Résumé :
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Most of the refrigerant used in commercial refrigeration is for supermarket systems. Typically these systems contain an extremely high number of connections, valves, tubes and other possible locations for leakages. Only a limited number of components can be premanufactured, assembled and tested at the point of manufacture, and the systems are assembled and installed on-site. In spite of careful assembly procedures, evacuation and leak testing, these systems are prone to leak refrigerant over time. It will be shown in this paper that the additional power consumption of the pump and the additional efficiency loss caused by the presence of the secondary heat exchanger does not necessarily lead to an increased power consumption for a secondary refrigerant system when compared to a primary system. This is due in part to the fact that suction line pressure losses are greatly reduced, but a major consideration is provision of an acceptable fluid for low temperature use (-40°C).
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