Re: [EnergyPlus_Support] Ground Temperature Input

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

It's a warning.  Usually rule of thumb for ground
temperatures (the slab program is really designed for conditioned spaces
-- but you could run once and get the usual indoor temperatures) is 2 deg
C less than the interior temperature.

If you use 18C and your interior temperatures are really in the 30C
range, then you will get cooling from the ground heat transfer and
illogical/inaccurate results.

At 06:59 AM 5/10/2011, Ethan Gill wrote:
> I also used this method for the
> unconditioned model, but the resulting temperatures were very high in the
> months of may to august (above 30deg. C). Also, a warning massage had
> appeared  that "Site:GroundTemperature:BuildingSurface: Some
> values fall outside the range of 15-25C".
> My questions are:
> 1. Is it is correct to use this method (Utility:Slab) for the calculation
> of Ground temperatures for an Unconditioned model? Can I use the default
> values (18deg. C for every month by EnergyPlus) only for the
> unconditioned model?
> 2. As the climate is a Hot and Dry Climate, so the ground temperatures
> will be high then what is the significance of this
> warning?

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