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The ground floor was a fireplace. The upper level was just open beams, radiating out like the spokes of a wheel, onto which were placed mesh screens. the freshly, harvested hop heads would be dried on the meshes before being taken to the brewery.
The single oast house has no windows- does that mean it's still in use? It has the turret-like roof, but no chimney vent, so maybe it isn't. The triple row of oast houses do have their cute chimneys still, but also windows... which means that they are almost certainly converted into dwellings or other uses. I must admit, it would be fun to live in one. And, just for the record, I think they are a product of the Ag Rev and later- certainly the concept isn't nearly as old as malt houses.
Both these photos are from Geograph, and they are both Kent.