Radiant Surface in Design Builder 7 - Problem with maximum capacity control

asked 2021-12-20 08:32:40 -0600

maherz gravatar image

updated 2021-12-20 10:43:55 -0600

Good Morning/Evening everyone,

I am modeling a radiant surface for heating/cooling purposes (for an office building in Paris). I am in Detailed HVAC - Simple Data. I am aiming to set the maximum capacity delivered to the zone by the radiant system in order to asses thermal comfort. Problem is, looking in my results, more preceisely "Radiant + Convective heating" output, I notice that this maximum power is usually exceeded. (my heating design capacity per floor area is set at 30 W/m², whearas in my results I reach 76 W/m² in heating load from radiant equipments). This results in 100% confort hours met, which leads to mistake. Did anyone hade this issue in the past and managed to solve it ? I would be extremely glad.

Thank you and cheers ! Maher

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