Thermodynamic Analysis of the Stirling Duplex Machine
The Stirling Duplex concept, in which a Stirling engine drives a Stirling heat pump, has many energy and environmental benefits. This machine is essentially composed of three movable elements, a working piston and two displacers, in the same enclosure. The machine has two circuits of non-polluting working fluid, in both parts, engine and refrigerator.The compatibility of the Stirling machine with any type of thermal energy as an external combustion engine contributes to its industrial interests and scientific research. In this paper, a study is presented to estimate Stirling Duplex$'$s parameters and efficiencies by considering the adiabatic model. It appears that the Stirling Duplex is more efficient as a heat pump than as a refrigerating machine.
A. G. Hèyihin et al., "Thermodynamic Analysis of the Stirling Duplex Machine", Advanced Engineering Forum, Vol. 30, pp. 80-91, 2018