چكيده لاتين :
At many circumstances, in heat exchange processes several exchangers were used
with different cost laws due to their pressure ratings, materials of construction and exchange3r
types. In such circumstances traditional methods ofpinch technology can not be led to minimum
total annual cost may cause some other disadvantages like more complexity or higher maintenance.
In this research work a neliי approach based on decomposition has been used to achieve the costeffective
networks with multiple cost laws. The cost laws multiplicity can has several reasons. The
most common cases are; mixed pressure ratings, mixed types and mixed materials of construction
however many other factors such as purchasing exchangers "from different vendors or purchasing
exchangers in different times can also cause multiplicity cost laws.The present paper demonstrates
application oftwo decomposition methodologies (Total decomposition and Partial decomposition)
for afew sample conditions with typical cost laws. The outcomes ofthis study indicate effectiveness
and potentiality ofthe methods
