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Transient analysis and control of a Brayton heat pump during start-up

Pettinari, Matteo and Frate, Guido Francesco and Tran, A. Phong and Oehler, Johannes and Stathopoulos, Panagiotis and Ferrari, Lorenzo (2023) Transient analysis and control of a Brayton heat pump during start-up. In: 36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2023, pp. 839-850. 36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2023), Las Palmas de Gran Canaria, Spanien. doi: 10.52202/069564-0076. ISBN 978-171387492-8.

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Abstract

This paper aims to investigate the transient response of the DLR's CoBra prototype, an innovative Brayton-cycle heat pump intended to provide heat above 250 °C and currently under commissioning at the DLR facility in Cottbus, Germany. First, a comprehensive transient thermodynamic model of the system is developed, accounting for heat exchangers and piping thermal inertia. Furthermore, a control logic is presented that ensures safe operation throughout off-design conditions and start-up manoeuvres. In particular, several control parameters are considered to avoid potential operational issues, such as critical temperature gradients, compressor surge, and critical mechanical vibration phenomena due to resonance. The performed simulations aim to reduce start-up time and energy consumed during start-up. Results show that with the help of the described controller, the system can reach design operation via a transient trajectory safely and quickly. Therefore, the capability of the CoBra prototype to flexibly supply high-temperature heat is demonstrated.

Item URL in elib:https://elib.dlr.de/197425/
Document Type:Conference or Workshop Item (Speech)
Title:Transient analysis and control of a Brayton heat pump during start-up
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Pettinari, MatteoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Frate, Guido FrancescoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tran, A. PhongUNSPECIFIEDhttps://orcid.org/0000-0002-3365-5500UNSPECIFIED
Oehler, JohannesUNSPECIFIEDhttps://orcid.org/0000-0001-6226-5328UNSPECIFIED
Stathopoulos, PanagiotisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ferrari, LorenzoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:2023
Journal or Publication Title:36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2023
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.52202/069564-0076
Page Range:pp. 839-850
ISBN:978-171387492-8
Status:Published
Keywords:High-Temperature Heat Pump, Process Heat, Reverse Brayton Cycle, Transient Modelling, Closed Cycle Control
Event Title:36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2023)
Event Location:Las Palmas de Gran Canaria, Spanien
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Low-Carbon Industrial Processes
Location: Cottbus
Institutes and Institutions:Institute of Low-Carbon Industrial Processes
Institute of Low-Carbon Industrial Processes > High-Temperature Heat Pumps
Institute of Low-Carbon Industrial Processes > Simulation and Virtual Design
Deposited By: Tran, A. Phong
Deposited On:23 Nov 2023 11:17
Last Modified:30 Nov 2023 08:12

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