R404A alternatives evaluation in refrigeraton systems pipes

Abstract

Due to recently approved regulations in some developed countries, refrigerants with high GWP values are going to be banned or penalized levying high taxes. In this paper we obtain velocity and pressure drop deviation between R404A and different alternatives (HFC/HFC mixtures). The fluids selected are going to be used in mid-term commercial refrigeration: L40, DR-7, N40 and DR-33. Those parameters are calculated in suction, discharge and liquid lines. From results obtained it can be concluded that the alternatives show similar velocities (around ±10%) and lower pressure drops than R404A (until 70% below). So, using alternatives in R404A refrigeration systems will not be a problem in terms of pipe sizing. In addition, results are presented in graphics that allows obtaining the deviation between R404A and replacements considering several operative conditions.