1. Steam with a quality of 1.00 enters the turbine of a Rankine cycle power plant at 400. psia and exits at 1.00 psia. Neglecting pumping power, determine the Rankine cycle isentropic thermal efficiency.
2. Determine the decrease in Carnot and isentropic Rankine cycle thermal efficiencies if the condenser is removed from the engine discussed in text given Example and the steam is allowed to exhaust directly into the atmosphere at 14.7 psia. Assume the cycles are still closed loop.
Example :
In the 1890s, the Lancashire Steam Motor Company (now called British Leyland) manufactured the lawn mower, which was powered by a Rankine cycle steam engine. If it had a superheated boiler outlet state of 100. psia and 500.°F, and a condenser pressure of 1.00 psia, then find
a. The degree of superheat at the boiler outlet.
b. The equivalent Carnot cycle thermal efficiency of the lawn mower.
c. The isentropic Rankine cycle thermal efficiency of the lawn mower.