Fatih Yilmaz

Prediction of Thermodynamic and Thermophysical Properties of Carbon Dioxide

CO2 may be an important alternative refrigerant to hydrofluorocarbons in commercial refrigeration systems. CO2 is one of the few natural refrigerants that is neither flammable nor toxic. It is inexpensive, widely available, and does not affect the global environment as do many other refrigerants. In this study, alternative methods are presented using artificial neural networks and adaptive neurofuzzy inference systems to determine thermodynamic and thermophysical properties of CO2. The results of the artificial neural network model are compared with those of the adaptive neurofuzzy inference system model in which the same datasets are used. The artificial neural network model is much better than the adaptive neurofuzzy inference system model. A new formulation is presented for the determination of the thermodynamic and thermophysical properties of CO2. The results of this study show that the artificial neural network model is an excellent alternative method for the calculation of thermodynamic and thermop...

Environmental Impact Assessment of Electricity Production, A Case Study of Turkey

For at least the next few decades, fossil fuels will use for global energy demand and without a proper control atmospheric emissions. Therefore greenhouse gas (GHG) emissions continue to increase and pose even more serious problems for environment and also human health. Beyond this point, the combustion products of fossil fuels are the main cause of environmental issues such as acid rains, ozone depletion and global warming.

Performance Analyses of CO 2 -N 2 O Cascade System for Cooling

The excess usage of many refrigerants which includes chlorofluorocarbons (CFC) and hydro chlorofluorocarbons (HCFC) in cooling systems causes several environmental issues such as acid rain, stratospheric ozone depletion and global climate change. Therefore, the usage of these refrigerants is restricted. In this context, an increase occurs in the usage of the alternative refrigerants.