Retrofit

Retrofitting Strategy	Replacement of traditional 3-speed FCU to variable speed FCU with permanent magnet motor
	DC permanent magnet motor efficiency is often above 90%, allowing fans to consume up to 70% less energy when compared to conventional fans.
	Consideration
	Smart control thermostat can provide precise temperature control as well as automatic control of fan speed based on measured room temperature. By using intelligent networking thermostats, more advanced energy saving strategies can be achieved such as interlocking with lighting control, remote control, occupancy detection, etc. Installation of power meter for FCU electrical circuits
	Estimated Saving
	(SkW_FCU_PRE – SkW_FCU_POST) OPHR,yr Where S kW_FCU_PRE = (0.605LF_SM,PRE + 0.395* LF_WN,PRE)NFCU_PREkW_FCU_PRE SkW_FCU_POST = (0.605LF_SM,POST + 0.395 LF_WN,POST)NFCU_POSTkW_FCU_POST For CSD: LF_SM = LF_WN = 1, For 3-speed: LF_SM = 0.882 , LF_WN = 0.717 For VSD: LF_SM = 0.795, LF_WN = 0.562; For EC or DC-motor: LF_SM = 0.71, LF_WN = 0.38 OPHR,yr = hr/dayday/wk52 Please click HERE to view the list of terminology.