Szczegóły publikacji

Opis bibliograficzny

Cement composites with expanded graphite/paraffin as storage heater / Maksymilian FRĄC, Waldemar PICHÓR, Paulina SZOŁDRA, Wojciech SZUDEK // Construction and Building Materials ; ISSN 0950-0618. — 2021 — vol. 275 art. no. 122126, s. 1–10. — Bibliogr. s. 9–10, Abstr. — Publikacja dostępna online od: 2021-01-07


Autorzy (4)


Słowa kluczowe

electric propertiesresistance heating elementsexpanded graphitecement based compositesphase change materialparaffinthermal energy storage

Dane bibliometryczne

ID BaDAP132202
Data dodania do BaDAP2021-01-19
Tekst źródłowyURL
DOI10.1016/j.conbuildmat.2020.122126
Rok publikacji2021
Typ publikacjiartykuł w czasopiśmie
Otwarty dostęptak
Czasopismo/seriaConstruction and Building Materials

Abstract

The following paper presents the results of research on cement composites with expanded graphite/paraffin in terms of their application in accumulative heating systems. A novel approach, using expanded graphite simultaneously as an electric conductive and as a phase-change additive, is presented. A complex additive was prepared by means of the impregnation of expanded graphite (EG) with paraffin through porous grains. The EG/paraffin grains were added to cement composites in a ratio of 10–30 wt% of cement. The surface temperature of the composites with EG/paraffin during self-heating was measured to evaluate their heat generation capability. Changes in the surface temperature of the sample and the air temperature in the heat chamber compared to the reference sample were measured during self-heating and cooling to determine thermal storage capability. Thermal and mechanical reliability after 50 cycles of accelerated heating was investigated. The results show that cement composites with EG/paraffin are able to generate high power (even 25.7 kW/m2) and possess high heating rate, enabling their use with voltages as low as 10 V. These composites are also capable of maintaining a desirable air temperature in heat chamber for a longer period of time. The air temperature in the heat chamber during the cooling process of the composite with EG/paraffin was about 1.0 °C higher than the reference sample after 50 min. Moreover, these composites are characterized by thermal and mechanical reliability. The results revealed that the cement composites with EG/paraffin could be effectively used in accumulative surface heating systems.

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artykuł
Cement composites with expanded graphite as resistance heating elements / Maksymilian FRĄC, Waldemar PICHÓR, Paulina SZOŁDRA // Journal of Composite Materials ; ISSN 0021-9983. — 2020 — vol. 54 iss. 25, s. 3821–3831. — Bibliogr. s. 3830–3831, Abstr. — Publikacja dostępna online od: 2020-04-16
artykuł
Determination of percolation threshold in cement composites with expanded graphite by impedance spectroscopy / Waldemar PICHÓR, Maksymilian FRĄC, Marta RADECKA // Cement and Concrete Composites ; ISSN 0958-9465. — 2022 — vol. 125 art. no. 104328, s. 1–8. — Bibliogr. s. 7–8, Abstr. — Publikacja dostępna online od: 2021-11-06