Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Investigation of using Internal Heat Exchangers in CO2 Trans-critical Booster System
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-2895-774X
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2014 (English)In: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014, 2014, 453-460 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper theoretically investigates the performance of a CO2 trans-critical booster system using various configurations of internal heat exchangers (IHX). A reference case performance is compared with eight alternatives of using IHXs after the gas cooler and liquid receiver. Cooling COP, total COP and amount of heat recovery are the comparison criteria. Heat recovery or heat rejection from the discharge gas of low stage compressors is another modification examined in this study.

According to the results, no significant improvement is found by using internal heat exchanger (IHX) focusing only on the cooling COP. Considering simultaneous refrigeration and heat recovery for a sample 65 bar discharge pressure, up to 12% efficiency improvement with IHX A-AC-AD for a system “with by-pass” and up to 11% improvement with IHX AC-AD-BC-BD for a system “without by-pass” is calculated. It is shown that superheating has less influence on the available heat to be recovered in the trans-critical region in comparison with the sub-critical region. Furthermore, low stage level heat recovery and de-superheating improves the efficiency 3-4% for the cases with high amount of de-superheating at low stage suction line, using IHX C or D.

To conclude, using IHXs improves the performance of the CO2 booster system with heat recovery. This improvement is more significant in sub-critical region.

Place, publisher, year, edition, pages
2014. 453-460 p.
Keyword [en]
Supermarket, Carbon dioxide (CO2), Refrigeration, Heat recovery, Internal heat exchangers (IHX)
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-175686Scopus ID: 2-s2.0-84932105055ISBN: 978-236215004-3 (print)OAI: oai:DiVA.org:kth-175686DiVA: diva2:861915
Conference
11th IIR Gustav Lorentzen Conference on Natural Refrigerants; Hangzhou, China, August 31-September 2, 2014
Projects
EFFSYS+
Funder
Swedish Energy Agency, EP06
Note

QC 20151216

Available from: 2015-10-19 Created: 2015-10-19 Last updated: 2015-12-16Bibliographically approved

Open Access in DiVA

No full text

Scopus

Authority records BETA

Karampour, Mazyar

Search in DiVA

By author/editor
Karampour, MazyarSawalha, Samer
By organisation
Applied Thermodynamics and Refrigeration
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 38 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf