Retrocommissioning Program

UBS

677 Washington Blvd, Stamford, CT

Definition

Retrocommissioning (RCx) is a program that seeks maximum performance efficiency through the optimization of existing building systems.

Ideal RCx Candidate

Good Building Management System Well maintained facility Good record documentation Knowledgeable operations staff Good vendor relationships Willingness to collaborate

RCx Process Phase 1

Scoping study RCx investigation

Phase 2 Recommendations and priorities RCx implementation

Phase 3 Verification of results Persistence monitoring

Documentation Training

Goals of RCx Program

Energy savings Cost savings Establish an eco-friendly corporate culture Future development of workable cost-effective solutions

677 Washington Blvd

Major Financial Center Occupying 1.4 MM SQ-FT Trading Operations – 125,000 SQ-FT Mission Critical Data Center – 30,000 SQ-FT Offices – 600,000 SQFT Kitchen/Cafeteria – 35,000 SQ-FT Atrium – 13,000 SQFT Parking – 640,000 SQ-FT

Energy profile of 48 MM kWH per year

RCx Findings

Central Plant & HVAC Systems Chilled water temperatures operated on a fixed scale. “Free” cooling was part of a scheduled program. Many of the pumps were driven by constant speed motors regardless

of demand. Obvious inefficiencies in the piping system. Excessive electric heat – 2 mW.

Lighting Systems Inefficiency of the dimming system on the trading floor. Garage lighting operating on a 24x7 basis. Excessive off-hours lighting.

Target Reductions

Electrical Consumption kWH: 5 to 10% Reduction.

RCx Examples Piping Upgrades

Condenser water flow control upgrades were made through changes in operation as well as the elimination of extraneous piping loops.

Central Plant Equipment Upgrades Many of the motors used for primary pumping were optimized for

variable speed drives.

Lighting Upgrades Dimming systems optimized in the trading area and atrium. Off-hours lighting controlled by sensors that are linked time clocks.

Results

Overall per month reduction of 3,840,000 kWH (average).

Overall annual cost savings of $614,000. CO2 reduction of 1,106 tons.

Future Goals

Incorporation into our LEED certification program. Initiate RCx for all facilities.