Within the scope of the F-gas regulation there is a trend towards future proof technologies usinghydrocarbons, CO_2 or other low GWP refrigerants. In supermarket refrigeration, the integral displaycase architecture is one of these technologies because it allows for using the flammable hydrocarbonpropane (R290).The integral display case architecture consists of refrigerant circuits for each display case whichreject heat to a water or brine loop. For the application with R290 it uses multiple circuit systems withlow charge each (<150 g) to comply with international product standards (IEC60335-2-89). Withsafety regulations allowing for larger quantities of R290 per refrigerant circuit, it will be possible touse single circuit designs and therefore benefit from the variable speed compressor technology.The paper presents an integrated solution for water cooled integral display cases that supportsmanufacturers in dealing with the technical challenges associated with new refrigerants such ashydrocarbons and variable speed technology. The solution includes a variable speed scrollcompressor designed for the use of R290, a variable frequency drive, electronic expansion valve,safety devices and a system controller. The focus is on the optimization of the system efficiency andcontrol as well as the design for limited refrigerant charge.
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