Performance optimization analysis of Z-shaped silicon carbide printed circuit heat exchanger. (English)

In order to optimize and analyze the heat transfer and flow performance of Z-shaped silicon carbide printed circuit heat exchanger(PCHE) as a high temperature regenerator, the method of combining numerical simulation and response surface methodology is used to optimize the design with the Nusselt number and Fanning friction coefficient as the response, and the cold fluid pressure, cold fluid inlet temperature, hot fluid inlet temperature, channel bending angle, channel diameter and mass flow rate as the influence factors to determine the optimal structure and process parameters. The results show that the channel bending angle has the highest significance to the Fanning friction coefficient on the response hot side, and the channel diameter has the highest significance to the Nusselt number on the response hot side. It is concluded that when the Z-shaped silicon carbide PCHE is used as a high temperature regenerator, the cold fluid pressure is 30 MPa, the cold fluid inlet temperature is 568.44 K, the hot fluid inlet temperature is 893.813 K, the channel bending angle is 15°, the diameter is 1.769 mm, and the mass flow rate is 349.997 kg/(m² ⋅ s), the flow resistance is the smallest. When the cold fluid pressure is 23.078 MPa, the cold fluid inlet temperature is 541.961 K, the hot fluid inlet temperature is 800.045 K, the channel bending angle is 45°, the diameter is 1.8 mm, the mass flow rate is 350 kg/(m m² ⋅ s), the heat transfer effect is the best. [ABSTRACT FROM AUTHOR]

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