جستجوی مقالات مرتبط با کلیدواژه "کووید-19" در نشریات گروه "مهندسی شیمی، نفت و پلیمر"

In this work, the performance of a solar system, in more detail, the thermal photovoltaic system is investigated. Numerical study has been done through coding in MATLAB software and by simultaneously solving equations related to the electrical and thermal parts, which provides the possibility of performing various investigations on the system. It is noteworthy that the PV part of this code, which is entirely accurate, can also use independently for photovoltaic systems. Numerical study has three features: parametric study, and collector performance in one day and in one year. As the wind speed increases from zero to 14 m/s, the electrical efficiency increases by about 4%, the thermal efficiency decreases by about 22%, and the overall efficiency of the system decreases by 18%; Therefore, there is a possibility of drastic changes in the performance of the system with changes in wind speed. By increasing the amount of radiation from 350 to 1050 W/m2, the electrical, thermal and overall efficiency shows a 1% decrease, 16% increase and 14% increase, respectively. Assuming an increase in the ambient temperature from 5 to 60 oC, the electrical efficiency decreases by 2.5%, the thermal efficiency increases by 0.5% and the overall efficiency decreases by 2%. Also, the results show that the thermal output power of the photovoltaic thermal system varies between 280 and 460 Watts and the electrical output power varies between 120 and 190 Watts throughout the year.

In recent years, when air pollution has become more serious, and especially in January 2020, when the emergence of a new virus called Covid 19 caused the death of a large number of people, the production and use of masks increased. Since the outbreak of severe respiratory illness caused by the coronavirus, the use of face masks to control the rapid spread of the epidemic and prevent the transmission of pathogenic viruses has become widespread around the world. Therefore, in these critical situations, it is necessary to observe hygiene and use protective equipment such as masks to protect your health and the health of others. The current Corona epidemic has also brought many economic problems to today's society, so the world is currently facing a shortage of face masks and masks are not available on all days and weeks, which has led to Dangerous events occur especially for medical personnel. As pathogens such as bacteria, fungi and viruses are becoming a serious threat to human health and the environment around the world, and the use of masks to protect against them. It is necessary to find ways to antivirus the mask and reuse it. This article explains the importance of masks, antimicrobial agents for masks and how to evaluate some of the properties of masks, as well as some antimicrobial, antiviral and antiseptic methods of different types of masks and research done in this The context is addressed.