Energy Saving Case Studies

A 28,000 s.f. multi-tenant office building had total yearly utility billing of $60,000. Fifteen roof-top package unit upgrade and a centralized energy management system was installed. With custom programming was implemented to bring total saving to 29%. Cost per s.f. was reduced from $2.14 to $1.54. ROI was achieved in 2.7 years.

Project includes the following features:
HVAC temperature range adjustment by Relative Humidity and occupancy Sensors
Door Sensor to lockout compressor
After-hour timed override with auto-mated link to Excel, or other application programs
Power monitoring, data-logging, trending
Lighting: occupancy and time of day control.
Artificial Intelligence demand limiting algorithm to minimize PG&E demand charges by each meter/account--does not require pulse meter instrumentation
Exhaust fans, and peripheral lighting time-of-day control.

An electronics company occupying 56,000 s.f. building achieved saving of $102 a day as a result of fine-tuning EMS control, and work habit of employees.

One light industrial complex of 300,000 s.f. embarked upon a retrofit program of Variable Frequency Drives(VFD), pro-active preventive maintenance, economizers, enhanced controls, and lighting retrofit. The result is 22% reduction of energy expense while increasing staff by 12%.