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

-

50

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

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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

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Thank you

David.Woodson@ubc.caor

Paul.Holt@ubc.ca