Papers by Wisam Al-Shohani
Solar Energy
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International Journal of Heat and Technology
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Fluids
In this article, the influence of splitting a local underfloor air distribution system (UFAD) on ... more In this article, the influence of splitting a local underfloor air distribution system (UFAD) on indoor thermal comfort for three occupants was studied numerically. A validated computational fluid dynamics (CFD) model was employed in this investigation. The proposed heating system was evaluated and analyzed for different values of air temperature and supply velocity. Providing suitable thermal comfort and saving energy are considered the main evaluation indexes for this study. Three cases, cases 2, 3, and 4, of the proposed local UFAD system were compared with a traditional heating system case, case 1. The supplying air velocity and air temperature in the reference case were 0.5 m/s and 29 °C, while in cases 2, 3, and 4, they were 0.4 m/s and 29 °C, 28 °C, and 27 °C, respectively. The results show that acceptable indoor human thermal comfort and energy demand reduction were achieved by using the splitting UFAD concept.
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Journal of Engineering Research
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Energies
As conventional energy sources decrease and worldwide power demand grows, the appeal of photovolt... more As conventional energy sources decrease and worldwide power demand grows, the appeal of photovoltaic (PV) systems as sustainable and ecofriendly energy sources has grown. PV system installation is influenced by geographical location, orientation, and inclination angle. Despite its success, weather conditions such as dust substantially influences PV module performance. This study provides a comprehensive review of the existing literature on the impact of dust characteristics on PV systems from three distinct perspectives. Firstly, the study looks at the dust properties in different categories: optical, thermal, physical, and chemical, highlighting their significant impact on the performance of PV systems. Secondly, the research reviews various approaches and equipment used to evaluate dust’s impact on PV, emphasizing the need for reliable instruments to measure its effects accurately. Finally, the study looks at modeling and predicting the influence of dust on PV systems, considering...
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Applied Solar Energy, Aug 1, 2022
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Journal of Thermal Engineering, 2020
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International Journal of Applied Science and Engineering, 2021
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International Journal of Renewable Energy Research, 2019
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2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA), 2016
This paper presents a novel optical simulation of a design of the V-trough concentrator used with... more This paper presents a novel optical simulation of a design of the V-trough concentrator used with photovoltaic modules by ray-tracing method. The V-trough concentrator is two flat reflectors fixed on the photovoltaic module as a V latter in order to increase the income solar radiation to the photovoltaic. The advantages of using the V-trough is increasing of the income solar radiation to the photovoltaic which leads to increasing in the current output of the photovoltaic as well as the overall power output for the same size of the photovoltaic. The main aim of this paper is to utilize advanced ray tracing simulation to predict the concentration coefficient of a V-trough concentrator and compare the simulation results with the published experimental results. The results show that the difference between the simulation and experimental results is 1.99% indicating good agreement between the simulation and the experimental work.
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New Concentrated Optical Water Filter (COWF) for Photovoltaic (PV) applications is investigated. ... more New Concentrated Optical Water Filter (COWF) for Photovoltaic (PV) applications is investigated. The COWF is placed in front of the PV module in order to reduce the thermal load on the PV. The COWF acts as a spectrum splitter to absorb the unwanted radiation and convert it to heat, and allow the useful radiation to reach the PV. The COWF consists of two parts; Optical Water Filter (OWF) and V-trough Solar Concentrator (VTSC). The OWF consists of two glass panels with specific gab filled with water which flows carrying away the heat and preventing it from reaching the PV. However, the disadvantage of using the OWF with PV is some reduction in the electrical power output of the PV due to optical losses. Therefore, VTSCs are developed to be integrated with OWF to overcome the optical losses. The VTSC consists of two reflectors placed as a (V) letter in front of the OWF in order to increase the solar radiation received by the PV to overcome the optical losses by the OWF. Overall, it can...
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This paper presents a numerical analysis of using a water layer as an optical solar spectrum spli... more This paper presents a numerical analysis of using a water layer as an optical solar spectrum splitter for concentrated and non-concentrated Photovoltaic/Thermal systems (CPVT and PVT) based on ray-tracing technique using OPTISWORKS software. In the proposed approach, the water is to be circulated above the PV module to extract the heat from PV module and to act as a spectrum splitter to the solar radiation. This effect of different water layer thicknesses (2.5 – 30 mm) on the radiation received by the PV cell and the radiation absorbed by the water layer was investigated. Results showed that the optical filter has low transmittance of UV radiation and hence good absorption efficiency (over 99%). The filter transmittance of IR radiation decreased with the increase in water layer thickness to reach 50%. Also, for VIS radiation, as the water layer increases, the transmittance of VIS radiation decreases from 92% with water layer of 2.5 mm to 50% with water layer of 30 mm thickness. Additionally, the overall radiation output of the optical filter is presented showing optical efficiency of 74.5% but this radiation considers mainly of VIS lights beneficial to the PV.
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IOP Conference Series: Materials Science and Engineering, 2020
The aim of this paper is to enhance the local comfortable zone for the occupants in a small offic... more The aim of this paper is to enhance the local comfortable zone for the occupants in a small office room. The ceiling spot ventilation (CSV) system and the wall spot ventilation (WSV) system are proposed and investigated numerically to show the influence of these systems on the local thermal comfort and energy demand. Three different amounts of airflow rate are used in this investigation. A CFD model is employed to explain the behavior of indoor airflow and temperature distribution in each case study. The results show that, when using these systems as a main ventilation system will reduced the demand on fresh air and this will reduce the required load on cooling coil and saving more energy. Also, the results revealed that the wall spot ventilation (WSV) was provided a required local indoor thermal environment air for the occupant zone. Therefore, using this system will provide a comfortable local environment and enhance the air velocity distribution as well as saving more energy.
