18 May 2017

O.1.1.1 Integration of the hidden refrigeration capacity as heat pump in smart energy systems

This paper describes the potentials of extending the traditional supermarket refrigeration systems to a wider energy context consisting of flexibility enabled electrical and thermal networks. Supermarket systems can become decentral heat producers and export heat to available thermal networks beyond the normal waste heat recovery by utilizing present 70% stand-still capacity in the systems. This capacity can further be utilized to help balance the production/load on the electricity grid by an efficient conversion from electricity to heat, when the production from renewable sources like e.g. wind surpass the immediate consumption. Investigations are based on real supermarket cases and technology choices in the aspect of low GWP refrigerants are evaluated. Barriers like electricity prices versus system COP and framing conditions like Thermal network temperature lift is evaluated and a method of optimizing is suggested.