TRACE™ 700 Load Express

TRACE 700 Load Express is Trane’s HVAC design tool for your light commercial design needs. This quick-and-easy software application uses ASHRAE-approved algorithms to calculate cooling and heating loads, as well as airflow capacities. TRACE™ 700 Load Express now offers most of the features and capabilities found in TRACE 700 Load Design software. TRACE 700 Load Express offers up to 20 rooms/zones and 4 system types: Constant Volume, Variable Volume, Heating Only, and Changeover-bypass.

Also, we’ve aligned calculation engines, file extensions and libraries to enable users of both programs to transfer archived files back and forth without any additional steps needed.his

TRACE 700 Load Express lets new designers and experienced users alike perform accurate load calculations in minutes with just five simple steps:

1. Select a weather profile
2. Define templates
3. Enter room parameters.
4. Describe the air-handling system
5. Assign rooms to systems


Release 6.3

Release 6.2

[Version 6.3.2] 9/16/2015

New Features

  • ASHRAE 170 calculations are now supported
  • Rooms can now be negatively pressurized
  • TRACE can not positively pressurize a space; this will still need to be done manually
  • If the ARAE feature is used, the designer will need to balance the airflows at the system level
  • Dramatic improvements have been made to evaporative cooling modeling (see updated user's manual)


  • Added units of cfm/sf and lps/sm to the infiltration UI
  • Scan for errors now includes some situations that require 'Retest Design Peak' to be checked
  • For all UFAD and DV systems, the user should never specify the clg coil leaving.  User inputs to lock-in these temps will be ignored
  • Updated the checksums report to account for two stage energy recovery
  • Changed the VRF condenser min. operating temp field lower limit from 0 to -35
  • VRF default return airpath is now 'Room direct'
  • Updated F1 help and the user's manual
  • Added an indicator for Static pressure adjustments to show that they are present
  • 'Loss coefficient' for slab on grade is now called 'F-factor'
  • Added window direction to the component tree view
  • Added 'People per 1000 sq. ft.' to the room checksums (to help with LEED modeling)
  • Added an install type designator to the version number (network vs stand alone)
  • Added new evaporative cooling library members 
  • Improved the way DOA units use energy recovery devices
  • Corrected an issue with the proration of heating coil capacity overrides at the room and zone level
  • Improved the system level cooling coil calculations when there is cooling demand in some rooms, but not others
  • Fan parameterization now works for VAV systems
  • Active chilled beam aux airflow calcs were improved to better account for natural convection
  • Corrected a load accounting issue between the reheat coil and the main heating coil during dehumidification
  • Improved the % sensible to occupied layer calcualiton for displacement ventilation systems
  • Corrected a problem with the sizing of zone level heating coils in PFPVAV systems (room and system levels were unaffected)
  • Corrected an issue with 62.1 airflow calcs when a VAV system was pushed to 100% OA
  • Bypass VAV systems will now provide the correct heating return airflow temp
  • Corrected an issue that could cause coil sizing units of "% ventilation and room latent" to be ignored when vent airflow was set to 0.
  • Corrected a problem that could cause the PFPVAV system to ignore coil oversizing at the zone level when the calculated heating airflow was too low
  • Adjacent room partition area is now correctly accounted for when using room and floor multipliers
  • Corrected a problem when modeling displacement ventilation w/ chilled ceilings where the space sensible loads were being incorrectly assigned
  • Corrected a problem with bicubic unloading curves
  • Design airflows are now limited to system block airflow when appropriate (rather than sum-of-peaks)
  • Corrected a static pressure issue associated with ERD's with bypass dampers
  • Heating only systems now correctly account for fan heat
  • Corrected a control issue that could occur when nearly all the space sensible load is assigned to the plenum
  • Corrected an issue that could cause return airflow values to be incorrect for UFAD PFPVAV systems when running in bypass mode
  • Corrected a weather profile issue during dehumidification
  • Improved the duct leakage calculation for UFAD PFPVAV systems
  • Changed the way floor load is calculated for UFAD VAV systems
  • Corrected an issue with UFAD VAV airflow calcs that could cause the coil and diffuser airflows to be different
  • Improved the chiller load-based sequencing  

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[Version 6.3] 9/6/2013

This update contains the following items:


  • Added Walls by Cardinal Directions report.

  • Updated the RTS calculation method (radiant fraction).
  • Updated the adjacent building shading algorithm for the Southern hemisphere.
  • Updated the 62.1 report to show all zone Vot when a zone-level coil is present.
  • Updated metric load rates in customized settings.

