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A 200W vacuum pump moves about 80l of air a minute to probably 50-100mBar so probably about 100 minutes to shift 1m3 of water vapour. so 6000s at 200W - about 1.2MJ
I am sure there are more efficient pumps, and you probably wouldn't have to pump to this sort of pressure, but the order of magnitude is similar to just evaporating it.
I think it depends on how fast you want to dry your clothes, if you want to dry them very slowly, you don't need to pump the chamber down very far. In the extreme example, you don't need to pump it down at all - you can just leave it to dry. If you want to speed it up, which I guess is the point, you are going to have to reduce the pressure. A 200W vacuum pump moves about 80l of air a minute to probably 50-100mBar so probably about 100 minutes to shift 1m3 of water vapour. so 6000s at 200W - about 1.2MJ
Once the bag is squashed flat there's a serious restriction to the flow of vapour.
I realise this post is two years old, but I am starting a project to build a prototype vacuum pump dryer! At the moment I cannot find any evidence for previous designs, has anybody came across any?I am thinking as a point of departure that wielded aluminium could be used for the shell of the pressure vessel