The performance of a photovoltaic/thermal (PVT) system in Irbid -Jordan climate conditions is numerically investigated using TRNSYS Software. The PVT system is designed to produce both electricity and hot water simultaneously. In this research work, a PVT system is tested in Irbid, which is located in the northern region of Jordan (32.50 N, 35.90 E). The effects of the factors that affected the performance of PVT were theoretically studied. They included global solar radiation, water temperature, mass flow rate, wind speed, and tilted angle. The type of PV cell under consideration is polycrystalline (Po-Si). The results show that the maximum electrical efficiency was 18% and the thermal efficiency was 42%. The optimum tilt angle for thermal efficiency was nearly 28°, while electrical efficiency was 44%. The mass flow rate of water under which the thermal and electrical efficiencies are at their maximum is equal to 20 kg/hr. Also, the results reveal that as the temperature of the city water decreases, the electrical efficiency rises and the thermal efficiency drops.
One of the most challenging tasks in machining hard materials is to achieve super high precision with excellent surface finish. The reasons can be addressed due to its properties including high work hardening and poor machinability. Abrasive water jet (AWJ) machining is a multi-operational activity which is proven technology for generating high precision components. The carried-out work mainly intended to showcase the technical parameters which are prime importance in commercial and domestic applications. There parameters include water pressure, traverse speed, abrasive feed rate. These parameters were analyzed with respect to kerf taper and surface roughness on X5CrNi18-10 steel. In the present work key parameters such as traverse speed and outlet pressure were varied from 100 -200 mm /min and 100 -200 MPa, respectively. Apart from these two parameters abrasive feed rate was also varied in the range 360 -540 g/min. Our data from experimental procedures indicate that kerf taper and surface roughness were greatly deflect by variations in the three major parameters; traverse speed, water pressure, and abrasive feed rate. To ensure better comparison of work optimization of process parameter was also carried out. In this optimization response surface methodology and central composite design method was enabled. In addition, all the needed mathematical models were enabled and set of desired contour graphs for tested surface quality are systematically represented. Finally, the kerf taper angle behaviors were also carried out using ANOVA analysis powered by MINITAB 19.
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