Recirculator with double flow for dryer

[elephant]

New house, new ideas.

I have just moved into a new house (which does not mean a new house) where there is no shortage of savings possibilities: I collect insulation for free to insulate the 2nd floor, I use water rain (tank 3 X 3 X 1,7 m), etc ...

I am also in the process of concocting a little "report" on the improvements I (or I will) make inexpensively on this house: a little patience: you must first establish the figures.

One idea that comes to my mind is as follows: do you have any ideas for tinkering with a double flow ventilation for the dryer?
Of course, the purists will tell me: "forget the dryer!", But you know women: they always have a good reason for wanting to go fast: speed, smells, not practical, etc .... Finally, the cellar will stop stinking of fuel oil: we change the boiler Tuesday 16/8 to switch to natural gas.

The idea is therefore to make a "double flow", preferably with recycled materials to reinject hot, but dry air into the veranda which houses the washing machine and dryer. Because, it is of course excluded to re-inject humid air.

I'm thinking of one or two rack fans for the back flow.
Will I get the air outside (very cold in winter) or in the cellar? (much hotter because of central heating, but is that not likely to increase the losses of said heating?

The question is above all: how would you make the exchanger while spending the least possible? The air temperature is relatively modest: maybe 30 °, because as my wife says: "Weird: since we invented the dryer, we have invented clothes that do not support it". So the machine is still on "S" (soft).
The fact remains that the dryer is the most demanding appliance in the house: 3 to 5 KWh for the 2-hour session.
The washing machine is especially greedy in water, but I think that a filter of 50 euros on the hydrophore group will arrange that.

(did you know that the m³ of H20 with us costs 3,89 € - including 1,54 € / m³ of purification costs -)

Impatient to hear your suggestions, cordial greetings to all.

[dedeleco]

A simple condenser exchanger is made on;
https://www.econologie.com/forums/post184418.html#184418
https://www.econologie.com/forums/post176575.html#176575
https://www.econologie.com/forums/post184274.html#184274
see the different interventions before and after especially by mich

The condensation of evaporated water which is inevitable and essential for recovering the heat of evaporation means that everything must be water resistant and not easily clogged, while the space between plates is a few mm with a thermal flux in the range of one or more tens of W / m2 ° C at best in laminar and even turbulent flow because the limit air layer which fixes the heat flow is a few mm, as for single or double glazing.
Also for the KW and a few degrees of heat loss this requires almost 100m2 !!
surface which will be leached out by the condensation water to drain off well.

These constraints make the price quickly high well above the price of the dryer !!

You can see how inexpensive energy is, good to waste !!

€ 0,5 per drying for how much per year ???? 26 to 60 € per year ???????
and what investment in double flow ???????

[elephant]

Thank you for your analysis.

As I evolve my thinking, I wonder if I would not replace the flexible reinforced plastic tube with an aluminum tube of the same kind, on which I would place fins. (or put a very long tube that I would snake?)

There is no problem to make a slope to evacuate the condensed water.

Raising the temperature of the veranda would improve the performance of my kitchen next door anyway.