Gazi Üniversitesi Fen Bilimleri Dergisi (Sep 2021)
An Experimental Study Towards Decreasing the Energy Efficiency Index Value in Industrial Refrigerators
Abstract
Energy labeling is performed according to the energy efficiency index (EEI) value in industrial coolers. In order to reduce the EEI value calculated according to the amount of energy consumed and the characteristics of the cooler. Two systems were designed in this study and the energy label class of the coolers was determined according to the obtained results. In this study, two different coolers (Type 1 and Type 2) were designed, manufactured and tested. The systems are designed using R290 (propane), a new generation natural and environmentally friendly refrigerant with two inlet-outlet evaporators, double condensers and double compressors to provide a homogeneous cooling. During the experiments, temperature-pressure measurements of the cooled products and cooling system equipment were taken from certain points every minute and test data were recorded. In the experiments, the average air temperature and relative humidity values of the test chamber of the experiment with resistance glass in the Type 1 cooler were measured as 25 ℃ and 59.09%, respectively, the average air temperature and relative humidity values of the test room of the Type 2 system experiment with antifogging film were measured as 25.231 ℃ and 57.207%, respectively. In the experiments, defrosting process was carried out twice a day in the coolers. During the experiment, the highest and lowest average temperatures of the cooled products were measured as -16.18 ℃ and -19.40 ℃. Increasing product temperatures during defrosting and stopping cooling increased the power consumption in the system. As a result of the calculations, the energy efficiency index value of the Type 1 resistance model was calculated to be 60.53 and it was seen that the energy label was class “E”. In the Type 2 model in which anti-fog coating film is used, the energy efficiency index value is 49.25 and it has been observed that the energy label is class "D".
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