top 10 products that save money - david mcdougall, enernoc
DESCRIPTION
Presentation delivered at MassRecycle's 4th Annual Green Office / Green Facility Conference, Bentley University, June 15, 2010. Get invited to next year’s conference by signing up to MassRecycle’s free email newsletter at www.massrecycle.org.TRANSCRIPT
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Top Energy Efficiency Products
[6/15/2010]
Green Office Conference
[David McDougall][Manager of Analytics]
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Building Are Full of Energy Savings Opportunities
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“Less than 5% of commercial buildings in the US are actually commissioned after construction.”
- BCS Partners
“Closing our ‘national electric productivity gap’ could curtail up to 30% of our power consumption.”
- Rocky Mountain Institute
“The average commercial building uses 26% more energy than needed.”
- DOE / Energy Star
It’s no surprise that commercial buildings are not as efficient as they could be! There is still ample room to improve efficiency in this space.
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OK, But What Do I do? A Recipe For Success:
•Have a team, such as a green team, in place to review options and ensure tasks are implemented.
•There is no need to go it alone. Get help from utilities, engineers, peers, non-profits, and government resources.
• Know where the tax breaks and rebates are.
•Know where your building loads comes from. Conduct and internal audit and review. Use Portfolio Manager to benchmark.
• Consider a professional audit.
•Have a plan. Energy management should be as disciplined as financial management.
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1. Occupancy sensors
2. Photovoltaics
3. Frictionless chillers
4. Retro-commissioning / commissioning
5. Demand response
6. Bonus product: Variable frequency drives
Top Energy Savings Products and ServicesThese are some of products you may not be using that could save you money.
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Now that everyone has installed the most efficient lights, let’s control them.Savings from EPA study: The average office spends 29% of it’s electrical bill on lighting
Source– Bill Von Neida United States Environmental Protection Agency Green Lights ProgramUSEPA-6202J, 401 M Street, SW, Washington, DC 20460 E-Mail: [email protected]
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1. Cost: $30-$130 each, plus installation
2. Resources Utility rep, electrician, in-house facilities staff
3. Links http://www.ies.org/ ,
4. Retrofit Payback: 1-2 years, less with new construction
5. Extra credit: Add dimmer controls for daylight harvesting
Essential information
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•Total incentives for commercial buildings can reach 50% of the first cost
•Costs are dropping, increased panel and inverter supply, suppliers and capable contractors
•SRECs are a new added incentive
•ESCOs can often offer power for less than market rates. Beware of high escalator clauses.
•Paybacks can be as low as 3 years
Photovoltaics (PV): It’s time to consider solar as an investment Solar highlights for Massachusetts
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1. Net cost: $1-3 per installed kWh for commercial applications
2. Renewable energy tax credit $.03 / kWh, and SREC $3.25 /watt
3. Rebates and credits change often, get current and be prepared for new programs
4. Resources: http://www.dsireusa.org , http://www.masscec.com/index.cfm?pid=11052
5. Some Solar Providers http://www.nexamp.com/ , http://www.borregosolar.com/ma/ , http://www.solarmarket.com/ , http://www.ameresco.com/ , http://www.noresco.com/
PV Essential informationInterview Professionals
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When you need to Replace Water Cooled Chillers, go TurbocoreFrictionless chillers are super efficientKey Contacts: Mechanical Contractor, Utility Representative
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RCx Retro-Commissioning
A systematic, documented process that identifies low-cost operational and maintenance improvements in existing buildings and brings the buildings up to the design intentions of its current usage.
Why?: Because buildings rarely operate as designed.
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“Top 10” RCx Opp – for Energy Savings (from Building Commissioning Association)
10. Improve boiler efficiency/control
9. Reset Supply Air Static Pressure set-point
8. Terminal Unit tune-ups - dampers & valves
7. Return VFDs to variable speed operation
6. Lower condenser water temps/improve chiller sequence
5. Calibrate sensors and instrumentation
4. System level test & Balance (over air, over pumping)
3. Optimize/restore economizer operations
2. Eliminate simultaneous heating and cooling
1. Turn off equipment when not needed
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Years
1.00
1.05
1.10
1.15
1.20
1.25
0.95
0.85
0.90
0.80
Normalized Energy Usage
Savings opportunitySavings Opportunity
No Commissioning With SiteSMART Commissioning Services
With SiteSMART Monitoring-based Commissioning
MBCx Continuous Monitoring and CommissioningBuilding performance naturally degrades over time. SiteSMART uses building data and powerful algorithms to identify savings opportunities.
Source: Lawrence Berkeley National Lab, Benchmarking Analysis of monitoring-based commissioning
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Change in ScheduleAnnual savings = $21,000 CO2 avoidance = 102 tonnes
Savings Category No cost Action Recommended Enable auto-control. This unit was habitually overridden, but from continuous monitoring, each incidence was caught with minimal loss in energy savings. As a result of this measure new protocols were established for requesting off-hours usage to further limit this issue from re-occurring.
Example: Air Handling Schedules
Facility managers often don’t have the time to identify maintenance issues like equipment operating during off-hours. Increased costs are an undetected result.
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The AHU schedule (green) shows a regular daily schedule.SiteSMART found that actual operation (blue) was in constant over-ride.
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Demand response is a cost-effective and reliable way to meet peak demand. The alternative is to build generation and transmission capacity that will be used for only a fraction of a year.
0%
25%
50%
75%
100%
Winter Spring Summer Fall
% o
f S
yste
m P
eak
Dem
and
90%
>10% of infrastructure costs are spent to meet
peak demand that occurs less than 1% of the time
Annual US Electricity Demand - % of Peak
Demand Response OverviewDemand Response Overview
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Demand Response Overviewk
Wh
’s
24 Hours
$/k
Wh
24 Hours
Reliability/Security – DR can be brought to market more quickly and precisely than comparable generation or T&D, giving grid operators resources needed to better manage reliability NOW while paying end-users to tap into existing resources.
Price – DR can dramatically reduce pricing power of well-positioned generators and incentivizes end users to become active participants in energy markets – active participation keeps markets healthy and prices low.
Efficiency – Demand response raises the specter of efficiency. Increased end user market participation puts energy back on the business planner’s map and, when properly deployed, can save end-users 20% or more on energy bills.
Generation Capacity
Demand
kW
24 Hours
With EnerNOC
With EnerNOC
With EnerNOC
Demand response is achieved when end-users reduce their demand for electricity from the grid in response to market signals.
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Demand Response Overview
=
Grid operators must meet the demand of a control area’s aggregated load while meeting FERC’s reliability standard of downtime of no more than one day in ten years!
ERCOT Now Pays Load to Respond!!!
1 2
If Load Increases . . .
Build generator
Build generator
Build generator
Be more efficient
Curtail during critical peaks
Shift consumption
Plant 1’s Capacity
Plant 2’s Capacity
Plant 3’s Capacity+ +
Supply
+ +Your
Building’s Demand
Next Building’s Demand
Next Building’s Demand
Demand
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Variable Frequency Drives (VFD)
•Speed control for motors (pumps, fans, compressors)
•Can save 75% on some devices
•What devices come on fully that could be controlled? (Ie. RTU or pumps
•Must have “inverter ready” motors
•Rebates are usually available.
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