Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results Page: 25 of 84
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3. FIELD TEST APPROACH
3.1 GENERAL APPROACH
This study followed the conventional approach of measuring heating fuel
consumption of individual houses for a range of weather conditions before and
after installation of the retrofits. Linear regression analysis was then used
to model the relationship between space heating fuel consumption and the average
ambient temperature. Long-term average weather conditions were used to
calculate normalized annual heating fuel consumption (NAHC). The difference
between the NAHC, before and after installation of the retrofits, is the
normalized annual heating fuel savings (NAHS).
External constraints and the desire for timely results led to formulation
of a research plan calling for all data to be collected and retrofits to be
completed in one heating season. In order to collect the maximum quantity of
data, an optimum schedule was developed. This schedule had fuel use data
collection beginning by October 1, and all retrofits completed during the second
and third weeks of January. Fortunately, the regression analysis is resilient
enough to accommodate considerable variance from the optimum schedule, and the
weather was cooperative.
Fuel use data collection on individual houses began during the last half of
October and the first half of November in 1985. Most retrofits were performed
during the last two weeks of January and the first two weeks of February, 1986.*
Post-retrofit data collection for each house began shortly after the retrofits
were completed. Data collection terminated during the month of May. The last
useful observation on most houses occurred around the first of May.
*Two stragglers were not completed until the end of February.
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McCold, L.N. Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results, report, January 1, 1988; United States. (https://digital.library.unt.edu/ark:/67531/metadc740901/m1/25/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.