The diffusion coefficient of nickel in an austenitic (fcc structure) stainless steel is 10^-22 m^2/s at 500° c and 10^-15 m^2/s at 1000° c. calculate the activation energy (or more precisely, the activation enthalpy) for the diffusion of nickel in this alloy over this temperature range. calculate also the pre- exponential constant do.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Wiy doeres rere okhn a pump whon working betwon the same pressure range?

What is the main objective of using reheat rankine cycle?