Sometimes it takes a BIG team to do the job – Alternative ...
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Sometimes it takes a BIG team to do the job – Alternative Delivery of Cogeneration through the Washington ESPC Process Jeremy Holland, HDR Engineering, Inc.
Transcript of Sometimes it takes a BIG team to do the job – Alternative ...
Sometimes it takes a BIG team to do the job – Alternative Delivery of Cogeneration
through the Washington ESPC ProcessJeremy Holland, HDR Engineering, Inc.
What we’ll cover today
• What is the process?• What was the project?• Who was involved?• Specific Project Steps• Next Steps
What is the process?• Energy Savings
Performance Contracting (ESPC)
• Started in Washington State in 1986
• State prequalifies Energy Services Companies (ESCOs) every 2 years (currently 10 prequalified ESCOs)
• Any governmental agency can use this prequalified list
• ESCOs are picked or may interview
What is the process?
• ESCOs perform a Preliminary Audit
• Identify Energy Conservation Measures (ECMs)
• Investment Grade Audit• Design-Build Project• Measurement &
Verification
What is the process?
• Ways of Funding– ESCO Finance– ESCO Municipal Lease– 3rd Party Finance– State LOCAL (Local Option
Capital Asset Leasing) program
– Energy cost savings– Grants, loans, incentives from
utilities*– Owner capital budgets/funds*
What is the process?
• Pros– Prequalified Contractor– No/Low Financial Risk– Open book costing– No bidding out subs or
equipment– Control Products (Some)– Faster process
• Cons– Additional Parties involved
from State GA – Performance based
approach
What was the project?• LOTT Alliance Budd Inlet
WWTP• Plant had larger digester gas
fueled cogeneration engine that was oversized for digester gas available. Engine was removed in 2004
• Space available, heat loop in place to install new engine
• Needed new gas treatment system
• Gas available = 3.1 MMBH
Who was involved?• LOTT Alliance – Project Sponsor/Owner• Washington State Department of General
Administration – Contracting Mechanism & ESPC Process Oversight
• Puget Sound Energy – Funding and Interconnection Review
• ORCAA – Air Emissions• City of Olympia Building Dept. - Permitting• Trane, Inc. – D/B Contractor• HDR – Engineer• Smith Power Products – Engine provider• CalPwr – Gas treatment system supplier• Cascade Power - Permitting• Damon Controls – I&C Integration• Hermanson Mechanical – Mechanical Sub• Betchart Electric – Electric Sub
Project Specific Steps - Investment Grade Audit
• Evaluate gas available• Evaluate elements of
existing system that need to be modified
• Develop preliminary drawings for contractor cost estimate
• Perform lifecycle cost analysis to show payback of improvements
Project Specific Steps - Design Phase
• Develop design documents for building modifications– Detailed analysis of
necessary demolition
Project Specific Steps - Design Phase
• Develop design documents for building modifications– New heat loop pumps
& tie ins to high and low temperature loops
– New natural gas high efficiency boilers
– Generator breaker in mechanical room
– Verify HVAC requirements satisfied
Project Specific Steps - Design Phase
• Select engine and configure for project – 335 kW GE/Jenbacher Engine– Exhaust Heat Recovery Silencer
• Develop specification for gas treatment system supply– Sulfatreat H2S removal– Glycol chiller– Booster blowers & moisture
removal/gas cooling heat exchanger
– Activated Carbon siloxaneremoval
Project Specific Steps - Design Phase
• Support permitting efforts with PSE, ORCAA, Olympia
• Develop electricity offset documentation for PSE grant funding – gas storage to demonstrate adequate engine operation
Project Specific Steps - Design Phase
• Teamwork Opportunities– Electrical Connection– Heat loop usage– Noise Issues– Gas treatment selection– Emissions Permitting
Project Specific Steps - Construction & Start Up Phase
• Review submittal of items for construction –primarily engine, boilers, gas treatment
• Respond to questions from Contractor, sort through field issues as they arise
• Respond to questions from Contractor during start up
Project Specific Steps – Measurement & Verification
• Working out the bugs– Heat
Rejection– Engine
Capacity– Hot Room– Gas cooling– Excess gas
available
What’s Next?• Engine meeting performance• Received 70% of project cost
from PSE• Excess gas available• Adding small digester gas
boiler• Rerate Engine?• Replacing strainer to improve
cooling performance in low temperature loop
• NEW ECM PROJECT: Replacing aeration blowers with turbo blowers
Questions?
Jeremy Holland, HDR Engineering, Inc.
