ULT (Ultra Low Temperature) Cold Room Conditioning Systems

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Ultra Low Temperature (ULT) cold rooms can be used for short, medium or long term cold temperature storage of diverse materials from pharmaceuticals to ice core samples. ULT cold rooms typically have a storage temperature of between -80° C to -86° C. Cascade or "two stage" refrigeration plants are most commonly used to achieve these ultra low temperatures. Single stage or compound systems can be used to reach practical temperatures as low -50°C. The CRCS or Cold Room Conditioning System consists of a 1st or high stage, a 2nd or low stage and an evaporator/air handler assembly. The 1st and 2nd stages can be located in the same physical package inside the facility or split with the 1st stage located outside the facility. The spilt system approach rejects the bulk of the heat energy removed from the cold room to the outdoors thereby reducing the heat that must be removed by the facility climate control system. For non-critical storage applications a single cascade plant may be sufficient. In critical storage applications, a secondary back-up cascade plant is supplied to mitigate the chance of material loss due to plant failure. In extremely critical storage applications an LN2 cooled loop can be added to provide a tertiary back-up system. The secondary and tertiary systems can also be used to deliver faster recovery when high energy loads are encountered such as when a large amount of new material is added to the cold room.

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