Go to menu
Go to content
Go to footer

IIR document

Alternative positions of internal heat exchanger for CO₂ booster refrigeration system: Thermodynamic analysis and annual thermal performance evaluation.

Author(s) : LIU S., WANG J., DAI B., YANG X., NIAN V., LI H., YUAN J.

Type of article: IJR article

Summary

Refrigeration systems running on transcritical CO₂ cycle are considered an alternative to phase-down the use of hydrofluorocarbons (HFCs) in response to the Kigali Amendment. Responding to the need to improve the efficiency of CO₂ booster systems and to identify optimum system designs, thermodynamic models of three booster systems are proposed with the use of an internal heat exchanger (IHX). Findings from this study suggest that placing the IHX with a low-temperature fluid side at the suction line of high pressure stage compressor and high-temperature fluid side at the outlet of gas cooler represents the most optimal approach in improving the coefficient of performance (COP) of the booster system. When operating in the transcritical conditions, the COP values can be improved by 6.35% at the IHX thermal effectiveness of 0.8 and by 6.48% at the ratio of medium temperature load to low temperature load of 6. Using IHX can significantly reduce the compressor discharge pressure, which can be reduced by 0.55 MPa at the ambient temperature of 40 °C. Furthermore, by adding IHX, the annual performance factor of CO₂ system can be improved significantly by 1.68% and the annual total power consumption can be decreased by 6.48% in the tropical climate. It can be concluded that IHX can improve the COP values of a booster system when operating in the subtropical and tropical regions.

Available documents

Format PDF

Pages: 1016-1028

Available

Public price
20 €
Member price*
Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

Original title: Alternative positions of internal heat exchanger for CO₂ booster refrigeration system: Thermodynamic analysis and annual thermal performance evaluation.
Record ID : 30029203
Languages: English
Subject: Technology
Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
Publication date: 2021/11
DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.05.003
Document available for consultation in the library of the IIR headquarters only.

Links

See other articles in this issue (95)
See the source

Indexing

Themes: Evaporators, condensers and other heat exchangers;
CO2;
Supermarkets, display cabinets
Keywords: Transcritical cycle; Booster; CO2; Heat exchanger; Thermodynamic property; Thermal analysis; Performance; Modelling; COP; Energy consumption; Case study; China; Tropical climate; Cold climate; Temperate climate