REFRIGERATION SYSTEM WITH INTEGRATED LIQUID LINE AND LOW ENVIRONMENTAL IMPACT

摘要

A design of a low charge refrigerating system based on microchannels technology for the condenser, a compact evaporator and a reduced diameter liquid line is presented. The design of the liquid line of a refrigerating system is specially detailed. Usually designed to avoid pre-expansion before entering in the expansion device, it is shown in this study that a drastic reduction of the pipe diameter is possible by cooling progressively the liquid. An adapted design using this principle, called "integrated liquid line" (ILL) has been developed and its impact on refrigerant charge and energy performance has been evaluated experimentally for a cold room refrigerating unit. A numerical model of the ILL, validated on this experimental device for various running conditions, has been developed and can be used as a design tool for other systems. Experimental measurements were performed and compared to a reference system. Coupled with micro-channel exchangers, a significant reduction of the internal volume and consequently of the refrigerant charge can been reached.