Natural refrigerants are today more and more proposed as a ready to use solution in commercial refrigeration. For this reason there is a constant technological improvement of “green” system, with special reference to CO_2 trans critical installations. The key to success is to simplify trans critical technology and enhance efficiency and reliability. This paper present a new solution called FTE (Full Trans critical Efficiency) that has been developed in order to increase reliability and efficiency in a simple design of the system. This solution adds to the system an intermediate liquid receiver located between refrigerated cabinet and the compressors which permits to overfeed the refrigerated loads operating without any superheat and, as consequence, to increase the evaporator temperature and the efficiency. This additional intermediate liquid receiver collects the liquid that’s coming out from the refrigerated loads and delivers the liquid accumulated directly to the frozen loads. FTE is a system solution that can be adopted in all the climates and that increase the efficiency during the whole year. This study has the scope to describe and demonstrate the benefit of the FTE comparing to standard trans critical system. To support the theoretical analysis real consumption of a store installed in South of Europe will be highlighted.
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