# Two boilers one with superheater… is 20 bar solved problem

#### Two boilers one with superheater and other without superheater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is 20 bar. The temperature of steam from a boiler with a superheater is 350°C and temperature of the steam in the main, is 250°C. Determine the quality of steam supplied by the other boiler. Take cps = 2.25 kJ/kg.

Two boilers one with superheater and other without superheater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is 20 bar. The temperature of steam from a boiler with a superheater is 350°C and temperature of the steam in the main, is 250°C.

Determine the quality of steam supplied by the other boiler. Take cps = 2.25 kJ/kg.

2. Find the internal energy of 1 kg of steam at 20 bar when

(i) it is superheated, its temperature being 400°C ;

(ii) it is wet, its dryness being 0.9.

Assume superheated steam to behave as a perfect gas from the commencement of superheating and thus obeys Charle’s law: Specific heat for steam = 2.3 kJ/kg K.

3. Two boilers one with superheater and other without superheater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is 20 bar. The temperature of steam from a boiler with a superheater is 350°C and temperature of the steam in the main, is 250°C.

Determine the quality of steam supplied by the other boiler. Take cps = 2.25 kJ/kg.

4. Determine the entropy of 1 kg of wet steam at a pressure of 6 bar and 0.8 dry, reckoned from freezing point (0°C).

5. Steam enters an engine at a pressure 10 bar absolute and 400°C. It is exhausted at 0.2 bar. The steam at exhaust is 0.9 dry. Find :

(i) Drop in enthalpy ;

(ii) Change in entropy.