ENERGY EFFICIENT HFO/CO2 CASCADE FOR AN ITALIAN SUPERMARKET

An Italian supermarket has installed a HFO-1234ze/CO2 cascade system with heat recovery which is saving about 35 % energy in comparison with conventional installations.

Instead of installing three separate refrigeration, heating and air conditioning systems, the cascade system is designed to provide in one system the heating, air conditioning and cooling needs, as the energy generated by the refrigeration system is transferred by a heat exchanger in order to heat the store, provide hot water, and cool the store in the summer.

HFO-1234ze is used as the primary refrigerant for cooling liquid CO2 in the medium temperature network, and cascaded to the low temperature CO2 refrigeration system.

Source :RAC