Originally Posted by ChandlerBang
Very nice. What is the maximum theoretical BTU/hr rating on that?
Thank you for the compliment
I term of performance I have not calculated a sophisticated thermodynamic model
my approach was more empirc based on what Im able to source on the surplus market at a reasonable price. Nevertheless some figures are available and Im pleased to share..maybe you can help me in a math model.
Im not familiar with US/GB unit measurement so everything is expressed in wat, Celsius etc..
The core of the unit are 6 peltier cells that are rated 72W maximum power..this is the absorption
I discovered that are under powered in order to work in a safer condition. Some PC modding project overpowered the cells or substituted with more powerful one.
According to this graph the unit is capable to dissipate around 120W with 0 delta to ambient temperature
so assuming that 30L of fermenting wort produce 100W heat you can cool at room temperature
If you want to go below room temperature you can dissipate 50W with 10C delta..
From my experimental test I was able to cool the fluid with no load (empty fermenter) up to 10-11 Celsius with 22C ambient.
One point that Im still investigating is that the minimum power unit that you can configure via control software is 40%...even if the temp reach the set point the control unit still apply a minimum power of 40%...that is not so low..infact with water experiment I had a temperature slowing decreasing. In case of fermentation Im still verifying if the heat produced by the fermentation compensate the 40% minimum power
Im also investigating with the manufacturer if I can configure the minimum = 0
Last graph is related to thermal resistance according to power @100W its 0.1W/C that if I understand the number is quite low compared other cooling system (air-air)
Hope this data are useful..maybe we can start a more analytic thread for dimensioning peltier cells in such an application