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Performance evaluation in post integrated organic Rankine cycle systems: A study on operational systems utilizing low grade heat
Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Organic Rankine cycles can be integrated with district heating systems and in applications of biogas digestion. Evaluating the performance of the installations by Againity AB in Ronneby and Norrköping, Sweden, is a unique opportunity which can support the establishment of ORC technology in the waste heat recovery market, unveiling its feasibilities and limitations.

Operational data gathered from October 2017 until April 2018, provides this thesis with information about the ORC-systems. A method using Coolprop and Matlab has been used to detect steady-state series in the Ronneby installation using moving standard deviation and inclination criteria. By screening the data and selecting these series, analytical equations can be used to determine the performance of the installations and map the linear relationship between variables like pressure and generator power.

The largest impact on the system in Ronneby is developed in the condenser. Large coolant volume flow creates large heat sink capacity and higher generator efficiency and power. However, with increasing generator power the condenser pressure decrease. Lower condenser pressure results in a decreased evaporation pressure, which could be maintained if the pump was able to run at higher frequencies.

The Plant in Norrköping needs further studies and a review of its sensors. The code in Matlab is a resource to Againity and Linköpings university for future work in performance evaluation. It can be used to detect errors in energy balance, local readings, and picture the machines' performance graphically.

Place, publisher, year, edition, pages
2018. , p. 75
Keywords [en]
ORC, organic Rankine cycle, small scale, low grade heat, experimental, micro scale, CHP, combined heat and power, renewable energy, WHR, waste heat recovery, steady-state detection, cogeneration, performance evaluation, Coolprop
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:liu:diva-150371ISRN: LIU-IEI-TEK-A--18/03129—SEOAI: oai:DiVA.org:liu-150371DiVA, id: diva2:1240285
External cooperation
Againity AB
Subject / course
Applied Thermodynamics and Fluid Mechanics
Presentation
2018-06-13, 315:934, 13:15 (Swedish)
Supervisors
Examiners
Available from: 2018-08-22 Created: 2018-08-20 Last updated: 2018-08-22Bibliographically approved

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Faber Lindqvist 2018(6772 kB)277 downloads
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Citation style
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Output format
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