A carnot engine operates between two heat reservoirs at temperatures th and tc. an inventor proposes to increase the efficiency by running one engine between th and an intermediate temperature t and a second engine between t and tc using as input the heat expelled by the first engine.

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Physics

24 September, 20:02

A carnot engine operates between two heat reservoirs at temperatures th and tc. an inventor proposes to increase the efficiency by running one engine between th and an intermediate temperature t and a second engine between t and tc using as input the heat expelled by the first engine.

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Sanaa · Answer 1

The efficiency of the first Carnot engine is

n1 = 1 - Th/T

The efficiency of the second Carnot engine is

n2 = 1 - T/Tc

The total efficiency of the engines put in series is

n = 1 - Th/Tc