Global Digital Central Logo Frontiers in Heat and Mass Transfer (FHMT)

Available at www.ThermalFluidsCentral.org
Journal Cover Page

THERMAL PERFORMANCE OF LOW-COST COOLING SYSTEMS FOR TRANSMIT/RECEIVE MODULES OF PHASED ARRAY ANTENNAS WITH AND WITHOUT GRAVITY HEAT PIPES

Yu. E. Nikolaenko, D. V. Pekur, V. Yu. Kravets, V. M. Sorokin, D. V. Kozak, R. S. Melnyk, L. V. Lipnitskyi, A. S. Solomakha
Frontiers in Heat and Mass Transfer (FHMT) 18 - 23 (2022)


Abstract


This study compares thermal characteristics of two design versions of a new low-cost air-cooling system with a standard heat sink profile and built-in flat heat pipes of a simple design with a similar cooling system design without the heat pipes. The aim of the work is to determining the thermal characteristics and choosing the most effective option in a practical context. Using computer simulation in the Solidworks Flow Simulation standard software package allowed determining how the temperature of 8 transistors with a total power of 224 W was affected by changes in air velocity from 1 to 30 m/s, effective thermal conductivity from 1 to 30 kW/(m∙°C), and the number of heat pipes from 8 to 16 pieces. It was determined that the maximum temperature decrease for the transistors is observed in the velocity range from 1 to 10 m/s for all the studied cooling system designs. Using 8 HPs with effective thermal conductivity of 5 kW/(m∙°C) allowed lowering the maximum temperature value on the mounting surface by 22.56°C (from 85.03 to 62.47°C) and reducing surface temperature unevenness more than twice - from 55.7 to 25.93°C). Increasing the effective thermal conductivity of the heat pipes from 1 to 10 kW/(m∙°C) reduced the temperature of the hottest transistor by 15 - 20°C, depending on the system design version. Further increase of the effective thermal conductivity to 30 kW/(m∙°C) reduced the temperature by only 1 - 2°С. Doubling the number of the heat pipes from 8 to 16 did not significantly improve the thermal characteristics of the transistors (by 3.3 - 2.8°С). When the air velocity was increased from 1 to 10 m/s, the total thermal resistance decreased most significantly for the cooling system with 8 heat pipes, namely from 0.179 to 0.068°C/W, while for the version with 16 heat pipes it decreased from 0.164 to 0.054°C/W. Thus, the cooling system with 8 heat pipes with an effective thermal conductivity of up to 10 kW/(m∙°C) and an air velocity in the heat sink channels from 1 to 10 m/s proves to be best suited for practical use in T/R modules.

Full Text: PDF
DOI: http://dx.doi.org/10.5098/hmt.18.23

ISSN: 2151-8629