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Experimental Study of Sunearth Flat Plate Solar Collector
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Abstract:In this paper, results are presented for the testing of a flat plate solar thermal collector. A wealth of technical data regarding the SUNEARTH vendor name brand of flat plate solar collectors is presented to provide references for Solar Engineers. The thermal performance curve is used to determine the air-collector heat removal factor of the device, which is then compared with the manufacturer’s data. The diurnal system efficiency characteristics of this device are also presented herein. These results afford a pragmatic baseline for other researchers seeking to benchmark the performance of their solar collectors.
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Author:K. R. Anderson, S. Hill, C. Selerberg, E. Guiterez
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Abstract | References Full Paper: PDF
(Size:1422KB), pp.31-37,
Pub. Date:
2014-
02-28, DownLoad:
2369
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Erythrosine B Dye Based Polymethylmethacrylate-Silica Films for Luminescent Solar Collector Applications
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Abstract:Luminescent solar concentrator samples using PMMA / SiO2 composites as the matrix with Erythrosine B are prepared. Three films of PMMA/ silica composition ration (70:30) %, (50:50) % and (30:70) % are prepared. The photostability of Erythrosine B doped PMMA/SiO2 composites is examined through four weeks exposure to sunlight. The obtained results show that the stability of collector increases with the increasing silica content. Moreover, the transition energy for electrons are direct allowed transition for all examined samples and the value of optical gap energy (Eg) increases with the increasing the silica content. However, the tail width of localized states in the band gap (Eu) decreases with the increasing exposure time due to the degradation of the dye. Emission spectra and quantum efficiency are also investigated. Erythrosine B is shown to have a higher fluorescence quantum yield in (30:70) % matrix. Collectively, these results suggest that PMMA/SiO2 composites provide the better system for use in fluorescent solar collector systems.
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Author:S. M. Reda
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Abstract | References Full Paper: PDF
(Size:538KB), pp.12-22,
Pub. Date:
2014-
02-28, DownLoad:
1452
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Boiler Flue Gases as Secondary Source in Polyester Production
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Abstract:Energy efficiency improvement in polyester production by applying boiler flue gases heat recovery was investigated. This study presented increasing process efficiency and at the same time the thermal pollution reduced. The implementation of the economizer for feed water preheating with heat contained in the exhaust flue gases reduced natural gas consumption by 9.2 % and also flue gases exhaust temperature diminished from 204 0C to 51.8 0C. When an air preheater using for combustion air preheating was applied, the natural gas savings became 7%. Simultaneously, the air pollution was also lowered and the outlet flue gases temperature diminished from 204 0C to 64.40C. The utilization of the economizer and the air preheater resulted in a maximum fuel saving of 10.15% and a minimum thermal pollution with flue gases exhaust temperature of 31.150C.
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Author:A. Mihelic-Bogdanic, R. Budin
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Abstract | References Full Paper: PDF
(Size:147KB), pp.83-88,
Pub. Date:
2014-
04-17, DownLoad:
1259
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Exergoeconomic Analysis of a Power Plant in Abu Dhabi (UAE)
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Abstract:Following a previous exergy analysis of a power plant in Abu Dhabi (UAE), a detailed exergoeconomic analysis of the plant based on Specific Exergy Costing (SPECO) method is presented in this investigation. The objective of this applied research is to compare the values of the different exergoeconomic variables of the Open Cycle Gas Turbine (OCGT) calculated during summer atmospheric conditions to the values obtained from the simulation of the plant using design conditions. The results show that summer conditions have increased the total exergy destruction of the power plant and its cost rate respectively by 1.95% and 10%. The negative effects of summer atmospheric conditions on the cost of exergy destruction in the combustion chamber and the compressor are compensated by their positive effects on the turbine. In order to minimize the effects of the summer atmospheric conditions on the performance of the power plant, it is recommended to add a cooling system before the compression of air and a process control system based on the analysis of carbon monoxide, and oxygen of the exhaust gas leaving the combustion chamber.
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Author:Ahmed Nabil Al Ansi, Mubarak Salem Ballaith, Hassan Ali Al Kaabi, Zin Eddine Dadach
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Abstract | References Full Paper: PDF
(Size:463KB), pp.185-192,
Pub. Date:
2015-
12-20, DownLoad:
899
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Real Temperature Distribution on the Surface of Underfloor Heating
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Abstract:The article presents the possibilities of developing the heat transfer area of supply pipes in underfloor heating. It examines the influence of ribs shape and the distance between them on the distribution of temperatures on the surface of heating plates depending on the variable temperature of the heating factor. Numerical analyses were conducted for the predetermined steady states and based on the finite element method.
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Author:Henryk G. Sabiniak, Karolina Wi?nik
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Abstract | References Full Paper: PDF
(Size:351KB), pp.137-151,
Pub. Date:
2015-
10-09, DownLoad:
697
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Effect of summer weather conditions on the environmental impact of a power plant in the UAE
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Abstract:This work investigates the effect of summer weather conditions on the environmental impact of an Open Cycle Gas Turbine in Abu Dhabi (UAE) using an exergoenvironmental analysis. The results are used to suggest measures for reducing the calculated impact. Actual operational data are verified with simulation data using commercial software. Compared to standard weather conditions, the summer weather conditions decrease the overall exergetic efficiency of the plant by 4.3% and increase the total environmental impact per generated KWh by 7.9%. The addition of a heat recovery steam generator could increase the net power output and decrease the total environmental impact of the plant. The main contributor to the environmental impact of exergy destruction is the combustor. Summer conditions increase this impact by 21.5%. The compressor has the second highest environmental impact, increased by 14.6% for summer conditions. A process control system for continuous measurement of exhausted O2 and CO can help to reduce the excess air and, consequently, the associated environmental impact. This may also decrease the power required by the compressor. Lastly, a cooling system for the ambient air may also help to increase the power output of the plant by decreasing the power required by the compressor.
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Author:Mohamed Mohamed Alhammadi, Mubarak Haji Alblooshi, Zin Eddine Dadach, Fontina Petrakopoulou
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Abstract | References Full Paper: PDF
(Size:596KB), pp.1-13,
Pub. Date:
2017-
01-01, DownLoad:
110
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