Thermophysical properties and performance characteristics of paraffin heat-accumulating materials

The article deals with the problems of using paraffins-by-products of utilization of oil raw materials of Kazakhstan as a heat-accumulating material for fencing structures of buildings. Physical and chemical properties of paraffins and their narrow fraction are investigated. On the basis of mixing commodity and liquid paraffins, as well as mixing n-alkanes, heat-accumulating materials with a melting point of 250C were obtained and samples were made for testing. The component composition and physical and chemical properties of the developed heat storage materials are investigated. The possibility of obtaining heat-accumulating materials of a given property based on liquid and solid paraffins is justified. The thermophysical properties of the developed heat storage materials are systematically investigated. It was found that materials obtained by mixing individual n-alkanes have stable thermophysical characteristics. It is shown that the sum of the melting enthalpy and phase transition in the crystal state of heat-accumulating materials based on paraffins depends on the width of the fractional composition of heat-accumulating materials and the purity of the n — alkane content; from the fractional composition; from the content of the number of even and odd n-alkanes and their ratio. The shrinkage of     the developed heat-accumulating materials during crystallization and expansion during melting, depending on the temperature, is investigated. The dependence of shrinkage of heat-accumulating materials on temperature is obtained and their shrinkage coefficients on temperature are analyzed.

Keywords: paraffins, heat storage materials, heat storage, heat engineering properties, enthalpy, fraction, phase transition, n-alkanes.
For citation:

Aimbetova I.O., Suleimenov U.S., Khadzaragova E.A., Alkatsev M.I. Thermophysical properties and performance characteristics of paraffin heataccumulating materials. MIAB. Mining Inf. Anal. Bull. 2020;(11-1):6-17. [In Russ]. DOI: 10.25018/0236-1493-2020-111-0-6-17.

Acknowledgements:
Issue number: 11
Year: 2020
Page number: 6-17
ISBN: 0236-1493
UDK: 665.637.7+547.21+541.11
DOI: 10.25018/0236-1493-2020-111-0-6-17
Article receipt date: 26.05.2020
Date of review receipt: 28.06.2020
Date of the editorial board′s decision on the article′s publishing: 10.10.2020
About authors:

Aimbetova I.O.1, Cand. Sci. (Eng.), Assistant Professor, e-mail: science@ayu.edu.kz,
Suleimenov U.S.1, Cand. Sci. (Eng.), Assistant Professor.
Khadzaragova E.A.2, Dr. Sci. (Eng.), Professor.
Alkatsev M.I.2, Dr. Sci. (Eng.), Professor.
1 Khoja Akhmet Yassawi International Kazakh-Turkish University, 161200, Turkestan, Kazakhstan,
2 North Caucasian Institute of Mining and Metallurgy (State Technological University), 362021, Vladikavkaz, Russia.

 

For contacts:

I.O. Aimbetova, e-mail: e-mail: science@ayu.edu.kz.

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