R$-134$a in a refrigeration cycle enters the condenser at $200$F$,280$ psia and leaves as a saturated liquid. The flow rate of the refrigerant is $2\mathrm{.}2$ lbm$/$s$.$ The refrigeration unit operates on a day when the outside temperature is $90$F$.$ The energy from the condenser is discharged not to the atmosphere, but to a large reservoir of water at $130$F$.$

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a$.)$ What is the change in flow exergy for the R$-134$a between inlet and outlet of the condenser?

b$.)$ What is the rate of exergy destruction in the condenser?