Table 6 Main parameters for SPI evaluation[21]
From: Ecological and economic evaluation of biogas from intercrops
Yearly | Optimum | Scenario 1 | Scenario 2 |
|---|---|---|---|
Corn silage (t DM/year) | 537 | 0 | 0 |
Corn silage SPI (m2/t DM) | 86,216 | 86,216 | 86,216 |
Intercrops (t DM/year) | 960 | 1,351 | 0 |
Intercrops SPI (m2/t DM) | 9,250 | 9,250 | 9,250 |
Grass silage (t DM/year) | 711 | 375 | 0 |
Grass silage SPI (m2/t DM) | 7,640 | 7,640 | 7,640 |
Cattle manure (t DM/year) | 1,393 | 895 | 931 |
Cattle manure SPI (m2/t DM) | 1,887 | 1,887 | 931 |
Electricity from grid (MWh/year) | 230 | 154 | 37 |
Produced heat | Â | Â | Â |
Total (MWh/year) | 5,038 | 3,159 | 1,412 |
Out of that for district heating (MWh/year) | 4,134 | 2,340 | 790 |
Electricity feed (MWh/year) | 3,827 | 2,574 | 978 |
CHP capacity (kWel) | 160; 160; 250 | 80; 250 | 160 |
SPI electricity (m2/MWh) | 53,437 | 19,305 | 18,327 |
SPI heat (m2/MWh) | 5,865 | 2,119 | 2,012 |
SPI total (km2) | 204.5 | 49.7 | 17.9 |