Supermarkets are major energy consumers, typically in the range of annually 500kWh/m~2. Heat recovery from the refrigeration plant was early recognized as an efficiency strategy to diminish the energy bill. In the late years the use of carbon dioxide (CO_2) as refrigerant (R744) for food retail application has experienced a large success especially in northern parts of Europe due to environmental considerations and its ability to deliver heat to the ventilation system. This paper presents a comparison between three heat recovery schemes for a supermarket located in Norway, equipped with a R744 booster system. Hot gas heat recovery, pressure control (transcritical), and hot gas plus condensation heat recovery with a R744 heat pump are investigated on a monthly basis using climate data for 2010. Hot gas recovery only has a lower heat reclaim, pressure control and heat pump schemes do have a similar performance.
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