In a steam power plant, superheated steam at 10MOa and 500oC, is expan

In a steam power plant, superheated steam at 10MOa and 500oC, is expanded isentropically in a turbine untiil it becomes a saturated vapour. it is then reheated at constant pressure to 500oC. The steam is next expanded isentropically in another trubine until it reaches the condenser pressure of 20kPa. Relevant properties of steam are given in the following two tables. The work done by both the turbines together is kJ/kg (roundoff to the nearest integer).Superheated Steam Table: Presure,p (MPa) Temp, p (oC) Enthalpy, h (kJ/kg) Entropy,s (kJ.kg.K) 10 500 3373.6 6.5965 1 500 3478.4 7.7621 Saturated Steam Table:1512.95

Answer» In a steam power plant, superheated steam at

10 M O a

and

500^{o} C

, is expanded isentropically in a turbine untiil it becomes a saturated vapour. it is then reheated at constant pressure to

500^{o} C

. The steam is next expanded isentropically in another trubine until it reaches the condenser pressure of

20 k P a

. Relevant properties of steam are given in the following two tables. The work done by both the turbines together is

k J / k g

(roundoff to the nearest integer).

Superheated Steam Table:

Saturated Steam Table: