Pearce, P., Farmilow Fisher Environmental Ltd, UK
(free)This poster is an extract from a paper of the same title presently in print
Key differences between stone and plastic media wrt heat transfer
Plastic media has a far higher voidage than stone media (97% cw 35% for clean medias) and voidage connectivity is also greater. This means that the media can breathe/ventilate more readily as air flow resistance is much lower.
Material mass in a plastic media filter is therefore much lower than stone media at ~27 Kg/m3 compared to ~ 1500 Kg/m3 . The thermal inertia of plastic media is therefore much lower.
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