Skip to Main Content U.S. Department of Energy
FEDS - Facility Energy Decision System

What's New?

FEDS 7.0—Now Available

FEDS 7.0 marks yet another significant step forward in the continued evolution of the FEDS energy analysis software, adding enhancements that make it more powerful and flexible than ever, while just as easy to use. FEDS 7.0 now utilizes a full hourly simulation model and a number of related features to further enhance the accuracy and detail of its energy modeling capabilities. New HVAC and lighting technologies (including LEDs) have been added, the retrofit cost and performance model has been completely updated, and reports have been improved, among other enhancements.

Conversion to a Full 8760 Hourly Simulation Engine

FEDS 7.0 has been transformed into a fully hourly simulation capable of modeling each of the 8,760 hours in a year. This improves the modeling accuracy and response to drivers such as weather and occupant variability throughout each month over the previous simplified hourly method which simulated the operation of representative days of each month. While runtimes will increase, this change allows FEDS to meet more stringent modeling criteria, and enables a number of possibilities for added detail and specification related to occupancy and building system modeling going forward. As part of this change, FEDS is now able to make appropriate adjustments for leap years and daylight saving periods, where applicable, and users can specify the start day of the simulation (the day of the week that January 1 falls on). The accuracy of the existing seasonal/variable occupancy and building operation specification has also been improved by changes enabling the hourly simulation.

New HVAC Technology Options

FEDS 7.0 adds a number of new HVAC options to enhance the modeling of a number of building technologies including the following:

  • Variable Air Volume (VAV) Systems
  • Economizers
  • Demand Controlled Ventilation
  • Terminal Reheat
  • Subcool Dehumidification (aka, Central Reheat)

These advanced HVAC options are now available for specification in baseline building models from within the Ventilation inputs. Additionally, number of control options and setpoints are available for user input (or they can be inferred by FEDS based on your building type and climate zone, among other parameters).

Additionally, FEDS 7.0 expands the number of chiller type options to include screw and scroll compressor designs.

New Lighting Technology Options

Significant changes in the world of lighting continue with the phase-out of certain incandescent bulbs and increasing progress in the area and application of advanced lighting technologies such as LEDs. As such, FEDS 7.0 has added the following lighting to its vast inventory of available options:

  • Over 130 LED lamps and fixtures suited to a range of applications
  • Halogen lamps
  • Induction lighting
  • A number of additional linear and compact fluorescent choices

These added choices are selectable as existing lighting types and are also evaluated for cost-effective replacements.

Changes have also been made to the lighting inputs to make the specification and modeling of exterior lighting fixtures easier. A new "Fixture Location" input differentiates between Interior and Exterior fixtures and when Exterior is selected FEDS automatically sets the heat-to-space to 0% and infers appropriate utilization factors based on occupancy specifications.

Fully Updated Retrofit Cost and Performance Data with Enhanced Regional Resolution

The vast and growing database of energy efficiency measures that FEDS evaluates for cost effective retrofit upgrades has been thoroughly reviewed and updated. The performance and efficiency of available technologies have been assessed and current costs have been integrated. Additionally, regional labor rates, material cost factors, and sales tax rates have been updated, and expanded to provide significantly enhanced resolution. Whereas regional costs were previously modeled at the individual state level, FEDS 7.0 now models regional costs according to regions defined by the first three digits of the postal zip code. Zip code is a new input available in FEDS 7.0 and also helps set the state and weather station for U.S. locations. The impact on accounting for intra-state variations in construction costs is significant and further increases the accuracy of the results.

Additional changes to the FEDS cost model have also been made, including incorporating additional overhead and project cost layers into the base model. As usual, these are inferred and remain fully accessible and modifiable to the user.

Improved Report Writer

A number of enhancements have been made to the FEDS reporting functions. In addition to the existing report options, new Calibration Output and Retrofit Savings Overview reports are available. These are both spreadsheet formatted (.xls) reports; the Calibration Output is designed to make model calibration easier and the Retrofit Savings Overview report provides a building and site total summary of the energy and dollar savings potential identified by an analysis, along with estimated investment, payback, and greenhouse gas reductions. An enhanced version of the standard TXS report is also available, which includes graphical output of building energy use by end use as well as energy use intensities.

A feature of the updated reporting system is that users may open report files directly from FEDS, and without first generating the reports (the report files are now created automatically at the end of each FEDS run).

Data Updates and Other Enhancements

A significant number of additional enhancements and data updates are included, such as:
  • The ability to go directly to "Maximum Detail" inputs without first satisfying the FEDS "Minimum Set"
  • New pier floor type
  • New window options including high performance aluminum frames, additional low-e films, and low-e storm windows available for retrofit
  • Ability to model additional technologies within a building (up to 40 lighting fixtures, 20 motors and miscellaneous equipment records)
  • Improved design day capacity calculations
  • Updated equipment performance and other inference data improvements
  • Additional text description fields to aid in identifying use areas, lighting fixtures, and heating/cooling/hot water technologies. These descriptions are integrated within mapping features of the UI and are also listed on the retrofit reports (TXD and CSV)
  • The latest DOE/EIA discount and energy escalation rates.

FEDS 7.0 is now available! See "How to get FEDS" to order your copy today!


Now Available!

FEDS 7.0