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In EnergyPlus/OpenStudio, an adiabatic boundary condition applies a they same boundary to both sides of the construction. This means that heat is allowed to be stored in the wall, but it cannot transfer through.

If you don't want any heat flow at all, you can either remove the wall from the simulation altogether OR you can define a construction with a very low U-value as you mentioned.

In EnergyPlus/OpenStudio, an adiabatic boundary condition applies a they the same boundary to both sides of the construction. This means that heat is allowed to be stored in the wall, but it cannot transfer through.

If you don't want any heat flow at all, you can either remove the wall from the simulation altogether OR you can define a construction with a very low U-value as you mentioned.