Operational Optimization of Large-Scale Parallel-Unit SWRO Desalination Plant Using Differential Evolution Algorithm

Table 1

The basic parameters of OOP in Liuheng SWRO desalination plant.

Parameters	Sign	Value
The number of RO units	𝑛	8
The number of PFWTs	𝑚	4
The number of RO units which feed freshwater to each PFWT	𝑛1	2
	𝑛2	2
	𝑛3	2
	𝑛4	2
The upper limit of the permeate rate of RO Unit i, (m^3/h)	𝑄1,max	460
	𝑄2,max	460
	𝑄3,max	570
	𝑄4,max	570
	𝑄5,max	570
	𝑄6,max	800
	𝑄7,max	570
	𝑄8,max	570
The lower limit of the permeate rate of RO Unit i, (m^3/h)	𝑄1,min	380
	𝑄2,min	380
	𝑄3,min	470
	𝑄4,min	470
	𝑄5,min	470
	𝑄6,min	655
	𝑄7,min	470
	𝑄8,min	470
The initial value of PFWT (m^3)	𝑉1,0	340
	𝑉2,0	340
	𝑉3,0	340
	𝑉4,0	340
The maximum capacity of PFWT i, (m^3)	𝑉1,max	1680
	𝑉2,max	1680
	𝑉3,max	2280
	𝑉4,max	1680
The minimum capacity of PFWT i, (m^3)	𝑉1,min	320
	𝑉2,min	320
	𝑉3,min	320
	𝑉4,min	320
The maintenance cost coefficient	𝐶1	11.5
The repair and replacement fees	𝐶2	155
The correlation coefficient of energy consumption and generated freshwater	𝐶3	2.86