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2016 International Conference for Students on Applied Engineering (ISCAE), 2016
This work presents a novel adsorption system for producing ice and potable water using fresh and ... more This work presents a novel adsorption system for producing ice and potable water using fresh and saline water as refrigerants and Metal Organic Framework material (CPO-27Ni) as adsorbent. In this work, an advanced technique of adsorption ice making integrated with vacuum direct freeze desalination is developed. The effect of fresh water specific volume in the evaporator and the performance of this system in terms of coefficient of performance (COP), specific daily production of ice (SDIP), slurry mixture (SDSP) and fresh water (SDWP) were experimentally investigated. The optimum COP was up to 0.205 whereas 10.5, 29.5 and 1.32 ton/day/ton of adsorbent for SDIP, SDSP and SDWP, respectively. The results are obtained at generation temperature of 95°C, antifreeze temperature of -1°C and fresh water of 450ml.
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Applied Mechanics and Materials, 2011
A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is di... more A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is directly converted to thermal energy used to heat the water. The wind energy is converted to frictional thermal energy by dissipation within a thin layer of oil. The oil is filled in an annular gap confined between two horizontal concentric cylinders with different diameters; the outer insulating cylinder is rotating while the inner cylinder is fixed. The heat generated is transferred into the inner cylinder then to the heat exchanger. The heat transfer fluid is carrying the heat from the heat exchanger to the water storage tank by mechanical pump. A mathematical model is proposed to model the system mechanical and thermal behavior. The theoretical model has been solved analytically to estimate the amount of thermal energy generated by the system based on a given wind design speed at the site. The theoretical performance of the proposed heater is analyzed and the effects of different desig...
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Arabian Journal for Science and Engineering, 2012
ABSTRACT This paper presents the energy output of photovoltaic (PV) module for three sites in Ira... more ABSTRACT This paper presents the energy output of photovoltaic (PV) module for three sites in Iraq, these three sites are Mosul (latitude 43°N and longitude 36°E) in the northern Iraq, Baghdad (latitude 33°N and longitude 45°E) in the central Iraq, and Al-Hammar lagoon (latitude 30°N and longitude 46°E) in southern Iraq. The paper analyses the solar radiation data and ambient temperature to compare the PV energy output at these sites. In addition, the environmental aspects are investigated. The analysis showed that the Al-Hammar lagoon is the best location for PV energy production with respect to other locations. It is found that the annual energy production, and reduction of annual greenhouse gases for a module with 215 W capacity are 534 kWh and 0.8 kg of SO2, 0.27 kg of NOx , 324 kg of CO2, respectively.
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Solar Energy, 2016
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Applied Thermal Engineering, 2016
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Energy Conversion and Management, 2016
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This paper presents the energy output of photovoltaic
(PV) module for three sites in Iraq; these ... more This paper presents the energy output of photovoltaic
(PV) module for three sites in Iraq; these three sites
are Mosul (latitude 43◦N and longitude 36◦E) in the northern
Iraq, Baghdad (latitude 33◦N and longitude 45◦E) in the
central Iraq, and Al-Hammar lagoon (latitude 30◦N and longitude
46◦E) in southern Iraq. The paper analyses the solar
radiation data and ambient temperature to compare the PV
energy output at these sites. In addition, the environmental
aspects are investigated. The analysis showed that the
Al-Hammar lagoon is the best location for PV energy production
with respect to other locations. It is found that the
annual energy production, and reduction of annual greenhouse
gases for a module with 215Wcapacity are 534 kWh
and 0.8 kg of SO2, 0.27 kg of NOx , 324 kg of CO2, respectively.
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Papers by Wisam Al-Shohani
(PV) module for three sites in Iraq; these three sites
are Mosul (latitude 43◦N and longitude 36◦E) in the northern
Iraq, Baghdad (latitude 33◦N and longitude 45◦E) in the
central Iraq, and Al-Hammar lagoon (latitude 30◦N and longitude
46◦E) in southern Iraq. The paper analyses the solar
radiation data and ambient temperature to compare the PV
energy output at these sites. In addition, the environmental
aspects are investigated. The analysis showed that the
Al-Hammar lagoon is the best location for PV energy production
with respect to other locations. It is found that the
annual energy production, and reduction of annual greenhouse
gases for a module with 215Wcapacity are 534 kWh
and 0.8 kg of SO2, 0.27 kg of NOx , 324 kg of CO2, respectively.
(PV) module for three sites in Iraq; these three sites
are Mosul (latitude 43◦N and longitude 36◦E) in the northern
Iraq, Baghdad (latitude 33◦N and longitude 45◦E) in the
central Iraq, and Al-Hammar lagoon (latitude 30◦N and longitude
46◦E) in southern Iraq. The paper analyses the solar
radiation data and ambient temperature to compare the PV
energy output at these sites. In addition, the environmental
aspects are investigated. The analysis showed that the
Al-Hammar lagoon is the best location for PV energy production
with respect to other locations. It is found that the
annual energy production, and reduction of annual greenhouse
gases for a module with 215Wcapacity are 534 kWh
and 0.8 kg of SO2, 0.27 kg of NOx , 324 kg of CO2, respectively.