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Over the last few decades, researchers have developed a number of empirical and theoretical models for the correlation and prediction of the thermophysical properties of pure fluids and mixtures treated as pseudo-pure fluids. In this paper, a survey of all the state-of-the-art formulations of thermophysical properties is presented. The most-accurate(More)
This paper presents an experimental characterization of an 11 kWe single screw expander modified from a standard compressor and integrated into an organic Rankine cycle (ORC) test facility using Solkatherm as working fluid. A total of 62 steady-state points are collected over a wide range of operating conditions to evaluate the expander and the system(More)
This work is focused on the thermodynamic optimization of Organic Rankine Cycles (ORCs), coupled with absorption or adsorption cooling units, for combined cooling heating and power (CCHP) generation from biomass combustion. Results were obtained by modelling with the main aim of providing optimization guidelines for the operating conditions of these types(More)
Comparison of moving boundary and finite-volume heat exchanger models in the Modelica language. Abstract: When modeling low capacity energy systems, such as a small size (5–150 kW el) organic Rankine cycle unit, the governing dynamics are mainly concentrated in the heat exchangers. As a consequence, the accuracy and simulation speed of the higher level(More)
This paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the performance over a wide range of operating conditions, by varying the supply pressure, the injection pressure, the discharge pressure, the supply superheating and the(More)
In this paper, the optimal operation of a stationary sub-critical 11 kW el organic Rankine cycle (ORC) unit for waste heat recovery (WHR) applications is investigated, both in terms of energy production and safety conditions. Simulation results of a validated dynamic model of the ORC power unit are used to derive a correlation for the evaporating(More)
Experimental data are subject to different sources of disturbance and errors, whose importance should be assessed. The level of noise, the presence of outliers or a measure of the " explainability " of the key variables with respect to the externally-imposed operating condition are important indicators, but are not straightforward to obtain, especially if(More)
Experimental investigation of a Scroll unit used as a compressor and as an expander in a Heat Pump/ORC reversible unit" (2014). ABSTRACT On one hand, the use of solar energy for heating and electricity production should increase in the future to reduce greenhouse emissions. On the other hand, the use of water to water heat pumps allows the production of(More)
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