Srinakharinwirot University Engineering Journal

Potential of Ethanol and Biogas Production from Oil Palm Frond Juice and Oil Palm Trunk Juice

2023-07-14T20:23:51+07:00

This research aimed to study the potential of ethanol and biogas production from oil palm frond juice (OPFJ) and oil palm trunk juice (OPTJ) performed using S. cerevisiae for alternative energy. The amount of glucose consumed quickly to produce ethanol in 48 hrs. The amount of glucose in OPFJ decreased from 31.26 to 5.09 g/l, and OPTJ decreased from 58.65 to 4.95 g/l. The amount of glucose consumed to produce ethanol until steady-state at 96 hours of fermentation processes. The highest ethanol yield from OPTJ and OPFJ was 31.28 and 11.50 g/l, respectively. The calculation of ethanol yield found that the ethanol yield from OPTJ was higher than that of OPFJ. The ethanol yield of OPTJ was 0.48. g-ethanol/g-glucose, while OPFJ was only 0.39 g-ethanol /g-glucose due to fermentation efficiency. The fermentation efficiency of OPTJ was as high as 93.42%, while the fermentation efficiency of OPFJ was only 72.14%. Biogas production from distillery slop of OPFJ and OPTJ used the biochemical methane potential (BMP) technique. The maximum accumulated methane production of OPFJ and OPTJ were 997 and 1,068 ml at 71.53 and 71.18% of methane composition, which were very similar. Corresponding to methane yield (Yield) was equal to 314 and 336 ml CH₄/g VS. The experimental results showed that OPFJ and OPTJ of distillery slop have the potential to be used as raw materials for biogas production. Three Genera of archaea dominant founding were Methanobacterium sp., Methanofollis sp., and Methanosaeta sp.

Study on the Effect of Refrigerator with Phase Change Material

2024-01-08T11:25:32+07:00

This research studies the effects of using phase change material in the cooling system of a 105 L single door refrigerator. Installed the phase change material together with the cooling pipe instead of the original evaporator position, with melting temperature of -15 ℃. This was a load pull-down test with a final temperature of 6 ℃ and an average initial temperature of 35 ℃, the comparison with and without phase change material. Consider the average of the pull-down time of the load temperature, the temperature in cabinet of refrigerator, the compressor run time, and the energy consumption. The results of the experiment found that the refrigerator with phase change material had a time to pull-down the load temperature of more than 3 minutes, accounting for 0.61 %, the increase is only slight and has no effect on the cooling system. The pull-down time of temperature in cabinet reduce up to 94 minutes, is 33.09 %. The compressor operating time decreased by 88 minutes is 25.00 % and reduced energy consumption by 11.930 W is 17.77 %. When comparison without phase change material had a time to pull- down the load temperature of 485 minutes, the pull- down time of temperature in cabinet of 284 minutes, there was a compressor operating time of 352 minutes, and energy consumption by 67.131 W. The results indicate that the use of phase change materials has a positive impact on the cooling system.

Conversion of Natural Rubber Product to Bio-Crude Oil By Hydrothermal Liquefaction Process

2024-04-17T20:48:57+07:00

This research investigates the conversion yield of natural rubber product such as raw rubber sheets, cup lumps, and Para rubber latex to bio-crude oil by hydrothermal liquefaction process. The reaction temperatures are in the ranges of 350 °C and 375 °C. The materials are dissolved in water at H₂O/NR mass ratios of 2:1, 3:1, and 4:1. The reaction time was 60 minutes. Results show that the highest yields of bio-crude oil is 71.40% by using raw rubber sheets as raw material, while the bio-crude oil yield from using cup lumps, and Para rubber latex are 70.03% and 22.47% respectively. The Fourier Transform Infrared Spectrometer (FT-IR) analysis shows peak absorbance at 2,920 cm^–1, indicating the intensity of the absorbance of the alkane functional group (C-H) which indicates fuel oil property. This study shows the technical possibility of producing bio-crude oil from natural rubber in Thailand by-using the hydrothermal liquefaction process. This might be the alternative energy in the future and support the beneficial of using Para rubber as well.

Machine learning for Customer Behavior Prediction on Banking Product

2022-10-20T12:43:48+07:00

This article aims to study the parameters for customer to make decision in bank product via telemarketing and to apply machine learning for customer behavior model of banking product. The technique in this study is the Cross-Industry Standard Process. There are 6 processes that are business understanding, data understanding, data preparation, model development, evaluation, and deployment. The data consisted of 41,188 customers and 20 parameters. To do the data preparation, feature selection i.e., data transfer, data reduction, data cleaning using Knime a tool. There are 3 algorithms for customer behavior model of banking product that are Decision tree, Random Forest and Tree ensemble. Algorithm performance testing by using accuracy, sensitivity, and specificity for the best algorithm. The results can demonstrate that the top three parameters impacting decision making are the length of time spent talking on the phone with customers, the number of days elapsed since the customer was last contacted from a previous campaign, and the results of previous marketing campaigns. The most accuracy algorithm for customer behavior prediction in bank product is Tree ensemble with accuracy 90.94% comparing with Decision tree and Random Forest tree with accuracy 87.54% and 90.29%, respectively. To do the data visualization using Power BI that is very beneficial for planning and leads to higher sales. On-going research, to apply this methodology with bank product marketing in Thailand.

