Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5444083 | Cryogenics | 2017 | 6 Pages |
Abstract
Expansion work is generally wasted as heat in a pulse-tube cryocooler and thus represents an obstacle to obtaining higher Carnot efficiency. Recovery of this dissipated power is crucial to improvement of these cooling systems, particularly when the cooling temperature is not very low. In this paper, an efficient cascade cryocooler that is capable of recovering acoustic power is introduced. The cryocooler is composed of two coolers and a displacer unit. The displacer, which fulfills both phase modulation and power transmission roles, is sandwiched in the structure by the two coolers. This means that the expansion work from the first stage cooler can then be used by the second stage cooler. The expansion work of the second stage cooler is much lower than the total input work and it is thus not necessary to recover it. Analyses and experiments were conducted to verify the proposed configuration. At an input power of 1249Â W, the cascade cryocooler achieved its highest overall relative Carnot efficiency of 37.2% and a cooling power of 371Â W at 130Â K. When compared with the performance of a traditional pulse-tube cryocooler, the cooling efficiency was improved by 32%.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Jingyuan Xu, Jianying Hu, Jiangfeng Hu, Ercang Luo, Limin Zhang, Bo Gao,