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Low Temperature Radiant System Schedule acting funny

asked 2025-05-20 12:17:44 -0500

Alex89

21 ●3

updated 2025-05-20 13:58:05 -0500

Aaron Boranian

14430 ●91 ●25 http://bigladdersoftware.com/

Hi everyone!

i am currently trying to implement a Low Temperature Radiant System, which is working and heating and cooling my rooms. Just not to the desired temperature at all.

I am aware that the System doesnt use the Thermostat SetPoint accoring to the E+ Input Output Documentation.

I have set a constant setpoint via the Cooling and Heating Low Water Temperature Schedule Name.

And i am still getting this kind of behaviour in the Analysis: image description

I have autosized most Inputs aswell as selected 2x as a Safety Factor.

Somehow the behaviour matches a former Weekend and Nights Off Schedule i had, but i even deleted it and still get these results. Does Anybody have any ideas what the reason could be?

Thanks in advance! Alex

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answered 2025-05-21 09:27:53 -0500

kwalkerman
1562 ●11 ●10 https://ep3.solutions

To set the control temperatures for ZoneHVAC:LowTemperatureRadiant:VariableFlow you need to set are the Heating Control Temperature Schedule Name and Cooling Control Temperature Schedule Name under the ZoneHVAC:LowTemperatureRadiant:VariableFlow:Design object:

image description

You may also need to check the availability schedule for your ZoneHVAC:LowTemperatureRadiant:VariableFlow:

image description

Is there other ZoneHVAC equipment in the zone as well? Depending on the outdoor air temperature, I'd expect to see the interior temperature deterior further with ZoneHVAC equipment being off for multiple days. If you post the IDF file (version 24.1, 24.2 or 25.1), I can take a look at it with EP3

Images generated by importing the RadLoHydrHeatCoolAuto.idf EnergyPlus example file into EP3

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Asked: 2025-05-20 12:17:44 -0500

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Last updated: May 21

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Low Temperature Radiant System Schedule acting funny edit