Steam to Hot Water Conversion. The University of British Columbia, Vancouver IDEA Campus Conference, San Diego, Feb 2013

Transcription

1 Steam to Hot Water Conversion The University of British Columbia, Vancouver IDEA Campus Conference, San Diego, Feb

2 Who The University of British Columbia (Vancouver) 1000 acre foot print Owner/occupier 15 million sq.ft. of institutional and commercial buildings 3 million sq.ft. private residential Day time pop. ~ 50,000 Night time pop. ~ 15,000 ~ 30% growth expected over the next 15 to 20 years Steam ~1 million MMBtu s (Mcf or GJ) natural gas/year 220,000Ibs/hr peak load 78% of campus GHG emissions Electrical 288 GWh/year 47 MWe peak load 8% of campus GHG emissions Water ~1.2 billion gallons (US)/year Utilities Commodities ~ CD$26M/year 2

3 What Project summary: Five year, $88m project: Convert the current steam to a new Hot Water system A new HW boiler powerhouse & Bioenergy Research Demonstration Facility (BRDF) Roadmap: Feb 11 Board of Governors approval of 9 phase project Oct 12 phase 1,2,3 & BRDF complete, phase 4 (Hot Water Powerhouse) in design June 13 approval of phases 4-9 Impact: Positive return on UBC s investment 22% Greenhouse Gas reduction Produce 7,200MWh of green electricity from Biomass Risk mitigation strategies: Proven technology Sauder School of business peer review of business case Pre-purchase phase 5-9 pipework and ETS s Pipework routing strategies 3 3

4 Where (9 phase project) 4

5 Why? Aging infrastructure: $42 million required over the next 20 years System efficiency: 60% for Steam vs. 85% for hot water BC Carbon liabilities: $55/tonnes CO2e or (~$2.75/MMBtu or Mcf) UBC Climate Action Targets: GHG reduction of 33% by 2015, 67% by 2020, 100% by 2050 Increased supply options: Waste heat recovery, satellite boilers, solar thermal, and high efficiency cogeneration 25 year payback 5

6 Phase 1 summary The Road So Far 1 mile (trench mile) of piping installed 13 buildings converted Project phase completed Mar 2012, on budget on time Energy and GHG savings ~20,000 Mcf (GJ) NG and 1000 tonnes of CO2 equivalent Steam generated and Waste heat recovery from bioenergy facility 6

7 The Road So Far Bioenergy Research Demonstration Facility Project summary: First of its kind biomass cogeneration project using syngas clean up technology First of its kind in BC, as regards the social licensing and siting of a biomass/cogen facility in an densified urban setting Faculty & Operations working together collaboratively Impact: Positive return on UBC s investment 12% Greenhouse Gas reduction; offsets the consumption of ~150,000Mcf (GJ) of NG from existing powerhouse 20,000lbs/hr in thermal mode or 9,600lbs/hr and 2MWe in Cogen mode 7

8 Phase 2 & 3 summary 2.2 miles (trench mile) piping installed 5 buildings converted (no buildings yet connected phase 3) 6.6MMBtu additional capacity from existing oversized boilers Energy and GHG savings ~11,000 Mcf (GJ) NG and 560 tonnes CO2 equivalent Project phases completed Dec 2012, on budget and on time To Phase 3: A further 1.2miles laid. No buildings connected. The Road So Far From Phase 1 and BRDF 8

9 Two Stage Project What s Next? Stage 1: new 200,000lbs/hr Hot Water Powerhouse in service Jan 2015 Stage 2: Potential new Cogeneration extension ~74,000lbs/hr & 25MWe in service Jan 2016 (yet to be approved) Benefits Large-scale self generation of heat and potentially power Significant reduction of Greenhouse Gas emissions UBC Energy security Phase 5-9 DPS Phase 4: Campus Energy Center (CEC) Phase 5-9: Final DPS Installation Pipework to be laid and commissioned from 2013 to Dec Expectation for the ADES to be in service by Jan

10 SOME LESSONS LEARNED UBCV Phased implementation has verified costs estimates and delivered energy savings while allowing for an exit strategy Existing steam piping was found to be very poorly insulated Elimination of 80+% of existing boiler pressure vessels (BPV) and steam regulated equipment. Reuse of existing steam HEX s are a viable option for initiating a DE project, before the new primary heat source is constructed. 10

11 Ambient Temperature District Energy System The University of British Columbia, Okanagan 11

12 UBCO District Energy System The Okanagan campus is situated in Kelowna which is 250 miles east of Vancouver. The climate is hot and dry in the summer and cold and dry in the winter. The DES is over 3 miles of pipeline serving 1 million square feet of mixed academic buildings. The ambient temperature range (48F-75F) is maintained by geothermal temperature exchange. Additional heating is provided by a high efficiency condensing boiler and additional cooling is provided by two 400 ton evaporative cooling towers.

