Field Test Evaluation of Conservation Retrofits of Low-Income, Single-Family Buildings in Wisconsin: Audit Field Test Implementation and Results Page: 28 of 84
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3.3 ENERGY CONSUMPTION DATA
One of the most important characteristics of the energy consumption data is
that they are (approximately) weekly interval data. All meters (furnace
run-time meters, utility gas meters, and utility electric meters) were read on
weekly schedules by meter readers employed for this project; they went from
house to house and recorded the readings on a standard form. When it was not
possible to read the meters on schedule, they were read as soon after the
desired time as possible. Gas or electric meters that had to be read from
inside the house were sometimes missed because the occupant was not at home when
the meter reader arrived. Missed readings were not estimated. Observation
lengths were allowed to vary so as to correspond to actual meter reading times.
The regression analysis (Appendix A) was designed to accommodate variable length
observations. The readings were checked for reasonableness as they were
transferred to magnetic media.
3.3.1 Heating System Gas Consumption
All the retrofits included in the audit, except the IID,* are intended to
reduce space heating energy consumption. The most direct and accurate way to
measure the gas consumed by a furnace or boiler is with a standard gas meter on
the gas line serving the heating system. Use of a gas meter was impossible for
this project because of the cost and the time it would take to have the meters
installed. Consequently, a run-time meter (also called an elapsed-time meter)
was used to measure furnace gas consumption.
A run-time meter is a clock that records the amount of time a device is on.
Instead of a dial with hands marking the hour of the day, a run-time meter has a
counter that counts the hours of operation of the device to which it is
attached. Cramer type 635G, 24V/6OHz meters were used. Most central gas space
*The IID replaces the pilot of a furnace or boiler. The pilot contributes very
little to space heating, but it or an IID is necessary for gas-heating system
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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. (digital.library.unt.edu/ark:/67531/metadc740901/m1/28/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.