Question

Thermodynamics

1. Saturated liquid H20 at 16 MPa is fed into the boiler of a variant of a Carnot cycle (but simplified Rankin cycle) where the working fluid is not an ideal gas. Saturated H20 vapor is fed into the turbine of the same turbine. The condenser of this turbine is operated at 8 kPa. The mass flowrate of the H20 in this cycle is 7.2x103 kg/min. Draw the path of this process on T-s diagram. Estimate the thermal efficiency of the cycle, net power produced in kW, and rate of heat rejection in the condenser 2. The steam leaves the steam generator of a Rankin cycle is at 793 K and 100 bar, and it expands to 1 bar at the exit of turbine of isentropic efficiency 81%, Saturated water leaves the condenser and is compressed to 100 bar by a compressor of 78% isentropic efficiency. Cooling water enters the condenser at 15°C with a mass flow rate of 114.80 kg/s. Assuming the cycle has a net power output 3 MW, estimate the overall thermal efficiency of the cycle and the temperature of the cooling water leaving the condenser

Answer 1

wr Tunoine ag. IN TMR From seem tvkle we get at Pent① T=41.51 ℃ Aetua人 'Pw mpng, precess is not Iso enhape. ss 1S tso ewh

2 A 25 70.8 *a.k) At Point gxf Ta 41-51と 211 y

H3-142. ー(164 g-7-1-3.85) 2530.8 1449.7) ニー 1、58 ncomec