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Numerical investigation on thermal performance and flow characteristics OFZ and S shape PCHE using S-CO2

ABSTRACT
As a high-efficiency compact heat exchanger, the printed circuit heat exchanger (PCHE) has been widely applied into nuclear reactor and energy industry. In the present paper, the thermal-hydraulic performance of PCHE based on S-CO2 Brayton power cycle has been numerically investigated for various channel shape and bend angle. A total of seven different shaped channels including straight, Z-10, Z-20, Z-30, S-10, S-20, S-30 are modeled, and evaluated according to the heat transfer and friction performances within the Re of 5000-30000. The inlet temperature/outlet pressure of hot channel and cold channel are 553 K/2.6 MPa and 381 K/8.5 MPa, respectively. The flow patterns, average Nu, friction factor f and heat exchanger effectiveness η are obtained. On the comprehensive consideration of heat transfer enhancement and friction, the S-20 channel produces the best thermal performance. This investigation has provided important reference data for the design of advanced PCHE in the energy industry.
KEYWORDS
PAPER SUBMITTED: 2018-06-20
PAPER REVISED: 2018-09-28
PAPER ACCEPTED: 2018-11-15
PUBLISHED ONLINE: 2019-03-31
DOI REFERENCE: https://doi.org/10.2298/TSCI180620090L
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