David William House, wearing his official Biogas Builder's hat, uses the newly invented ratchet strap compressor to put the hot water coil inlet bung in the bottom of the front side of the press-plastic digester. Want to know how to build this digester, made from 2x4's, rigid polystyrene and plywood? Keep reading...
The story here is that as temperature drops, you will need a larger and larger digester to get the same amount of biogas. What?? Yeah: here it is...
| Digester volume req’d at different temps to get the same amount of biogas |
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|---|---|---|---|
| °F | °C | Slurry vol? | |
| 95°F | 35°C | 100% | 1 unit |
| 85°F | 30°C | 150% | 1½x |
| 75°F | 24°C | 215% | 2x plus |
| 65°F | 18°C | 320% | 3x plus |
| 55°F | 13°C | 465% | almost 5x |
| 45°F | 7°C | 690% | almost 7x |
| Colder? | like, ginormous |
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(Please click on the small picture to the right to see the largest version of the image)
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