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YİĞİT, ABDULVAHAP

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YİĞİT

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ABDULVAHAP

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2015 - 201912020 - 20221
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    Publication
    Transient thermal modeling and performance analysis of photovoltaic panels
    (Wiley, 2022-12-07) Yiğit, Abdulvahap; Arslanoğlu, Nurullah; Gül, Hakan; YİĞİT, ABDULVAHAP; ARSLANOĞLU, NURULLAH; Mühendislik Fakültesi; Makine Mühendisliği Bölümü,; 0000-0003-4970-4490; CIJ-7410-2022; FXK-0953-2022
    Photovoltaic technology enables the direct conversion of solar energy into electrical energy. Model studies have a very crucial place in the implementation of PV systems. Electrical efficiency decreases with increasing PV panel temperature. So, solar panel temperature is an important parameter that needs to be reduced to obtain a better energy efficiency from PV panels. In this study, the aim is to develop a simple method that can estimate the temperature of a solar panel. It can utilize different methods to obtain the thermal responses of a PV panel. In this study, a modeling study was carried out to find panel temperature, efficiency and power values under transient ambient conditions. As a simpler approach, "lumped system analysis " method was used. The model developed in this study can simulate the thermal performance of the PV panel under transient conditions. After the model is defined for a particular PV panel, the required inputs are; total incident solar radiation, wind speed and ambient temperature. The results obtained from this model were compared with existing modeling and experimental studies in the literature. With the simulation using the model developed in this study, panel efficiency, temperature and panel electricity power were calculated using instantaneous environmental data for the selected Konya and Sanliurfa (Turkey) regions. In this paper, it was obtained that the wind speed increased the PV panel efficiency, while the ambient temperature decreased it. Depending on the increase in wind speed (1-2 m/s), the increase in PV panel electric power is 3.7%, while the increase in high wind speeds (5-6 m/s) decreases to 0.77%. It was found that a 7? increase in ambient temperature caused a 4? increase in PV panel temperature and a 1.5% decrease in PV electrical power generation. The PV panel electrical power values calculated using the efficiency values calculated according to the daily average environmental temperatures were found to be 13% higher than the power values calculated using instantaneous environmental temperatures. If this difference is not taken into account in the calculation of economic payback periods, it will lead to significant erroneous results. The importance of transient simulations of the PV panel has been demonstrated by the calculations.
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    Experimental investigation of the effect of thermal comfort parameters on cervical range of motion
    (Elsevier, 2015-11-01) Yiğit, Abdulvahap; Atmaca, İbrahim; Arslanoğlu, Nurullah; Sivrioğlu, Koncuy; YİĞİT, ABDULVAHAP; ARSLANOĞLU, NURULLAH; SİVRİOĞLU, KONÇUY; Tıp Fakültesi; Fiziksel Tıp ve Rehabilitasyon Ana Bilim Dalı; 0000-0003-4970-4490; 0000-0002-4296-9480; AAG-8211-2021; AAG-8193-2021; CIJ-7410-2022; FXK-0953-2022
    The most well-known ailment affecting the neck muscles is neck stiffness, caused by sharp changes in temperature, chilling of the muscles by air conditioning or drafts, and consequent painful muscle contractions. A stiff neck is typically characterized by soreness and difficulty in moving the neck especially when trying to turn the head to the side. A stiff neck may also be accompanied by a headache, neck pain, shoulder pain and/or arm pain. Reduced cervical range of motion (ROM) is a common finding in people with neck pain. Musculoskeletal disorders continue to represent a major source of pain and discomfort as well as a significant source of workday loss and workers' compensation costs.In this study, the effects of parameters in air conditioning such as temperature, humidity and air velocity on cervical ROM have been investigated experimentally. In this investigation, each of the three parameters was used as a variable while the others were kept constant in a controlled laboratory room, and the effects of the parameter variations were investigated. Based on the observation that individuals often enter the air conditioned room perspiring in summer conditions, both dry and sweaty conditions were examined. Finally, experimental data were assessed with ANOVA analyses, and cervical rotation was found to be influenced by temperature and air velocity, but not humidity. It was also determined that parameters (temperature, air velocity and humidity) are not effective factors on cervical motion limitation provided that indoor air conditions remain within comfort limits which are prescribed in current standards of ASHRAE Standard 55 - 2004 and ISO 7730.