A steady-state heat transfer model of a micro-channel parallel flow loop heat pipe was established based on the distributed parameter model. Model feasibility was verified experimentally

with a maximum relative error of 10.5%. The simulation study analyzed the influences of the filling ratios and the height difference between the evaporator and the condenser on the heat transfer performance of the loop heat pipe. The results showed that the optimal filling ratios of the loop heat pipe were 80%–105.4%

and the heat transfer capacity was 1.27–1.36 kW; when the height difference between the evaporator and condenser increased from 0.4 m to 1.0 m

the heat transfer capacity increased by approximately 8.7%. The model predicted the unevenness of the evaporator flow distribution and the two-phase state inside the flat tube

improving the accuracy of the simulation results. This study can be used as a reference for the structural design of micro-channel parallel flow loop heat pipes.