5 min read

CES Energy Audit hits M&V mark with 36% Energy Cost Reduction

May 11, 2016 6:30:00 AM

3D-BIM-Image-CES.pngProjected Annual Savings & Incentives (2016) $56,180

In 2012, a nonprofit, wholesale electric utilities and associated services company indicated its desire to upgrade their Heating, Ventilation, and Air-Conditining (HVAC) systems within a  two story 24,856 square foot facility.  The Client's engineer entered into a contract with CES to provide an ASHRAE Level II Energy Audit.  

The Level-2 audit results in a concise report, briefing the Owner and Management Team on possible Energy Efficiency Measures (EEMs) such as no- and low-cost measures, modifications to system controls and building automation, operational changes, and potential capital upgrades. The findings included general expenses and overall performance metrics in addition to a means for the Owner to evaluate the EEMs and decide the direction to go with implementation.

CES decided to utilize The SRM Building Energy Performance Assessment (BEPA); a guided workflow solution that generates a comprehensive property-level assessment report.   It seamlessly incorporates leading industry standard protocols, ratings and benchmark systems, including ASTM, ASHRAE®, Capital Markets Partnership, Energy Star, IPMVP, LEED®, and the Environmental Defense Fund’s Investor Confidence Project protocols.

The Client had multiple goals for the project:

  1. A number of the systems components were into the remaining years of life expectancy
  2. To update the building to provide 
    1. an energy efficient
    2. reliable building
    3. that provides savings to the building owner
  3. To improve the working environment for building occupants
  4. To improve indoor air quality (IAQ)
  5. To improve Operations Efficiency

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The Energy Efficiency Measures

The new mechanical system will be designed following USGBC's LEED guidelines to provide a high efficiency building that will significantly reduce the operating cost.
  1. HVAC-Air Conditioning: Chillers: AirCooled: Centrifugal: Replace chiller with two (2) high efficiency chillers
    • Projected % Savings Over Baseline - 9.0%
    • The new mechanical system will consist of two high efficiency chillers. Each chiller will be capable of providing 70% of the building's cooling demands to provide an energy efficient redundant.
  2. HVAC-Air Conditioning: Primary Secondary Chilled Water Pump System
    • Projected % Savings Over Baseline - 4.0%
    • The pump system will consist of two variable primary pumps. One pump will be in stand- by. This will vary the amount of chilled water flow to provide only what is necessary. The pumps will be controlled to maintain a set pressure differential in the system.
  3. Controls: HVAC Energy Management System (EMS): Direct Digital Control:  Replace Existing Control System with a Building Automation System (BAS)
    • Projected % Savings Over Baseline - 9.1%
    • A new Building Automation System (BAS) will be installed with the controls system to be an open protocol BACnet compliant system. The controls will allow for computers/smart phones to access the building controls over the building's network. Alarms will also be programmed to alert selected individuals whenever a failure occurs. The BAS  will include occupancy sensors in each office and throughout the building to identify spaces that are occupied. The occupancy sensors will have a time delay to shut-off the lights and reset the temperature set point to the unoccupied temperature setting. The BAS will also have a schedule to turn off the lights with a timed override on the wall.
  4. HVAC-Air Conditioning: Replace all FTUs with Standard VAVs
    • Projected % Savings Over Baseline - 4.5%
    • The fan powered variable air boxes (FTU's) will be removed and new reheat VAV boxes will be installed in their place. 
  5. HVAC-Air Conditioning: Replace VAV Boxes with Properly Sized VAVs
    • Projected % Savings Over Baseline - 4.9%
    • The standard VAV boxes will also be replaced with new, and re sized according to load calculations based on office space use. The zoning of the spaces and thermostat locations will be evaluated and where possible remain in the same location of the existing system to reduce construction costs.
  6. HVAC-Ventilation: Air Handling Unit: w/ CO2 Sensors for Demand Control: Replace two (2) Air Handling Units
    • Projected % Savings Over Baseline - 9.1%
    • The air handling units are single-fan variable speed air handling units for both the first and second floors. The selection of the type of air handling unit was selected based on life cycle costs of the equipment and the physical restraints of the mechanical.
    • Demand Controlled Ventilation (DCV) will be utilized. This will measure the amount of carbon dioxide in the building and will adjust the amount of outdoor air in the building to maintain a healthy indoor air environment. To implement DCV, the exhaust/relief fans serving the building will need to be replaced to ensure the building maintains positive pressurization.
  7. Controls: Lighting Control System: Lighting Occupancy Sensors
    • Projected % Savings Over Baseline - 5.8% 
    • The interior lighting controls will enact two primary strategies intended to minimize energy consumption:  automatic shutoff via occupancy sensors in small, enclosed spaces and via a timeclock-based low-voltage control system in larger, open spaces, and daylight harvesting in all spaces receiving high, consistent levels of daylight contribution, notably the main lobby and private and open office spaces. In certain spaces lacking daylight and where personal safety is an issue, such as corridors illuminated by electric lighting, select lights will remain ON at all times during normal hours of occupancy.  In presentation spaces, notably the meeting and training rooms, flexibility will be provided to enable users to select preset light levels.

The Results

Project Total Cost:


Total Projected % Savings Over Baseline:


Last 12 Months Actual Energy Cost:


Baseline Projected (Weather Normalized, no ECMs):


Projected Annual Savings & Incentives (First Year):


Projected Life Cycle Savings Over EUL:


The Product

CES utilized SRS’s Peer Building Benchmarking™ proprietary data analytics, which has reinvented industry best practice methodology for energy efficiency benchmarking. The result is unparalleled visibility of your building’s:

  • Baseline and projected energy use and cost
  • Benchmark against key performance indicators to peer buildings
  • Identification of specific green building attributes that add financial asset value
  • Recommendations for specific energy efficiency retrofits and cost savings opportunities with compelling ROI and payback characteristics

All “industry standard” best practice analytics and content provides a professional, high quality BEPA report supporting internal and/or external stakeholder needs whether the mission is:

  • Pre-acquisition assessment (ASTM BEPA)
  • Pre-retrofit energy audit (ASHRAE Level I, II & III)
  • Lender underwriting & due diligence (energy efficiency finance programs)
  • Building labeling & disclosure regulatory compliance (Energy Star benchmarking)
  • Green Building Due Diligence™ (CMP Green Value Score)
  • LEED®-EB:OM certification gap assessment (LEED Existing Building screening)
  • Desktop assessment & retrofit prioritization (SRS Peer Building Benchmarking™)

Contact CES Today!
Comprehensive Energy Services

Written by Comprehensive Energy Services

Comprehensive Energy Services, Inc. is an award-winning, self performing provider and recognized leader in Design Build and Maintain Mechanical Contracting and Plumbing; providing a full range of advanced HVAC commercial, healthcare, and industrial services, including mechanical engineering design, mechanical construction, plumbing, IAQ, preventative maintenance and system maintenance throughout Florida.


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