When selecting a heat pipe heat exchanger, the temperature ranges of the heat source and cold source must first be confirmed. The heat pipe operating temperature should be lower than the critical temperature of its working fluid and higher than the freezing point, to avoid a decline in heat transfer performance.
Gravity-assisted heat pipes must be kept vertical or at an inclination angle of no less than 15 degrees to ensure condensate return. For horizontal installation, heat pipes with capillary wicks should be selected, or auxiliary return structures should be added.
When used in environments with combustible gases, the wiring cavity may use an explosion-proof structure, and a temperature controller can be built in as needed. The temperature sensor should be installed at a representative position on the evaporation section or condensation section of the heat pipe.
Commonly used shell materials are copper, aluminum, and stainless steel, while working fluids can include water, ethanol, ammonia, etc. The combination should be determined based on the corrosiveness of the medium, operating temperature, and compatibility test data to avoid the generation of non-condensable gases.
Regularly inspect dust accumulation on the outer wall of the heat pipes, fin deformation, and sealing conditions. If the temperature difference of a single heat pipe is found to increase significantly, its vacuum degree should be tested or it should be replaced. During design, space for maintenance and temperature measurement points should be reserved.
