Mahdi Hatf Kadhum Aboaltabooq1, Tudor Prisecaru, Horatiu Pop, Valentin Apostol, Viorel Badescu, Malina Prisecaru, Elena POP, MIHAELA - Cristina Ciobanu, Madalina Ghilvacs, Gheorghe Popescu, Cristian Petcu, Ana-Maria Alexandru <br>Unsteady State Modeling of an Organic Rankine Cycle for Waste <br>Heat Recovery from Internal Combustion Engine

Mahdi Hatf Kadhum Aboaltabooq1, Tudor Prisecaru, Horatiu Pop, Valentin Apostol, Viorel Badescu, Malina Prisecaru, Elena POP, MIHAELA - Cristina Ciobanu, Madalina Ghilvacs, Gheorghe Popescu, Cristian Petcu, Ana-Maria Alexandru
Unsteady State Modeling of an Organic Rankine Cycle for Waste
Heat Recovery from Internal Combustion Engine

Abstract:

This paper describes the behavior of an ORC used to recover energy from a variable flow rate and temperature waste heat source from a diesel engine. A steady state model is unable to predict transient behavior in a cycle with a varying thermal source. A Transient model of the ORC is therefore proposed focusing specifically on the time-varying performance of the heat exchangers, the dynamics of the other components being of minor importance. A mathematical model was developed with regard to the preheater, boiler and the superheater zones of a counter flow evaporator. Each of these zones has been subdivided into a number of the cells. ORC unit under investigation uses R245fa as the working fluid. The results show that when heat source decreases the area of zones in heat exchanger are shifted from place to another place. In our case the area of superheater and preheater zones in evaporator is decrease with time, but the boiler zone is increased. In addition, the area of desuperheater in condenser is decrease with time, but the condenser zone is increased. In another words, when the heat source decreases in the evaporator with time, and the mass flow rate of refrigerant is constant that is lead to disappear the superheater zone in evaporator and shift to the boiler zone. Keywords: waste heat recovery, organic Rankine cycle, transient condition model

Issue: 2015, Volume 66, Issue 9

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This article is published under the Creative Commons Attribution 4.0 International License

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