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Maja, The air coupling option simply allows air to pass directly from one zone to another. As with many things in Type56 you can choose to specify a constant amount, a scheduled amount, or an input amount that will come from some other model or from an equation. The question, of course, is how to know how much air will flow from one node to another. In very simple HVAC systems you might know; if you have a VENTILATION supply in one zone and you know that the only return is in a neighboring zone then it is a fairly simple matter of setting the quantity of air that passes between the two nodes. In more complex systems you need to couple the Type56 thermal model of the building with an airflow model that will estimate the internodal air transfers. There are two options. One is TRNFLow, which is a commercially available add-on to Trnsys. It uses the same TRNBuild interface but allows you to define airflow links between airnodes. It uses an engine called COMIS to determine air flow rates. The other alternative is to use CONTAM/Type97. Type97 is a standard component and the CONTAM interface is freely available (https://www.nist.gov/services-resources/software/contam). The disadvantage is that you'll need to reenter a good bit of building information into the CONTAM interface. There is an example of a building coupled with a CONTAM airflow model in the .\Trnsys18\Examples\ directory if you want to have a look. kind regards, David On 04/05/2022 06:42, Maja Danovska via
TRNSYS-users wrote:
-- *************************** David BRADLEY Principal Thermal Energy System Specialists, LLC 3 North Pinckney Street - suite 202 Madison, WI 53703 USA P:+1.608.274.2577 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |