Sustainability Best Practices

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Presentation transcript:

Sustainability Best Practices HVAC Retrofit Variable Flow CHW Pumping and Plant Optimization June 29, 2016 Dennis K. Elliot, PE, CEM Director - Energy, Utilities, and Sustainability Cal Poly State University, San Luis Obispo

Cal Poly Central Chiller Plant 5 Chillers – 2,550 tons capacity 1.6M gal Thermal Energy Storage Tank Serves 21 buildings, 1.1M GSF Constructed 1997 for future TES Expanded in 2004 Expanded in 2011, TES added

How Does TES Work? On-peak (noon to 6 pm): Pump from tank Off-peak: Charge tank Load Shift ~ 1MW Chillers run at night Tank performance: Water stratifies by temperature Insulation losses < 1%/day Total energy stored = mass x dT Designed for 20 degree Delta T

Buildings Control the Plant Delta T! CHWS PUMP DECOUPLER AHU AHU CHWR Building Tertiary Loop Constant Volume

Retrofit to Boosted Secondary VFD CHWS PUMP AHU dP AHU CHWR Building Tertiary Loop Variable Volume

Retrofit Project Scope Goals: Maximize building and thus Plant delta T Reduce flow rates, minimize pumping energy Optimize chiller and cooling tower operation Scope: Convert 14 buildings to “boosted secondary” Remove AHU bypasses and building decouplers Install VFD’s, pump bypasses, 2-way valves Implement “most open valve” control scheme Implement optimization scheme in Chiller Plant Run both towers, variable CDW flow, minimize fan energy Stage chillers to ensure full charge before peak period

Retrofit Project Scope Install 204 Cypress wireless pneumatic stats in 3 buildings DDC system now sees zone temps via BACnet Allows more sophisticated supply temp reset New combustion controls on Central Plant Boilers Digital O2 trim Combustion blower VFD’s

Project Results Project cost: $1.4M, 11 year payback Savings: 1,000,000 kWh/yr of electricity 47,000 therms of natural gas 610 tonnes C02 $128,000/yr utility savings Improvements to plant performance: Before: 13 degree Delta T, 0.75 kW/ton After: 19 degree Delta T, 0.68 kW/ton 46% increase in TES energy storage

Sustainability Best Practices Resources Dennis Elliot – Director of Energy, Utilities, and Sustainability (805) 756-2090 delliot@calpoly.edu www.sustainability.calpoly.edu Links: PG&E On-Bill Finance SCE On-Bill Finance SDG&E On-Bill Finance CEC Energy Efficiency Financing

Sustainability Best Practices Questions?