Rahmah, L.A. et al. 2019. Analyze The Effects of Helical Baffles Angles Variation On Shell Side Heat Transfer Coefficient And Pressure Drop of Shell And Tube Heat Exchange. SPECTA Journal of Technology. 2, 1 (Nov. 2019), 43–52. DOI:https://doi.org/10.35718/specta.v2i1.94.