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Thermophysical Properties of POLWAX LTP ST Paraffin Doped with or without Carbon Nanotubes or Silver Nanowires and Passive Cooling of a High-Power LED Panel

Author

Listed:
  • Janusz Zmywaczyk

    (Faculty of Mechatronics, Armament and Aerospace, Military University of Technology (MUT), Gen. S. Kaliskiego Street No 2, 00-908 Warsaw, Poland)

  • Piotr Zbińkowski

    (Faculty of Physics, Institute of Experimental Physics, University of Warsaw, Ludwika Pasteura Street No 5, 02-093 Warsaw, Poland)

  • Piotr Koniorczyk

    (Faculty of Mechatronics, Armament and Aerospace, Military University of Technology (MUT), Gen. S. Kaliskiego Street No 2, 00-908 Warsaw, Poland)

Abstract

Commercially available paraffin wax LTP ST, manufactured in Poland by POLWAX, was used as a phase change material (PCM) for passive cooling of an LED panel containing 28 high power light emitting diodes (LEDs). Paraffin wax LTP ST of density ρ = 930 kg·m −3 at room temperature (RT) was chosen over other POLWAX waxes (LUXOLINA, LUXOLINA-ST, and LTP 56-20) because of its melting point range (44.5–55.4 °C), relatively high latent heat of fusion ΔH = 218.8 J·g −1 , high specific heat Cp = 2.11 J·g −1 K −1 and thermal conductivity k = 0.233 Wm −1 K −1 at 0 °C. The thermophysical properties were studied in samples of pure LTP ST paraffin and doped with multi-walled carbon nanotubes (1.99, 3.49, 5.35, and 10.49 wt%, MWCNTs) or silver nanowires (0.26, 0.32, 1.06, 2.10, and 7.35 wt%, SNWs). Analysis of the thermal effects of doped samples showed a relative increase in the degree of subcooling, averaging 100% for MWCNT and 46% for SNW, a relative 15÷25% decrease in enthalpy of melting for MWCNT and 14÷16% for SNW. A 44% increase in thermal conductivity was found for the sample containing 5.35 wt% MWCNTs and a 91% increase for 1.06 wt% SNW. The results of cooling efficiency tests for three types of developed heat sinks fabricated of AW-2017A aluminum alloy are presented, i.e., (a) full system without PCM filling, (b) system with PCM chamber without intracellular ribs, (c) and system with PCM chamber with intracellular fins.

Suggested Citation

  • Janusz Zmywaczyk & Piotr Zbińkowski & Piotr Koniorczyk, 2023. "Thermophysical Properties of POLWAX LTP ST Paraffin Doped with or without Carbon Nanotubes or Silver Nanowires and Passive Cooling of a High-Power LED Panel," Energies, MDPI, vol. 16(16), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:16:p:6068-:d:1220599
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    References listed on IDEAS

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    1. B. Kalidasan & A. K. Pandey & Saidur Rahman & Aman Yadav & M. Samykano & V. V. Tyagi, 2022. "Graphene–Silver Hybrid Nanoparticle based Organic Phase Change Materials for Enhanced Thermal Energy Storage," Sustainability, MDPI, vol. 14(20), pages 1-16, October.
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