Application of ORC power station to increase electric power of gas compression ignition engine

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie, Katedra Techniki Cieplnej al. Piastów 17, 70-310 Szczecin, Polska

^* Corresponding author: aborsukiewicz@zut.edu.pl

Abstract

The paper presents the calculation results of efficiency of the subcritical low temperature ORC power station powered by waste heat resulting from the process of cooling a stationary compression ignition engine. The source of heat to supply the ORC power station is the heat in a form of water jet cooling the engine at a temperature of 92°C, and the exhaust gas stream at a temperature of 420°C. The study considers three variants of systems with the ORC power stations with different ways of using heat source. The first variant assumes using just engine cooling water to power the ORC station. In the second variant the ORC system is powered solely by a heat flux from the combustion gases by means of an intermediary medium - thermal oil, while the third variant provides the simultaneous management of both heat fluxes to heat the water stream as a source of power supply to the ORC station. The calculations were made for the eight working media belonging both to groups of so-called dry media (R218, R1234yf, R227ea) and wet media (R32, R161, R152a, R134a, R22).