The following data was recorded during a test performed on a steam plant consisting of a Lancashire boiler, economiser and a superheater. Steam generated = 5,000 kg/hr at 14 bar pressure %3D Mass of coal burnt = 670 kg/hr Calorific value of coal = 29500 kJ/kg Temperature of feed water at entry and exit of economiser = 30°C and 130C respectively. Temperature of steam leaving the superheater = 320 °C. Dryness fraction of steam leaving the boiler = 0.97 Cp (superheated steam) = 2.3 kJ/kg-K %3D Cp (water) = 4.18 kJ/kg-K Calculate: (1) Factor of evaporation. (2) Overall efficiency of the plant.

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Center of Gravity and Centroid

The term center of gravity indicates the position or location of a point about which the whole weight of a body or system is supposed to be concentrated, which means the whole weight of the body or system works through this point. It is closely related to mass distribution. For all positions of the body, the center of gravity would be a single point.