Abstract
An upper bound is established for the rate of entropy increase due to noise power flow in a nonisothermal linear network containing n independent noise sources. The bound depends on the net power flows to (or from) the noise sources collectively, the lowest noise temperature in the network, and the efficiency of a Carnot heat engine operating between the highest and the lowest noise temperature occurring in a system. The author's example demonstrates that for a two port, the upper bound is actually reached and therefore a tighter bound cannot be found in general. Based on this example, a previously published bound is interpreted as the statement that the rate of entropy increase in the given n-port system cannot exceed that in a two port, in which the terminations are at the maximum and the minimum temperatures and the power flow equal the net value.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Published Version
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