#### 1000 kg of steam at a pressure of 16 bar and 0.9 dry is generated by a boiler per hour. The steam passes through a superheater via boiler stop value where its temperature is raised to 380°C. If the temperature of feed water is 30°C, determine : (i) The total heat supplied to feed water per hour to produce wet steam. (ii) The total heat absorbed per hour in the superheater. Take specific heat for superheated steam as 2.2 kJ/kg K.

1000 kg of steam at a pressure of 16 bar and 0.9 dry is generated by a boiler per hour. The steam passes through a superheater via boiler stop value where its temperature is raised to 380°C. If the temperature of feed water is 30°C, determine :

(i) The total heat supplied to feed water per hour to produce wet steam.

(ii) The total heat absorbed per hour in the superheater.

Take specific heat for superheated steam as 2.2 kJ/kg K.

1. What am0unt of heat would be required to produce 4.4 kg of steam at a pressure of 6 bar and temperature of 250°C from water at 30°C ? Take specific heat for superheated steam as 2.2 kJ / kg K.

2. Determine the mass of 0.15 m^{3} of wet steam at a pressure of 4 bar and dryness fraction 0.8. Also calculate the heat of 1 m^{3} of steam.

3. 1000 kg of steam at a pressure of 16 bar and 0.9 dry is generated by a boiler per hour. The steam passes through a superheater via boiler stop value where its temperature is raised to 380°C. If the temperature of feed water is 30°C, determine :

(i) The total heat supplied to feed water per hour to produce wet steam.

(ii) The total heat absorbed per hour in the superheater.

Take specific heat for superheated steam as 2.2 kJ/kg K. #1000 kg of steam

4. Using steam tables, determine the mean specific heat for superheated steam :

(i) at 0. 75 bar, between 100°C and 150°C ;

(ii) at 0.5 bar, between 300°C and 400°C.

5. A pressure cooker contains 1.5 kg of saturated steam at 5 bar. Find the quantity of heat which must be rejected so as to reduce the quality to 60 % dry. Determine the pressure and temperature of the steam at the new state.

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