Cold Cycle Dilution and Superfluid Joule-Thomson Refrigerator

将研制一种新型超低温制冷机——超流体焦耳-汤姆逊制冷机（SJTR）。SJTR是一种单相制冷机，可以在零重力和地面环境中使用。预计它可以提供0.5开尔文(K)的冷却温度。SJTR使用冷（~ 1k）超泄漏旁路活塞压缩机压缩3He- 4he液体混合物中的3He成分。在SJTR循环中，压缩后的3He由压缩机排出，并通过逆流热交换器到达超泄漏旁路节流阀。混合物的3He成分在通过节流阀时冷却，流体用于吸收热负载的热量。3He组件通过逆流热交换器回温至压缩机温度。3He在压缩机中再次压缩，继续循环。该项目将包括冷压缩机的开发和超流体焦耳-汤姆逊概念的演示。

A new ultra low temperature refrigerator, the superfluid Joule-Thomson refrigerator (SJTR), will be developed. The SJTR is a single-phase refrigerator that can be used in zero gravity as well as terrestrial environments. It is projected to provide cooling to temperatures of 0.5 Kelvin (K). The SJTR uses a cold (~1 K) superleak-bypassed piston compressor to compress the 3He component of a 3He-4He liquid mixture . In the SJTR cycle, the compressed 3He is discharged by the compressor and passed through counterflow heat exchangers to a superleak bypassed throttle. The 3He component of the mixture cools as it passes through the throttle and the fluid is used to absorb heat from a thermal load. The 3He component is warmed back up to the compressor temperature by passing back through the counterflow heat exchanger. The 3He is then recompressed in the compressor where it continues back through the cycle. The project will include the development of the cold compressor and a demonstration of the superfluid Joule- Thomson concept.