Environmental Design Solutions Limited (EDSL) was formed in 1989 to commercially develop Tas Software. EDSL sells Tas software and consultancy services using Tas. EDSL believe that the mixing of development, consultancy and software support leads to a focused software product, with quality support available to end users.

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Tas Version 9.1.4

Changes since Tas 9.1.3.1


  • Updates to UK & ROI Building Regulations: Tas 9.1.4 uses version 3.5a of the EPCgen, BRUKL, BERgen and BRIRL programs. These are now required in order to lodge any new EPCs.
  • Plant Modelling Macro: The macro includes new options for cooling. Users can now enter different COP values according to External Dry Bulb Temperature, External Wet Bulb Temperature or by Month. Wet or dry side free cooling can now be modelled, as can cooling tower fans and condensor pumps.
  • New NCM Databases: Version 3.5a of the NCM Activities and Constructions databases are installed as part of this release. Although the calculation method for UK & ROI Building Regulations has not changed, users should update their projects to include these databases for all PartL2\EPC Projects. For more details, see the release notes in Tas Manager. Changes in the internal conditions between NCM v3.4a and NCM v3.5a are indexed in the following table:

Table of changes to NCM Internal Activies between v3.4a and v3.5a
  1. Lighting Factor - the magnitude of the overall lighting gain has changed for the whole year.
  2. Lighting Profile - the lighting schedule has changed for one or more hours of the year.
  3. Target Illuminance - the target illuminance level, in lux, has changed. This will affect daylight controls.
  4. Humidity Limits - the humidity upper/lower limit(s) have changed for one or more hours of the year.
  5. Occupancy Sensible - the occupancy sensible gain has changed for one or more hours of the year.
  6. Occupancy Latent - the occupancy latent gain has changed for one or more hours of the year.
  7. Equipment Sensible - the equipment latent gain has changed for one or more hours of the year.
  8. Equipment Latent - the equipment latent gain has changed for one or more hours of the year.
  9. Temperature Limits - The temperature upper/lower limit(s) have changed for one or more hours of the year.

To download Tas version 9.1.4, click here.