Why ZoneHVAC:Baseboard:RadiantConvective:Water has an air loop?

asked 2023-02-09 13:17:18 -0500

nagpalh
75 ●5

updated 2023-02-13 11:00:28 -0500

Aaron Boranian

14090 ●81 ●24 http://bigladdersoftware.com/

Hello all,

I want to simulate a simple single zone room with a single radiator unit with District Heating supplying the hot water to it. I want to use ZoneHVAC:Baseboard:RadiantConvective:Water. However, in the documentation I read that in addition to the hot water loop, there is an air loop with an air inlet and outlet node. I can not imagine it physically, how a radiator unit has an air loop. Has anyone simulated similar system before?

Thanks in advance.

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(original comment now posted as an answer).

Denis Bourgeois ( 2023-02-09 15:05:48 -0500 )edit

I agree with Denis, you should turn that comment into an answer.

Julien Marrec ( 2023-02-10 02:37:59 -0500 )edit

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answered 2023-02-10 05:50:12 -0500

Denis Bourgeois
2831 ●105 ●8 http://www.rd2.ca

The baseboard object output (not input) variables do include air inlet and outlet temperatures in degC. I suspect the inlet is simply the zone air temperature, the outlet: air temperature coming out of the baseboard. But I see no mention of an optional/required air loop. Am I misunderstanding your question? ... an answer (as suggested by Julien), originally posted as a comment.

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Or perhaps the baseboard's input field for inlet node name was confused for an air inlet node when it's actually for a water inlet node?

Or something was misleading from the Engineering Reference?

@nagpalh can you share a link to the EnergyPlus web docs where you read an air loop is needed for the baseboard?

Aaron Boranian ( 2023-02-10 08:48:35 -0500 )edit

@Denis Bourgeois @aaron Yes, the object does not need an air loop to be defined. However, I was confused because of the output variables which report Baseboard Air Inlet Temperature, Baseboard Air OutletTemperature and also Baseboard Air Mass Flow Rate. I couldn't understand where does these variables come from?

nagpalh ( 2023-02-11 09:14:19 -0500 )edit

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Why ZoneHVAC:Baseboard:RadiantConvective:Water has an air loop?

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Why ZoneHVAC:Baseboard:RadiantConvective:Water has an air loop?