The factory operated Robert’s type calandria evaporators, with two (2787 and 2322 m2) pre evaporators in parallel and three sets of triple-body evaporators (1148 m2 each) in parallel; R t values were 11.4 and 9.5 min in the two pre evaporators, respectively, and increased from 10.0 to 21.8 min across the triple bodies.