Title: M
1MV Part 3 FEMP MV Methods
2FEMP MV Methods
- Definition of Savings
- FEMP MV Guidelines
- Examples Applications
3FEMP MV Guidelines
- For federal energy projects
- Step-by-step procedural guide
- Defines MV methods by project type
- Current version is 2.2 (2000)
- Available at http//www.eren.doe.gov/femp/,
http//ateam.lbl.gov/mv/ or 1-800-DOE-EREC.
4What the Guidelines Cover
- Agreement language.
- Overview of procedures.
- Different MV approaches.
- Selecting the right approach for a project.
5What the Guidelines Dont Cover
- Specifying an approach for a project.
- Specific MV plan for each project.
- Required uncertainty levels.
- Specifying how to allocate risk between ESCO and
agency. - Project-specific OM savings.
6FEMP MV Compliance
- Complying with the FEMP guidelines requires
- Developing an MV plan using the defined methods.
- Following the MV plan.
- The important consideration is what is in the
plan.
7FEMP MV Options
8Options AB vs. Options CD
Options AB are retrofit isolation
methods. Options CD are whole-facility methods.
The difference is where the boundary lines are
drawn.
9Option A
- Simple approach ( low cost).
- Performance parameters are measured (before
after), usage parameters may be stipulated. - Used where the potential to perform needs to be
verified but accurate savings estimation is not
necessary. - Option A is NOT stipulated savings!
10Stipulate
- To stipulate is to agree to a term or condition.
- Under FEMP, to stipulate means to estimate
without measurement. - A parameter is either measured or stipulated, but
not both. - A measured parameter can be fixed for the
contract term.
11Option A Applications
- Projects where performance remains constant,usage
can be readily characterized, and uncertainty is
not a major issue. - Lighting efficiency.
- Timeclock controls.
- Efficient motors.
- Operations Maintenance.
12Option B
- Under Option B, some or all parameters are
measured periodically or continuously. - Applicable where accurate savings estimation is
necessary and where long-term performance needs
to be tracked. - Reduced uncertainty, but requires more effort.
13Option B Applications
- Projects with large elements of uncertainty
and/or risk (). - Variable speed drives.
- Chillers and chiller plants.
- Energy management control systems.
- Projects where equipment needs constant
attention.
14Option B Benefits
- Reasons to use Option B instead of A
- Real MV.
- Better equipment performance.
- Improved OM.
- Continuous CommissioningSM
- Remote monitoring.
- Continuous Commissioning is a service mark of
Texas AM University.
15Option C
- Option C looks at energy use and cost of entire
facility, not at specific equipment. - Usually simple.
- Considers weather, occupancy, etc.
- Applicable where total savings need to be
quantified but component-level savings do not. - Commercial software available.
16Option C Limitations
- Does not verify at component level.
- Requires savings to be significant (gt 15 of
baseline consumption). - Requires historical data (gt 1 year).
- May take time to evaluate savings.
- May require baseline adjustment to account for
non-project related factors.
17Option C Applications
- Projects where facility usage remains constant
and historical data is present. - Weather-dependent projects.
- Heating projects.
- Energy management control systems.
- Multiple interacting measures in a single
building.
18Option D
- Option D treats building as computer model.
- Flexible, but requires significant effort.
- Applications
- New construction.
- Energy management control systems.
- Building use changes.
- Building modifications.
19Option D Limitations
- Uses very specialized software that requires
significant experience to use. - Results vary with effort (and ) expended.
- Requires measurements for calibration.
- Weather-related usage often stipulated.
- Still need to verify potential to perform.
- Annual inspections recommended.
20Examples
- Option A Lighting
- Option B Variable-Speed Drive
- Option C Heating Plant
- Option D New Construction
21Example Lighting Project
- Consider the following lighting project
- Upgrade 5,000 fixtures
- Existing performance 86 Watts
- New performance 56 Watts
- Operating hours 3,000/year
- Electricity 0.10/kWh
22Method LE-A-01 / 02
- Performance
- Baseline power consumption is 86 Watts.
- Proposed power consumption is 56 Watts.
- Difference is 30 Watts.
- Usage
- Baseline New 3,000 hours / year
- Financial
- Energy 0.10/kWh
23Lighting Savings
- E Savings QTY (Before - After) Hours
- ES (5,000) (86 W - 56 W) (3,000 hours)
(1 kW / 1000 W) - ES 450,000 kWh / year
- Cost Savings (Unit Cost) (Energy Savings)
- Cost Savings (450,000 kWh) (0.10/kWh)
- Cost Savings 45,000 / year
24Example VSD Project
- Variable Speed Drive on HVAC Fan.
- Baseline Fan Operates continuously at a single
speed and power no matter what the cooling load
is. - VSD Fan Speed andpower change with coolingload
(outside temperature).
25VSD-B-01
- Fan Performance
- Baseline fan Constant power (140 kW).
- VSD Fan Power changes w/ weather.
- Fan Usage
- Fan power changes hourly with cooling load
(outside temperature and sunshine). - Financial
- Energy 0.10 / kWh
26Monitor Fan Performance
27Calculate Monthly Savings
E Savings S (kWBefore - kWAfter) (1
Hour) Cost Savings (Unit Cost) (Energy Savings)
28Example Heating Project
- Heating system upgrade at eastern US military
base. - Baseline Gas-fired boilers with central steam
plant provide heat to buildings. - New System Shut down steam plant. Install gas
furnaces in all buildings.
29Heating System Characteristics
- Base Performance
- Baseline low-efficiency and steam loss.
- New High efficiency, no steam loss.
- Energy Usage
- Driven by weather.
- Financial
- Gas is 0.50/therm.
30Compare Gas Use to Temperature
31Develop Baseline Model
32Calculate Monthly Savings
Baseline, therms 25.6 HDD - 1,378
33Example New Construction
- Proposed building incorporates energy-efficient
design features selected by ESCO. - Baseline building is existing design before ESCO
modifications.
34Develop Computer Model...
35...And Evaluate Results
36Calculate Savings
- Evaluate energy use for each scenario.
- Calculate savings for each scenario relative to
base case.
37Review and Discussion
- Total energy use and savings are a function of
both usage and savings. - Options A B are retrofit-isolation methods.
- Options C D are whole-facility methods.
- Can mix match methods.
38Review Questions
- What two factors determine energy savings?
- How does one comply with the FEMP Guidelines?