The heat transfer performance of a heat pipe using acetone as working fluid is experimentally studied and discussed in this paper. A novel heat pipe array was designed and expected to be utilized in integrated waste heat recovery equipment with higher heat transfer efficiency at lower temperature heat sources. The device is composed of five vertical evaporation sections which are connected at the bottom

and a horizontal concentric tube condensing section. The heat transfer performance of a new type of thermosiphon waste heat recovery unit was analyzed by theoretical and experimental methods

and the structural parameters of the device were optimized. The influence of inclination angle of 15°~90°

operation temperature of 40~80 ℃ and cooling water temperature of 10~30 ℃ on heat transfer performance of the device was studied. It is found that the new gravity heat pipe waste heat recovery device has good isothermal performance and operation stability. When the liquid filling ratio is 15%

the inclination angle is 60°

the cooling water temperature is 30℃

the heat exchanger reaches the best working state. The maximum heat transfer rate is about 1 700 W

and the average thermal resistance is 0.042 ℃/W.