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Energy Consumption Evaluation of Indirect Systems with CO2 as Secondary Refrigerant in Supermarket Refrigeration
KTH, Superseded Departments, Energy Technology.
KTH, Superseded Departments, Energy Technology.ORCID iD: 0000-0002-9902-2087
2003 (English)Conference paper (Refereed)
Abstract [en]

In this study, we investigate the influence of the pressure and temperature drops in the suction and return lines on the energy consumption of a supermarket refrigeration plant. We calculate the energy consumption of CO2indirect systems with R404A, ammonia or propane as the primary refrigerant and compare it to conventional direct expansion (DX) system with R404A or R502. CO2pressure drop and the corresponding saturation temperature drop in the indirect circuit is calculated and compared to that of R404A. The energy consumption of R404A/CO2indirect systems was found to be very close to R404A-DX system using the same pipe size in the return and suction lines. Replacing R404A by ammonia or propane in the indirect system reduced the energy consumption. This study indicates that it is more economical to use CO2indirect system with proper primary refrigerant rather than using the conventional DX systems.

Place, publisher, year, edition, pages
National Category
Energy Engineering
Research subject
SRA - Energy
URN: urn:nbn:se:kth:diva-62904OAI: diva2:481320
21st IIR International Congress of Refrigeration. 2003, Washington, D.C. USA
Qc 20120228Available from: 2012-02-28 Created: 2012-01-20 Last updated: 2012-02-28Bibliographically approved

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