Investigation on ejector design for CO₂ heat pump applications using Dymola
- Authors: Metsue A.1, Bartosiewicz Y.1, Poncet S.2
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Affiliations:
- Institute Mechanics, Materials, and Civil Engineering (iMMC), Université catholique de Louvain (UCLouvain)
- Mechanical Engineering Department, Université de Sherbrooke
- Issue: Vol 112, No 4 (2023)
- Pages: 227-236
- Section: Original Study Articles
- URL: https://journals.rcsi.science/0023-124X/article/view/267763
- DOI: https://doi.org/10.17816/RF635384
- ID: 267763
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Abstract
In this paper, the Dymola modelling tool is used to study the influence of ejector design onto the whole heat pump cycle working with carbon dioxide. The cycle is built using the components provided by the TIL Modelica library. It is found that the ejector models in TIL are quite limited, namely by their inability to properly capture the on-design plateau and rapid decrease in performance in off-design operation. Therefore, an in-house state-of-the-art ejector model, originally developed in Python, is implemented as a Dymola object. This model is then calibrated onto CO₂ experimental data. The operation of a simple CO₂ heat pump system is investigated, with focus on the ejector sizing at fixed geometry. It is found that there exists an ejector size that maximises the COP of the cycle. Furthermore, critical ejector pressure is not reached at this optimum COP point; the ejector is operating well under the on-design regime.
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##article.viewOnOriginalSite##About the authors
Antoine Metsue
Institute Mechanics, Materials, and Civil Engineering (iMMC), Université catholique de Louvain (UCLouvain)
Author for correspondence.
Email: antoine.metsue@usherbrooke.ca
Belgium, Louvain-la-Neuve
Yann Bartosiewicz
Institute Mechanics, Materials, and Civil Engineering (iMMC), Université catholique de Louvain (UCLouvain)
Email: yann.bartosiewicz@uclouvain.be
Belgium, Louvain-la-Neuve
Sébastien Poncet
Mechanical Engineering Department, Université de Sherbrooke
Email: sebastien.poncet@usherbrooke.ca
Canada, boulevard de l’Université, 2500, Sherbrooke
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