Bioactive Paper Coated with Green Synthesized Silver/iron Oxide for Food Packaging

2024-04-21T16:43:17+07:00

Utilization of antibacterial packaging is an approach to maintain and extend shelf-life of foods. This research aims to develop the bioactive composite paper coating with bioactive compound viz, silver-iron oxide particles (Ag/Fe₃O₄). Starch waste from cassava starch industry and tannic acid are used as bio reducing agents for synthesis of Ag/Fe₃O₄. The effect of tannic acid concentration at 0-3 %w/v is studied. Based on the study, the increase of tannic acid concentration for coating of paper enhances tensile strength, water resistance and antibacterial activities i.e. Staphylococcus aureus: S.aureus and Escherichia coli: E.coli. The coated paper with Ag/Fe₃O₄ at 3% w/v of tannic acid could maintain vitamin C and delay the ripening of tomatoes. Therefore, the obtained packaging had potential to apply as bioactive packaging to maintain food quality and prolong the shelf-life.

The Study of Thermal Efficiency of hot-pot

2024-01-25T12:50:23+07:00

This study is a thermal study of a hot pot, a household equipment for cooking and widely used for a long time. This research study used a size 22 hot pot with 3 different shapes and sizes of air flow that can be commonly seen. Experiments were conducted using the Water Boiling Test (WBT) method, using solid alcohol as fuel. It was found that type 1 hot pot has an overall air flow cross-sectional area of 36.41 cm² with maximum average thermal efficiency of 40.22%, type 2 hot pot has an overall air flow cross-sectional area of 27.43 cm² with maximum average thermal efficiency of 35.28% and type 3 hot pot has an overall air flow cross-sectional area of 35.61 cm² with maximum average thermal efficiency of 30.50%, respectively. This research study shows that the different shapes and sizes of the air flow cross-sectional area are factors that cause significant differences in thermal efficiency.

Production Potential of RDF -5 Fuel from Municipal Solid Waste Mixed with Natural Rubber in Satun Global Geopark

2023-07-12T11:57:25+07:00

Satun Province is a small province with world-famous tourist attractions such as Koh Lipe. The number of tourists is about 1.04 million people/year. On April 17, 2018, it was certified as Thailand's first global geopark. Almost all of the waste in the World Geopark area is disposed of at the Integrated Waste Management Center, Kamphaeng Subdistrict, La-Ngu District, Satun Province. Currently, there are more than 100,000 tons of residual waste from the community in the center. This research investigated the optimal ratio of community waste to rubber for the production of RDF-5 fuel. The ratio of community waste to natural rubber was studied at the ratio of 100:0, 95:5, 90:10, 75:25, and 50:50, respectively. The results showed that the calorific value was increased in the ratio (%) of the added natural rubber (concentrated latex) and the heat value of the fuel is directly in ratio to the amount of natural rubber added. The ratio with the highest calorific value was 50:50, followed by 75:25 and 95:5. The calorific value was 41.63 MJ/kg, 41.54 MJ/kg, and 40.75 MJ/kg, respectively. Compared with 100:0 have a calorific value of 40.69 MJ/kg only. Adding natural rubber to RDF-5 fuels will increase the ignition time of the produced RDF-5 fuels and produce higher calorific values and cover the standards required by the industry, which had a synergism significantly.

An FIS-Integrated Multi-Objective Goal Programming Model for Cobot Assignment Problem

2024-07-19T14:53:04+07:00

Due to facing multiple factors in the cobot assignment problem, considering only a single one as in the traditional assignment method cannot guarantee the optimal solution. This research then proposed a multi-objective goal programming model for solving this problem with the consideration of relationships between workers, cobots, and tasks. The Fuzzy Inference System (FIS) was integrated to analyze the performance and preference of the assignment based on 24 criteria. The comparison results demonstrated that the proposed method obtained the overall performance and preference values that overcome the conventional assignment method considering only cobot functions.

Development of Transportation Notification and On line Report : a case study of Tharathong Metal Co ., Ltd

2024-04-17T20:51:45+07:00

The objective of this research is to design and develop an online transportation notification and reporting system. This will be achieved by studying and collecting current operational data to create a current workflow diagram, analyzing the root causes of problems to implement process improvements using the Why Why analysis, and creating swim lane diagrams before and after the improvement to illustrate the flow of transportation information. Google Workspace and Google Apps Script will be utilized to record and store transportation data, real-time transportation status notifications will be provided via the LINE application, and delivery in full on time report will be generated in the form of an online dashboard using Looker Studio. The results of the research made it possible to reduce the waiting time for employees to report the transportation status from the original 5 hours down to 2 seconds, representing a reduction of 17,998 seconds or a reduction of 99.99 percent. It is also possible to summarize and report the delivery of goods in Overall and individual. At the same time, the satisfaction of 2 groups of users of the system was evaluated: the data recording group, which is transportation employees, and the data data group, which is transportation department executives. Satisfaction evaluation results found that The data recorder group had the highest level of overall satisfaction (Mean±S.D. = 4.43±0.53) and the data user group had the highest level of overall satisfaction (Mean±S.D. = 4.25±0.52).