Constant Pressure Heat Rejection (3-1)
The final stage (3-1) involves a constant pressure heat rejection back to the original state. From the first law of thermodynamics we find: .
From the definition of work:, we recover the following for the heat rejected during this process: .
As a result, we can determine the heat rejected as follows: 
from the definition of constant pressure specific heats for an ideal gas: 
.
The overall efficiency of the cycle is determined by the total work over the heat input, which for a Lenoir cycle equals 
. Note that we gain work during the expansion process but lose some during the heat rejection process.
Read more about this topic: Lenoir Cycle
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