About the project
In a conventional refrigeration system, the compressor is typically sized to provide a cooling capacity higher than that required in normal operation. To keep the internal temperature of the refrigerator at proper levels, then the compressor is working in a mode alloy-and-off, which leads to fluctuations in temperature and energy waste. In order to achieve the "match" between heating load and cooling capacity, variable speed compressors have been used in some systems. However, as the expansion device is usually a capillary tube, a fixed restriction, such a "match" does not always occur efficiently. The need for action variable expansion devices is then evident. In this context, in recent years the pole has investigated electrical valves with different types of drive and hole sizes, in order to ascertain the applicability of such valves in both commercial refrigeration systems as domestic. The laboratory currently has a nitrogen flow measurement bench, also used for capillary tubes, and has a project for the construction of a specific bench for the characterization of electric valves aimed at domestic applications with HC-600a and HFC-134a.