Good morning. Despite my low post count on here I have some idea about computers, and have been looking into thermoelectrics for a while. Finally reached the point of running some numbers for a potential project, and discovered data sheets to be difficult to source, and the tecs themselves only seem to be available in the UK through ebay.
Tecs draw a certain current, which I believe to be temperature dependent. The power consumed is related to the heat transferred, it seems at low voltages the heat wattage transferred can be higher than the electrical power consumed, whereas at high voltage the opposite is true. So multiple tecs undervolted are the way to go.
Geometrical constraints suggest at most half a dozen 50x50x3.6mm tecs, ebay offers the 12726. Does anyone happen to have a link kicking around for the datasheet on this? I have found the undervolting chart in the sticky, but would like to know more.
The intention is to run them at 6V, where the table suggests a current draw of 9.5A and a power of 35W. 9.5A drawn at 6V is 57W by my reasoning, so what does the 35W refer to? Hence the request for data sheets and a push in the direction for calculations. I'm aware that using an atx psu is frowned upon, however were I to use a reliable one with 57A spare on the 12V rail I fail to see the issue.
To clarify. I am interested in calculating heat transfer across the peltier as a function of voltage, current and temperature either side. I am also interested in calculating what additional heat must be disposed of if it is not equal to IV. I'm failing to find this in the literature, I suspect because I'm looking in the wrong place.
Intended use is as a heat exchanger. Cold loop with various components in, hot loop with radiator. The current objective is above dew point cold loop temperatures (I believe this can be achieved by varying the voltage across the tecs downwards from 6V and/or turning off pairs when idle) using a smaller radiator than is required to cool the components normally. To determine whether this is viable for six, four or even two tecs I need some means of calculating the maximum heat they can move. The hope is by running the hot loop at 60 centigrade or so, radiator efficiency will be improved and counteract the additional heat dump.
On a not unrelated note, I'm also curious as to which of a ddc, feser radiator and tygon will fail first as temperatures increase, and what sort of limit I'm looking at for 24/7 use. 60 C is the estimate I'm currently working with.
Cheers
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