The displacer-type pulse tube cryocooler employs a displacer for phase adjustment and the recovery of acoustic power

resulting in the potential for high refrigeration efficiency. Currently

there is a lack of research on highly-efficient displacer-type pulse tube cryocoolers with large cooling capacity around -100 ℃. In this paper

we present the design of a hundred-watt displacer-type pulse tube cryocooler applied in low-temperature freezers and experimentally assess its performance

with a particular focus on displacer motion and compressor efficiency. Based on a validated numerical model

we analyze the coupling relationship between the pulse tube and the compressor

as well as the internal phase relationship of the cold finger. It is observed that

when operating with a charging pressure of 3.0 MPa

a frequency of 64.9 Hz

a cooling water temperature of 20 ℃

and an input electrical power of 500 W

the displacer-type pulse tube cryocooler can provide 160.3 W of cooling capacity at -100 ℃

achieving a relative Carnot efficiency of 22.2 %. Meanwhile

the displacer leads the compressor by 59 °

the internal phase distribution of the pulse tube is deemed to be rational

and the coupling between the compressor and the cold finger exhibits a satisfying compressor efficiency of 78 %. This cryocooler stands as the most efficient displacer-type pulse tube cryocooler around -100 ℃.