Steam to Hot Water Conversion

Steam to Hot Water Conversion
The University of British Columbia, Vancouver
IDEA Campus Conference, San Diego, Feb 2013
1
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
What
Project summary:
Impact:
Five year, $88m project:
Positive return on UBC’s
investment
Convert the current steam to a
new Hot Water system
22% Greenhouse Gas reduction
A new HW boiler powerhouse &
Bioenergy Research
Demonstration Facility (BRDF)
Produce 7,200MWh of green
electricity from Biomass
Roadmap:
Risk mitigation strategies:
Feb 11 Board of Governors
approval of 9 phase project
Proven technology
Oct 12 phase 1,2,3 & BRDF
complete, phase 4 (Hot Water
Powerhouse) in design
June 13 approval of phases 4-9
Sauder School of business peer
review of business case
Pre-purchase phase 5-9 pipework
and ETS’s
Pipework routing strategies
3
3
Where
(9 phase project)
4
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
Phase 1
summary
•
1 mile (trench mile) of
piping installed
•
13 buildings converted
The Road So Far
• 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
The Road So Far
Bioenergy Research Demonstration Facility
Project summary:
Impact:
First of its kind biomass
cogeneration project using
syngas clean up technology
Positive return on UBC’s
investment
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
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
The Road So Far
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.
From
Phase 1
and BRDF
8
What’s Next?
Phase 4: Campus Energy Center (CEC)
Two Stage Project
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: Final DPS Installation
Phase 5-9 DPS
Pipework to be laid and commissioned from 2013 to Dec 2014.
Expectation for the ADES to be in service by Jan 2015
9
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
Ambient Temperature District Energy System
The University of British Columbia, Okanagan
11
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.
UBCO District Energy System
DES Supply
DES Return
Bldg. Link
Sun
Building Energy Loop
Shade
HWS
To Other Buildings
CHWS
To Terminal Devices
Water Source
Heat Pumps
DES
Return
Building Loop
Balance
DES
Supply
HX
Control Valve
HP
HP
HP
Energy Balance –
9:03am Oct 12, 2012
Renewable District Heating Energy
80% of Heating Sources are from Renewable Energy!
Open Loop Geoexchange Cross Section
Geoexchange Infrastructure
70 km2 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
Facilities
Served
Campus
Mode Balanced
•
•
•
•
•
•
•
•
•
•
•
Campus
Energy Share
Ring
Arts
Sciences
Admin
Student Centre
Fine Arts
Library
Health Sciences
Fipke Centre
Fitness
Arts/Sciences
Eng/Mgmt/Educ.
(81,864 m2)
Fluid Coolers Off
8.9°C - 23.9°C
Groundwater - Off
8.9°C - 23.9°C
Boiler - Off
District Energy
Control Facility
Groundwater - Off
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)
Reducing Heating GHG’s & Energy Cost
Competing
Technologies
Heating
Output
Input
Energy
Req’d
Earth
Energy
Input
CO2
(greenhouse
gas) Output
Energy Cost
1) Natural Gas
Fired Boiler
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
0.033 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 $0.05278/kW*hr including taxes.
GHG Reductions - Results
UBC Okanagan
Campus
GHG Emissions / square meter
tCO2e
Efficiency
(tCO2e/m2)
Efficiency
Improvement vs.
2007 Baseline
71,919
2,186
0.0304
-
79,100
2,412
0.0305
-
97,900
2,825
0.0289
5%
2010
110,844
2,726
0.0246
19%
2011
139,200
3,135
0.0225
26%
2012
140,400
Year
Buildings
(m2)
2007
2008
2009
(1)
3,204
(2)
0.0228
(2)
25%
(2)
Notes:
1) 2009 was the first full year of operation with the Geoexchange based Fipke Centre.
2) Predicted tCO2e emissions based on recent Carbon Reduction Study and two quarters of utility data.
Question Period
Paul Holt Director, Utilities and Energy
UBC Okanagan
2040 West Mall
Vancouver, BC, V6T 1Z2
Tel: (604) 822-0852
E: [email protected]
Colin Richardson Geoexchange System Manager,
UBC Okanagan
3333 University Way
Kelowna BC V1V 1V7
Tel: (250) 807-9144
E: [email protected]
George Hutchison - Mechanical Team Lead
Williams Engineering Canada Inc.
#304 – 1912 Enterprise Way
Kelowna, BC V1Y 9S9
Tel: (778) 484-2984
E: [email protected]