Comparative evaluation of flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles

•The flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers are measured and analyzed.•The heat transfer coefficients of R-1234ze(E) and R-134a are quite similar at the same mass flux.•R-1234ze(E) shows higher pressure drop than R-134a owing to the lower vapor density.•The correlations for the heat transfer and pressure drop of R-1234ze(E) are developed considering different Chevron angles.