Cost-Effective Acoustic-Stirling Cryocooler with Flexibly Attached Remote Coldhead

New approaches for practical cryogenic refrigeration are needed to realize the benefits of high-temperature superconductivity in the electrical power grid infrastructure. Current approaches do not provide sufficient reliability, efficiency, cost, and interface needed to support superconducting transformers, transmission lines, and other devices in commercial service. This project will combine the reliability and efficiency of acoustic-Stirling technology with the universality and adaptability of coldfinger interfaces to achieve capacities of direct usability in superconducting power systems. In Phase I, the mechanical design for new remote coldheads was completed, the production cost and reliability of coolers using that head were evaluated, and performance simulation models were executed. The models were validated by testing against an existing miniature remote-head cooler. It was determined that this cooler type can approach or meet the cost goal ¿ as well as the reliability, capacity, and efficiency ¿ required for superconducting power systems. Phase II will build and test the coolers designed in Phase I for superconducting transformers and transmission lines. One machine will be submitted for long-term testing. Commercial applications & Other Benefits as described by the awardee: The new coolers should deliver cold or liquid cryogen at less cost than traditional truck-and-store distribution (where applicable) and enable new uses where traditional distribution is unworkable (e.g., shipboard power electronics cooling). In addition to superconductivity, applications should include industrial gas liquefaction and recondensation, power electronics cooling, and general scientific cryogenics.