District heat for floors and water heating in OpenStudio (HVAC Tab)

asked 2018-08-02 11:24:35 -0500

Raghda Derbel gravatar image

updated 2018-08-14 12:46:58 -0500

Hello everyone, I am working right now on a residential building that uses district heating to heat both floors and potable water. And since I am new in using OpenStudio, I encountered some difficulties in proceeding to the stage of the HVAC, I actually have done a little but I am not sure if I did the right thing and if it is enough, so if anyone could help me figure out how to make it possible to configure this system, I would be really glad :)

Here below is what I have done so far (for heating potable water); image description image description image description

And this is concerning floor heating (I am not sure if I did the right thing using "HW Htg Coil")

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If you have any remarks or suggestions, please don't hesitate :)

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use the zone hvac radiant or baseboard objects on your hot water loop. Right now you just have a air system providing heating, and it is one supply temperature for the whole air loop so some of your zones will get underheated/overheated.

mdahlhausen gravatar imagemdahlhausen ( 2018-08-14 19:47:42 -0500 )edit

So if I understood well I should add Zone HVAC Baseboard Rad Conv Water in the thermal zone tab as shown in this screenshot and then I have this in the HVAC tab for the Plant loop2 ?

Is it now correct ? Thanks for your help :)

Raghda Derbel gravatar imageRaghda Derbel ( 2018-08-15 08:11:42 -0500 )edit

Do you think that I should remove the coil (HW Htg Coil) from Plant loop 2 and Air loop HVAC 1 ? Because now that I understand better the functioning of these loops and that I added the baseboard in each thermal zone, I do not see anymore the utility of the coil there. Am I right ?

Raghda Derbel gravatar imageRaghda Derbel ( 2018-08-15 08:32:17 -0500 )edit

Are you trying to model radiant FLOORS or radiant BASEBOARDS? Those are two different things. Radiant FLOORS will require a radiant floor construction, and use a Zone HVAC Low Temperature Radiant object. See post here: https://unmethours.com/question/3514/...

egillmor gravatar imageegillmor ( 2018-08-15 09:09:30 -0500 )edit

Also, for your district DHW system: Rather than using a district heating object, I prefer to use a regular Water Heater object and just change the fuel type to District Heating. Otherwise your DHW usage will show up as heating end use rather than water system end use.

egillmor gravatar imageegillmor ( 2018-08-15 09:15:37 -0500 )edit