EED     

 

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EED - Earth Energy Designer

 - Dimensioning of heat extraction boreholes 

Developers:

bulletDr. Thomas Blomberg, Building Technology Group, 
Massachusetts Institute of Technology, Cambridge, USA
bulletProf. Johan Claesson, Dept. of Building Physics, 
Chalmers University of Technlogy, SE-412 96 Gothenburg, Sweden
bulletDr. Per Eskilson, Dept. of Mathematical Physics, 
Lund University, P.O.Box 118, SE-221 00 Lund, Sweden
bulletDr. Göran Hellström, Dept. of Mathematical Physics, 
Lund University, P.O.Box 118, SE-221 00 Lund, Sweden
bulletDr. Burkhard Sanner, Asternweg 2, D-35633 Lahnau, Germany

Für Rückfragen in Deutsch wenden Sie sich bitte an (Technical support in German is provided by):
Dr. Burkhard Sanner
(sanner@sanner-geo.de)


EED 3 new version


EED 3 Demo (3 MB) new demo version 3.12 (Oct 8, 2008)

Manual (PDF), 1,6 MB, 60 pages, revised May 26, 2008
 
Documentation and frequently asked questions (FAQ:s)

Please see this link for update info for EED 3


The main news of EED 3.0 are as follows:

bulletOptimization module that gives a list of best solutions for various parameters within specified ranges
bulletSimple cost calculation
bulletBritish units added. Easy conversion between SI and British units
bulletPc-program multilingual. New languages can be added.
Currently:  English, French, German, Hungarian, Italian, Spanish (Castilian), Swedish, Turkish, Portuguese, Polish, Dutch, Greek, Bulgarian.
Please see this link for current supported languages.
bulletMore configurations with large systems (798 as compared with 308 in EED 2.0)
bulletMore G-functions (6385 as compared with 2465 in EED 2.0)
bulletImproved accuracy (multipoles 1->10). Improved convergence on borehole length.
bulletHot water treated separately
bulletFlow rate can be given for whole system
bulletA lot of smaller improvements

EED 3.0 Screenshot of the optimization list in English and German:


EED 3.0 main menu in Greek:


Help needed for translation into other languages

We offer a free license of EED 3.0 if you make a valid translation into a new language.
If you wish to contribute, please contact us first in case of that no other is currently working on it.

See link supported languages
 

Background of EED

EED is a PC-program for quick and reasonably sound dimensioning of systems with ground source heat pumps. It is based on parameter studies with a numerical simulation model (SBM) resulting in analytical solutions of the heat flow with several combinations for the borehole pattern and geometry (g-functions). Those g-functions depend on the spacing between the boreholes at the ground surface and the borehole depth. In case of graded boreholes there is also a dependency on the tilt angle. The g-function values obtained from the numerical simulations have been stored in a data file, which is accessed for rapid retrieval of data by EED.

Calculation of brine temperatures is done for monthly heat/cool loads. Databases provide the key ground parameters (thermal conductivity and specific heat) as well as properties of pipe materials and heat carrier fluids. The monthly average heating and cooling loads are the input data. different methods of establishing a monthly load profile. A printed output report and output graphical processing are provided. 

The program has an easy-to-use interface. The borehole thermal resistance is calculated in the program, using the borehole geometry, grouting material, pipe material and geometry. The borehole pattern may be chosen at will from a database of 800 basic configurations.


EED 2.0

Manual (PDF), 360 kB, 43 pages, revised October 30, 2000

Earth Energy Design (EED) is a PC-program for borehole heat exchanger design. Its easy of use, short learning curve, quick calculation times and inherent databases make EED a useful tool in everyday engineering work for design of ground source heat pump system (GSHP) and borehole thermal storage. In very large and complex tasks EED allows for retrieving the approximate required size and layout before initiating more detailed analyses. Even for very small plants EED values the effort to do a calculation instead of using rules of thumb is worthwhile. 

In ground source heat pump system, heat is extracted from the fluid in the ground connection by a geothermal heat pump and distributed to the building. The fluid is then re-warmed as it flows through the ground. In cooling mode, the process is reversed. This is a renewable, environmentally
friendly energy source. This sustainable technique can be used for cooling and heating of houses, cooling of telecommunication switchboards, etc.

Version 2 of EED is being developed as a joint project by Docent Göran Hellström (Dept. of Mathematical Physics, Lund University), Dr. Thomas Blomberg (Building Technology Group, MIT), and Dr. Burkhard Sanner (Institut für Angewandte Geowissenschaften der Justus-Liebig-Universität, Gießen, Germany).


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Last modified: December 10, 2008