  • Fixed RTS table lookup load methodology when %glass = 100.
  • Fixed Schedule Editors so no overlap of time is allowed.
  • Fixed an error when room exhaust was entered as 100%.
  • Fixed the weather override "standard" default; it was not properly converting to metric units.
  • Fixed a reporting error on the system component selection report, Primary fan %OA.
  • Fixed an error in the heating coil oversizing for constant volume systems.

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[Version 6.2.10] 2/28/2013
This update contains the following items:

  • Fixed a control error in the DCV control.
  • Fixed the building areas report incorrectly showing Glass % instead of Skylight %.
  • Fixed the "Save As" feature that would crash when the user hit "Cancel".
  • Fixed the % load to return air. It would not allow 100% load to return air.
  • Fixed the main heating coil capacity override.

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[Version 6.2.9] 10/3/2012
This update contains the following items:

  • Added 90.1-2010 library members.
  • Fixed a reporting error on the room checksum report. The main heating coil was inadvertently adding the reheat coil capacity to the main heating capacity.


[Version 6.2.8] 3/30/2012
This update contains the following items:

  • Added five Mexican weather libraries with the origin filetype appended to the name.
  • Fixed an error that did not let the user change the U-factor of a copied door.
  • Fixed an error that did not account for skylight load in duplicate rooms per zone.
  • Fixed an error that did not consider the room humidity ratio from psychrometrics when calculating ventilation latent load in a few circumstances.
  • Fixed an error for Mexican weather files due to unit conversion error that presented very low humidity ratio values.
  • Fixed an error that duplicated the ventilation when ventilation units were %Clg Airflow and the cooling supply airflow was entered in cfm units.
  • Fixed an error that under-reported heating loads when VAV system preheat coils were manually undersized.
  • Fixed schedule graphs that were not graphing correctly.

[Version 6.2.7] 7/12/2011
This update contains the following items:

  • Added the ability to import EPW weather files.
  • Added ventilation library members to increase the ventilation CFM by 30% over the minimum ASHRAE 62.1 to gain the credit for LEED IEQ Credit 2.
  • Fixed an error preventing the copying of glass with no dimensions or percent in the file wizard.
  • Fixed an error that prevented the internal shading parameters from being shown on alt 2.
  • Fixed an error where adjacent floor plenums caused the space load to peak in odd months when retest peaks flag was set.
  • Fixed an error that caused UFAD systems to generate huge supply airflows when Std.62.1 flag was set and retest peaks flag was set.
  • Fixed an error where TRACE was using the design dry bulb temperature instead of the ground temperature for the partition delta T.
  • Fixed an error that caused the VAV reheat minimums to be too high when the system is oversized with respect to the sum of the peak airflows.
  • Fixed an error that resulted in the number of people being multiplied by 100 when the 62.1 diversity field was left blank.
  • Fixed a reporting error that displayed the wrong system type on the ASHRAE 62.1 report when a VAV system with baseboard heat was selected.
  • Fixed an error that caused excessive heating on SFPVAV systems when using the "Supply Air Reset Per Worst Case Room" with the "Use system default outside air reset" checked.
  • Corrected the U-value for an external door.

[Version 6.2.6] 9/1/2010
This update contains the following items:

  • Added Supply Air Reset Temperature offset to the Component and Project Tree views.
  • Added several space types per ASHRAE 62.1-2010 for ventilation calculations.
  • Removed options to view archived or T600-named library entries.
  • Altered the Walls by Direction report to include unusual orientations in a more straight-forward manner.
  • Changed the default U-value for internal shading type Sample from 0.07 to 0.70.
  • Fixed an error that incorrectly displayed the ventilation quantities when using a ducted, plenum or plenum/corridor vent deck.
  • Fixed an error that prevented certain types of shading from operating in the southern hemisphere.
  • Fixed an error that incorrectly assigned ventilation load to main coils when using specific dedicated OA systems in the design simulation.

