Cryogenic Closed Loop Cooling

Cryogenic closed loop cooling systems are indispensable tools in modern science and technology, offering the ability to achieve and maintain extremely low temperatures, often below −123ºC (−190ºF) or 150 K. Their importance lies primarily in creating the precise thermal environments necessary for sensitive research, manufacturing, and diagnostic applications. Unlike open-loop systems that consume costly, volatile cryogens like liquid nitrogen or helium, closed-loop systems are highly efficient and cost-effective because they continuously recapture and reuse the working gas. This lack of continuous cryogen consumption makes them ideal for long-duration or remote operations and dramatically reduces logistical burdens and operational costs.

Stirling Cryogenics Closed Loop Systems

These cryogenic cooling systems have diverse and critical uses across various fields, a versatility understood well by Stirling Cryogenics. We apply our technology through specialized closed loop systems based on using two common cryogens, helium and nitrogen, coupled with our Stirling Cryocoolers. Our closed loop helium cooling systems use a pressurized, cold gaseous helium loop to circulate cooling power down to approximately 18 K. This technique “decouples” the cooler from the application, making it perfect for cooling superconducting magnets, space simulation testing, instrumentation, and thermal shielding. Separately, our closed-loop liquid nitrogen (LN2​) systems are designed to capture and re-liquefy nitrogen gas that would otherwise be wasted as vent gas, offering superior energy efficiency for applications like cooling high-temperature superconducting cables, thermal vacuum chambers, and cryotherapy chambers. The ability of these closed-loop systems to provide stable, precise, and sustainable deep cooling makes them a fundamental part of technical innovation.