Open Studio: Modelling a mechanical ventilation system (no coils) and a baseboard:radiantconvective:water system for 2 zones

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asked 2014-12-05 04:14:24 -0500

KDE
41 ●2

updated 2014-12-05 04:19:03 -0500

Hello,

I want to model two zones which are connected on one mechanical ventilation system without any coils. So pure for ventilation purposes. These 2 zones must be heated by radiators ( baseboard:radiantconvective:water system), which are connected on one hot water plant loop (so on 1 boiler).

In Open Studio, tab 'Thermal zones', I think I have it implemented on the right way, but I don't know how to do it in the tab 'HVAC system' (I can't add these baseboards in this tab, only in the tab 'thermal zones').

Can you help me?

I would like to give you my OSM file to have a look but don't know how on this platform.

Thanks in advance!

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answered 2014-12-05 08:53:08 -0500

Kyle Benne
6027 ●4 ●9 https://www.openstudio.net/

Your baseboard heaters should look something like this when viewed in the thermal zones tab.

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Next switch over to the hvac tab and add a hot water plant to supply the baseboard heater. There is no template for a generic hot water plant, so you need to add a blank plant loop and populate it with a pump, a boiler, and a scheduled setpoint manager on the supply outlet node. It should look something like this when you are done.

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Now switch back over to the zones tab and add the baseboards to your new plant.

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If you go back to hvac tab you should now see the baseboard heaters attached to the plant.

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Now add an empty air loop system to provide the ventilation.

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Add an air loop hvac outdoor air system, a fan, an air terminal single duct uncontrolled. (or variable speed fan and vav terminal if that is the case) It should look like this.

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Now click on either the splitter or the mixer and attach the zones.

image description

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The description is very instructive. I will admit though that I would find it more intuitive to have the coil water baseboard heating added to the library as an object that could be added to a plant loop.
https://www.dropbox.com/s/ficnlcquc9e...

MattStewart ( 2015-03-22 04:09:49 -0500 )edit

As a new user, the images really helped. Thanks

I'll add a couple more details that I needed when switching from ideal loads to hydronic:

Moving from ideal loads to this loop, you'll need to add a design day weather file (ddy).
For the setpoint manager on the supply side, you set "control variable" to "temperature".
In the zone section, as with ideal air loads, you need to have a "heating thermostat schedule" and a "cooling thermostat schedule", even if you don't have any cooling equipment.
Under simulation settings, turn on zone/plant sizing calculations if using auto-sizin