Abstract
The preliminary design of a test-rig for non-ideal compressible-fluid flows of carbon dioxide is presented. The test-rig is conceived to investigate supersonic flows that are relevant to the study of non-ideal compressible-fluid flows in the close proximity of the critical point and of the liquid-vapor saturation curve, to the investigation of drop nucleation in compressors operating with supercritical carbon dioxide and and to the study of flow conditions similar to those encountered in turbines for Organic Rankine Cycle applications. Three different configurations are presented and examined: a batch-operating test-rig, a closed-loop Brayton cycle and a closed-loop Rankine cycle. The latter is preferred for its versatility and for economic reasons. A preliminary design of the main components is reported, including the heat exchangers, the chiller, the pumps and the test section.
Highlights
Supercritical carbon dioxide is currently being considered as working fluid in several industrial and power generation applications thanks to its relatively low critical pressure and its low critical temperature
Expansions B, C and D lies in the thermodynamic region where Γ > 1 and the Mach number is monotonically increasing to supersonic values, to what observed in the ideal flows of dilute gases
Despite the wide use of sCO2 in energy and chemical industry, the knowledge about carbon dioxide behavior in the supercritical region and near the critical point is still deficient, both in terms of fundamentals and of experimental data required for validation
Summary
Supercritical carbon dioxide (sCO2) is currently being considered as working fluid in several industrial and power generation applications thanks to its relatively low critical pressure and its low critical temperature. The dynamics of compressible fluids in the close proximity of the vapor-liquid saturation curve and critical point or within the supercritical region are referred to in the following as Non-Ideal Compressible-Fluid Dynamics (NICFD). Fundamental studies of supersonic sCO2 flows will be carried out in the close proximity of the critical point and the liquidvapor saturation curve, where sCO2 compressors for power production are designed to operate.
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