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Optimising Energy Performance of Water Supplies

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Information about Optimising Energy Performance of Water Supplies
Education

Published on March 13, 2014

Author: TippEnergy

Source: slideshare.net

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Presentation at the Innovative Energy Solutions for Water Assets workshop at the SEAI Energy Show 2014
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Optimising Energy Performance of Water Supplies Paul Kenny, B.E. C. Eng. Chief Executive Tipperary Energy Agency WARES SEAI Energy Show

• €60M spend nationally excl. DBO • Pumps, blowers and aerators • Opportunities 20% - 30% from 2009 SEAI report • Renewable generation a key opportunity • Significant organisational Change • How to achieve opportunity? Context

• Pumps • Poorly sized • Design Vs current operation • Demand change • Improved technology • Aeration Systems • Poor O2 transfer efficiency • Improved design • PE Changes • Renewable electricity • Demand and Cost reduction Key Opportunities

Pumps • Centrifugal pumps are very simple • Each pump is best of a specific flow and head • The wrong pump could be doing a job perfectly well – except cost being higher • How do you know? – Calculate & compare – Manufacturers pump data – Review market best practice. © TEA. www.tea.ie

Case Study Recommended Max Op Pt @170 m3/h Recommended Min Op Pt @140m3/h Current Op. Pt 25.00 30.00 35.00 40.00 45.00 50.00 0 m3/h 20 m3/h 40 m3/h 60 m3/h 80 m3/h 100 m3/h 120 m3/h 140 m3/h 160 m3/h 180 m3/h 200 m3/h 220 m3/h 240 m3/h 260 m3/h 280 m3/h m Oughterard Hi-Lift Pumping System Curve Step Control Recommended Operating Points Head Loss Vs Flow Rate Good Practice Pump Author: Enda McGovern, TEA

Throttling • Throttling is “creating artificial head” • Valves partially closed • Ballcocks at reservoirs – bell-mouths better. • Non return valves - faulty, undersized. • Eliminate with VSD either © TEA. www.tea.ie

Sewage Pumps • Impellor choice critical – Balance between Energy Eff & Blocking – Wear a big issue – keep well maintained – Good selection critical • Warning signs: – Increased amps without blockages, Decreased flow rates – Excessive vibration, Any electrical trips etc. – Overheating • Replace – New WW pumps improved massively over last 3 years – 5-10 year lifespan – Ragging excessively. – Energy savings often pay for new pump in months. © TEA. www.tea.ie

• Goal: Minimise total system life cycle energy efficiency • Understand system constraints (pipe size, chlorine retention etc). • Size pump accurately – should not be done by the market. • Identify other optimisation • Procure on life cycle Sizing & Procurement

Implementation • Detailed Energy Audit: – Monitoring and design of actual duty Pressure/ Flow – Ancillary system design/ requirements – Understanding full system efficiency not pump only. – PSAT / ASME-EA2 (Draft ISO) Optimisation. • Opportunity/ Business case – Best practice requirements – Controls and optimisation • Implementation – Procurement on life cycle assessment – EPC accountability – Engineering time invested pays © TEA. www.tea.ie

Results © TEA. www.tea.ie

Results © TEA. www.tea.ie

Energy Performance Indicator WSNTG 0 0.1 0.2 0.3 0.4 0.5 0.6 10612 40612 70612 100612 130612 160612 190612 220612 250612 280612 10712 40712 70712 100712 130712 160712 190712 220712 250712 280712 310712 30812 60812 90812 120812 150812 180812 210812 240812 270812 300812 20912 50912 80912 110912 140912 170912 200912 230912 260912 290912 kWh/m3 Date

Aeration • Efficiency by maximising oxygen transfer efficiency and use • Minimise excess O2 through controls – load to demand. • Maximise transfer efficiency – Fine bubble diffusers: Smaller bubbles, slowest assent – Maximise mixing – Area of output © TEA. www.tea.ie

Killarney WWTP Replacement of the horizontal oxygenation rotors with Fine Bubble Diffused Air System. • Project Cost €122,000 • Estimated Saving in 2009 - €45,000 • Ditch capacity increased by over 30% • High maintenance rotors removed. • 1.93 kWh/kg BOD before • 0.82 kWh/kg BOD after 58% Less

Renewable Energy • Hydro Wind Solar PV • Hydro needs high input pressure • Wind needs high site • Solar needs a big roof/ area • Export rates low currently and need either base load or large scale. © TEA. www.tea.ie

Case Study • Carna Cill Chiaran – Pump Efficiency 25% Plant Reduction – Constant Pump VSD Vs start stop – 20kW base load wind turbine. – 32% capacity factor to date • Combine~40% © TEA. www.tea.ie

• Non profit, public good enterprise • Partnership approach • Energy management • Renewable energy and energy efficiency • Procurement, project mgmt. • Cost effective, value driven • Paul Kenny • Chief Executive • T: 052 7443090 • F: 052 7443012 • E: pkenny@tea.ie • W: www.tea.ie Tipperary Energy Agency

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