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Laboratory evaluation of a commercial CO2 booster refrigeration system.

Number: pap. 2286

Author(s) : FRICKE B., ZHA S., SHARMA V., et al.

Summary

The traditional multiplex direct expansion (DX) refrigeration system used in commercial applications is prone to significant refrigerant leakage, especially older existing systems. The use of high Global Warming Potential (GWP) refrigerants in these systems, combined with high refrigerant leakage, can result in considerable direct carbon dioxide equivalent (CO2eq) emissions. In addition, commercial refrigeration systems consume a substantial amount of electrical energy, resulting in high indirect CO2eq emissions. Thus, there are ongoing efforts to reduce both the direct and indirect environmental impacts of commercial refrigeration systems through the use of leak reduction measures, refrigerant charge minimization, low GWP refrigerants and energy efficiency measures. Based on prior energy and life cycle climate performance (LCCP) analyses, it was determined that a transcritical CO2 booster refrigeration system for supermarket applications has the potential to reduce carbon emissions and increase energy efficiency. To that end, a lab-scale transcritical CO2 booster refrigeration system was fabricated and installed in the environmental test chambers at the Oak Ridge National Laboratory (ORNL). The performance of the transcritical CO2 booster refrigeration system was evaluated over an outdoor ambient temperature range of 15.6 to 32.2°C. Compressor power was found to increase by approximately 78% over this same temperature range while the refrigeration load remained relatively constant. The resulting coefficient of performance (COP) of the system was found to vary from 2.2 (at an outdoor ambient temperature of 32.2°C) to 4.1 (at an outdoor ambient temperature of 15.6°C). Based on the laboratory evaluation, the transcritical CO2 booster refrigeration system demonstrates promise as a low emission, high efficiency alternative to the traditional multiplex DX systems currently in use.

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Pages: 10 p.

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Details

  • Original title: Laboratory evaluation of a commercial CO2 booster refrigeration system.
  • Record ID : 30018778
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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