Figure 5.14 Pumped cold power and coefficient of performance as a function of current for the thermocouple of the example. Observe that the current that maximizes the pumped power is not the same as the one that maximizes the coefficient of performance.
Im max cooling aTc R
The cold power pumped when this current is used is
In our example, the current that maximizes the pumping is 3.64 A, and the maximum power pumped is 12.83 W.
The lowest temperature that can be reached is that at which heat just ceases to be pumped—that is, PC = 0:
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The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.