Question

Q.4 In a reheat Rankine-cycle power plant, a concentrator solar plant (CSP) system gives steam at 5 MPa and 4000C. After expansion in the high-pressure turbine to 600 kPa, the steam is reheated again to 4000C and expands again in the low-pressure turbine to a pressure of 10 kPa in a dry, saturated steam condition. If the steam leaves the condenser as a saturated liquid and the pump and high-pressure turbine efficiency is 85%, determine the efficiency of a low-pressure turbine, the work output of the two turbines, the work input to the pump per unit mass of the fluid, the heat added by the CSP system, and the cycle efficiency. If the solar radiation is 900 W/m2 and the CSP system operates at 40% efficiency, how many square meters of collectors are required if the steam flow rate is 1 kg/s.

Answer 1

Efficiency of low pressure Turbine (
`n_(lp)` ) = 82.9%

Square meters ( Area of collectors ) = 9705.2 m^2

Step-by-step explanation:

Given data :

T1 = 400⁰c

p1 = 5 Mpa

p2 = 600 kpa

p3 = 600 kpa

p4 = 10 kpa

high pressure turbine efficiency = 85%

solar radiation = 900 w/m^2

Csp efficiency = 40%

A) calculate the efficiency of a low-pressure turbine

E ) Determine the area of the collectors

attached below is a detailed solution of the given problem