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A B S T R A C T This paper investigates the opportunity of utilizing the spare heating capacity of CO 2 refrigeration systems in supermarkets to produce heat to be sold to district heating network operators. A comprehensive description and assessment of two control strategies that could be implemented to enable the heat export function are presented. To maximise the heating capacity during the coldest moments of the year, the integration of geothermal storage with the CO 2 system wasdoi:10.1016/j.applthermaleng.2021.117000 fatcat:ymnrzwz6bnfbfe3li3r3rtoz7q