The initial hot water temperature, TH (to) is assumed to be equal to Td - Δ.The variation of TH (t) for one day is shown in Figure 3-3 (A), the ASHRAE Wd schedule is shown in Figure 3-3 (B) and the instantaneous power consumed by the EWH is shown in Figure 3-3 (C). The simulation (time) step is 0.0001h.