Abstract
This paper describes the model of the novel concept liquid piston engine, which is designed to convert low-grade waste heat into electricity. The proposed dynamic oriented model is implemented in Aspen Hysys that enables simulations dynamic simulation of various working agents. The simulation results were verified with experimental data obtained from the research installation. The proposed model demonstrated relatively small discrepancies with respect to experimental research, hence it could be used as a tool for research on optimization of an innovative power plant operation, i.e. various working agents, various operating pressures.
Highlights
Energy becomes more and more expensive what drives a research on new innovative power systems e.g system based on fuel cells [1], electrolysis combined with turbines [2, 3], compressed air energy storage [4,5] etc)
The working principle of novel concept liquid piston engine is guided by opening and closing valves that are used to control the process of oil and liquid motion
The basic thermodynamic assumption for modeling a working agents behavior is the proper selection of the gas model
Summary
Energy becomes more and more expensive what drives a research on new innovative power systems e.g system based on fuel cells [1], electrolysis combined with turbines [2, 3], compressed air energy storage [4,5] etc). One of the promising sources of power is an utilization of low-grade waste heat, which is being released into the environment. The promising concept for waste recovery seems to be an liquid piston engine, which is recognized as a type of Stirling engine [6]. The concept of liquid piston engine was firstly reported in the available literature in 1971 and denoted as Fluidyne engine [7]. We proposed the novel concept of fluid piston engine called “TURMES” [11], where the vapor of low-boiling fluids expands inside the tank and forces a flow of liquid to ensure a continuous liquid flow through the expander – see Fig 1. The prelimary study [12,13,14] revealed that the most suitable pair of working agents with respect to operating conditions are vapor of R-245fa and oil: Ergolid A – selected parameters of working agents are displayed in table 1
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