https://hdl.handle.net/10419/187802 2026-09-22T21:38:10Z 2026-09-22T21:38:10Z Natanee Vorayos Nat Vorayos Tassawan Jaitiang https://hdl.handle.net/10419/243917 2023-11-10T02:13:41Z 2020-01-01T00:00:00Z

Title: Energy-environmental performance of Thai's cement industry Authors: Natanee Vorayos; Nat Vorayos; Tassawan Jaitiang Abstract: One of the most important mechanisms to improve the sustainability of each country are monitoring the performance of the industries not only in the energy perspective but also the environmental point of view and setting the improvement goal. This study presents an indicator that can reflect both of energy consumption and greenhouse gas emission simultaneously called energy-environmental performance index. The cement industry is selected as the case study due to its important role in Thai's economic system and because it has high energy and greenhouse gas intensities. The performance of the sector during 2010-2016 are evaluated from the statistical data of volume produced, gross outputs in monetary value, energy consumption, raw material-to-clinker ratio, clinker-to-cement ratio and composition of clinker. The result shows that the energy-environmental performance index under the current situation of cement sector is 0.70. This is the average performance for the sector-level and can be used as the benchmarking for the company in the same industry. Since all data required for the calculation are the basic data for most companies, it means that the company can estimate its performance at the company level as well. Besides, this study also uses the statistical data and results in 2010-2016 to forecast the baseline performance in 2025 and then uses the baseline performance including target from the energy conservation plan and greenhouse gas mitigation plan to estimate the performance target. It could be found that the energy-environmental performance target of cement industry in 2025 is 0.75.

2020-01-01T00:00:00Z Sorte, S. Ribeiro, J. P. Coutinho, J. A. P. Nunes, M. I. https://hdl.handle.net/10419/243818 2023-11-10T02:13:56Z 2020-01-01T00:00:00Z

Title: Study of fame production from waste cooking oil: Opperation in batch and continuous regime with regeneration of enzyme catalyst Authors: Sorte, S.; Ribeiro, J. P.; Coutinho, J. A. P.; Nunes, M. I. Abstract: This work aimed to: (i) assess the performance of Novozyme® 435 for FAME production from waste cooking oil (WCO) under different oil acid values and enzyme-to-oil ratios; (ii) test different regeneration methods and assess the regenerated enzyme's performance; and (iii) determine FAME yield in continuous operation regime. Oil acid values up to 104 mg KOH.g-1 and enzyme-to-WCO ratios of up to 20:80 (% wt.) were studied, with maximum yield recorded for increasing acid values and enzyme-to-WCO ratio. FAME production from WCO yield ranging 50%-80% was recorded for 5 consecutive production cycles (8h each, in batch regime) with no regeneration of the enzyme. Among the enzyme regeneration methods tested, the highest FAME yield was recorded using t-butanol washing followed by enzyme incubation in the WCO before reusing it. Operation in continuous regime, including enzyme regeneration, produced the highest FAME yield (maximum of 86 %). Thus, effectiveness of the regenerating process and efficiency of continuous production of FAME from WCO (up to 576h) were observed.

2020-01-01T00:00:00Z Babarinde, T. O Akinlabi, S. A Madyira, D. M https://hdl.handle.net/10419/243945 2023-11-12T02:06:40Z 2020-01-01T00:00:00Z

Title: Energy performance evaluation of R600a/MWCNT-nanolubricant as a drop-in replacement for R134a in household refrigerator system Authors: Babarinde, T. O; Akinlabi, S. A; Madyira, D. M Abstract: Vapour compression refrigerator systems working with R134a are associated with high energy demand and environmental problems and refrigerator consumers' prioritise energy consumption in choosing their choice of refrigerator systems. Therefore, this research work investigated R600a in MWCNT-nanolubricant (0.4 g/L and 0.6 g/L) as a drop in replacement for R134a refrigerant in a household refrigerator system with varied mass charge of R600a (50, 60 and 70 g). The refrigerator was instrumented at the inlet and outlet of the refrigerator compressor, condenser, expansion valve and evaporator. Two bourdon type pressure gauges were connected to the compressor inlet and outlet of the system. The results were taken and evaluated and compared with the result obtained through R134a refrigerant in the system. The result showed that R600a perform better in terms of COP, power consumption and cooling capacity compared to R134a in the system with lower evaporator temperature of -11°C and power consumption of 0.0639 kW and highest COP in the system. Therefore, R6000a/MWCNT- nanolubricant can serve as a drop in replacement for R134a in the household refrigerator.

2020-01-01T00:00:00Z Maftuchah Zainudin, Agus Ikhwan, Ali Winaya, Aris Purnama, Adi Sudarmo, Hadi https://hdl.handle.net/10419/243843 2023-11-12T02:08:15Z 2020-01-01T00:00:00Z

Title: The potential of physic nut (Jatropha curcas Linn.) hybrid plant as a source of biodiesel at different planting location for dry land utilization Authors: Maftuchah; Zainudin, Agus; Ikhwan, Ali; Winaya, Aris; Purnama, Adi; Sudarmo, Hadi Abstract: Physic nut (Jatropha curcas Linn.) is the one of prospective plants to be developed as biodiesel source in the tropical region. Hence, it is very important to expand the cultivation area of this plant. The purpose of this research was examined the crossed results of four genotypes of physic nut plant that potential to be developed as the promising genotypes for dry land area, namely JCUMM-5, JCUMM-6, JCUMM-7, and JCUMM18. The potential production of the four genotypes plant of J. curcas were selected for five years planting at two different locations which represent the dry land area, i.e., Pasuruan Regency of East Java, and North Lombok Regency of West Nusa Tenggara, Indonesia. The observations on the number of fruit bunches, fruits number, seeds dry weight, 100 seeds dry weight and seed oil content showed that JCUMM5, JCUMM7, and JCUMM18 were not significantly different (P>0.05) and the seeds production in kilogram of dry weight/ha/year higher than IP3A and IP3P as a control genotypes. Whereas the JCUMM18 genotype was the highest average on seeds dry weight (328.5 kg/ha/year) and North Lombok, West Nusa Tenggara location was higher on a number of fruit bunches, fruits number and 100 seeds dry weight than those in Pasuruan, East Java. However, the seed oil content from North Lombok was lower than in Pasuruan location.

2020-01-01T00:00:00Z