword [en]
thermal-energy storage, differential scanning calorimetry, latent-heat storage, system, wallboard
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-23665DOI: 10.1016/ 000223454200008ScopusID: 2-s2.0-3442899690OAI: diva2:342364
QC 20100525 QC 20110923Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-23Bibliographically approved

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