Section: Thermodynamics | Type: NAT | Marks: 2
A steam boiler contains saturated water vapour at 200 °C. After a certain period, the temperature of the boiler drops to 110 °C. Assume that all the valves of the boiler are closed and the energy is lost as heat to the surroundings. The ratio of mass of liquid to the mass of vapour is ___________ (rounded off to two decimal places). Saturated volume of vapour phase at 200 °C = 0.127 m3/kg Saturated volume of vapour phase at 110 °C = 1.210 m3/kg Saturated volume of liquid phase at 110 °C = 0.001 m3/kg
Answer: 8.1 to 8.9