UC Irvine Energy Efficiency Energy Storage Energy Optimization. Matt Gudorf CEM, LEED AP Assistant Director Energy, Engineering, and Inspection

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1 UC Irvine Energy Efficiency Energy Storage Energy Optimization Matt Gudorf CEM, LEED AP Assistant Director Energy, Engineering, and Inspection

2 Quick Facts Established in 1965 Comprehensive Research University 13 Lab buildings past two decades 8-24MW Load 1,526 Acres 10M+ Square feet 7.5M Sqft District Utilities 24,489 Undergraduates 6,268 Postgraduates $20,754,196 Utility Budget

3 PROCUREMENT ELECTRICITY Distribution Service by SCE TOU-8-S Departing Load Direct Access Cost Responsibility Surcharge Generation Purchased through an energy service provider (ESP) Day ahead market NATURAL GAS Commodity DGS contract with BP Buy futures up to 75% NYMEX Henry Hub CA Citygate price Delivery SoCal Gas CA border to UCI Distributed Generation Power Purchase Agreements 20 and 25 year contracts Predetermined rates and escalation Key: Flexibility with managed risk

4 Campus Utilities Edison MacArthur Substation 66kV UCI Substation 66kV/12kV 4

5 Campus Utilities Central Plant: 8 chillers Gas turbine: 13.5 MW Steam turbine: 5.6 MW Edison MacArthur Substation 66kV UCI Substation 66kV/12kV

6 SOLAR TITAN 130 COMBUSTION TURBINE 13.5 MW AT 12,000 VOLTS

7 OLAR TURBINE ASSEMBLY BEFORE EING PLACED INTO ENCLOSURE

8 Campus Utilities Central Plant: 8 chillers Gas turbine: 13.5 MW Steam turbine: 5.6 MW TES Solar Rooftop PV MW Edison MacArthur Substation 66kV UCI Substation 66kV/12kV

9 Social Science Parking Structure

10 Social Science Parking Structure 935kW Equivalent Generation in a year US Homes

11 Student Center Parking Structure

12 Student Center Parking Structure 725kW Equivalent Generation in a year US homes

13 Mesa Parking Structure

14 Mesa Parking Structure 909kW Equivalent Generation in a year US homes

15 Campus Utilities Central Plant: 8 chillers Gas turbine: 13.5 MW Steam turbine: 5.6 MW TES Solar Rooftop PV MW Edison MacArthur Substation 66kV UCI Substation 66kV/12kV CPV 113kW

16 UC IRVINE S 12KV DISTRIBUTION SYSTEM 10 - Distribution circuits kV transformers 77 - SF6 Switches

17 Campus Utilities Central Plant: 8 chillers, 4 Boilers Gas turbine: 13.5 MW Steam turbine: 5.6 MW Solar Rooftop PV MW Edison MacArthur Substation 66kV UCI Substation 66kV/12kV CPV 113kW

18 Campus Utilities Thermal Storage 4,500,000 Gal 60,000 Ton-Hour Central Plant: 8 chillers Serve 82 Buildings TES

19 BOILER DATA Boiler #1& #2 Babcox & Wilcox 250PSI 29,000lbs/hr, 1964 Oil & Gas Burner Boiler #3 - Nebraska 300PSI 30,000lbs/hr, 1970 Boiler #4 - Trane Murray 300PSI 30,000lbs/hr, 1978

20 Chiller Plant Details Manufacture Rating in Tons Refrigerant Year Installed Chiller #1 Trane 1000 R Chiller #2 Trane 1000 R Chiller #3 Trane 1000 R Chiller #4 York 2000 R-134a 2002 Chiller #5 Trane 2500 R Chiller #6 Trane 2500 R Chiller #7 York 3000 R-134a 2007 Chiller #8 York 3000 R-134a ,000 Tons of nominal chiller capacity

21 Chilled Water System AHU coils designed for 39 F supply System ΔT of F PIC-V or Flow Limiters at each AHU Average load 3,100 tons Peak load 13,000 tons 74,400 Ton-Hours per day Flow 30 header is 35,600 gpm Secondary pump capacity 25, feet of head TES pump capacity is 22, feet of head Delivered 0.7kW per ton

22 Chilled Water Load Side Optimization the campus changed out AHU coils to provide a ΔT minimum of 20 F. The system makes use of Pressure independent control valves and flow limiters to minimize use and maximize energy efficiency Monitoring the hydronic system at the building level

23 Thermal Energy Storage Tank holds 4.5 million gallons of chilled water Tank is 107 tall by 88 in diameter When chilled to 39 F, rated storage is 186,400 kwh 0-8MW of load can be shifted Originally built to shift load to off-peak rates

24 UC Irvine Drastically Reduces Load 45%

25 Operating Limitations 1 The interconnection agreement is for inadvertent export of power only. 2 Curtailment of the CTG is limited to 7.5MW due to emissions 3 Solar power production cannot be curtailed (PPA) 4 Efficiency of the CTG drops as output is reduced 5 Import electricity cost more than self generation Load Generation Import Electricity So how is the near perfect management as shown on the right achieved? UC Irvine uses TES as an electrical battery to flatten and shape load to match generation!

26 Balancing Load and Generation 909 kw Solar Rooftop PV (Mesa Parking) 725 kw Solar Rooftop PV (SC Parking) 935 kw Solar Rooftop PV (SS Parking) UCI Campus TES 13.5 [MW] GT 4.5 [MW] ST 3,575 [KW peak ] PV 66 [KV] circuit Ten 12 [KV] circuits 7 Electric Chillers Storage Central Plant NGCC PV SCE Load GT = Gas Turbine ST = Steam Turbine NGCC = Natural Gas Combined Cycle SCE = Southern California Edison

27 MONITORING THE MICROGRID Generation Import Combustion Turbine Steam Turbine Solar PV Load Plant Building Sub Building Circuit Building Management HVAC Lighting Storage Tank Charge Over 100,000 data points Trend, Analyze, Optimize

28 0-18 MW Ideally, utilize the chillers and TES to flatten the load shape PV drops off, peak cooling demand Morning Building Load Solar PV 24 Hours

29 0-18 MW Flattest possible load shape Matched to Generation Utilize Solar Maximize Base Loaded CTG Import as little as possible 24 Hours

30 Actual Load and Generation Graph From UCI Campus

31

32

33 Financial Savings Energy Cost Per Square foot $1.80 $1.60 $1.40 $1.20 $1.00 $0.80 $0.60 $0.40 $0.20 $ Optimization of load and generation results in financial savings Minimal import of expensive electricity Solar offsetting peak demand

34 Next steps Implement a ½ MW, 2 MWh battery (In construction) Deploy full SCADA system from SEL across campus grid (In construction Engineer, implement, and test islanding of the campus Additional optimization of the balance between, load and generation

35

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