Relative Performance of Aluminum and Galvanized Steel Evaporators
Author: Mark C. Stencel, Gary W. Price and Mark G. Strauss, Ph.D.
While both aluminum and galvanized steel evaporators are widely used in industrial refrigeration, a general disparity of opinion exists within the industry regarding the influence of the material of construction on evaporator performance. The primary goal of the study undertaken was to develop a model for predicting evaporator performance using widely accepted engineering calculations, design characteristics inherent in industrial evaporators and the differences in the physical characteristics of materials. Further, the validity of such a model was substantiated through independent testing of identical coils (excluding material of construction) at the test facilities of a major university. These tests were conducted with the intent of minimizing the influence of variables associated with refrigeration and focusing solely on the relative heat transfer performance of evaporator coils manufactured of two different materials.