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Re: [EnergyPlus_Support] outputting surface temperature



This seems like a very bad idea. Either your wall is 1D or your interested in average results if you want to use E+. If your interested in temperature distribution across the wall then you need to use a 2D or 3D tool. You cannot capture the effects of temperature variation with a1D tool like E+ except in a very average way by correcting using a multidimensional tool. Suggest for 2D use Therm. For 3D there are many good finite element tools pick one.

On Mar 20, 2013 1:16 AM, "floradilys" <flora.salim@xxxxxxxxx> wrote:

 

Hi all,
We are doing a comparative analysis between physical and digital simulation to measure the performance of different facade design.

We are all quite new to EPlus and my experience in EPlus has been limited to basic analysis of thermal zones to calculate energy consumption.

What we need to get out of EPlus is the profile of external and internal surface temperatures in order to measure the performance of the facade in regulating the heat transfer.

If we can get the surface temperatures from the inward and outward facing surfaces, then we assume we can calculate the difference that indicates the performance of the facade.

One building physics expert told us ePlus can only return a single number for surface temperature and a temperature profile through an element, so for a wall, it will give us a 1D slice through the wall, and he said that one way we can get the temperature distribution across the surface is to split the surfaces to very small elements and get the surface temperature of each. Is this correct?

If it's true, can you please advise us how we can prepare the simulation launch file and the required input and output parameters?

How to set up the IDF file to output the surface temperature, ignoring all the other requirements? i.e. we don't need to define any HVAC and electrical systems and operational schedules, we only need to define the materials, constructions, surfaces, and thermal zones, weather data of a single day (set to match the radiation temperature of the halogen lamp in our physical simulation), and then analyse the surface temperature and extract the heat transfer value.

Your help and advice are very much appreaciated.



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