Eco-friendly wood dryer humidifier

[chatelot16]

you saw the problem of drying calcium chloride: it does not happen by itself ...

for the vacuum pump, there is no hope that the water vapor will condense during compression: the compression heats up, the vapor remains vapor during all the compression

but it is also possible to compress in 2 steps: from almost 0bar to the pressure it takes for the vapor to condense at 20 ° C, a large condenser at room temperature, following the vacuum pump to go back up to 1 bar residual air with much less steam

[bernardd]

The pump, diaphragm or the like will release a mixture of liquid and a little steam.
If the liquid does not spontaneously come out of the wrongly oriented pump by flowing down, the pump will fill with water, will start to compress the liquid water, not very compressible and therefore knock hard and destroy itself !!!

Completely agree with the reasoning, and the risk to the pump seems to be taken into account by knf, although there is no detail. It is certainly part of the know-how, easier to hide than to patent ;-)

Otherwise, having recycled calcium chloride after absorption of water, it can be dried by heating (sun, stove, stove), but it must be shaken vigorously to break the dry and hard crust like a pebble, which forms on the surface, otherwise the very hard dry surface prevents drying of the liquid hidden underneath for days and days !!!

What if we put it in a vacuum enclosure?

ooopps sorry, this escaped me

I think it can also be sawdust behavior, certainly less pronounced. But having a mixing system in the enclosure could be useful.

To be honest, I wonder if we should not treat a very small amount of "sawdust" each time, by putting it directly into the diaphragm pump: the (essential) ratio between emptied volume and "pumped" volume would be then ideal and we would have a direct mixing effect (by vibration) or even pressing associated with vacuum.

[dedeleco]

To be honest, I wonder if we should not treat a very small amount of "sawdust" each time, by putting it directly into the diaphragm pump: the (essential) ratio between emptied volume and "pumped" volume would be then ideal and we would have a direct mixing effect (by vibration) or even pressing associated with vacuum.

The poor pump will not last long to pump the dry sawdust which will jam while refusing to go out unless the pump is special with a huge draft to get the sawdust out to the last chip !!
In addition, the diaphragm pump is two stages and therefore the sawdust will get stuck between the two stages and block the pump which will have to be dismantled entirely to loosen it !!!!
Not to mention an unfortunate grain of sand or small pebble lost in sawdust, which will destroy the pump, good to redeem!

for the vacuum pump, there is no hope that the water vapor will condense during compression: the compression heats up, the vapor remains vapor during all the compression

If the water vapor at the start is saturated, at the saturation pressure for example at 20 ° C of 23mbars, there is no need for compression, since it condenses at 23mbars, it will condense into liquid and come out a lot of liquid water with lots of clouds and steam.

Calcium chloride, even under vacuum, will form a surface crust which blocks evaporation, if it is not broken, by shaking violently.