Hello everyone,

I am a beginner modeler and i need you help on the classification of the floors within the office building I am modeling. In this building I have three types of floor I must classify and correctly insert in the Excel file: v4 1_Minimum Energy Performance Calculator_v3.

- There is a floor between the ground and an unconditioned space; from what I read from this previous question (https://leeduser.buildinggreen.com/forum/slab-grade-vs-slab-below-grade) it should be modeled as a mass floor, am I correct?

- Then, there is another floor which is about 1 m above an archeological area. I have therefore an air interspace between the ground and the bottom side of the floor, however, it is directly sustained by the foundations of the building. Its heat capacity is 63.80 kJ/(K*m2), which should be 3.12 Btu/(°F*ft2). Is this a mass floor or should it be classified as a steel joist floor?

- Finally, there is another floor which has a similar configuartion as the previous one, but with a smaller air interspace (10 cm) and a slightly different stratigraphy. Its heat capacity is 102 kJ/(K*m2), which is around 5 Btu/(°F*ft2). Same question as before, is this a mass floor or should it be classified as a steel joist floor?