1 steam to hot water conversion the university of british columbia vancouver, b.c
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Steam to Hot Water ConversionThe University of British Columbia
Vancouver, B.C.
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The University of British Columbia
UBC StatsSteam • 785,000,000lbs/year• 1.1 million GJ/year NG• 78% of GHG emissions
Electrical • 309 GWh/year • 49 MWe peak load • 8% of GHG emissions
UBC Stats• 12 million sq.ft. of
institutional buildings
• 3 million sq.ft. residential
• Day time pop. ~ 65,000
• ~ 30% growth over the next 15 to 20 years
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5 year, 9 phase, $88 million project to convert the campus from steam to a hot water
• 11 kilometers of pre-insulated direct buried piping
• 115 building conversions
• 60 MegaWatt Natural Gas fired Campus Energy Center
• 12 buildings w/ steam process load requirements
Steam to Hot Water Project Overview
History of District Energy at UBC
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UBC Powerhouse circa 1925
• 3rd permanent building built on campus
Original 1920’s Coal Fired Boilers
• 3 original Boilers• Boiler 1&3
replaced in the 1950’s
• All 3 converted to Natural Gas in 1960’s
• Boiler 3 decommissioned in the 70’s
• Boiler #1 & 2 still working today
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1969 Boiler added #5 – 150,000 LBS/hr
1961 Boiler #4 added – 100,000 LBS/hr
1960’s Campus Growth
1965 Boiler #2 Replaced -100,000 LBS/hr
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100
150
200
250
300
350
400
450
500 UBC Steam Energy Use Intensity
KW
h/M
^2/y
r
2002 Ecotrek Project • $30m Largest energy and water retrofit project on a Canadian campus• Major focus on steam system improvements• Allowed UBC to meet it’s Kyoto Protocol
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Reduced intensity by 23% and saved over
150,000 GJ/yr ofNatural Gas
78%
11%
2%
1%
6% 2%
Baseline is 61,090 tonnes Co2 equivalent
Natural Gas for steam
Natural Gas for direct use
Fleet Gaso-line
Fleet Biodiesel
Electricty
Paper
2007 Comprehensive campus GHG inventory
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2010 UBC GHG REDUCTION TARGETS
UBC adopted its Climate Action Plan in 2010, committing the university to aggressive greenhouse gas (GHG) reduction targets of:
33% below 2007 levels by 2015 67% below 2007 levels by 2020
100% below 2007 levels by 2050
• Detailed Campus wide feasibility study recommends a mix of demand side and supply side options including:
1. Steam to hot water conversion of district heating system
(22% GHG reduction) 2. Bioenergy Research and Demonstration Facility
(12% GHG Reduction)3. Continuous optimization of buildings
(3-5% GHG Reduction)
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ACHIEVING GHG REDUCTION TARGETS
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UBC STHW Project
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Rationale for STHW
• Saves $5.6 million per annum in regulatory, commodity, carbon, capital, operational & maintenance costs
• Reduces Campus Greenhouse Gas emissions by 22%
• Aging infrastructure – boilers, piping, heat exchangers and plant
• Increased energy supply options
• Risk mitigation strategy
6th October 2014 8th October 2014
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Phase 1 Summary
• 1,100 trench meters of piping laid
• 13 buildings converted
• Successful repurposing of existing oversized heat exchangers
• Connect to future waste heat from BRDF
• Phases 1 completed on
budget and on time • Confirmed Phase 1 energy
savings of 12,000 GJ’s NG and 600 tonnes of CO2 emissions
Phase 1 Pilot Project
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• Phased implementation verified costs estimates and delivered energy savings
• 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.
PHASES 1 LESSONS LEARNED
USB Mech Room
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Phase 2-3 Summary
• 3,600 trench meters of DPS laid
• 5 buildings added
• Coordination with UBC Public Realm
• 500m of steam lines decommissioned
• Confirmed Phase 2 energy savings of 3,000 GJ’s NG and 150 tonnes of CO2 emissions
Western Steam feeder li
ne
Temporary Energy Center
New DE feeder p
ipe line summer 2
013
Temporary Energy Center (TEC): Early energization project
Main UBC Steam feeder li
ne
Steam Powerhouse
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TEC Summary
• Allows for ongoing building commissioning prior to CEC construction
• Likely 45+ buildings will be added in advance of CEC
• Expected additional energy savings of 125,000 GJ’s NG and 6,250 tonnes of CO2 emissions for 2014/15
Phase 4 Campus Energy CentreExpected Completion September 2015
• 3 x 15 MW Natural gas/#2 diesel boilers • 1 MW condensing economizer• Designed for future expansion, and• Future integration with other clean energy technologies (cogeneration).
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Energy Centre’s
6MW Biomass 2 MW Cogen (HR)(In service)
16 MW Temporary Steam to hot waterStation complete (In service)
60 MW Hot water Campus Energy centre(Under construction)
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Feb 2015 Building Conversions Energy Transfer Stations (ETS)
35 Complete 70 under construction
Expected Nov/Dec 2015 All Planned UBC Buildings Converted
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Steam Process Loads• 12 buildings with sterilization requirements
(Autoclaves, cage washers)
• 6 buildings require steam for humidification Most researchers already had clean steam generators
• Absorption chillers (3) required replacement
• Kitchens – Dishwashers (2) and steam kettles (3)
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LSC and Pharmacy Process Steam Microgrid, Proposed
Building ~6MWt/hr
Process peak 4,000lb/hr
ADES
LP Header
HP Steam Header
HINDSIGHT 20/20• Earlier assessment of orphan steam
requirements.• Work year round (first three years was
summer only)• Improved communications for campus
stakeholders on disruptions• Regular communication for project team
crucial• The temporary energy centre was
essential (would have done it earlier)
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Conclusions to Date
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• Project is currently 90% tendered, on schedule and on budget• Phased implementation:
• allowed for lessons learned in earlier phases to be incorporated into future phases
• verified costs estimates• delivered energy and cost savings from phase 1 onwards• confirmed original business case assumptions e.g. existing steam
piping was found to be very poorly insulated• Elimination of 80+% of existing boiler pressure vessels (BPV) and steam
regulated equipment within converted buildings. • On target for 5.5 km’s of steam line to be decommissioned by end 2014• Use of Existing steam HEX’s and a TEC, allows for the early energization of
DPS & ~ 60% building conversions, while implementing the DE project and before the new Campus Energy Center is built & commissioned.
• STHW on target to achieve a minimum 22% GHG reduction as expected by end 2015
