Appendix B 333
- Ability of the ECM as designed to achieve the intended savings
- ECM implementation effectiveness in meeting the design intent
- Occupant or operator cooperation in using ECM related equipment
in accordance with direction - Occupant or operator cooperation in using non-ECM related
equipment in accordance with direction - Equipment deterioration, both ECM related equipment and non-
ECM related - Equipment life, both ECM and non-ECM related
4.2 EVALUATING SAVINGS UNCERTAINTY
The effort undertaken in determining savings should focus on
managing the uncertainty created in the determination process. ECMs
with which the facility staff are familiar may require less effort than
other, uncommon ECMs. The savings determination process itself in-
troduces uncertainties through
- Instrumentation Error
- Modeling Error
- Sampling Error
- Planned and Unplanned assumptions
Methods of quantifying the first three errors are discussed in Ap-
pendix B. As used in this protocol, sampling error concerns do not refer
to rigorous statistical procedures, but to the best practices as addressed
in Appendix B. See also Reddy & Claridge (2000) that applies standard
error analysis methods to the typical savings determination scenario.
The last category of error above, encompasses all the unquantifi-
able errors associated with stipulations, and the assumptions necessary
for measurement and savings determination.
It is feasible to quantify many but not all dimensions of the un-
certainty in savings determination. Therefore when planning an M&V
process, consideration should be given to quantifying the quantifiable
uncertainty factors and qualitatively assessing the unquantifiable. The