目标函数为计算期内单位供热量的节约额现值。
The objective function of the optimization is the saving present value per unit heat consumption during the calculation period.
子系统的优化目标函数是等额年费用；总体优化的目标函数是财务净现值。
Objective function of son system is yearly cost; Objective function of overall system is NEPV.
子系统的优化目标函数是等额年费用；总体优化的目标函数是财务净现值。
Objective function of son system is yearly cost; Objective function of overall system is NEPV.
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