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Log drying kiln idea

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You need to replicate on a smaller scale exactly what the commercial manufacturers produce only on a smaller scale.

However I would not consider investing in most of those on the market in the UK as they are inefficient and costly to run due to fundamental design flaws. If you are on the feed in tariff of course this doesn't matter so much.

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I have toyed with making a kiln along the lines suggested but when you look at what a commercial dehumidifier can remove it does not look so good. Say you have 10 cube of logs in the kiln thats around 5 tonnes of wood. previous tests have show you lose approximately 150 litres of water from a cube in the process of drying. Times that by your 10 cube you have 1500litres to remove. A quick search shows a commercial dehumidifier at 35C and 100% RH removing 38 litres per 24 hours and thats at it's optimum. So pretty much 40 days with the dehumidifier working at it's paper spec best which I am sure would not be achieved in the real world.


This was the dehumidifier spec https://www.energybulbs.co.uk/broughton+cr40+d+v+heavy+duty+industrial+dehumidifier/1691097694?gclid=Cj0KCQjwl9zdBRDgARIsAL5Nyn2Dpj0fgQiiCtWjOU8PSO5bbl0yqKZz23Us9Rs0Hg9MUscq3Vi82V0aAvaXEALw_wcB

Edited by Woodworks

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My dehumidifier (a decent brand, but not commercial) claims to remove 10 litres of water a day. In practice it will do 1 litre, maybe a little more. This is at about 80% humidity, 20C ish. Manufacturer's figures are wildly optimistic!

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You need to be getting temperatures well over 50 degrees to even come close to being effective. Ours runs at 65-75 for a week with enough air flow to completely change the air every 30 seconds and it still takes a week to dry 16 cube from 35% moisture to 15%.

You need high temperatures to increase the water carrying capacity of the air and then lots of air flow.

Ideally a heat recovery system is used on the wet air vent to remove the water from the air and send hot dry air back to the air inlet.

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