$5\mathrm{.}13$ Exergetic Losses of River$-$cooled Power Plant Condenser

A part flux of a river at initially $17C$ is used to cool down an otherwise adiabatic condenser at a working

temperature of $60C,$ completely condensing saturated steam $m_s^{}=100\frac{kg}{s}$ at isobaric conditions. The

exiting flux of river water is heated to $18C,$ rhe ambient temperature is $20C.$

Calculate the exergetic loss ${?}^7.$