| (SkW_CHWPPRE – SkW_CHWPPOST + SkW_DCHWPPOST) *OPHR,yr
Where S kW_CHWPPRE = 0.605*LFSM,PRE*(0.88*NCHWPSM*kW_CHWPSM + 0.12*NCHWPWN* kW_CHWPWN) + 0.395* LFWN,PRE *(0.184*NCHWPSM*kW_CHWPSM + 0.816*NCHWPWN*kW_CTWN)
SkW_CHWPPOST = 0.605*LFSM,POST*(0.88*NCHWPSM*kW_CHWPSM + 0.12*NCHWPWN* kW_CHWPWN) + 0.395* LFWN,POST*(0.184*NCHWPSM*kW_CHWPSM + 0.816*NCHWPWN*kW_CHWPWN)
SkW_DCHWPPOST = 0.605*LFSM,POST*(0.88*NDCHWPSM*kW_DCHWPSM + 0.12*NDCHWPWN* kW_DCHWPWN) + 0.395*LFWN,POST*(0.184*NDCHWPSM* kW_DCHWPSM + 0.816*NDCHWPWN*kW_DCHWPWN)
For CSD: LFSM = LFWN = 1,
For VSD: LFSM = 0.795, LFWN = 0.562;
For EC or DC-motor: LFSM = 0.71, LFWN = 0.38
For VSD at specific speed:
LFSM = 0.88*(HzSM/50)^1.35 +0.12*(HzWN/50)^1.35;
LFWN = 0.184*(HzSM/50)^1.35 +0.816*(HzWN/50)^1.35
OPHR,yr = hr/day*day/wk*52
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