[foodhackingbase] update on the experimental incubator testing

[Sven Uckermann]

Hi,
the problem with cooling and heating is that the stuff inside (aka your
cultures etc) are often water based and as such an great material for
taking heat .. but the air as such is a good insulator so getting rid of
the heat of the peltier while cooling seems to be your problem ... you
might want to add some thermal mass (copper or such) to the "outside" of
your peltier .. so it can cool more .. if both sides of the peltier are the
same temperature this things dosn't work to great.
Greetings Sven

2014-06-07 15:06 GMT+02:00 Frantisek Algoldor Apfelbeck <
algoldor at foodhackingbase.org>:

> Hi to all,
> I've uploaded graphs of the latest Marcel's and my testing of the
> experimental incubator:
>
> https://foodhackingbase.org/wiki/Experimental_Incubator/2.1_mamut_tamna
>
> I will play with them more later on at the moment proper legends are
> missing and the scales of all graphs are not same which may make
> understanding of what is the performance bit hard. Also I need to add
> detailed description of the hardware like volume of the chambers, power of
> the pelties etc.
>
> Especially Marcel's experiment shows the fine heating potential hitting
> over 70C, still the cooling is not doing too well. My heating results are
> satisfactory hitting around 50C for culturing many fermented products which
> I and we here are into, cooling is definitely not. I still do not know how
> to switch polarity of the peltier so the cooling/heating would be done
> automatically by program. I need to buy good h-bridge (ideas?) or make one
> or use some set of relays (how to do that?). I'm looking forward for
> comments!
>
> I wonder if Lars could think about what may be the issue with the cooling
> because the Warpzone prototype is doing much better, going down to around
> 8C at over 25C outer temperature, right?
>
> Many thanks for any info, I will be working on this in the next few days,
> I just cut my hand so no field work for a while and soon I will be able to
> type again properly :-)
>
> Sincerely,
>
> --
> Frantisek Algoldor Apfelbeck
>
> biotechnologist&kvasir and hacker
>
> http://www.frantisekapfelbeck.org
>
> "There is no way to peace, peace is the way." Mohandas Karamchand Gandhi
>
>
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