Retrofit

Retrofitting Strategy	Conversion to demand fresh air control system coupling with exhaust air system
	Demand-controlled fresh air system adjusts fresh air intake based on actual need at any given time instead of at a fixed rate for full occupancy. IAQ sensors measure carbon dioxide levels to signal the heating, ventilation, and air conditioning (HVAC) system to adjust the amount of fresh air brought into the space.
	Consideration
	Ensure that the carbon dioxide sensors are located at locations that can reflect the carbon dioxide level of the occupied zone. Carbon dioxide sensors need to be calibrated from time to time.
	Estimated Saving
	(SkW_PAU_PRE – SkW_PAU_POST) OPHR,yr Where S kW_PAU_PRE = NPAU_PREkW_PAU_PRE SkW_PAU_POST = (0.605LF_SM,POST + 0.395LF_WN,POST)NPAU_POSTkW_PAU_POST For CSD: LF_SM = LF_WN = 1, 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.