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Adding Cryogenic Boost cooling to a mechanically refrigerated chamber is practical when low temperatures, within the range of refrigeration cooling (–50 to –80), need to be held for extended periods, but where the transition speed from hot to cold needs to be greater than can be provided by refrigeration alone (typically 2 to 7 °C/min).
Boosted systems are typically employed to allow fast cooling rates, to tolerate large mass loads, and to allow the use of smaller refrigeration compressors to lower both initial purchase cost, and lower power requirements, heat rejection, and system noise.
With boost, transition speeds can reach 20 to 80 °C/min (transition speed and
lowest available temperature is dependant upon the coolant type (L–C02
or L–N2
)
used and the capacity of the boost system. Transition speeds and cooling
efficiencies in boosted chambers will not equal that of the normal Cryogenic chamber (This is largely due to the refrigeration evaporator which
impedes the circulation of air in the chamber and adds mass to the static load).
Boosted chambers can also be used reach temperatures as low as –100°C, below the capabilities of a mechanical refrigeration system. However, as operating the refrigeration system when these very low temperatures are present in the chamber is inherently risky for the compressor(s), such operations are discouraged unless attended by very competent personnel made fully aware of the risks, and the risk avoidance procedures required.
Adding the Boost option consists of a number of modifications to a chamber to allow for the addition of cryogenic valves and injectors. The exact nature of these modifications will be determined by your Sigma sales engineer based upon a review of your requirements.
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