13 UBCO District Energy System DES Supply DES Return Bldg. Link

14 Sun Building Energy Loop Shade To Other Buildings HWS CHWS To Terminal Devices Water Source Heat Pumps DES Return DES Supply HX Building Loop Balance HP HP Control Valve HP

15 Energy Balance 9:03am Oct 12, 2012

16 Renewable District Heating Energy 80% of Heating Sources are from Renewable Energy!

17 Open Loop Geoexchange Cross Section

18 Geoexchange Infrastructure 70 km 2 Aquifer, 60m thick 38,000 tonnes of estimated GHG emissions saved over 25 year period, equivalent to 3,500 vehicles removed from roads $14 million total project cost over 3 phases $2.9 million Provincial & Federal K.I.P. grant for Phase 2 3,200 USGPM licensed peak groundwater pumping rate Awards: - $57,106 FortisBC electrical utility grant - $41,000 FortisBC Gas condensing boiler rebate - Featured on local Television News - Believed to be the first of its kind/largest Technology is scalable and portable to other campuses Approval of the system given by nearby water utility Groundwater components constructed to drinking water standard Monitored and tested continually to ensure compliance with groundwater standards and Ministry of Environment Environmental Assessment Office or EAO

19 Campus Mode - Balanced Campus Energy Share Ring Facilities Served Arts Sciences Admin Student Centre Fine Arts Library Health Sciences Fipke Centre Fitness Arts/Sciences Eng/Mgmt/Educ. (81,864 m2) Fluid Coolers - Off Groundwater - Off 8.9 C C District Energy Control Facility 8.9 C C Groundwater - Off Boiler - Off

20 UBCO's Aggressive Greenhouse Gas Plan By 2015: Reduce GHG emissions to 67% of 2007 levels By 2020: Reduce GHG s to 33% of 2007 levels By 2050: Eliminate GHG s and become a net positive energy producer 96% of GHG Emissions are from Buildings (Heating & Electricity)

21 Reducing Heating GHG s & Energy Cost Competing Technologies 1) Natural Gas Fired Boiler Heating Output Input Energy Req d Earth Energy Input CO2 (greenhouse gas) Output Energy Cost 1 GJ 1.25 GJ (gas) Φ 67.5 kg $11.88 (1) 2) Water to Water Heat Pump 1 GJ 0.29 GJ (electricity) 0.71 GJ kg (0.05% of Natural Gas) $4.25 (2) Notes: 1) Based on UBCO s natural gas cost of $9.50/GJ including taxes. 2) Based on FortisBC electricity cost of $ /kW*hr including taxes.

22 GHG Reductions - Results UBC Okanagan Campus GHG Emissions / square meter Year Buildings (m 2 ) tco 2 e Efficiency (tco 2 e/m 2 ) Efficiency Improvement vs Baseline ,919 2, ,100 2, (1) 97,900 2, % ,844 2, % ,200 3, % ,400 3,204 (2) (2) 25% (2) Notes: 1) 2009 was the first full year of operation with the Geoexchange based Fipke Centre. 2) Predicted tco 2 e emissions based on recent Carbon Reduction Study and two quarters of utility data.

23 Question Period Paul Holt - Director, Utilities and Energy UBC Okanagan 2040 West Mall Vancouver, BC, V6T 1Z2 Tel: (604) E: paul.holt@ubc.ca Colin Richardson - Geoexchange System Manager, UBC Okanagan 3333 University Way Kelowna BC V1V 1V7 Tel: (250) E: colin.richardson@ubc.ca George Hutchison - Mechanical Team Lead Williams Engineering Canada Inc. # Enterprise Way Kelowna, BC V1Y 9S9 Tel: (778) E: ghutchison@williamsengineering.com

24