Work accidents are serious issues that disrupt harmonious environment in workplace. They cause not only death, injury or disability of employees, but also serious financial loss for businesses and countries. Work accidents are highly preventable incidents, when necessary, precautions are taken. Like the whole world, in Turkey also there are risky sectors where work accidents are intensified. The identification of risky sectors in Turkey, is the first step of being able to fight against work accidents in this sector. Therefore, in this study the riskiest sectors in Turkey were investigated basing on the official accident data from the last ten years. Thus, first of all, the sectoral distribution of work accidents, death and permanent incapacity cases that occurred in Turkey in 2010-2019 was examined. Sectors were evaluated in terms of six different parameters: the number of work accidents, the number of deaths because of work accidents, the number of permanent incapacities because of work accidents, general accident incidence rate, fatal accident incidence rate, and permanent incapacity accident incidence rate. The top ten sectors with intensity have been determined for each parameter. Then, all these data were combined and the ten most risky sectors in Turkey in terms of work accidents were defined. In the last 10 years, the sector of "41-Building Construction" has been found to be the riskiest sector in Turkey, where the most work accidents have occurred, the most employees die and the most employees are permanently disabled. On the other hand, the "05-Mining of Coal and Lignite" sector, in which the general accident incidence rate, fatal accident incidence rate, and permanent incapacity accident incidence rate values are the highest, was the second most risky sector.

Engineering Equation Solver program (EES). For certain temperature limits in the first and second stages (S-I and S-II) R245fa + R245fa was used as refrigerant pair. This study aims to determine the effect of working temperature on system efficiency, exergy efficiency and the most suitable working temperature. The results showed that at 425K, 14.11kW exergy destruction is obtained in Pump-1 higher than other components. The smallest exergy destruction is 0.133kW is observed in Turbine-2 at 400K temperature. The highest thermal and exergy efficiencies of the whole system were obtained at 400K temperature as 8.85% and 48.55%, respectively.