Project ForgeHeat Transfer
Heat Exchangers
GATE 2014
Easy
Steam economy of a multiple effect evaporator system is defined as
- Akilogram of steam used per hour
- Bkilogram of steam consumed in all the effects for each kilogram of steam fed
- Ckilogram of steam used in all the effects for each kilogram of water vaporized per hour
- kilogram of water vaporized from all the effects for each kilogram of steam fed to the first effect
Explanation
Steam economy = (total kg of water vaporized across ALL effects) / (kg of live/fresh steam fed to the FIRST effect). A well-designed N-effect evaporator train achieves steam economy approaching N, since the vapour from each effect is reused as the heating medium for the next.
Source: GATE CH 2014 (2014)
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