For a rough guess try this. If you have a 10w 70c tec and you want to cool a chip that puts out 5 watts the tec will cool it about 35c. A 10w heat load would not get cooled at all. Thats the tradeoff, direct relationship between watts of heatload and how much it cools. It gets a lot more complex but for starters it will give you something to start from.
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