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Radiant slab - Design capacity

Hi all,

I´m trying to model the effect of a radiant slab on the comfort conditions inside a space. I´m interested on seeing the impact of a radiant system with a Design capacity of 15 W/m2.

Is there any way to model it without doing all the HVAC loopings?

I´m not really familiar with HVAC modelling and was intending to find something similar to the ideal air loads method. I´ve tried with the ZoneHVAC:LowTemperatureRadiantVariableFlow object, but it requires all the HVAC connections.

I´m probably leaving a lot of factors on the side, but I had assumed it would be enough to define the Design capacity for it to be taken into account.

Thanks! Rafael