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RE: Re: [EnergyPlus_Support] ground temperature

It is important to understand how eplus uses ground temps. look it up in the io ref (page 54 / pdf 101). For example, for conditioned spaces adjacent to ground, you should not use the undisturbed ground temperatures as the boundry condition under the slab. 

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <leeed2001@...> wrote:

I'm guessing you are saying that your DesignBuilder model used the default of 18 degrees for all year for the ground temperature.  You can enter monthly measured or assumed values in the Site:GroundTemperature:BuildingSurface object.  You can get a better approximation of these values if you use the CalcSoilSurfTemp utility.

On Tue, Nov 12, 2013 at 7:26 AM, yasin khan <yasinkhan683@...> wrote:
hello everyone
i am facing a problem in defining in ground temperature because when i export idf file from design builder in takes 18 degree C for all the 12 months as default value for my climate condition. however i change this value by monthly dry bulb temperature i don't know that this methodology is correct or not. So plz can anybody can tell me that i am doing the right thing or not and tell me the better way for ground temperature.

Edwin Lee, PhD
Engineer, Commercial Buildings Research Staff
National Renewable Energy Laboratory


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