Finite time thermodynamic optimization of irreversible Rankine cycle heat pump system

Abstract

This paper presents finite time thermodynamic optimization of a Rankine cycle heat pump system affected by both, external and internal irreversibility. For a given input heat transfer rate in the boiler (heat source), work output of the heat engine is maximized and for a given heating load, work input to the heat pump cycle is minimized. The optimal bounds for the coefficient of performance (COP) and working fluid temperatures are determined, at a given heating load. The parametric study gives the variation of the coefficient of performance with operating variables (viz. inlet temperature of heat reservoirs, finite heat capacitance of external fluid, effectiveness of the heat exchangers and internal irreversibility parameters). Parametric study shows internal irreversibility is more responsible for performance reduction than external irreversibility