Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

GSHP with Radiant, no flow in radiant loop

asked 2019-01-24 16:46:12 -0500

avril14 gravatar image

updated 2019-01-27 09:46:52 -0500

I'm modeling a GSHP loop, with secondary loops for radiant heating and cooling. I'm using the water-to-water heat pump component to transfer heat from the GSHP loop to the secondary loops. Right now there is no flow in the radiant loops and I can't figure out why.

GSHP loop is set up like this, with the water-to-water heat pump on the demand side. image description

Radiant hot water loop is set up like this image description

I am really stuck on this. If anyone has any insights please let me know. Thank you!

edit retag flag offensive close merge delete



The heat exchanger component can sometimes not be autosized correctly. It assumes a really high Delta T between the loops and it ends up being a really small flow. If you could upload your .osm file it would be easier to tell what's going on.

I modelled a similar scenario and I had the same issue.

Luis Lara gravatar imageLuis Lara ( 2019-01-25 07:44:07 -0500 )edit

I tried hard sizing the heat pump but that didn't have any effect. You can take a look at the file here if you have any other ideas. link text Thank you so much!

avril14 gravatar imageavril14 ( 2019-01-25 11:46:35 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2019-02-01 11:09:58 -0500

avril14 gravatar image

I managed to figure this out eventually. For anyone else having the same issue, I made a few changes but I think what ultimately fixed it was: - Re-ordering the components in the Thermal Zones tab so that the Radiant elements were first in the list. - Adjusting the internal source constructions to make sure the radiant loops were between the right layers. - If using the constant flow radiant, changing the temperature schedules to be controlled by Outdoor Air Temp instead of the zone air temp.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer


Question Tools



Asked: 2019-01-24 16:46:12 -0500

Seen: 135 times

Last updated: Feb 01