سید شرف الدین حسینی

In the present investigation, the energy, exergy, economic and environmental (4E) characteristics of a waste heat recovery (WHR) system including a dual-loop Organic Rankine Cycle (ORC) and a heavy-duty diesel was investigated. The proposed system recovers the available waste heat of the engine exhaust gas, intake air, and the coolant. Central composite design (CCD) which is a standard technique of response surface methodology (RSM) was employed for the design of experiments (DoE). Parametric study of the output responses to the effective input parameters was performed. The results showed that increasing the amount of the engine variables led to a significant increase in power production and exergy destruction rate of the system and vice versa. The minimum amount of payback period (5.57 years) was observed in the high values of the engine parameters. The maximum output power of the WHR system was 330 kW, which was equal to 33% of the diesel engine brake power. The maximum value for the sustainability index was also observed at approximately 3.28.

This study used the finite volume method and ANSYS software to investigate the effect of elbow air duct vane structures on its performance. Elbow air ducts are among the most widely used ducts in HVAC systems, and changes in their geometry and structure have a significant impact on their performance. The purpose of this study is to investigate changes in the structure of elbow air duct vanes from simple to several different models. These changes include zigzag, semicircular, and sinusoidal vanes with different sizes and pitches, comparing them with a simple vane. Therefore, changes in the temperature, velocity and pressure fields of the air flow in the elbow duct are evaluated. The results of this research show that using zigzag vanes, with smaller pitches, whose lateral ends are facing downwards, causes more disturbance in the air flow in the elbow duct, and increases the heat transfer with the environment. The vane edge tips also had an impact on the amount of disturbance. Also, using sinusoidal vanes has reduced the pressure on the outer radial wall of the elbow air duct. So that, respectively, the use of sinusoidal and simple straight vanes created the lowest and highest pressure levels for the outer wall of the elbow air duct

Bitumen is one of the most widely used materials in industries, especially the road and construction industry. In this research, an attempt has been made to investigate and compared the effects of changes in the physical properties of bitumen composites containing recycled materials such as Hair, Fleece, Glass powder, stuffed chicken and Sawdust with pure bitumen to improve pure bitumen features. Using recycled materials either to save the environment as well as reduce the cost of final material.

This experimental research is used standard and validated methods to investigate thermal conductivity, sound transmission, viscosity, angularity, permeability, and compressive strength.

 Results has shown that the use of sawdust enhances thermal and strength resistance and also use of human hair enhances sound resistance of this pure material. In general, these additives had an adverse effect on viscosity of the raw material. But no significant effect was observed in the compressive strength of the raw material.

 according to this investigation, adding recycled materials can improved some of properties of pure bitumen and as for type of bitumen usage in special industry, it can applied amplifier recycled additive in bitumen.

One of the main concerns of the environmental activists is felling the trees to produce wooden accessories. This action has a detrimental effect on the environment and the earth's climate, and efforts to find an alternative product seem essential. Due to the reduction of natural wood resources, along with the increase in demand for wood products, it is essential to produce recycled composites that replace wood. Since the skin structure of walnuts and pistachios can only be crushed and pulverized, they can be employed to prepare chipboard. In this experimental research, composite samples composed of the chipboard family were made using walnut and pistachio hardwood, and their physical properties were investigated. The obtained results revealed that the composites made are denser than ordinary chipboard. Despite the fact that such composites are slightly higher thermal conductivity, they have better fire resistance. The firing time for hard skin samples of walnut fruit and walnut/pistachio was 69% and 84% longer than ordinary chipboard. Due to the piece structure, the composites had a smoother cutting surface and showed a Crisp and fragile body behavior against bending. The electrical behavior of the composites was not significantly different from that of ordinary chipboard.

The supply of required cooling energy for building and industrial applications, along with simultaneous efforts to reduce environmental pollution and also reduce electricity consumption and related costs, are a concern that has been considered by researchers for years. Required cold load in most parts of Iran is higher than for heat load. In hot and humid areas where we have to use compression refrigeration systems with high power consumption, it seems more necessary to find alternative methods. In this research, a new design in the form of a cold water cycle in a copper pipe that can be installed on domestic fans has been proposed which can also significantly reduce power consumption and be able to replace the compression cooler in times of moderate temperature. The results showed that in times of moderate heat, this alternative system can be used and create similar cooling conditions with air conditioners and cusses a reduction up to 90% in electricity consumption. Also, the return on investment in this project was calculated for about one year.