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WEEG
Spreadsheet tool for calculating energy and GHG emissions
The AD tool provides a way of calculating energy use and production across a whole farm, with or without a digester. Details of the farm are entered including crop areas, livestock numbers and nutrient requirements. Most inputs have recommended values but these can be substituted with user inputs. If a digester is installed it is possible to select the feedstock inputs, including imported materials. Various options are given for biogas use and digestate application.  
 
DOWNLOAD       (zipped ADtool and manual)

 

Below are a number of screenshots from the tool, click on a picture to get a larger version.
 
Crop production
 
Animal manures & slurries
 
Imported materials
 
Digester
 
Fertiliser & digestate
 
Biogas
 
Summary sheet