Q$4.$ A PWR operates at a thermal power of $3,025MW.$ Water enters the reactor at $284C$ and flows through the reactor at a rate of $62{10}^{6}k\frac{g}{h}r.$ The system pressure is $15\mathrm{.}5$ MPa. At what temperature does the coolant leave the reactor? $($Hint: Use enthalpy difference. Also in this constant $P$&$V$ case, you may use internal energy difference$)$