El-Cezeri Fen ve Mühendislik Dergisi | VOL. 5
Read

Energy and Exergy Analyses of Different Transcritical CO2 Refrigeration Cycles

Publication Date May 31, 2018

Abstract

Carbon dioxide has received increasing attention owing to its zero ODP and negligible GWP. Furthermore, carbon dioxide also has desirable thermodynamic properties, such as large specific heat, low viscosity, and large heat conductivity. Carbon dioxide CO 2 has low critical pressure and temperature which are 7.36 MPa and 31.1°C, respectively. The low critical temperature causes the heat rejection process to occur above the critical point and heat absorption process to happen below the critical point. However, due to the high throttling loss, the energy efficiency of the basic transcritical CO 2 cycle is lower than that of the conventional low pressure refrigeration cycle. In the present study three different kinds of transcritical carbon dioxide cycles that are the transcritical cycle with expansion valve (called also the conventional transcritical cycle), the transcritical cycle with expander and the transcritical cycle with ejector are analyzed. The effect of operating parameters on the maximum performance and exergy efficiency of the three cycles is investigated. Results reveal that replacing the expansion valve by an expander or an ejector does not only improve the maximum COP and the exregy efficiency but also reduces the optimal heat rejection pressure.

Concepts

Low Critical Temperature Transcritical Cycle Transcritical CO2 Refrigeration Cycles Large Heat Conductivity Low Critical Pressure Large Specific Heat Carbon Dioxide CO Carbon Dioxide Transcritical CO Dioxide CO

Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.

Climate change Research Articles published between Nov 21, 2022 to Nov 27, 2022

R DiscoveryNov 28, 2022
R DiscoveryArticles Included:  2

No potential conflict of interest was reported by the authors. The conception and design of the study, acquisition of data, analysis and interpretatio...

Read More

Coronavirus Pandemic

You can also read COVID related content on R COVID-19

R ProductsCOVID-19

ONE PROBLEM . ONE PURPOSE . ONE PLACE

Creating the world’s largest AI-driven & human-curated collection of research, news, expert recommendations and educational resources on COVID-19

COVID-19 Dashboard

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on “as is” basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The Copyright Law.