Investigation on Flow Maldistribution and Thermo-Hydraulic Performance of PCHEs with Spoiler Perforated Boards

Wei Wang (), Mengke Niu, Yufei Tan, Bingxi Li and Yong Shuai
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Wei Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Mengke Niu: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yufei Tan: School of Environment, Harbin Institute of Technology, Harbin 150001, China
Bingxi Li: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yong Shuai: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2022, vol. 15, issue 18, 1-15

Abstract: In this study, the effects of the maldistribution coefficient on the thermo-hydraulic performance of discontinuous fin printed circuit heat exchanger (DF-PCHE) entrance head and channels are numerically investigated. To improve the flow uniformity at the entrance head, the flow in the exchanger with three types of spoiler perforated boards (SPBs) having 3 × 3, 4 × 4, and 5 × 5 holes and three kinds of hole diameters ( Φ d = 30, 25, and 20 mm), respectively, are compared to the flow in an exchanger with no SPB. The results show that a small maldistribution coefficient for the inlet velocity field is beneficial for the thermo-hydraulic performance of the DF-PCHE channels, and a maldistribution coefficient of 0.7 is an acceptable velocity distribution for the PCHE channel inlet. Using the 3 × 3 SPB with Φ d = 30 mm, the maldistribution coefficient becomes 0.7, the fastest among all the SPB application cases at Δ L = 150 mm. Moreover, its heat transfer coefficient and pressure drop increase by 22.46% and decreases by 47.2% compared to those of the exchanger without SPB, respectively.

Keywords: printed circuit heat exchanger; entrance head; maldistribution coefficient; thermo-hydraulic performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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