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The dramatically rising cost of hydrocarbon fuel in recent years has reemphasized industry attention to high thermal efficiency for its pipeline compressor drive gas turbine engines. The advent of a new stainless steel plate-fin industrial regenerator has made possible greatly improved gas turbine thermal efficiency, compact installation, and long life. The selection of the optimum match of regenerator effectiveness and pressure drop with engine characteristics is discussed together with the size and cost impact of these parameters. New design features are developed that ensure historical regenerator problems are handled effectively.Copyright © 1977 by ASME

Reactions between Co(II), bis(diphenylphosphino)methane (dppm) and either NaBH4 or NaBH3CN have been studied. They follow pathways which are in marked contrast to those followed by Ph2P(CH2)nPPh2 (n=2−6) in the presence of NaBH4 in which the final product is normally CoH(phosphine)2 although binuclear BH4-bridged complexes may sometimes be obtained. The products obtained with dppm are Co2X3(dppm)2 (X=Cl,Br) (I), CoCl(dppm)3 (II), {CoHX(dppm)2}Y (X=Cl, Br, I, BH3CN; Y=Cl,BH3CN,BPh4,Clo4) (III), and Co2H2(dppm)3 (IV). While a binuclear A-frame structure can be proposed for the Co(I)-Co(II) species (I), crystal twinning has so far prevented an X-ray determination. However, X-ray studies on (II) and (IV) have shown that (II) contains tetrahedral Co(I) to which one chloro and three monodentate dppm ligands are attracted while (IV) is a binuclear species containing bridging dppm ligands and two terminal hydrides. The compounds (III) are octahedral Co(III) complexes. Possible mechanisms for the formatio...