Cabello, R.Torrella Alcaraz, EnriqueLlopis, R.Sanchez, D.2018-04-192018-04-1920100360-5442https://riunet.upv.es/handle/10251/100724[EN] This work presents an experimental evaluation, from an energy analysis point of view, for two of the most used inter-stage systems in two-stage vapour compression cycles driven by compound compressors: the direct liquid injection and subcooler systems. The evaluation, considers the two-stage cycle with no intermediate systems as reference cycle and was performed on a plant, driven by a compound compressor using the refrigerant R404A for an evaporating temperature range of -36 to -20 degrees C and for a condensing temperature range of 30-47 degrees C. The analysis of the results shows that the inter-stage systems determine the performance of the energy parameters, which are discussed in the paper. The configuration yielding the best results was the two-stage compression cycle with subcooler, since the cooling capacity and COP values for this configuration were the highest. Conversely, the two-stage compression cycle working with direct liquid injection showed lower performance from an energy point of view, though this configuration allows a substantial reduction of the discharge temperature.Reserva de todos los derechosTwo-stage systemIntermediate injectionSubcoolerCompound compressorR404AMAQUINAS Y MOTORES TERMICOSArtículo10.1016/j.energy.2009.11.009Cerrado