Performance Evaluation of Liquid-Cooled Open Stand-Alone Refrigerated Cases

Research output: NRELTechnical Report


This project is part of a joint effort between Commonwealth Edison Company (ComEd) and the National Renewable Energy Laboratory (NREL) to evaluate the energy and demand savings potential of emerging efficient buildings technologies. This project quantifies the energy efficiency benefits from retrofitting an air-cooled, constant-speed compression, self-contained medium-temperature open-vertical display case with a high efficiency water-cooled condensing unit. In addition to a water-cooled heat rejection mechanism, the high-efficiency condensing unit utilizes a variable-speed compressor, electronic expansion valve and advanced controls system. The focus of this project, however, was mainly on capturing the energy savings potentials of the water-cooled condenser, variable-speed compression and electronic expansion valve, and not on the advanced controls. The results of this evaluation will be considered by ComEd and CLEAResult for future energy efficiency rebate offerings.
Original languageAmerican English
Number of pages97
StatePublished - 2023

Bibliographical note

Produced under direction of ComEd by the National Renewable Energy Laboratory (NREL) under Technical Services Agreement TSA-19-01159

NREL Publication Number

  • NREL/TP-5500-81945


  • liquid-cooled condenser
  • liquid-cooled refrigeration
  • refrigeration
  • self-contained
  • stand-alone refrigeration
  • supermarket refrigeration


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