South Main Senior Lifestyles
Location: Milpitas, CA
Located at 1620 South Main Street in Milpitas, CA, South Main Senior Lifestyles was developed by SRM Development. It consists of 199 residential living units totaling 266,000 square feet, with a below-grade parking structure measuring 61,000 square feet.
The Savings Opportunity
The property’s garage mechanical ventilation system is powered by two, 10-(HP) motors and two, 7.5-HP motors, which run continuously (24/7), per code. Power measurements show they consume more than 225,750 kilowatt hours (kWh) per year, with a correlating peak-period demand of nearly 26 kW. With no means of motor control in place and applying a utility rate of $0.16/kWh, property management’s cost to ventilate the garage amounts to more than $36,000 annually.
The NES Solution
Design plans for South Main Senior Lifestyles did not identify a tie-in between the garage ventilation control system and the building management system (BMS), so NES specified our FG-20 digital demand-control ventilation (DCV) series controller for commercial garages. The NES FG-20 is our “stand-alone” system, but it can be readily scaled to comport with with BACnet® and Modbus® BMS communication protocols, delivering a high degree of functionality and value-added features, including Internet accessibility.
The cost to ventilate the garage is roughly $90 per month, compared to $3,000 per month without the NES system controlling the garage fans 24/7
Post-installation measurements of kW consumption at the respective garage-fan motors show the NES FG-20 system is reducing the garage mechanical system’s baseline of energy consumption by more than 219,000 kWh a year – a 97% savings. Peak kW demand was reduced by 25 kW, which also equates to a 97% savings. Including the cost of installation, the NES system pays for itself in just 17 months.