A basic CO2 transcritical/subcritical commercial refrigeration system is considered, applied
to cold rooms and display cabinets in a supermarket. Subcooling of the refrigerant or heat
recovery from condensation can be performed, taking advantage of a large fire prevention
water tank. The whole refrigeration system is modelled in a TRNSYS environment, taking
into account the hourly weather data and calculating the hourly cooling load demand from
display cabinets and cold rooms equipment. New types have been written to describe display
cabinets and cold rooms, CO2 refrigerating units and a particular water store.
Simulations consider a simple double compression cycle with liquid receiver, and other
options among which an auxiliary compressor. Results show that CO2 plants are feasible
and energetically acceptable in mild climates, provided that improvements to standard cycle
are adopted. Furthermore, heat recovery can be effectively performed through the employment
of a heat storag
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