Browsing by Author "Abid, M."

Now showing 1 - 4 of 4

Citation - WoS: 4
Citation - Scopus: 4
An experimental study of solar thermal system with storage for domestic applications
(Universiti Malaysia Pahang editor.ijame@gmail.com, 2018) Muhammad Abid; Bashria A.A. Yousef; Mamdouh El Haj Assad; A. Hepbasli; Khalid Saeed; Abid, M.; Yousef, B.A.A.; Saeed, K.; Hepbasli, A.; Assad, M.E.
Building sector consumes a greater portion of energy for heating and cooling applications. The utilization of fossil fuels for space and water heating in buildings cause a negative effect on the environment by producing larger CO2. In this study solar thermal water heating system for building application have been analyzed from the first and second law perspectives of thermodynamics considering various scenarios and water consumption pattern. The solar flat collector is very commonly used to extract energy from sunlight. Therefor energy and exergy efficiency curves for the solar flat collector were presented. The energetic and exergetic values for the system were calculated based on the experimental values for the overall system the heat exchanger and the pumps using the approach of exergetic product/fuel basis. The greatest and lowest relative irreversibility’s occurred at the solar collector and the heat exchanger with values of 85.73% and 2.45% respectively and the system overall exergy efficiency was determined to be 20.28%. The energy and exergy efficiencies of the solar collector were analyzed at three different cases depending on the mass flow rates in the solar collector and the secondary circuit of the system. Three different mass flow rates were applied to the inlet of the secondary circuit to observe the efficiency effect on the solar collector circuit. This study can assist in selecting a proper solar collector and storage size for buildings of various capacity and possible improvement in the design of the system components. © 2019 Elsevier B.V. All rights reserved.
Citation - WoS: 22
Citation - Scopus: 22
Dynamic Exergetic Analysis and Evaluation of Photovoltaic Modules
(TAYLOR & FRANCIS INC, 2015) M. Abid; A. Hepbasli; Abid, M.; Hepbasli, A.
Due to the growing demand for renewable energy sources photovoltaic solar has been one of the most promising renewable energy sources in the world. In this article the performance of photovoltaic modules through energy and exergy efficiencies sustainability index improvement potential factors and in terms of their exergy costs is investigated. The thermodynamic variables such as environmental temperature module temperature wind velocity density and humidity of air were considered in the analysis. The investigation helped identify the irreversibilities due to various exergy losses and exergy destructions present in the system for its possible improvements. A case study is presented to show the importance of the efficiency modeling and compare them using the actual operational data of Riyadh Saudi Arabia. It is determined that the energy efficiency varied between 34.09 and 52.14% while the exergy efficiency ranged from 0.16 to 15.23% respectively. The exergy efficiency for the PV/T analysis changed between 1.36 and 19.86% with an average value of 9.65%. The sustainability index was between 1 and 1.17 for the system. The improvement potential factor had minimum and maximum values of 3376 and 24559.42 W respectively while the exergy rate of solar radiation was in the range of 3850.9 and 25115.95 W on the test date. There was obviously a large scope for improvement in the existing system as a very small amount of exergy from solar radiation was utilized.
Dynamic modeling of a refrigeration system with an internal heat exchanger and dual evaporators through exergoeconomic analysis
(Engg Journals Publications, 2016) Muhammad Abid; A. Hepbasli; Khalid Saeed; Abid, M.; Hepbasli, A.; Saeed, Khalid
In this study exergy and exergoeconomic analyses of a refrigeration system with two evaporators and an internal heat exchanger were performed. The analysis of the whole system included various thermodynamics parameters such as sustainability index exergetic improvement potential ratio of the thermodynamic losses(energetic and exergetic losses) to the capital cost relative irreversibility for each component of the system. Furthermore the efficiencies for each component were analyzed using two different approaches one was the net rational efficiency basis and another one was the product/fuel basis. The whole system efficiency on the net rational basis was determined to be 7.24% and on the product/fuel basis it was obtained to be 43.92%. The system has a huge capacity for improvement. The greatest Irreversibility occurs in the compressor with a value of 0.29 kW and the efficiency values for the compressor using both the approaches were found to be 16.9% and 21.57% respectively. © 2016 Elsevier B.V. All rights reserved.
Citation - WoS: 3
Citation - Scopus: 4
Weather Data Analysis of Solar Panels and a Wind Turbine from an Exergetic Point of View Based on Experimental Values over One Year
(Bellwether Publishing Ltd., 2015) Muhammad Abid; A. Hepbasli; Abid, M.; Hepbasli, A.
In this article the weather data of solar modules and a wind turbine in the Riyadh region Saudi Arabia were analyzed. In the analysis experimental values obtained from the system operation over 12 representative days of each month in the period of January to December 2011 were utilized. The wind turbine and the solar panels considered for the assessment are subparts of a hybrid wind-PV system with hydrogen storage installed at the Sustainable Energy Technology (SET) Center Mechanical Engineering Department King Saud University Riyadh Saudi Arabia. Various parameters such as global irradiance exergy of solar radiation exergy losses and exergy efficiency of solar modules and velocity of wind were analyzed and compared at the location. Among the selected days the maximum average value of the solar irradiance was 631.49 Wm-2 on July 7 and the corresponding average exergy rate value of the solar radiation was 583.82 Wm-2 with a conversion efficiency of 4.38% while the absolute exergy losses was calculated to be 95.61%. The minimum average value of the irradiance and the exergy of solar radiation were measured and calculated to be 350.45 and 326.56 Wm-2 respectively with an exergy efficiency of 8.42% on a cloudy day in May 2011. It was calculated through the wind data analysis that the maximum average wind power density available on November 1 2011 was 807.51 Wm-2 while the maximum average energy available to the wind turbine for the conversion into the useful output of the inverter was 53855.74 Wh. It was also determined that the minimum value of the power density was 22.24 Wm-2 on January 3 2011 and the corresponding maximum energy available to the turbine for conversion was 1483.22 Wh. It is expected that the data analysis will be very helpful for the future solar energy utilization and developing exergy wind maps for the region to make an efficient use of these renewable energy sources. © 2021 Elsevier B.V. All rights reserved.