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An optimal water allocation in a Metropolitan region. An Integrated Operation of Multi-Regional Water Supply Networks for. June 5 2007. Tae-Sang Ryu, Sung Ryong Ha, Ik-Hwan Ko. Outline. Introduction Research Objective Literature Review Methodology Model simulation
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An optimal water allocation in a Metropolitan region An Integrated Operation of Multi-Regional Water Supply Networks for June 5 2007 Tae-Sang Ryu, Sung Ryong Ha, Ik-Hwan Ko
Outline • Introduction • Research Objective • Literature Review • Methodology • Model simulation • Summary & Future research diretion
Multi-Regional Water Supply Network A city Integrated Management Center D city B city C city
Integrated Operation Control & Management Scheme C Integrated Operation Center 무선망 B 유선망 Coordinated Operation ◈ A ◈ B ◈ C A Joint & Integrated Management
I. II. Research Objectives Pre-feasibility survey of joint operation for optimal water allocation in a wide areas with multi -sources Integrated optimal water allocation model
Literature Review Research Categories for Modeling • water distribution modeling ☞ mathematical formulation modeling • water supply modeling ☞ economic operation scheduling for the sake of supply to meet the demand Water Supply Modeling Research Category • water network operation with optimal pump scheduling ☞ Optimal pump scheduling in water supply network, Paul W. • optimal allocation of water sources ☞ Drought management of existing water supply system, Dean Randall.
II. I. III. Methodology Problem Diagnosis Two phases of modeling • Hydraulic Simulation approach using EPANET • Optimization approach based on Economic operation rule Supplying cost Flow constraints Strategy
Water Demand Prospective in the Future (Supply to Demand) 2009 yr
Current operation condition Namgang(II) - Capacity 55000 m3/d (77000 m3/d – 2011) Gucheon - Capacity 20000 m3/d Yeoncho - Capacity 16000 m3/d
Current Situation (Daily Demandvs. Capacity) ☞ dailydemand peak factor1.25, Yeon-cho water treatment plant is under rehabilitation
Modeling Input Boundary Condition • Physical Condition (m3/day) * length means from Namgang-dam to Jukdo junction • Demand (4 cases) 2007, 2011yr daily maximum & mean • Simulation Period steady state simulation
Simulation Condition • Mass Balance Eq., Closed Network ☞ ∑∑ q i k= ∑ Q k, i=each demand node, k = multi sources 2. Determination water demand of each nodes(qi) ☞ using gaged data and planning data, • Combination of operating pumps according to the step 2 ☞ Q p,k = ∑ q i k , p = operating pump unit combination 4. Simulation case study ☞Demand 4 cases, independent opertation case, joint operation 4 cases(N+G, N+Y, G+Y, N+G+Y), pump combination several cases • Constraint simulation case, ☞closing Pipe cases
Modeling Analysis Target • Overlapped supply area ☞ water demand 4 cases : 2007, 2011 yr daily max, mean ☞individual network operating by 4 demand cases • Pre-feasibility study for joint operation ☞ water demand 4 cases : 2007, 2011 yr daily max, mean ☞joint operation with adjacent supply network • Supply unit cost by consumer for optimization model
Simulation Case study summary • Individual, Joint operation with closing pipe or without closing pipe 2 cases, 4 demand cases, joint operation cases of mutual systems(N+G, N+Y, G+Y, N+G+Y) • Pump combination (ex, supply(q)=70781, satisfying ratios(r) = 103%, energy cost(p) =985087)
Pump Characteristic Curve Parallel pump installation status Supply amount raises pipeline hydraulic loss Supply to meet demand -> effect supply area by individual system Analysis of Modeling Results- Overlapped Supply Area -
Hydraulic Modeling NamgangSingle operation case for maximum daily demand • Namgang2, capable of supplying to all areaexcept A-jou (q=70781,p=985087) • To keep Simulation condition step 1 and to get solution, Ajou and sangdong node demand input zero
Hydraulic Modeling Namgangwater supply area for mean daily demand • Mean demand case shows Capable of supplying to all area, except A jou (that is, Ajou demand zero) (q=58678, p=908689)
Hydraulic Modeling • Solid line : water supply area by daily maximum demand • Dotted line : water supply area by daily mean demand
Hydraulic Modeling Overlapped area analysis results 3 Supply area 2 Supply areas
Modeling Results Analysis- Pre feasibility Survey for Joint Operation
Hydraulic Modeling Current pipe closing condition vs fully open operating condition • Current operation condition, closing point is appropriate • Current opeartion is better than the other option operation
Hydraulic Modeling current closing opertion vs full open operation condition • Namgang , Gucheon, Yeonchojoint operation with closing pipe line vs without closing pipe line • Joint operation without closing pipe line is most effective way in future demand conditionin case of 3 networks joint operation.
Hydraulic Modeling Optimal pump combination to 2011 yr Demand • In 3 network Joint Operation and 2011yr max. demand case, this graph shows most economic pump combination • Variation of cost and supply satisfaction by pump combination (Yeoncho-Gucheon-Sadeung) on X-coordinate
Hydraulic Anaysis for Joint Operation Namgang+Gucheon+Yeoncho Joint Operation(max.) • In Pump combination N(1-1)-G(2)-Y(1) case, Sadung, Sinhyen, 2 nodes happens negative pressure • Optimal Pump combination N(2-0)-G(2)-Y(1)
Hydraulic Analysis Simulated result of joint operation Qmax Qmean(max80%) • Simulation results of joint operation with Max., Mean(=MAX80%) water demands - > Big difference of electricity cost • Optimal operation condition depends on how many networks to be used, which network mainly used, and how many pumps to be operated
Modeling Analysis Target • Overlapped supply area ☞ water demand 4 cases : 2007, 2011 yr daily max, mean ☞individual network operating by 4 demand cases • Pre-feasibility study for joint operation ☞ water demand 4 cases : 2007, 2011 yr daily max, mean ☞joint operation with adjacent supply network • Supply unit cost by consumer for optimization model
Summary & Future Plan Summary - Identify Overlapped supply area - Identify Feasibility of Joint Operation of Mutual Networks Future Plan - Supply unit cost for optimization model - Develop Optimal allocation Model
Hydraulic Modeling Current operation condition vs closing point changing condition • Following Current operation condition, with pipe closing at two points and 2 network operation, compare simulation results according to pump combination • Current operating indicate lower pumping cost.
Hydraulic Modeling current closing opertion vs full open operation condition • Namgang + Gucheonjoint operation with closing pipe line and without closing pipe line • Joint operation without closing pipe line is more effective in future demand condition
Hydraulic Modeling Current closing operation vs full open operation condition • Namgang + Gucheon + Yeonchojoint operation with closing pipe line and without closing pipe line • Joint operation without closing pipe line is most effective way in future demand conditionin case of 3 networks joint operation.
Hydraulic Anaysis Simulation results of single operation • Simulation results of joint operation with MAX, MIN(=MAX80%) water demands • Relationship between joint and single operation
Hydraulic Anaysis for Joint Operation Namgang+Gucheon Joint Operation (max. daily) • (q=24575+52828, p=1328359)
Hydraulic Analysis Namgang+Gucheon joint operation (max. daily 80%) • (q=21717+40206, p=1135716)