Browsing by Author "Akan, A.E."
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Article An Application To Error and Uncertainty Analysis in Industrial Type Dryer Experiments(Murat Yakar, 2021) Akan, A.E.; Ünal, F.In this study, information is given about the driers commonly used in the industry and the experimental errors and uncertainties that will be encountered in the experiments using these driers are tried to be explained by using the data obtained from the experiments carried out in an 8 chambers hot oil heated stenter, which is a conveyor type convection dryer. The fabric used in the experiments is the Thessaloniki type fabric, containing 67% cotton and 37% polyester. The experiments were carried out at a drying air temperature of 160 ºC and a fabric advance rate of 23 m/h (0.383 m/s). Thus, the example of error analysis in such experimental studies is provided and criteria that may cause an error for drying systems are discussed. As a result of the uncertainty analysis, the largest uncertainty in the system occurred in temperature measurements at ±0.367-±0.568 ºC values and the error rate for the whole system was found to be 4.08%. In terms of conducting the experiments in real production conditions and the materials and methods used in the experiments, this study is thought to will be help researchers that working on drying systems in their experimental studies. © Author(s) 2021.Article Investigation of Efficiency of R717 Refrigerant Single Stage Cooling System and R717/R744 Refrigerant Cascade Cooling System(Murat Yakar, 2021) Akan, A.E.; Ünal, F.; Özkan, D.B.This study is an adaptation of ammonia cascade cooling systems using carbon dioxide on ice cream production machines and includes thermodynamic analysis of R717/R744 cascade refrigeration system with R717 refrigerant single-stage refrigeration system and investigation of its efficiency. As a result of the analyses, the COP value of the single-stage system was 3.67, the Carnot efficiency was 0.57, the second law efficiency was 0.19 and the power required to operate the compressor was 27.55 kW. In the cascade cooling system, the COP value was 4.46, the Carnot efficiency 0.59 and the compressor power 22.7 kW in the high-temperature part, while the COP value was measured as 14.65, the Carnot efficiency 0.58 and the compressor power 6.4 kW in the low-temperature part. For the whole cascade system, the COP 3.24 and the second law efficiency were found to be 0.43. When the results were compared, it was concluded that although the COP value of the cascade cooling system was 0.43 points lower than the single-stage ammonia system, when our country's climate conditions and the thermophysical properties carbon dioxide gas were considered together, one of the most suitable designs was the cascade cooling system. © Author(s) 2021.