The object of research includes the experimental evaporator, the model of a large Freon refrigeration plant, and technical-grade Freon R22. The purpose of the research is to assess the effect of the tube bank lane and regime parameters (saturation pressure and saturation temperature) on heat transfer during technical-grade Freon boiling in multi-row tube banks, as well as to continue studying the features of freon boiling processes in the evaporators of large refrigerating machines. The article shows the calculated dependences of the influence of regime parameters on heat transfer in the process of boiling Freon R12 and R22 in flooded evaporators with great height of experimental tube bank. The visual observations of the boiling process have been described. Calculated dependences of heat transfer along the tubes in the tube bank have been obtained, the character of heat transfer changes and temperature distribution according to the height of the tube bank has been defined.

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