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Carvel State Office Building
Carvel State Office Building

Showcase Project: Carvel State Office Building

Sector Type

State Government

Location

Wilmington, Delaware

Project Size

302,250 Square Feet

Financial Overview

Project Cost $5,960,000

Annual Energy Use

(Source EUI)
Baseline (2008)
262 kBtu/sq. ft.
Actual (2014)
208 kBtu/sq. ft.

Energy Savings:

20%

Annual Energy Cost

Baseline (2008)
$775,000
Actual (2014)
$530,000

Cost Savings:

$244,000
Background

The Carvel State Office Building presents a unique opportunity to implement both larger scale energy conservation measures (ECMs) such has heavy mechanical systems alongside standard water saving and lighting measures.

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By using an energy services company (ESCO), the State is confident that Carvel will be able to generate guaranteed savings, serving as an ideal showcase facility. The project achieved a savings of 4,563,975 site kBtu per year (equivalent to 16,049,475 source kBtu) and 20% of the building’s baseline energy consumption. In addition, the annual cost savings was $244,000.

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Solutions

The construction phase of the performance contract began in July 2008 and lasted through March 2014. The project focused first on implementing low-/no-cost energy ECMs before introducing more comprehensive measures.  The State introduced 12 ECMs ranging from water and lighting improvements to heavy mechanical equipment such as HVAC improvements.

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The following is a list of energy efficiency initiatives implemented at the Carvel State Office Building:

  • Energy efficient lighting for 3,000 bulbs by retrofitting fixtures, downsizing from T12 to T8 lamps and upgrading to LED exit signs: Savings $84,384
  • Lighting controls such as the installation of 400 occupancy sensors in bathrooms, mechanical rooms and perimeter offices most impacted by direct sunlight and intermittent use: Savings $8,774
  • Building automation system upgrades establishing control sequences of: demand ventilation, night setback for unoccupied spaces, morning warm-up/cool-down and chilled/hot water temperature optimization. Also consists of testing and balancing HVAC equipment: Savings $39,368
  • Cooling tower optimization including the installation of three variable frequency drives on cooling tower fans and three pulse power conditioning systems: Savings $5,470
  • Premium efficiency motor installation for eight motors: Savings $1,116
  • Insulated hot water piping for 11th floor mechanical room: Savings $1,066
  • Variable volume piping featuring variable frequency drives on the condensing water system and automatic isolation valves on 10 air handlers and 153 core heat pumps: Savings $45,279
  • ENERGY STAR transformers to replace seven standard models: Savings $4,846
  • Heat pump replacement of 613 original perimeter pumps with high efficiency equivalents. Audit of the facility found 40% of the heat pumps were not fully operational at project baseline: Savings $30,652
  • Roof-mounted 10kW photovoltaic system, expanding existing system for a total of 20kW: Savings $1,517
  • Water Conservation to include the installation of 55 bathroom aerators: Savings $2,279
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Other Benefits

The State of Delaware achieved an ENERGY STAR® rating of 75 at the conclusion of the project.

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