Using the ASTMC1340 convection algorithm in E+
Hi all,
I’m trying to model a ventilated roof cavity, completely unconditioned, with a few openings (but tbc where and how big etc). Right now I’m testing a few different infiltration rates to see how the cavity temperature changes. But I’d also like account for the internal convection coefficient, which will change as a function of the air movement. I’m trying out the ASTMC1340 algorithm which should be a function of air speed (among others), but I can't figure out how to change this air speed parameter...
I'm currently trying
ZoneAirVelocity,
Room1,
0.2;
... but this doesn't seem to work. Any ideas?
@Jroberts what simulation tool are you using? Please mention it in the title or body of your post, as well as add a tag so that others can provide better help.
Sorry Aaron, first time here, I've clarified I'm using E+
@Jroberts thanks for updating your post!
Can you upload your model to Google Drive, Dropbox, etc. and then share a URL for others to download? That would help others provide better solutions.
I figured out the answer from the E+ source code. E+ calculates the velocity based as the air change rate multiplied by the cube root of the volume of the thermal zone
@Jroberts nice! Glad that you found a solution. You can "self-answer" your own question by creating a solution post below, which lets others know that the solution works. Plus, other users can up-vote your solution and give you karma points.