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Operating evaluation of a cooler and a freezer used for freezing of small wheat bakery products

The aim of this study was to perform the operating evaluation of a HEINEN arctic a7/12 and a7/24 spiral-belt cooler and freezer used for freezing of small wheat bakery products – kaiser rolls – operating in a Warsaw bakery. Usable heat, heat received from the raw material (net heat), output of electric motors, enclosure heat gain, air infiltration gain, belt cooling heat as well as capacity and efficiency of the cooler and freezer were used to make an operating evaluation of both devices. The cooler with the capacity of 1113 kg/h showed an efficiency of 70.8%, while the efficiency of the freezer with the capacity of 1109 kg/h was only 54.6%. The usable heat in the process of freezing of kaiser rolls was almost 2.5 times greater than the usable heat in the cooling process. Real values characterizing the cooling and freezing process were also determined: time of both processes, temperature distribution, and weight loss in the product. The weight loss of a kaiser roll after the cooling process constituted 8.65% of the mass of the raw product, and after the freezing process it constituted 9.51% of the mass of the raw product. The obtained results were compared with the data of the manufacturer of both devices.