The machine energy is the electrical energy consumed by all the physical processes necessary to run a load of laundry (e.g. agitation, spin cycle), and is calculated using Equation 13.
ME = LE x loads x 52 Equation 13
where
LE = load energy (kWh/load)
loads = clothes washer loads/week
52 is weeks/year
Machine energy for the average new clothes washer has not changed significantly over time, so is assumed to be 0.23 kWh/load for the purposes of this model (DOE 1990, Page 3-22 table 3.17).