Printed circuit heat exchanger(PCHE) has the characteristics of high temperature and high pressure resistance as well as compact structure

so it is widely used in supercritical carbon dioxide(S-CO_2) Brayton cycle. In this paper

the mathematical model of the PCHE is established by segmental design method. Comparison with the experimental results shows that

the errors of heat load

cooling load

inlet temperature of cold fluid

hot side heat transfer area and hot side flow rate are 2.700%

0.330%

0.634%

0.683% and 2.219%

respectively

which proves the validity of the numerical model. The heat transfer performance and resistance characteristics at different hydraulic diameters

wall thicknesses and inlet temperatures of hot side are compared and analyzed. The results show that

the hydraulic diameter is inversely proportional to the total heat transfer coefficient and pressure drop

and the pressure drop at the cold side is larger than that at the hot side. The wall thickness is inversely proportional to the total heat transfer coefficient

but the pressure drop is not sensitive to the change of wall thickness. The higher the inlet temperature of the hot side

the smaller the total heat transfer coefficient and pressure drop. The research can provide some references for geometric design and thermodynamic properties of PCHE.