Sometimes it takes a BIG team to do the job – Alternative ...
Transcript of 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 ProcessJeremy Holland, HDR Engineering, Inc.
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What we’ll cover today
• What is the process?• What was the project?• Who was involved?• Specific Project Steps• Next Steps
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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
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What is the process?
• ESCOs perform a Preliminary Audit
• Identify Energy Conservation Measures (ECMs)
• Investment Grade Audit• Design-Build Project• Measurement &
Verification
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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*
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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
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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
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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
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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
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Project Specific Steps - Design Phase
• Develop design documents for building modifications– Detailed analysis of
necessary demolition
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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
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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
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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
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Project Specific Steps - Design Phase
• Teamwork Opportunities– Electrical Connection– Heat loop usage– Noise Issues– Gas treatment selection– Emissions Permitting
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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
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Project Specific Steps – Measurement & Verification
• Working out the bugs– Heat
Rejection– Engine
Capacity– Hot Room– Gas cooling– Excess gas
available
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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
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Questions?
Jeremy Holland, HDR Engineering, Inc.