Hi All,
Couple of questions with this?
- Do you trust Revit heating and cooling calculations? I mean after you modify all the building materials and weather information do you do your calcs with Revit or a third party laod calculation software?
- How about duct and pipe sizing? Most of consultants do those with other tools.
- I have been exporting revit spaces as gbXml to E-20 to do the load cals but I need to mannually input all those calcs back into Revit. Is there a faster way of doings that?
- And lastly most of the clients don't like the way Revit shows the calculations Report. Is there a way to customise those outputs and get them shown in the way I want?
Cheers,
Mehdi
Solved! Go to Solution.
Solved by vitaliy5151. Go to Solution.
The heating and cooling load calculations in Revit uses the RTS method published in ASHRAE Handbook of Fundamentals (2005 edition). This approach calculates the radiant components for people, lighting and internal loads for twenty four hours prior for each hour of the design day. Occupancy fraction as specified by the schedule is used along with the convective and radiant components. This will almost always result in sensible cooling load for people and lighting below the typical sensible load based on activity type. A brief summary of the calculation method can be found at:
New HVAC designer here trying to learn how to use revit for calculations. is the 2018 version still not working? It seems that everything is always undersized or wayyyyy oversized.
Thanks
I am going to test a small example project this week. I will compare HAP results with Revit calculations in different versions like 17, 18 and 19. I'll post the results when i finish it.
So far with what I have been finding if you are very very careful about what data you are putting in then you are able to get similar results to hand calcs.
So a few questions when getting this back. Why do the level summarys not add up to the whole building loads, when looking at the peak loads should I use the space peak load or the zone peak load?
Thanks
Do you get change the U factor from default values!?
@mohammedjazim25 wrote:Is it possible to edit the u values of components in revit ???
Hello,
I can't understand why the revit doesn't show the load from partitions. If I create spaces unconditioned the load from internal walls (partition) didn't appear in the results. Do you guys know why!?
It's work if create a special zone and change the set point to higher temperature, but it's fraudulently way.
In this case you are considering a method of conceptual mass, right? but i'd like to use just the construction elements for load calculation.
Is it possible create new speficications for construction elements?
Hi @all,
I am currently working on an exemplary investigation of thermal load simulation with Revit. Took me already several months and will be published in a german version in 03/2019. I think I will translate it, but it should take me some time. This means a load of non-profit work for me and I will only start if there is some serious interest or support.
I figured out the precise problems (also some wrong calculations done by Revit in simple One-Dimensional Steady-State Conduction or at least simply wrong declaration of important parameters leading the user to a false track) and have several suggestions for Autodesk how to fix the "load" of problems and also how to make Revit MEP more interesting for use in HVAC-eigineering. Without third party software, means no extra costs for another license ...
For sure only if Autodesk Inc. is interested in solving their problems and establishing Revit not only as half-useable BIM Software. Still a long way to go, but I think it is worth it. Getting one step closer to integrated planning process.
Feedback welcome!
Greetings from Germany,
Fabian
It is a pity, but in the 2019 version the problem has not been fixed. But in the calculation you need to add only two variables! Is it so hard to implement, Autodesk?
Thats great to hear that, hope to meet with you and your article asap
because (for someone who wants to summarize all the works digitally by end-to-end consept) from design to operations these calculations are extremly valuable
bests from İstanbul/Turkey
Any progress in this subject from Autodesk in the latest version of Revit?
Have you checked the new features list?
Wow 10 years went by so fast! Too bad they still haven't fixed the software that we pay thousands of dollars per seat for. Maybe next year!