Transcritical R744 refrigeration systems for supermarket applications: Current status and future perspectives

P Gullo, A Hafner, K Banasiak - International Journal of Refrigeration, 2018 - Elsevier
Visible signs of climate change call for urgent actions on food retail industry, since such a
sector is characterized by an abundant carbon footprint. Being CO 2 (or R744) recognized …

Progress in ejector-expansion vapor compression refrigeration and heat pump systems

Z Zhang, X Feng, D Tian, J Yang, L Chang - Energy conversion and …, 2020 - Elsevier
The use of an expansion energy recovery ejector has been given great concern owing to
virtues of no moving elements, cost-effectiveness, high reliability and comparable efficiency …

[HTML][HTML] A detailed review on CO2 two-phase ejector flow modeling

KE Ringstad, Y Allouche, P Gullo, Å Ervik… - Thermal Science and …, 2020 - Elsevier
Ejector-equipped vapor-compression systems for refrigeration and cooling, relying solely on
CO 2 (R744) as a natural working fluid, are perceived to be an eco-friendly and highly …

An experimental study of an ejector-boosted transcritical R744 refrigeration system including an exergy analysis

AFA Elbarghthi, A Hafner, K Banasiak… - Energy Conversion and …, 2021 - Elsevier
The field of refrigeration witness a massive transition in the supermarket with a strong focus
reflected on energy consumption. The use of ejector allows for overcoming the significant …

Comprehensive experimental study on a transcritical CO2 ejector-expansion refrigeration system

Y Zhu, C Li, F Zhang, PX Jiang - Energy Conversion and Management, 2017 - Elsevier
A comprehensive experimental study on the ejector and cooling performances of a
transcritical CO 2 ejector-expansion system is presented. The ejector performance of the …

Experimental investigation on the performance of transcritical CO2 ejector–expansion heat pump water heater system

Y Zhu, Y Huang, C Li, F Zhang, PX Jiang - Energy conversion and …, 2018 - Elsevier
The effects of hot-water outlet temperature, compressor discharge pressure, compressor
rotation speed, and expansion valve opening on the ejector and overall system performance …

Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

RU Rony, H Yang, S Krishnan, J Song - Energies, 2019 - mdpi.com
Heat pump (HP) is one of the most energy efficient tools for address heating and possibly
cooling needs in buildings. Growing environmental concerns over conventional HP …

Performance improvement of CO2 two-phase ejector by combining CFD modeling, artificial neural network and genetic algorithm

G Liu, H Zhao, J Deng, L Wang, H Zhang - International Journal of …, 2023 - Elsevier
The ejector, as one of the core components of the CO 2 trans-critical ejection refrigeration
system, plays an important role in improving refrigeration capacity and reducing compressor …

Multi-ejector R744 booster refrigerating plant and air conditioning system integration–A theoretical evaluation of energy benefits for supermarket applications

P Gullo, A Hafner, G Cortella - international journal of refrigeration, 2017 - Elsevier
The multi-ejector rack is the most promising technology to push the so-called “CO 2 equator”
further south and improve the global energy efficiency of R744 supermarket refrigeration …

Investigation on key geometries optimization and effect of variable operating conditions of a transcritical R744 two-phase ejector

J Yan, Z Li, H Zhang - Applied Thermal Engineering, 2023 - Elsevier
There was no literature that involved the combined investigation on the key geometries
optimization and the effect of variable operating conditions (temperature, pressure and …