Work and power optimization of a finite-time Brayton cycle

SYNOPSIS This paper extends the author's previous work on the formulation of criteria for comparing the performance of real and ideal processes through the use of finite-time processes. The efficiency for the finite-time Carnot cycle at maximum power is derived. This is followed by an expression for the power output of the finite-time Brayton cycle. However, this is considered to be too complex to yield simple analytical solutions and a numerical solution is given. Finally the efficiency of a Carnot cycle, a finite-time Carnot cycle and a finite-time Brayton cycle are compared, showing that the latter cycle can provide a more suitable basis for real engine design.