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How to model air heater with the Design Builder?

Hi. I have a warehouse with natural air intake through the loading docks, mechanical exhaust on the roof. Heating provided by air heaters with water heating coil (100% recirculation). Hot water provided by gas boiler. And no air conditioning. So, i tried to use fan coil units that a quite suitable exept that i can't remove cooling coil. PTAC doesn't comply too. Is there any way to simulate this case?

P.S. I have a similar question: How to model air door (air curtain) in the warehouse? It is expected that the loading dock gates will be open approximately 50% of the operating hours. It would be ideal to take into account the fresh air flow through these doors too.

I would be grateful for any advice and help.