Improvements in Commercial Refrigeration

Under a subcontract with ORNL, Foster-Miller has assessed several system concepts that feature greatly reduced refrigerant charge and emission levels, and integration of the stored heating/cooling equipment to recover the refrigeration reject heat for space heating. A field demonstration of a distributed refrigeration/water-source heat pump HVAC system is planned for 1999 or 2000 in collaboration with a supermarket chain and electric utility in Massachusetts and EPRI. The analyses showed that this system could achieve about 20% primary energy savings in the Massachusetts area compared to a state-of-the-art conventional refrigeration/HVAC arrangement.

In addition to the field testing project, an overall assessment of supermarket energy use is planned to identify ways to reduce energy use and TEWI. The resulting information will be used in an application guide with an accompanying spreadsheet model for use by supermarket planners and engineers in designing low-impact stores.
Total equivalent warming impact (TEWI) for representative supermarket
refrigeration system: conventional (direct expansion) and advanced
(secondary loop and distributed) systems.

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