View source for Experimental Incubator/2.1 mamut tamna

On this page you can find more info abot the experimental incubator 2.1 Mamut-Tamna prototype, where [http://en.wikipedia.org/wiki/Tamna Tamna] suggests locality where it was build and tested.  

This prototype was build based on the blueprints of the [[Experimental_Incubator/2.1_mamut|2.1 mamut]], with significant help of the Food Hacking Base group who's help was truly appreciated.

==== Desired features, goals of the prototype ====


This prototype was aiming to function in a same manner as 2.1 mamut measuring therefore the temperature within the incubator chamber, displaying it on the LCD display, allowing for heating and cooling functions set by button interface running software shared in our [https://github.com/foodhackingbase/incubator Github repository]. The power was sourced from a standard [http://en.wikipedia.org/wiki/Power_supply_unit_%28computer%29 computer PSU] offering therefore 5 VDC and 12 VDC. For heating the [http://en.wikipedia.org/wiki/Thermoelectric_cooling peltier element] was used, power estimated to 60 W. The distribution of the heat was carried out by two aluminium [http://en.wikipedia.org/wiki/Heat_sink heat sinks] and [http://en.wikipedia.org/wiki/Thermal_grease thermal paste] which were cooled by standard PCU fans, each mounted on the top of the heat sink. The peltier and fans were controlled by Arduino through a circuit composing of [http://en.wikipedia.org/wiki/Darlington_transistor darlington transistor] multiplying the signal from the Arduino digital pin to switch on/off the [http://en.wikipedia.org/wiki/Relay mechanical relay] providing the power for the fans and peltier (two separated outputs).


The first temporary testing prototype was using a polystyrene box as a chamber, size: a=76cm, b=46 cm and c=46 cm; V= 0.160 816 m3, front of the box covered by think polystyrene insulation and cardboard paper. The heating and cooling unit were attached on the top of the box (in the hole cut and sealed in the polystyrene). 


'''Performance:'''

At approximately 20-21°C external temperature, heating the chamber for two hours resulted in 14.25°C increase of temperature from 18.56°C to 32.81°C (12.06°C temperature increase after first hour). Cooling at similar external temperature resulted in 3.62°C temperature decrease after 2 hours, cooling the chamber from 20.93°C to 17.25°C (3°C after temperature decrease after first hour).

I've shared a link to the [https://docs.google.com/spreadsheets/d/1ClfEz5o31mprQe8M2yDQ_czyGrzlnibrQInlXdKTEZ0/edit?usp=sharing Google spreadsheet] so you can have a look on the values and graphs, I will upload some nice graphs eventually but I'm having a major issue with experting it from Libre Office 3.6.?? to jpg or whatever ...

'''Heating Experiment''' 14/4/2014
{| class="wikitable sortable"
! Time (min) !! Internal temperature (t) (°C) !! External t (°C) !! Difference of internal t (°C) !! Sum of t difference (°C) 
|-
|0||18.56||20.10||0.00||0
|-
|10||23.10||20.00||4.54||4.54
|-
|20||25.87||20.10||2.77||7.31 
|-
|30||27.56||20.30||1.69||9.00
|-
|40||28.75||20.40||1.19||10.19
|-
|50||29.81||20.60||1.06||11.25
|-
|60||30.62||20.70||0.81||12.06
|-
|70||31.25||20.80||0.63||12.69
|-
|80||31.75||20.90||0.50||13.19
|-
|90||32.12||21.00||0.37||13.56
|-
|100||32.37||21.00||0.25||13.81
|-
|110||32.68||21.10||0.31||14.12
|-
|120||32.81||21.10||0.13||14.25
|-
|130||33.00||21.10||0.19||14.44
|}


'''Cooling Experiment''' 17/4/2014
{| class="wikitable sortable"
! Time (min) !! Internal temperature (t) (°C) !! External t (°C) !! Difference of internal t (°C) !! Sum of t difference (°C) 
|-
|0||20.93||21.9||0||0
|-
|10||19.68||22.4||1.25||1.25
|-
|20||19.06||22.4||0.62||1.87
|-
|30||18.62||22.4||0.44||2.31
|-
|40||18.31||22.4||0.31||2.62
|-
|50||18.12||22.3||0.19||2.81
|-
|60||17.93||22.3||0.19||3
|-
|70||17.81||22.2||0.12||3.12
|-
|80||17.62||22.1||0.19||3.31
|-
|90||17.56||22.1||0.06||3.37
|-
|100||17.5||22.1||0.06||3.43
|-
|110||17.37||21.9||0.13||3.56
|-
|120||17.31||21.9||0.06||3.62
|-
|130||17.25||21.8||0.06||3.68
|}