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Performance investigation of a flexible multi-evaporator domestic refrigerator/freezer system with integrated economization.

Number: 2487

Author(s) : LIANG C., LIU H., BRAUN J. E., GROLL E. A., ZIVIANI D.

Summary

Domestic refrigerator/freezers account for approximately 4% of all energy consumption around the globe and mainly rely on vapor compression cycles to operate. Researchers have investigated alternative cycle architectures such as dual-loop cycles and parallel circuit cycles to improve their efficiencies. Despite the demonstrated energy saving potential of these advanced cycles, additional implementation costs are often not justifiable. However, to meet forthcoming stricter energy standards while ensuring flexible multi-temperature operation of domestic refrigerator/freezers, advanced cycle architectures are needed. In previous work, a two-stage vapor-injected vapor compression cycle with multi-evaporator system was investigated for its energy saving potential and cost-effectiveness. The cycle establishes two separate evaporation temperatures to better match the cabinet temperatures of fresh food compartment and freezer compartment. The reduced difference between cabinet temperature and its evaporation temperature decreases the irreversibilities in the heat exchanger and improves overall system efficiency. With simplified two efficiency-based compressor models (compressor efficiencies equal to that of baseline compressor), the cycle model prediction showed up to 13% energy consumption reduced with respect to the baseline system. In this work, a reduced-order model of a vapor-injected reciprocating compressor was integrated into a previously developed dynamic system level model to obtain more realistic and higher fidelity results. The reduced-order model considers the injection thermodynamic state and timing as well as evaporating and condensing temperatures from the system operation. By utilizing the compressor model, 21.3% energy consumption reduction was achieved with respect to the baseline system.

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  • Original title: Performance investigation of a flexible multi-evaporator domestic refrigerator/freezer system with integrated economization.
  • Record ID : 30033049
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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