Experimental and thermodynamic analysis of a bottoming Organic Rankine Cycle (ORC) of gasoline engine using swash-plate expander

Abstract

Phone: +34 963877650 Fax: +34 963877659 e-mail: vidolrui@mot.upv.es 1 all the parameters, changing each time one specific value. In these sensitivity studies, maximum ideal and real Rankine efficiency value of 19% and 6% were obtained respectively.

Modeling and Experimental Validation of a Volumetric Expander Suitable for Waste Heat Recovery from an Automotive Internal Combustion Engine Using an Organic Rankine Cycle with Ethanol

“…Howell et al [20] selected ethanol as the best working fluid for a successful ORC for a heavy duty (HD) truck. Despite these theoretical studies where ethanol has proven to be the most suitable working fluid for this type of installations, few experimental ORC works with this fluid have been published due to the flammability properties [21]. Therefore, it is necessary to take safety measures to prevent accidents arising from the use of this fluid.…”

“…The main elements have been carefully insulated to avoid heat losses to the ambient. The thermodynamic properties of ethanol (pressure and temperature) have been measured upstream and downstream of all components, verifying energy balances and power estimations to ensure the proper operation of all the elements [21]. Table 2 synthesizes the absolute uncertainties of all the sensors installed in the ORC mock-up.…”

“…Figure 9 shows the validation of Equation (9) between estimation and experimental values with a correlation coefficient (R 2 ) of 96%. Regarding mechanical losses, they were estimated using experimental values [21]. The following correlation was obtained, taking into account the expansion ratio and the expander speed:…”

“…The gasoline engine used in these tests is an inline four-cylinder turbocharged engine (Ford Ecoboost) with a volumetric capacity of 2 L. The engine steady-state operating point has remained constant with a value of 25 kW. The points presented in this study aim to show the recovery features at different expander operating points [21]. In these tests, the system has been controlled commanding three parameters: the speed of the pump, in order to control the mass flow of ethanol flowing through the installation, the balloon pressure of the expansion vessel, in order to control the outlet pressure of the expander, and the expander speed, in order to control the high pressure at the inlet of the expander.…”

Numerical characterization under uncertainties of a piston expander for exhaust heat recovery on heavy commercial vehicles

“…Some works [8] have been devoted to the design of an ORC facility for waste heat recovery in IC engines. Several studies [9,10,11,13,14,15] suggested the use of a piston expander for exhaust heat recovery (EHR). In [12], they tested an axial piston expander and calibrated a semi-empirical model.…”