EXPERIMENTAL ANALYSIS OF THE AIR DEFROST PROCESS IN AN INDUSTRIAL COOLING SYSTEM

Abstract

Keeping product temperatures homogeneous is an important problem in defrosted industrial coolers.In this study, it is aimed to obtain findings that will shed light on researchers and producers byanalyzing the defrosting process of the industrial cooler. For these reasons, the system was designedusing R290 (propane), a new generation refrigerant with a single evaporator, double condenser anddouble compressor, in order to ensure homogeneous cooling. By keeping the cooled products in therange of – 1 ℃ and +5 ℃ as required by the standard, during the experiment, temperature-pressuremeasurements of the refrigerated products and cooling system equipment were taken from certainpoints every minute and test data were recorded. The average temperature and relative humidityvalues measured minute of the environment where the experimental setup is located was calculated as25℃ ±1℃ and 60% ±0.02%, respectively. During the experiment, eight defrost operations wereperformed, and it was observed that the average temperature values taken from the products during the24 hours during defrosting changed to 3.07℃. During the experiment, the highest and lowesttemperatures of the cooled products were measured as 4.22℃ and 2.02℃. Increased producttemperatures and cooling stopped during defrosting increased the power consumption in the system.In order to observe the effect of the power consumption on system performance, COP values aftereach defrost time were calculated as 2.31, 2.30, 2.29, 2.60, 3.36, 3.29, 3.30, 3.49, respectively. Whenthe defrost process of cooling system analyzed, it was seen that the products were successfully cooledat desired temperature ranges in the scope of TS EN ISO 23953-2.