Chemical Engineering Plant Economics
Optimum number of effects in a multiple effect evaporator is decided by the

Cost benefit analysis
Evaporation capacity required
Floor area availability
Terminal parameters

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Chemical Engineering Plant Economics
Chemical engineering plant cost index is used for finding the present cost of a particular chemical plant, if the cost of similar plant at some time in the past is known. The present cost of the plant = original cost x (index value/(index value at original cost was obtained)The most major component of this cost index is

Pumps and compressor
Electrical equipments and material
Process instruments and control
Fabricated equipment and machinery

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