City of Denver: Richard T. Castro Building

Background

The Richard T. Castro Building was built in 1998 and encompasses approximately 307,000 square feet. This general office and public service building houses over 800 employees and is primarily occupied by the City of Denver's Department of Human Services. Their mission represents a commitment to working with community partners to provide resources and services to people in need making this a high visibility public facility serving large numbers of visitors each year.

The City of Denver first started considering energy efficiency upgrades to the building after collecting feedback from City facility managers. With its important place in the community and being one of the City’s largest buildings, the Castro Building was viewed as a top candidate for improvement.

Solutions

The building underwent comprehensive energy improvements beginning in 2012 which include sealing the building envelope, upgrading the building automation system, installing four new high efficiency boilers, and utilizing variable frequency drives on HVAC units to allow greater control and synchronization. The building also houses 30 kW of solar panels on its roof.

The building is currently serving as a pilot site for interior LEDs as replacements for T8 fluorescent lamps, the City is using the pilot to gauge lighting levels and occupant feedback to determine how to roll out LED retrofit to other city buildings. In addition, improvements have also been made to the parking garage serving the Castro Building. Energy savings to date have been significant, resulting in energy reductions of 36% at the Castro Building and 50% at the garage.

The complete list of energy efficiency improvements include the following measures:

Building envelope sealing
Installation of four high efficiency boilers
Installation of variable frequency drives on rooftop units, creating greater level of control and synchronization
Installation of frequency drives on fan controls
New temperature sensors & damper actuators installed in the rooftop units
Building equipment commissioning
New Web Servers and computers installed onsite
Upgrade of BAS from Inet to Niagra, enabling better use of economizer features
Photo cell controls installed in parking structure
Currently conducting demonstration project replacing 160 T8 fluorescent 4’ lamps with LED lamps

ANNUAL ENERGY USE

(Source EUI)

ANNUAL ENERGY COST

ANNUAL WATER USE

ANNUAL WATER COST

ANNUAL PLANT ELECTRICITY USE

ANNUAL PLANT ELECTRICITY COST

IN BUILDING ENERGY USE

IN BUILDING ENERGY COST

ACROSS NETWORK USE

ACROSS NETWORK COST

ANNUAL EMISSIONS

USE

COST

Exterior of the Richard T. Castro Building

Roof mounted 30kW solar array

City of Denver: Richard T. Castro Building

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Exterior of the Richard T. Castro Building

Roof mounted 30kW solar array