¿What temperatures should I use in GroundHeatTransfer:Slab:BldgProps Object?
Hi all! I am using slab preprocessor to calculate grund temperatures in small housing simulation. However, I have a doubt. In the object GroundHeatTransfer:Slab:BldgProps is recommended run a fisrt simulation to input the indoor air temperatures (12 months). So, I would like to know if this first simulation to catch indoor air should have HVAC on, or without HVAC? (in my case the samll house just have heating in winter, and not cooling at all).
Thank you very much in advance!
You might consider using the Kiva foundation model in EnergyPlus instead; it allows running a single integrated energy simulation that incorporates foundation heat transfer for each hour/timestep.
Hi shorowit, Thank you! I really dont know how to use Kiva in my case, my house is just with flat floor without vertical insulation, is a flat terrain. There I suppose vertical insulation in 0, but in the input Field: "Interior Horizontal Insulation Width" I dont know how set the size of insulation in whole floor.
That Kiva field is intended for horizontal insulation that is, say, 2-4 ft around the perimeter of the floor. If the insulation covers the whole floor, just include it in the floor construction.
I did it, but the heating loads resulted too low (comparing with default ground temp of 18ºC or the use of Slab pre-processor). Heating loads were too low even when I took out the insulation (for testing). I dont know what Kiva is doing with the ground temperature. No warmings were generated in my model. Thank you again.