Inferometric Continuous Emission Monitor for Active Contrl of Organic Emissions

Not Available A new approach for fabricating high performance low temperature regenerators for use in advanced cryocoolers near and below 10K is proposed. Solid regenerator cartridges with microchannel structure (MCS) made of magnetic lanthanide-rich materials (e.g. Er(sub 3)Ni) are suggested instead of traditional regenerator beds packed with spheres. A regenerator cartridge with a microchannel structure offers the best design for cryocoolers because it has the highest ratio of heat transfer area to pressure drop. Its effectiveness is 20 to 25% higher than that of regenerator beds packed with spheres. Lack of technology for fabricating regenerators with microchannel structures from brittle magnetic intermetallics have prevented their use in the past. This project deals with a novel patented fabrication technique for making multichannel regenerators from brittle intermetallic compound Er(Sub 3)Ni, which exhibits sharp rise in heat capacity at temperatures slightly below 10K. The fabrication technique includes the co-extrusion of fine Er(sub 3)Ni powders together with a polymer binder and filler. It offers a possibility to fabricate cryocooler regenerator cartridges from brittle magnetic intermetallics with a controlled surface area and a low fluid flow resistance. The mechanical stability of MCS regenerators is expected to be much better than that of the beds packed with spherical particles. It is anticipated that the cost of manufacture using the MCS technology will be significantly lower because of much higher yields.