Numerical Study on Thermal-Hydraulic Performance of a Two-Sided Etched Zigzag-Type High-Temperature Printed Circuit Heat Exchanger
First page number:
Last page number:
The thermal-hydraulic performance of a two-sided etched zigzag-type printed circuit heat exchanger is numerically investigated at high temperature of 900°C and high pressure above 7 MPa. It is found the global non-dimensional parameters at high temperature and high pressure is significantly related to the operating condition, but the local pitch-averaged non-dimensional parameters can be used to predict the thermal-hydraulic performance of printed circuit heat exchanger in a wide operating condition. The additional elliptical upper channel can improve the heat transfer of printed circuit heat exchanger, but increase its pressure drop simultaneously. Compared to the baseline design without elliptical upper channel, the Nusselt number in the modified model with upper channel d=0.234 mm is increased by 7%-17%, while the Fanning friction factor is increased by 5%-12%. However, the Nusselt number in the modified model with upper channel d=0.512 mm is only increased by 3%-5% and the Fanning friction factor is only increased by 5%-6% compared to the modified model with upper channel d=0.234 mm. © 2017 The Author(s).
Numerical Study on Thermal-Hydraulic Performance of a Two-Sided Etched Zigzag-Type High-Temperature Printed Circuit Heat Exchanger.
Energy Procedia, 142