A heat engine rejects heat to the atmosphere. The temperature of the atmosphere is 80 F. Saturated liquid water enters the boiler at a rate of 1000 lbm/hour with pressure of 250 psia. The water exits the boiler as a saturated vapor at the same pressure. If heat is supplied to the engine from a nuclear reactor with a temperature of 450 F, determine the maximum rate at which the engine can produce net work in horsepower (hp)