Kleemenko Coolers
General-purpose Kleemenko Coolers
These low-cost refrigerator systems use a single-stream, throttle-expansion cycle of a mixture of refrigerants and have been used over the past decade to provide stable, maintenance-free temperature control between 65K and 150K.
Kleemenko coolers are closely related to Joule-Thomson coolers. In J-T cooling, compressed gases pass down a counter-current heat exchanger before being allowed to expand through a capillary or throttling valve. Cooling occurs upon expansion and the cool gas passes back up the heat exchanger, pre-cooling the incoming high-pressure gas. In the Kleemenko cycle it is not a gas that expands, but rather a mixture of gas and liquid. One or more liquid-vapor separators may be incorporated into the cycle so the expansion of the liquid can be used to pre-cool the vapor.
MMR’s general-purpose Kleemenko cooler systems come with a cold head that can be integrated into a variety of applications and instrumentation settings, making this a very flexible system. MMR’s general-purpose Kleemenko cooler systems, or custom variations of them, have been used for the cryo-acceleration of workstations, low-noise amplifiers for communication equipment, and X-ray detectors, to name a few applications.
Bio 080 and Bio 120 Kleemenko Coolers
MMR’s Bio models of Kleemenko coolers are closed-cycle cryogenic refrigeration systems that are low-cost, zero-maintenance and designed for the storage of frozen tissue, cell cultures, organs and body parts. These stand-alone cooler systems can be operated continuously at temperatures from ambient to below -150ºC, providing a stable and controlled cryogenic environment.
Bio model cryocooler systems are ready for benchtop operation. The systems include a top-loading cooling chamber and a dipping cup for safe, easy operation — you never have to personally handle cryogens.
Proof of Performance
One of MMR’s customers, Ortec, features our Kleemenko coolers on their website and discusses the systems’ performance. If you’re evaluating Kleemenko coolers, you are sure to find this very informative.
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