| Waterside (PAUàFAF): 1/COP_CH *(QBLDGPRE – QBLDGPOST)*OPHR,yr
Waterside (VSD CWP for IECU): SkW_CWPPOST*OPHR,yr
Where (COP_CHPOST – COP_CHPRE)/ COP_CHPRE = 1.25% per 1°C increase of TCHWS
COP_CHPOST = [1.25%*(TCHWSPOST – TCHWSPRE) + 1]*COP_CHPRE
COP_CH = 0.605*COP_CHSM + 0.395*COP_CHWN
COP_CHSM = (COPaSM + COPbSM)/2; COP_CHWN = (COPaWN + COPbWN)/2
QBLDG = 0.605*[0.77*(0.88*NCHSM*QCHSM + 0.12*NCHWN*QCHWN)] + 0.395*[0.596*(0.184*NCHSM*QCHSM + 0.816*NCHSM*QCHSM)]
SkW_CWPPOST = 0.605*LFSM*(0.88*NCWPSM*kW_CWPSM + 0.12*NCWPWN* kW_CWPWN) + 0.395* LFWN*(0.184*NCWPSM*kW_CWPSM + 0.816*NCWPWN*kW_CWPWN)
For CSD: LFSM = LFWN = 1;
For VSD: LFSM = 0.795, LFWN = 0.562;
For EC or DC-motor: LFSM = 0.71, LFWN = 0.38
OPHR,yr = hr/day*day/wk*52
Airside: (AHUàIECU) (SkW_AHUPRE – SkW_IECUPOST) * OPHR
Where S kW_AHUPRE = (0.605*LFSM,PRE + 0.395*LFWN,PRE )*NAHU*kW_AHU
SkW_FCUPOST = (0.605*LFSM,POST + 0.395*LFWN,POST)*NIECU*kW_IECU
For CSD: LFSM = LFWN = 1,
For 3-speed: LFSM = 0.882 , LFWN = 0.717
For VSD: LFSM = 0.795, LFWN = 0.562;
For EC or DC-motor: LFSM = 0.71, LFWN = 0.38
OPHR = hr/day*day/wk*wk/yr
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