Heat and cooling load in revit 2022

[gopigopi766]

Pls give solution for how to calculate heat and cooling load in revit 2022 version

[evgeny.kurbatov]

Hi @gopigopi766 

It sound like a simple question, but I am afraid that an answer can be longer than expected. For start just watch this video. 

Sincerely,

EK

[iainsavage · Accepted solution]

The heating and cooling loads tool has been dropped in version 2022.

You need to use the energy analysis tool and select the HVAC System Loads option.

This recent post might be of interest.

https://forums.autodesk.com/t5/revit-mep-forum/what-is-the-difference-between-havc-load-calculation-...

[gopigopi766]

I want to know about heat load calculation in 2022 version . It was converted to system analysis. Step by step procedures 

[gopigopi766]

Pls give step  by step procedure to get it

[gopigopi766]

I created a spaces and zone now how to get heating and cooling loads for given spaces from system analysis

[iainsavage]

Sorry, I haven’t used it yet and have similar questions myself.

@HVAC-Novice or @Kevin.Lawson.PE might be able to assist?

[gopigopi766]

Ok ,thank you. 

[Kevin.Lawson.PE]

After your spaces are placed go to the "Analyze Tab" then the "Energy Optimization" panel.  Click "Generate" to generate the analysis model and then click "Systems Analysis" and run the "HVAC Systems Loads and Sizing" workflow.  

You'll get a nice loads report and you can make a schedule of Analytical Spaces with the calculated load parameter. 

[iainsavage]

@Kevin.Lawson.PE can you please clarify though if there is a relationship between Spaces placed by the user and Analytical Spaces created when the energy model is generated?

Do we still need to create Spaces first and fill the whole model volume with Spaces including voids, shafts, plenums etc or does the energy model creation process work that out itself?

Should or shouldn’t we tick the Perimeter Zone option?

I’ve only used the energy analysis tool a couple of times so please forgive these rudimentary questions.

[iainsavage]

Thanks for that, clarifies things a lot.

Only a couple of points that I would come back on -

1. sliver spaces have to conform to certain geometric constraints, in particular they have to have opposing walls which are parallel to one another so any other shafts which don’t conform did have to be filled by Spaces, or their walls made non-bounding, for the heating & cooling loads tool to work.properly. Quotes from Autodesk help: “Sliver Spaces are narrow areas bounded by parallel interior room-bounding components.” and “It is critical to the heating and cooling loads analysis to account for the entire building volume. This includes areas that exist as cavities, shafts, and chases”
2. In the energy analysis tool do the analytical spaces pass load information back to the corresponding user-placed Spaces? When I tried to use the tool there didn’t seem to be any relationship between the two, even in terms of space names but I had concluded that I was doing it wrong and I haven’t had time to go back and investigate it further.

[Kevin.Lawson.PE]

1. Yes, you are correct, but I haven't had any problems with sliver spaces.   If you do have an oddly shaped shaft you can add a space to it. 
2. No, the Analytical Spaces do not pass information back into the Spaces.  Only Spaces pass information to Analytical Spaces.  It's important to note that this only happens when the Analytical Model is regenerated, so make sure you regenerate the model before running the loads.

[ceyhunyuzuak]

I appreciate it calculates loads with ease, it even takes shading elements and soil faced elements into the account as it hsould be, however Number 2. seems to be a great problem as:

1. analytical spaces can't read parameters defined in Family elements, which is a game changer problem for me since I can't list and filter those parameters in Analytical Space Schedules as I used to easily do in Space Schedules to size heating and cooling elements based on the calculations.
2. we can't place space tags that displays Heating Loads and Cooling Loads or similar values because there is no such thing as Analytical Space tag.

I can't see any practicle way to workaround those issues. Under such circumstances as a HVACR Engineer I can say that Revit 2022 will drop value of my work quite a bit. guess I will stick to 2020 for now. I don't know what I will do with my customers who use 2022, though.

[iainsavage]

Update: see @Kevin.Lawson.PE post here. https://forums.autodesk.com/t5/revit-mep-forum/the-heating-and-cooling-loads-interface-has-returned-...

@mrimmer 

[cristina.sanzJFMPA]

@ceyhunyuzuak You make a very valid point. I have been experiencing the same isues and it is BS that the newly calculated heatloads are not reflected in the space properties..... Have you found a workaround since?

[sdcartmell]

You can reactivate the legacy Heating and Cooling Loads tool by editing your revit.ini file:

About the Revit.ini file:
https://help.autodesk.com/view/RVT/2023/ENU/?guid=GUID-FE24D0A5-4603-41A5-BACB-4122993AFA6A

Misc settings in the Revit.ini file (including turning on the H&C Loads Analysis):
https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-B01A6B07-4FF2-4115-8B61-1274FAF9CC91

The helpful tip that led me to this discovery (thanks Autodesk help docs!)
https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-2DD2759D-3E3A-4AE7-BB37-0DF53981591E

[iainsavage]

As I said in part 14

[sdcartmell]

Great! Good on ya