Compact Cryogenic Generator for Electronic Applications

Under Phase I the liquefaction rate, refrigerant details, and mass flow rates of a small liquid nitrogen generator manufactured by our Company were measured under different conditions. Using scaling laws derived earlier for designing smaller and smaller microminiature refrigerators we have reversed the process and applied these to the design of a liquefier to meet the much higher desired production rate of the Offering. The projected performance is in good agreement with a similar device documented in the literature. We plan to proceed with the detailed design of the refrigerator components, the manufacture of the parts, advanced machining practices for the heat exchanger, assembly and test of the complete device. We have identified a suitable compressor, the refrigerant and the desired dimensions of the heat exchanger to achieve or come close to the desired production rate. Special consideration will be given to the packaging of the liquefier, use of novel materials of construction for the Dewar, enclosure, and means for purifying the Nitrogen, to meet the size and weight desired. We expect the power consumption to be higher but close to the desired value.