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Best way to model a ceiling and raised floor

Hello guys, I am developing a simulation of a four-story floors building with VRF air conditioning system and, when I’m designing the floors, I had a question regarding the modeling of the ceiling and the raised floor. Based on this, I thought in three scenarios:

1- Modeling without ceiling and without raised floor: In this case, the building loses about 6 meters high, which reduces the area of walls and windows, distorting the model.

2- Modeling considering a height in the ceiling and in the raised floor: The height of the building is closer to the real one, but climatized area's volume increases, changing the HVAC's load.

3- Modeling the ceiling and the raised floor as zones: In this case, it would give more work and I would need to disregard the area of these zones in the total area count.

In your opinion, what would be the best alternative to model this building?

Thank you!

Best way to model a ceiling and raised floor

Hello guys, I am developing a simulation of a four-story floors building with VRF air conditioning system and, when I’m designing the floors, I had a question regarding the modeling of the ceiling and the raised floor. Based on this, I thought in three scenarios:

1- Modeling without ceiling and without raised floor: In this case, the building loses about 6 meters high, which reduces the area of walls and windows, distorting the model.

2- Modeling considering a height in the ceiling and in the raised floor: The height of the building is closer to the real one, but climatized area's volume increases, changing the HVAC's load.

3- Modeling the ceiling and the raised floor as zones: In this case, it would give more work and I would need to disregard the area of these zones in the total area count.

In your opinion, what would be the best alternative to model this building?

Thank you!