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Investigation of using Internal Heat Exchangers inCO(2) Trans-critical Booster System
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2014 (English)In: 11TH IIR GUSTAV LORENTZEN CONFERENCE ON NATURAL REFRIGERANTS (2014): NATURAL REFRIGERANTS AND ENVIRONMENTAL PROTECTION / [ed] Hu, W Zhao, G, INT INST REFRIGERATION , 2014, p. 453-460Conference 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 arethe 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 simultaneousrefrigeration and heat recoveryfor 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" iscalculated. It isshown 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 desuperheating improves the efficiency 3-4% for the cases with high amount of de-superheatingat 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
INT INST REFRIGERATION , 2014. p. 453-460
Keywords [en]
Supermarket, Carbon dioxide (CO2), Refrigeration, Heat recovery, Internal heat exchangers (IHX)
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-243759ISI: 000352781600051OAI: oai:DiVA.org:kth-243759DiVA, id: diva2:1289605
Conference
11th IIR Gustav Lorentzen Conference on Natural (GL2014). Hangzhou, China, August 31-September 2, 2014.
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-03-12Bibliographically approved

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CiteExportLink to record
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