|
Matthias, I think the answer would depend a lot on the complexity of the HVAC systems and on the level of detail to which you would need to model them. The most comprehensive building models that I have done are for LEED projects (proposed building, proposed mechanical system, baseline (comparison) building, baseline (comparison) HVAC system, and lots of report writing). These projects can range from 70 to 200 hours of time with most coming in around 100 to 150. Again, though, that is modeling two buildings. To model just the one proposed building, I think you would probably be in the range of 50 to 150 hours. Some other thoughts for you, though (which I realize you didn't request... ;-) ). Every model, every building simulation tool that is out there is some simplification of a real process. The more assumptions the model developer builds into the model, the simpler the model is to implement but the less flexible it becomes. The fewer assumptions that the developer builds in, the more flexible the tool but the more complexity there is involved with implementing a system model. I have found it helpful to think of building energy modeling tools on a sliding scale where on one end are tools that are relatively quick to use, which have a LOT of built-in assumptions and which are therefore not very flexible. One the other end are tools that are very flexible in terms of what you can model but which are more time consuming to use. TRNSYS is definitely on the "flexible but complex" end of that scale - intentionally so. If you are trying to model a building that has some unusual features (radiant floors, natural ventilation, double skin facades, complex HVAC systems, etc.) in it then TRNSYS is a good tool to use, even though it will require more hours to implement the model. If the building has nothing but conventional envelope and systems then there is no advantage to TRNSYS (or other tools like it); you will spend an unnecessarily long time implementing the model. On the other hand, it may be quick to implement a model in another software but if the building has features that cannot be modeled by the other software, you need to change to another, more comprehensive or flexible tool. Best, David On 12/12/2012 09:30, Matthias Maier wrote: Hi TRNSYS-users, -- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |