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EDSL TAS - how does the HVAC work

asked 2016-03-21 10:05:01 -0600

updated 2016-03-21 10:12:01 -0600

I am looking into potentially using TAS modelling software but I am not very familiar with it. Does anyone know how the HVAC components work? Does it cover the load once calculated for the year or does the HVAC cover the load timestep by timestep? Does anyone know if it can model chilled ceilings and DOAS systems, and if it can how it does this?

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answered 2016-03-21 13:36:24 -0600

updated 2018-10-09 09:01:03 -0600

Hi Annie,

Tas can certainly model DOAS systems and chilled beams. I would be glad to provide you with a demonstration and go over any questions you had regarding the software to help you get to grips with it.

We have good documentation for our Tas Systems application in the installer of Tas and very good support. Tas Systems, our HVAC and controls simulation software, is similar to the way E+ does its HVAC simulation, but we can handle more complex waterside and airside configurations. In Tas Systems you can either build out your schematics using drag and drop components (or drag and drop pre-built systems you have saved in a library) or use a system wizard to generate a good starting point for say your VRF system with natural ventilation and then modify as necessary. Tas is ASHRAE 140-1 compliant and uses its own fast proprietary simulation engine. Tas Systems calculates a new ‘heat balance’ at every hour.

Tas can also account for the thermal lag through a radiant slab.

Please let me know if you would like a Tas demonstration/trial, and we can arrange one in the coming weeks.

(Tas can be downloaded here:

Best, Michael Sawford (EDSL)

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@MSawford could you elaborate what you mean when you say Tas can handle more complex waterside and airside configurations, maybe give me some examples. You say Tas can model chilled beams but what about radiant slabs, can Tas calculate the thermal lag through a radiant slab over the course of a day, or week?

Annie Marston gravatar imageAnnie Marston ( 2016-03-21 20:38:13 -0600 )edit

I have actually answered the same question regarding more complex airside and waterside topologies on the Slack Unmet hours channel, I don't believe I am able to upload images here. However, I have posted links to the comments on the Slack channel:

Example 1:

Example 2:

Example 3:

I stand to be corrected with regards to any of these examples. Hope this helps.

MSawford gravatar imageMSawford ( 2016-03-22 09:37:43 -0600 )edit

Would it be possible to put something here? I can't get access to these file.

Annie Marston gravatar imageAnnie Marston ( 2016-03-22 12:16:44 -0600 )edit

TAS can model radiant heating and cooling systems as well, such as underfloor heating/cooling.

Try these, can't upload images on the website as far as I can see, if it was possible I would gladly upload the images:

Example 1: TAS can handle complex topologies. First I have attached an example of a rather complex waterside system, which I don't think any other package could simulate, although I stand to be corrected on that. My understanding is that this topology would be impossible to simulate in E+.

MSawford gravatar imageMSawford ( 2016-03-22 12:40:39 -0600 )edit

Example 2: The attached blended system is not so complex, but again isn't easy, maybe impossible (?), to recreate in E+. The idea is to have a single chiller produce 6C chilled water for the AHU, then have a tank as a store that is set to use the 6C chilled supply to then maintain a supply to chilled beams at an elevated temperature, in this case 14.4C. There's a cooling tower to take advantage of the higher beam return temperature, although that turns out to be less beneficial than you might think if the chiller...

MSawford gravatar imageMSawford ( 2016-03-22 12:41:32 -0600 )edit

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Asked: 2016-03-21 10:05:01 -0600

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Last updated: Oct 09