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Witold Rybiński and Jarosław Mikielewicz

Abstract

Organic Rankine cycle (ORC) is used, amongst the others, in geothermal facilities, in waste heat recovery or in domestic combined heat and power (CHP) generation. The paper presents optimization of an idealized ORC equivalent of the Carnot cycle with non-zero temperature difference in heat exchangers and with energy dissipation caused by the viscous fluid flow. In this analysis the amount of heat outgoing from the ORC is given. Such a case corresponds to the application of an ORC in domestic CHP. This assumption is different from the most of ORC models where the incoming amount of heat is given.

Open access

Katarzyna Bizon

Abstract

Over the last decades the method of proper orthogonal decomposition (POD) has been successfully employed for reduced order modelling (ROM) in many applications, including distributed parameter models of chemical reactors. Nevertheless, there are still a number of issues that need further investigation. Among them, the policy of the collection of representative ensemble of experimental or simulation data, being a starting and perhaps most crucial point of the POD-based model reduction procedure. This paper summarises the theoretical background of the POD method and briefly discusses the sampling issue. Next, the reduction procedure is applied to an idealised model of circulating fluidised bed combustor (CFBC). Results obtained confirm that a proper choice of the sampling strategy is essential for the modes convergence however, even low number of observations can be sufficient for the determination of the faithful dynamical ROM.

Open access

Radosław Musoski and Jacek Stelmach

-Lagrange framework. Chem. Eng. Sci., 108, 9-22. DOI: 10.1016/j.ces.2013.12.034. Lindken R., Merzkirch W., 2002. A novel PIV technique for measurements in multiphase flows and its application to two-phase bubbly flows. Exp. Fluids , 33, 814-825. DOI: 10.1007/S00348-002-0500-1. Linek V., Kordač M., Fujasová M., Moucha T., 2004. Gas-liquid mass transfer coefficient in stirred tanks interpreted through models of idealized eddy structure of turbulence in the bubbly vicinity. Chem. Eng. Process. Process Intensif. , 43, 1511-1517. DOI: 10.1016/j.cep.2004

Open access

Janusz A. Szpaczyński, Jeffrey A. White and Caroline L. Côté

. Drying Technol., 20, 1019-1033. DOI: 10.1081/DRT-120003775. Christon M., Burns P.J., Sommerfeld R.A., 1994. Quasi-steady temperature gradient metamorphism in idealized, dry snow. Numer. Heat Transfer, Part A, 25, 259-278. DOI: 10.1080/10407789408955948. Cisse J., Bolling G.F., 1971. A study of the trapping and rejection of insoluble particles during the freezing of water. J. Cryst. Growth, 10, 67-76. DOI: 10.1016/0022-0248(71)90047-9. Colbeck S.C., 1980. Thermodynamics of snow metamorphism due to variations in curvature