Thermal management of high-power LED module with single-phase liquid jet array. (5th February 2021)

• Record Type: Journal Article
• Authors: Gatapova, Elizaveta Ya; Sahu, Gopinath; Khandekar, Sameer; Hu, Run
• Is Part Of: Applied thermal engineering. Volume 184(2021)
• Publication Date: 2021-02-05
• Subjects: LED cooling -- High-power LED module -- Thermal management -- Direct liquid impingement -- Jet array; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2020.116270
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Liquid jet array is shown as a promising active cooling technique for 300 W LED. The system can remove 125 W/cm 2 with module surface temperature kept below 70 °C. The working/operational limits of 300 W LED luminaire module is elucidated. Strong conjugate heat transfer effects and internal thermal gradients are revealed. Maximum heat flux at the junction is three times higher than at the surface. Abstract: Next generation high-power Light–Emitting Diodes (LED) require specialized cooling systems for ensuring performance and reliability. The ability of a multi-jet single-phase liquid cooling system (jet diameter 400 µm) for thermal management of the high-power LED based luminaire is investigated and successfully demonstrated for a 300 W nominal power module. Operating pressure of the jet system is varied in the range of 0–8 bar, leading to coolant water flow rates varying from 65 ml/min to 782 ml/min ( Re = 3833–46 119). With the proposed multi-jet cooling system, the experiments show the possibility of maintaining the module surface temperature well below 70 °C for substrate level heat flux up to ~125 W/cm 2 . We show that the system can still maintain safe operating temperature, without loss of luminous efficiency for input power up to 130% of the nominal design power. Supporting detailed three-dimensional numerical simulations of the conjugate module heat transfer inside the LED package volume are provided. It is concluded that single-phase array of water-based jet flow is an excellent potential option for thermal management of high-power LED luminaire.