Investigation on ejector design for CO₂ heat pump applications using Dymola

封面


如何引用文章

全文:

开放存取 开放存取
受限制的访问 ##reader.subscriptionAccessGranted##
受限制的访问 订阅或者付费存取

详细

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.

全文:

受限制的访问

作者简介

Antoine Metsue

Institute Mechanics, Materials, and Civil Engineering (iMMC), Université catholique de Louvain (UCLouvain)

编辑信件的主要联系方式.
Email: antoine.metsue@usherbrooke.ca
比利时, Louvain-la-Neuve

Yann Bartosiewicz

Institute Mechanics, Materials, and Civil Engineering (iMMC), Université catholique de Louvain (UCLouvain)

Email: yann.bartosiewicz@uclouvain.be
比利时, Louvain-la-Neuve

Sébastien Poncet

Mechanical Engineering Department, Université de Sherbrooke

Email: sebastien.poncet@usherbrooke.ca
加拿大, boulevard de l’Université, 2500, Sherbrooke

参考

  1. Liu J, Wang L, Jia L, Xue H. Thermodynamic analysis of the steam ejector for desalination applications. Appl. Therm. Eng. 2019;159(1):113883.
  2. Ipakchi O, Mosaffa AH, Garousi Farshi L. Ejector based CO₂ transcritical combined cooling and power system utilizing waste heat recovery: A thermoeconomic assessment. Energy Convers. Manag. 2019;186(1):462–472.
  3. Besagni G, Mereu R, Inzoli F. Ejector refrigeration: A comprehensive review. Renew. Sustain. Energy Rev. 2016;53(1):373–407.
  4. Aidoun Z, Ameur K, Falsafioon M, Badache M. Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors. Inventions. 2019;4(1):15.
  5. Aidoun Z, Ameur K, Falsafioon M, Badache M. Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors. Inventions. 2019;4(1):16.
  6. Tashtoush BM, Al-Nimr MA, Khasawneh MA. A comprehensive review of ejector design, performance, and applications. Appl. Energy. 2019;240(1):138–172.
  7. Elbel S, Hrnjak P. Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation. Int. J. Refrig. 2008;31(3):411–422.
  8. Taslimi Taleghani S, Sorin M, Poncet S. Modeling of two-phase transcritical CO₂ ejectors for on-design and off-design conditions. Int. J. Refrig. 2018;87(1):91–105.
  9. Metsue A, Debroeyer R, Poncet S, Bartosiewicz Y. An improved thermodynamic model for supersonic real-gas ejectors using the compound-choking theory. Energy. 2021. (In Print).
  10. Chen Y, Chen Z, Chen Z, Yuan X. Dynamic modeling of solarassisted ground source heat pump using Modelica. Appl. Therm. Eng. 2021;196(1):117324.
  11. Liu F, Qiu W, Deng J, et al. Multi-objective nonsimultaneous dynamic optimal control for an ejector expansion heat pump with thermal storages. Appl. Therm. Eng. 2020;168(1):114835.
  12. Hafner A, Försterling S, Banasiak K. Multi-ejector concept for R-744 supermarket refrigeration. Int. J. Refrig. 2014;43(1):1–13.
  13. Liu F, Deng J, Pan W. Model-based Dynamic Optimal Control of an Ejector Expansion CO₂ Heat Pump Coupled with Thermal Storages. Energy Procedia. 2018;152(1):156–161.
  14. Zhu Y, Li C, Zhang F, Jiang P-X. Comprehensive experimental study on a transcritical CO₂ ejector-expansion refrigeration system. Energy Convers. Manag. 2017;151(1):98–106.

补充文件

附件文件
动作
1. JATS XML
下载
2. Fig. 1. Comparison of the two ejectors models in TIL with the present model. Left: pp,0 = 95 bar; Right: pp,0 = 85 bar.

下载 (154KB)
索引源数据
3. Fig. 2. Schematic of the ejector model of Metsue et al. [9].

下载 (105KB)
索引源数据
4. Fig. 3. Fitting of the model onto the experimental data of Zhu et al. [14]. Blue: pp,0 = 8.7 bar; Red: pp,0 = 9.3 bar; Black: pp,0 = 9.8 bar.

下载 (64KB)
索引源数据
5. Fig. 4. Schematic of the heat pump cycle.

下载 (99KB)
索引源数据
6. Fig. 5. Ejector operating conditions and COP of the cycle as a function of the ejector size. The dashed line delimits on- and off-design regimes.

下载 (246KB)
索引源数据

版权所有 © Eco-Vector, 2023

Creative Commons License
此作品已接受知识共享署名-非商业性使用-禁止演绎 4.0国际许可协议的许可。