Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
@jlerazo You said 1000 spaces, but you did not say how many thermal zones. Most users assume that fewer zones will speed up the simulation, but this can be counterproductive in large models. One of the biggest run-time hits can be the internal thermal radiant exchange within a zone where every surface exchanges with nearly every other surface. For a simple zone with 6-12 surfaces, this calculation goes quickly. For a zone with 100s or 1000s of surfaces, the computation time to solve the matrix grows geometrically (I may not have the right growth term, but you get the point). Other considerations are the number of surrounding shading surfaces, the selected solar distribution option in the building object, the quantity of output, daylighting, thermal comfort models (KSU model is slow), etc.
