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Years-Long Study Demonstrates Significant Energy Savings in Offices

Dec 22, 2021 8:45:00 AM

An extensive third-party study from the National Renewable Energy Laboratory (NREL) demonstrates total building energy savings of up to 31% in office spaces with 75F's IoT Building Management System, a savings range achieved with no other retrofits or building changes.

NREL is a national laboratory of the U.S. Department of Energy (DOE). Researchers there cultivated the data in their report by leveraging DOE building benchmarks and characteristics across multiple cities, annualized to capture total building energy savings as well as heating, ventilating, and air conditioning (HVAC) electricity and natural gas energy use intensity (EUI) reductions. The report includes 14 different building types with two vintages each and covers 857 U.S. climates, resulting in more than 100,000 unique energy saving outcomes.

In this post, we look at results from small, medium, and large office spaces.

Small Offices

Small office building energy consumption is based on a one-story building with 5,500 square feet, an air-source heat pump for cooling and an air-source heat pump with gas furnace as backup for heating. Distribution and terminal units include single-zone, constant air volume air distribution, with one unit per occupied thermal zone.

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Small offices saved up to 26% of total building energy with 75F® Dynamic Airflow Balancing and 75F® Outside Air Optimization. HVAC electricity EUI savings commonly reach between 50% and 70% in retrofit applications and between 65% and 80% in new construction applications. 

READ THE WHITE PAPER

Medium Offices

In the NREL report, medium office building energy consumption is based on a three-story building with 53,600 square feet, a packaged air conditioning unit for cooling and a gas furnace inside the packaged air conditioning unit for heating. Distribution and terminal units include a VAV terminal box with damper and electric reheating coil.

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Medium offices saved up to 31% of total building energy with 75F® Smart VAV With Reheat and 75F® Outside Air Optimization. HVAC electricity EUI savings commonly reach between 40% and 60% in retrofit applications and between 40% and 70% in new construction applications.

READ THE WHITE PAPER

Large Offices

Large office building energy consumption is based on a 12-story building with 498,600 square feet, a gas-fired boiler for heating, a water-source DX cooling coil with fluid cooler for a datacenter in the basement and IT closets in other floors; and two water-cooled centrifugal chillers for the rest of the building. Distribution and terminal units include a VAV terminal box with damper and hot water reheating coil, except for the non-datacenter portion of the basement and IT closets that are served by CAV units.

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Large offices saved up to 23% of total building energy with 75F® Dynamic Chilled Water Balancing, 75F® Smart VAV With Reheat, and 75F® Outside Air Optimization. In retrofits, HVAC electricity EUI commonly reached between 30% and 40% savings, and natural gas EUI between 60% and 80%. In new construction, HVAC electricity EUI typically decreased between 35% and 50%, and natural gas EUI between 60% and 90%.

READ THE WHITE PAPER

Topics: Energy

Lauren French

Written by Lauren French

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