Energy and Exergy Analysis of a Thermally Dried Galvanized Roofing Sheets Production Process.

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dc.contributor.authorOhijeagbon, I. O.,
dc.contributor.authorIbrahim, H. K.,
dc.contributor.authorAdewuyi, O. A.
dc.contributor.authorFayomi, A. A.
dc.date.accessioned2021-10-12T10:39:10Z
dc.date.available2021-10-12T10:39:10Z
dc.date.issued2020-02-01
dc.description.abstractEnergy and exergy analysis of a thermally dried galvanized roofing sheets production plant was investigated. Data related to the operating units of the plant were analysed and used for the parametric analysis of the energy and exergy performance of the plant. The highest energy efficiency experienced in the pre- curing operation was in the pre-mixing and mixing operating units with a value of 90.91% each. The energy efficiency in the boiler and autoclave units of the curing operations were found to be 78.02 and 82.04% respectively. The boiler had a higher exergy efficiency of 58.31% compared to the autoclave with an exergy efficiency of 19.06%. The parametric analysis of the autoclave shows that the energy efficiency and exergy destruction both increased from 75.33 to 84.71% and from 54.72 to 95.70% as the exit temperature reduced from 100 to 30oC, while the exergy efficiency reduced from 45.28 to 4.30% within the same exit temperature range. The overall energy and exergy efficiencies of the plant were obtained as 80.03% and 42.13%. The method provides an approach to mitigate operational losses and enhance efficient utilization of energy of thermally dried galvanized roofing sheets production plants and similar industrial processes.en_US
dc.description.sponsorshipDr. I. O. Ohijeagbonen_US
dc.identifier.citationOhijeagbon, I. O., Ibrahim, H. K., Adewuyi, O. A. & Fayomi, A. A. (2020): Energy and Exergy Analysis of a Thermally Dried Galvanized Roofing Sheets Production Process. ANNALS of Faculty Engineering Hunedoara – International Journal of Engineering. Fersicule 2, Tome XVII; 13-22.en_US
dc.identifier.urihttp://annals.fih.upt.ro/ANNALS-2020-2.html
dc.identifier.urihttps://uilspace.unilorin.edu.ng/handle/20.500.12484/6567
dc.language.isoenen_US
dc.publisherPublished by University Politehnica Timisoara, Faculty of Engineering Hunedoara , 5, Revolutiei, 331128, Hunedoara, Romania.en_US
dc.relation.ispartofseriesFersicule 2, Tome XVII;13-22
dc.subjectProduction planten_US
dc.subjectgalvanized roofing sheetsen_US
dc.subjectthermally drieden_US
dc.subjectenergyen_US
dc.subjectexergy performanceen_US
dc.titleEnergy and Exergy Analysis of a Thermally Dried Galvanized Roofing Sheets Production Process.en_US
dc.typeArticleen_US

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The study investigated the energy and exergy analysis of a thermally dried galvanized roofing sheets production processing plant. An energy management and data communication process was adopted for the purpose of data acquisition. Data related to operating units of the plant, such as operation time, input and output power, inlet and exit temperatures, operating steam capacity and firing rate of boiler were collected and analyzed. Analyzed data were used for evaluating the parametric energy and exergy analysis of the galvanized roofing sheets production processes. The result revealed that the pre-curing operations had input power ranging between 4.40-20 kW and was equivalent to 3.96-864.00 MJ of electrical energy. The curing operations had input power of 6076.21 kW in both the boiler and autoclave and was derived from a thermal energy source. The highest input and output electrical energy of 864.00 and 691.20 MJ was obtained in the piling unit as a result of the highest values of input and output power of 30.00 and 24.00 kW, and the operation time of 8 hours in contrast to operating time of between 0.12-2.00 hours of other operating units in the pre-curing stage. The highest energy efficiency experienced in the pre-curing operation was in the pre-mixing and mixing operating units with a value of 90.91%, while the energy efficiency in the boiler and autoclave units of the curing operations were obtained as 78.02 and 82.04% respectively. Moreover, the values of the exergy input and output in the pre-curing operations were equivalent to the respective energy inputs and outputs of each operating unit. As a result, the exergy efficiencies were equal to the energy efficiencies in the pre-curing operations. On the other hand, the exegy input of the boiler and autoclave in the curing operation were obtained as 68,644.13 and 51,302.11 MJ, while the exergy output were determined as 40024.73 and 9776.18 MJ respectively. Furthermore, the boiler had a higher exergy efficiency of 58.31% compared to the autoclave with an exergy efficiency of 19.06%. Consequently, the highest exergy destruction of 80.94% was obtained in the autoclave followed by the reservoir and the boiler with an exergy destruction of 54.55 and 41.69 % respectively. The parametric analysis of the autoclave show that exergy destruction increased significantly from 54.72 to 95.70% as the exit temperature reduced from 100 to 30oC, as exergy efficiency reduced from 45.28 to 4.30% within the same exit temperature range. The energy efficiency of the autoclave only increased slightly from 75.33 to 84.71% with reduction in exit temperature. Also, increasing exergy efficiency of the plant as the exergy destruction of the autoclave unit reduces resulted in reduction in the exergy destruction of the plant from 58.06 to 36.82%. The overall energy and exergy efficiency and exergy destruction of investigated plant are 80.03%, 42.13% and 57.87% respectively.
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