Answer to Question #105415 in Thermal Power Engineering for Kule

Question

feedwater enters a boiler drum at a pressure of 4826 kPa abs, 148.9°C and a specific volume of 0.00109 m^3/kg. steam leaves the superheater of the boiler at 4137 kPa abs, 287.8°C and a specific volume of 0.0546 m^3/kg. calculate: a. the flow work in kj/kg associated with the water entering the boiler drum, and b. the flow work in kj/kg associated with the steam leaving the superheater

Answer 1

Flow work of fluid as it exits or enters the system

$w=pv$

where $p$ - pressure, $v$ - specific volume;

$w_{enter}=4826000\cdot0.00109=$ $5.26$ $kJ/kg$

$w_{exit}=4137000\cdot0.0546=225.88$ $kJ/kg$