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info for EED 3
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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.
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
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).