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Energy and exergy analysis of a hybrid active-passive PV cooling system with MgO-enhanced PCM, metallic microchannels, and TEGs

Author

Listed:
  • Phukaokaew, W.
  • Suksri, A.
  • Intaniwet, A.
  • Punyawudho, K.
  • Paphapote, T.
  • Wongwuttanasatian, T.

Abstract

Photovoltaic thermal (PVT) systems, which convert solar energy into both electricity and heat, face performance challenges due to rising temperatures. Phase change materials (PCMs) offer thermal storage benefits but suffer from low thermal conductivity. To address this, lauric acid (LA) was enhanced with magnesium oxide (MgO) nanoparticles, forming MgO-enhanced phase change material (MgO-PCM). A novel container with micro-channels and eight interconnected water tubes was designed to improve heat transfer and electrical efficiency. Waste heat from the PV module is absorbed by the MgO-PCM and transferred to the water tubes. A thermoelectric generator (TEG) further converts excess heat from the water outlet into electricity. System performance was tested at tilt angles of 15°, 30°, 45°, and 60°, using an optimized inlet water flow (Re = 5500). Results indicated that a 15° tilt offered the best performance. Compared to an uncooled PV system, the PVT system achieved a 29.08% increase in electrical efficiency, 70% thermal energy recovery, 82.49% overall efficiency, and 12.78% exergy efficiency.

Suggested Citation

  • Phukaokaew, W. & Suksri, A. & Intaniwet, A. & Punyawudho, K. & Paphapote, T. & Wongwuttanasatian, T., 2026. "Energy and exergy analysis of a hybrid active-passive PV cooling system with MgO-enhanced PCM, metallic microchannels, and TEGs," Renewable Energy, Elsevier, vol. 265(C).
    • Handle: RePEc:eee:renene:v:265:y:2026:i:c:s0960148126004763
    DOI: 10.1016/j.renene.2026.125651
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