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[Version 6.2.5] 3/19/2010
This update contains the following items:

  • Numerous calculation speed enhancements.
  • Changed the reporting of door areas in the Checksum reports to match that of window area reporting.
  • Added the ability to specify the file location for an imported weather file in the Weather Library.
  • Added functionality that will create templates based upon the Space Type Name when importing gbXML.
  • Fixed an error that would hide the heating ventilation quantity for some systems on the Room Checksums report.
  • Fixed an error that would account for adjacent floor loads twice when using multiple adjacent floors.
  • Fixed an error that incorrectly displayed the heating sensible coil load on the Peak Load reports.
  • Fixed an error that created large amounts of over/undersizing when using ASHRAE Standard 62.1 and Room Direct ventilation decks.
  • Fixed an error that incorrectly reported room ventilation quantities when using SFPVAV and ASHRAE Standard 62.1.
  • Fixed an error that incorrectly calculated the PFPVAV system exhaust quantity during heating design.
  • Fixed a skylight load error that would incorrectly read legacy values and not report the correct skylight loads.
  • Fixed an error that incorrectly ratioed reduced year weather when derived from full year weather.
  • Fixed an error that would ignore the Ez value in ASHRAE 62.1 calculations when Vot was less than Vou.
  • Fixed an error that prevented custom doors from being exported and imported via EXP files.

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[Version 6.2.4] 10/23/2009
This update contains the following items:

  • Added license activation to software installation.
  • Changed "% of Design Capacity Cooling Capacity" to only adjust the latent coil capacity and not airflows.
  • Changed the default Main cooling coil capacity units to be "% of Design Capacity by adjusting airflow" for new projects.
  • Changed the default Main cooling coil capacity units to be "% of Design Capacity by adjusting airflow" for legacy projects.
  • Changed the Report Viewer scrolling progress bar to display in the background.
  • Fixed an error that incorrectly calculated Voz when ASHRAE 62.1 was being used for system level ventilation calculations.
  • Fixed an error with heating driftpoint temperatures being flagged as potential errors.
  • Added Hot Keys for the Walls tab of Create Rooms.
  • Fixed the Walls By Direction report for walls that have the same orientation and multiple openings.
  • Fixed the glass/openings export in the Library/Template Editors.

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[Version 6.2.3, T7up623.exe] 9/3/2009
This update contains the following items:

  • Fixed an issue that would crash TRACE on the Walls tab of Create Rooms.
  • Fixed a crash that would occur when using the Heating Building Envelope Loads at time of space peak.
  • Fixed an error that would prevent the Design Cooling Capacities report from being displayed.
  • Fixed an error preventing the importing of .lds and older TRACE archive files.

[Version 6.2.2, T7up622.exe] 7/31/2009
This update contains the following items:

  • Added the ability to directly import glass from LBNL Window 5.
  • Enabled the template recovery function so each project (.trc) file that is opened is scanned for template problems and fixed.
  • Fixed an error that incorrectly calculated time lag based upon thermal mass between 180 and 185 lb/sf when using the TETD method.
  • Fixed an error which allows for more combined area when using openings than the total wall area.
  • Fixed an error that would crash TRACE when a new alternative is created and the rooms are using a previous alternative.
  • Fixed an error that would prevent TRACE Load (.lds) files from being imported into TRACE or Load Design.
  • Corrected three infiltration Heating Design definitions (Infil - Low rise office, Infil - High rise office, and Infil - Retail grocery store).

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[Version 6.2.1, T7up621.exe] 3/31/2009
This update contains the following items:

  • Added the ability to model multiple/different openings per wall including doors.
  • Added the ability to create custom door types in the Glass Library.
  • Added additional common mistakes to check for in Scan for Errors.
  • Fixed an error that incorrectly converted Height Above Ground when switching from IP to SI units.
  • Fixed an error that prevented the Entered Values reports from being viewed.
  • Fixed an error that prevented glass types from being imported into the Glass Library.
  • Fixed an error that would incorrectly calculate the coil capacity when using floor multipliers and specifying the coil capacity.

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[Version 6.2, T7up62.exe] 12/10/2008
Release 6.2 was distributed via CD to all active TRACE 700 customers December, 2008. This update contains the following items:

  • Added ASHRAE weather from 2005 Handbook of Fundamentals.
  • Added Scan for Errors feature which scans for common input errors or missing library information.
  • Added a glossary of common terms to the help file.
  • Added the ability to use reset and lockout tables for lights and miscellaneous utilization schedules.
  • Added an ASHRAE Standard 62.1-2004 output report to the Design Reports.
  • Updated system graphics.
  • Fixed an error that would omit the Summer Ground Reflectance when changed by a user.
  • Fixed an error that would ignore internal shading for windows that were defined with spectral glass.

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To install and run the program you will need: a Pentium® 4 or higher processor, Microsoft Windows® 7/8 operating system, at least 1 gigabyte (GB) of RAM,  and 500 MB of free hard-disk space (750 if Microsoft .NET Framework version 2.0 is not already installed).