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Theoretical evaluation of trans-critical CO2 systems in supermarket refrigeration. Part I: Modeling, simulation and optimization of two system solutions
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2008 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 31, no 3, 516-524 p.Article in journal (Refereed) Published
Abstract [en]

Using CO2 trans-critical system solutions in supermarket refrigeration is gaining interest with several installations already running in different European countries. Using a computer simulation model, this study investigates the performance of two main system solutions: centralized with accumulation tank at the medium temperature level and parallel with two separate circuits for low and medium temperature levels. Both system solutions are presented and the simulation model is described in details. Calculations have been performed to design the systems and optimize their performances where basic layout and size of each solution have been defined. For ambient temperature range of 10-40 degrees C, the reference centralized system solution shows higher COP of about 4-21% than the reference parallel solution. Using two-stage compression in the centralized system solution instead of single stage will result in total COP which is about 5-22% higher than that of the reference centralized system and 13-17% higher than that of the improved two-stage parallel system. The two-stage centralized system solution gives the highest COP for the selected ambient temperature range.

Place, publisher, year, edition, pages
Elsevier, 2008. Vol. 31, no 3, 516-524 p.
Keyword [en]
refrigeration system, supermarket, compression system, carbon dioxide, transcritical cycle, two-stage system, tank, modelling, simulation, optimization, cycles
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-17436DOI: 10.1016/j.ijrefrig.2007.05.017ISI: 000254677900019ScopusID: 2-s2.0-40049107791OAI: diva2:335480

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2015-11-30Bibliographically approved

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Sawalha, Samer
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