Quantitative Treatment of Heat Load Loop in Tuning Heat Exchanger Network
The research presented a quantitative solution to tackle the heat load loops in tuning a heat exchanger network.For the heat exchanger network with heat load loops required to conduct energy relaxation,the variations of the annual operation and equipment cost before and after the retrofitting was estimated respectively,and the change of the total annual cost was obtained to make decision about whether to retrofit the heat exchanger network.Annual operation cost is relevant to the load of energy relaxation and the price of utilities,while annual equipment cost is related to the area and materials of heat exchangers,the pay-back period of projects,etc.The load of energy relaxation and the material of heat exchangers have a remarkable impact on the total annual cost,and in this case of the heat exchanger network,the research took into account the effect of the material of heat exchangers on the total annual cost.The calculated results for the case show that as the material of the heat exchangers is increasing,there is a descending trend for the difference between the total annual costs of the retrofitted and original heat exchanger networks.The sign change of the difference causes the alteration of the heat exchange network scheme.If the difference between the two total annual costs is positive due to using cheap heat exchanger material,it is desirable to keep the original heat exchanger network unchanged,and if the difference is negative due to using expensive material,the heat exchanger network with the energy relaxation should be adopted.The research is instructive to tune heat exchanger network in process industry.
heat exchanger networkheat load loopenergy relaxationtotal annual costheat exchanger material
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