N.P. Williams

ORCID: 0000-0003-2082-048X
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About
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Research Areas
  • Advanced Battery Technologies Research
  • Advanced Battery Materials and Technologies
  • Advancements in Battery Materials
  • Thermal properties of materials
  • Advanced Thermoelectric Materials and Devices
  • Thermal Expansion and Ionic Conductivity
  • Innovative Energy Harvesting Technologies
  • Advanced DC-DC Converters
  • Fluid Dynamics and Turbulent Flows
  • Fluid Dynamics and Heat Transfer
  • Particle Dynamics in Fluid Flows

Trinity College Dublin
2017-2024

The thermal and electrical performance of lithium-ion batteries subjected to liquid immersion cooling conditions in a dielectric fluid has been experimentally investigated this study. A single 26650 LiFePO4 cylindrical cell is completely immersed Novec 7000 charged discharged at onerous maximum rates up 4C 10C, respectively, where C can be defined as the measure rate which or relative its rated capacity. Immersion offers high heat transfer from cell's surface, particular when saturation...

10.1016/j.est.2023.108636 article EN cc-by Journal of Energy Storage 2023-08-16

The thermal management of a lithium-ion battery module subjected to direct contact liquid immersion cooling conditions is experimentally investigated in this study. Four 2.5 Ah 26650 LiFePO4 cylindrical cells square arrangement and connected electrically parallel are completely immersed the dielectric fluid Novec 7000. electrical behaviour assessed at charging discharging rates 1C 4C. Experiments conducted with initially ambient temperature liquid, resulting single phase natural convection...

10.1016/j.est.2024.111289 article EN cc-by Journal of Energy Storage 2024-03-23

The successful thermal management of lithium-ion batteries as used in electric vehicles is crucial maximizing their performance and lifespan. Direct contact liquid cooling, particular two-phase immersion viewed a potential means providing enhanced heat transfer homogenization within battery pack. This study experimentally investigates the 26650 cylindrical cell completely immersed dielectric fluid under both single cooling. discharged at increasing rates up to maximum 8C, with high-speed...

10.1109/therminic57263.2022.9950646 article EN 2022-09-28

Direct contact liquid immersion cooling is receiving increased attention as a potential battery thermal management method. This method offers greater cell homogenization and pack performance through enhanced rates of heat transfer. However, limited published literature exists on this method, particularly module arrangements. study presents an experimental investigation consisting four LiFePO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML"...

10.1109/itherm55368.2023.10177593 article EN 2023-05-30

Abstract Thermal cycling is known to adversely affect the performance and lifespan of thermoelectric generators (TEGs) yet has received limited attention date. The current study experimentally investigates effect thermal on twelve nominally identical TEG modules. Six samples were subjected same cycle profile with an average heating time 154 s examine variation in their outputs. maximum temperature was varied between 170 °C 190 for a further six investigate set-point performance. Degradation...

10.1007/s00231-022-03280-5 article EN cc-by Heat and Mass Transfer 2022-09-01

Abstract The effect of thermal cycling on thermoelectric generator (TEG) performance is investigated for six nominally identical samples subjected to the same heating cycle profile. All TEGs experienced degradation, with maximum power outputs between 28 % and 49 pre-cycling values a post-cycling decrease in dimensionless figure merit ZT 21 %. Sudden significant reductions subsequent internal resistance increases were observed all samples, indicative damage structure arising from material...

10.1088/1742-6596/2116/1/012087 article EN Journal of Physics Conference Series 2021-11-01
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