The machine energy includes the energy consumed by all the mechanical and electrical processes necessary to dry a load of laundry (e.g. drum rotation, timers etc.). Equation 16 is used to calculate the machine energy.
ME = LE x loadsweek x 52 Equation 16
where
LE = load energy (kWh)
loadsweek = clothes dryer loads/week
52 = weeks/year
Machine energy for the average new clothes dryer has not changed significantly over time, so is assumed to be 0.23 kWh/load for the purposes of this model (PG&E 1995).