Note: For the following problems, choose an appropriate reference atmosphere,

and neglect potential and kinetic energy effects.

$2\mathrm{.}2$ lbm of air, initially at $200F,50a,$ undergoes two processes in series. For

each process, determine the change in exergy.

a$)$ An isothermal process to a pressure of $10$ psia., followed by:

b$)$ A constant pressure process to a temperature of $-10F.$

c$)$ For the process of Part b above, calculate the work transport of exergy.