trol valve pi qc = output of controller q h qi q s qv S Ti To V2 V, LJTERATURE CITED Fussell, J. B., and W. E. Vesely, "A New Methodology for Obtaining Cut Sets for Fault Trees," Trans. Am. Nucl. SOC., 15, 262 ( 1972). Fussell, J. B., "Synthetic Tree Model-A Formal Methodology for Fault Tree Construction," ANCR-1098, Available from = actuating pressure of cooling water control valve = material gow rate to heat exchanger = inflow rate of material to be cooled = output of temperature sensor = flow rate of cooling water = internal mode of temperature sensor = temperature of material into heat exchanger = temperature of material out of heat exchanger = internal mode of cutoff valve = internal mode of cooling water control valveThe concentration profiles in a countercurrent hollow fiber bundle mass exchanger dialyzer is derived, assuming a uniform distribution of fibers in the dialyzer shell. Mass transfer coefficients are obtained as a function of fiber packing density, membrane thickness, membrane material, and solute tYPe* (1949), and Vyazovov (1940) have measured rates of abcal Engineers, 1979.