EED – Earth Energy Designer


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 borehole size and layout before initiating more detailed analyses. Even for very small plants it is worthwhile using EED instead of rules of thumb. EED handles configurations from one borehole to large systems with up to 1200 boreholes. Annual base loads may vary between a few MWh up to several TWh!

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.

EED 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.


  • Dr. Thomas Blomberg, Blocon
  • Prof. Johan Claesson, Dept. of Building Physics,  Chalmers University, Sweden
  • Dr. Per Eskilson, Dept. of Mathematical Physics,  Lund University, Sweden
  • Prof. Göran Hellström, Dept. of Mathematical Physics,  Lund University, Sweden
  • Dr. Burkhard Sanner, Germany


The main new features of EED 3:

  • Optimization module that gives a list of best solutions for various parameters within specified ranges
  • Simple cost calculation
  • British units added. Easy conversion between SI and British units
  • Pc-program multilingual. Now available in:  English, French, German, Hungarian, Italian, Spanish (Castilian), Catalan, Swedish, Turkish, Portuguese, Polish, Dutch, Greek, Bulgarian, Romanian, Czech, Chinese (simplified), Russian, Japanese, Serbian (Latin+Cyrillic), Hebrew, Basque, Lithuanian, Vietnamese, Finnish.  New languages can be added.
  • More configurations with large systems (798 as compared with 308 in EED 2.0). Systems with up to 1200 boreholes can be analyzed!
  • More G-functions (6385 as compared with 2465 in EED 2.0)
  • Improved accuracy (multipoles 1->10). Improved convergence on borehole length.
  • Hot water treated separately
  • Flow rate can be given for whole system
  • A lot of smaller improvements

EED perpetual licenses (one-time fee)

New license, 1 user $1,200
New license extra per additional user $900
Upgrade from earlier versions, 1 user $900
School 3 users $1,200

EED annual licenses (yearly fee)

Company site, 30 users, per year $5,000
School site, 50 users, per year $2,500.00

Support for EED (spport available in English, German, Swedish, Italian)
EED support, 1 user, 1 year $200

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