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Main Title: Experimental investigation of a cascaded organic Rankine cycle plant for the utilization of waste heat at high and low temperature levels
Author(s): Linnemann, Matthias
Priebe, Klaus-Peter
Heim, André
Wolff, Carsten
Vrabec, Jadran
Type: Article
Is Part Of: 10.14279/depositonce-9842
Language Code: en
Abstract: A power plant with two cascaded organic Rankine cycles (CORC) to exploit waste heat from a 800 kWe combined heat and power plant, fueled by biogas, is designed and tested. Heat from the exhaust gas is utilized with a high temperature organic Rankine cycle (HT-ORC), where toluene is employed as a working fluid. The heat discharged from the HT-ORC as well as heat from the engine coolant and additional heat from the exhaust gas is supplied to a low temperature ORC (LT-ORC) with the working fluid Solkatherm SES36. The design of the CORC and the selection of working fluids is presented, aiming at a maximum plant efficiency, but also complying with environmental, safety and practical issues. Furthermore, plant components and construction details are described. After manufacturing, initial tests are carried out, obtaining thermodynamic conditions that are close to the design of the HT-ORC, where a maximum electrical turbo-generator output of 17.5 kW is measured. The cascading of the low temperature heat sources and the transfer to the LT-ORC is shown as well as the basic operation of the LT-ORC. However, several problems occurred, such as a turbo-generator damage in the HT-ORC, a too high condensation pressure and a low working fluid mass flow rate in the LT-ORC, which are discussed together with proposed optimization measures.
Issue Date: 14-Jan-2020
Date Available: 27-Mar-2020
DDC Class: 660 Chemische Verfahrenstechnik
Subject(s): organic Rankine cycle
Cascaded ORC
dual loop ORC
waste heat recovery
Journal Title: Energy Conversion and Management
Publisher: Elsevier
Publisher Place: Amsterdam [u.a.]
Volume: 205
Article Number: 112381
Publisher DOI: 10.1016/j.enconman.2019.112381
EISSN: 1879-2227
ISSN: 0196-8904
Appears in Collections:FG Thermodynamik und Thermische Verfahrenstechnik » Publications

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