Performance degradation assessment of rolling element bearings is vital for the reliable and cost-efficient operation and maintenance of rotating machines, especially for the implementation of condition-based maintenance (CBM). For robust degradation assessment of rolling element bearings, uncertainties such as those induced from usage variations or sensor errors must be taken into account. Thi...

In this study, hydrofluoroolefin R515B was used rather than hydrofluorocarbon R134a to perform energetic, exergetic, environmental and enviroeconomic analyses on vapor-compression refrigeration systems with internal heat exchangers. The exergy efficiency, destruction, coefficient of performance for cooling mode (COP) were studied. EES (Engineering Equation Solver) program employed thermodynamic...

The purpose of this research is in-depth understanding the internal causes exergy destruction in various parts system and to identify potential improvements for components. focus on a combined cycle power generation that utilizes organic Rankine (ORC) direct expansion (DEC). To investigate primary sources each component, advanced analysis (AEA) utilized. result demonstrates net out proposed can...

This research presents the energy, exergy, economic, and environmental assessment, multi-objective optimization of a flash-binary geothermal CCHP cycle. A sensitivity analysis production well inlet temperature cooling to power flow ratio on exergetic, parameters was conducted. Furthermore, effects inflation rate plant working hours economic were investigated. Results showed that increasing harm...

Hydrogen-based fluidized bed direct reduction (H-FBDR) is an important and promising route for fossil-free ironmaking. In this study, to achieve the optimal operation state of energy use exergy efficiency, influences metallization process ratios H2 injected on flows in H-FBDR are studied. The results show that thermodynamically designed two-stage (first: Fe2O3→FeO; second: FeO→Fe) requires a sm...

A lake ecosystem is continuously exposed to environmental stressors with non-linear interrelationships between abiotic factors and aquatic organisms. Ecosystem health depicts the capacity of system to respond to external perturbations and still maintain structure and function. In this study, we explored the effects of abiotic factors on ecosystem health of Taihu Lake in 2013, China from a syste...

In this paper, an attempt has been made to obtain nonsensitive solutions in the multi-objective optimization of a photovoltaic/thermal (PV/T) air collector. The selected objective functions are overall energy efficiency and exergy efficiency. Improved thermal, electrical and exergy models are used to calculate the thermal and electrical parameters, overall energy efficiency, exergy components a...

Thermoeconomic diagnosis of refrigeration systems is a pioneering approach to the diagnosis of malfunctions, which has been recently proven to achieve good performances for the detection of specific faults. Being an exergy-based diagnostic technique, its performance is influenced by the trends of exergy functions in the “design” and “abnormal” conditions. In this paper the sensitivity of perfor...