วารสารวิชาการเทคโนโลยีอุตสาหกรรม (J. Ind. Tech.) อยู่ในฐานข้อมูล Thai-Journal Citation Index Centre (TCI) กลุ่ม 1 (2564 - 2567) และ Asean Citation Index (ACI) มีค่า JIF = 0.094 และ T-JIF (3 ปีย้อนหลัง): 0.165 | The Journal of Industrial Technology (J. Ind. Tech.) is indexed in Thai-Journal Citation Index Centre (TCI) Tier 1 (2021 - 2024) and Asean Citation Index (ACI) with impact factor, T-JIF: 0.094 and 3-years T-JIF: 0.165

Articles

A Study on Knowledge and Skills Essential for Work Safety in Automotive Factories

Machanical Engineering

The objectives of this study were to study the factors that affect the work safety of employees in the automotive parts manufacturing industry according to the supervisor opinion and study the knowledge and skills necessary to manage the safety in the operation of employees in the automotive parts production line. The samples were the supervisor of the production department of the automotive parts manufacturing industry in the areas of Rayong, Chonburi and Chachoengsao. Questionnaires and statistics used in the analysis were frequency, percentage, mean and standard deviation. The results showed that the factors that affect the safety of the employees in the automotive parts manufacturing industry as a whole were at a high level. (x􀴤 = 4.08) Including factors on each side, with an average of all levels, The most average aspect is the working environment. (x􀴤 = 4.23) The person with the lowest. (x􀴤 = 3.94) The knowledge and skills necessary for the supervisor to manage safely in the overall picture were at a high average. (x􀴤 = 4.00) Especially the knowledge of the operation is the highest average. (x􀴤 = 4.08) Which the skills of good leaders that the supervisor or the senior management must use a lot of technical skills including knowledge and expertise in the operations of that department to resolve problems with subordinates.

An Experimental Study of Performances in a Large Diesel Engine Fuelled with Diesel and LNG

Machanical Engineering

According to the increase of energy demand and environmental crisis, natural gas has been studied and considered as one of the clean alternative fuels. However, knocking phenomena is unavoidable when large diesel engines operate with natural gas. This research aimed to investigate a large diesel engine fuelled with diesel – natural gas dual fuel system. Firstly, two natural gas vaporizers were tested to find the appropriate one. Then, a comparative experimental between diesel operation and dual-fuel operation was conducted. Output performance was considered and found that vaporizer with 3.8-metre internal length heat exchanger was more advantageous. Thus, this vaporizer was installed in the tested engine. The experiment was done over the speed range between 1,100 to 2,000 rpm. It was found that dual-fuel engine produced less torque and power than those of diesel engine around 2.10%, which was still acceptable in actual application. The result found that the amount of injected natural gas must be controlled as a function of engine speed to avoid engine knocking. Averagely, the natural gas was injected into the system around 71.32%. This leaded to the reduction of engine volumetric and thermal efficiencies around 2.73% and 3.5% respectively.

Analyzing and Comparing Heat Transferring with Area and Weight of Tube Extending Array of Fin

Machanical Engineering

This paper is analyzing and comparing between heat transfer rate and surface area and weight of tube with array of fin. They are rectangular and circular fins when are changed parameters such as size, shape, material, convective coefficient and number of fin. Analyzing fin of 1 to 2 mm thickness, convective coefficient around fin from 5 to 30W/m2°C, tube outside diameter of 1 to 2 in. and ratio of rt/rb from 1.5 to 4. made of copper and alloy steel. In analyzing, it is found that tube extended with 2 rectangular fins made of copper gain maximum heat transfer rate about 2.9 time of tube without fin and if fins are made of alloy steel gain maximum heat transfer rate about 2.7 time of tube without fin while it has outside area about 1.3 to 2.9 time of tube without fin and has maximum weight about 2.6 time of tube without fin. Tube extended with 5 circular fins made of copper gain maximum heat transfer rate about 2.7 time of tube without fin and if fins are made of alloy steel gain maximum heat transfer rate about 2.3 time of tube without fin while it has outside area about 1.07 to 1.95 time of tube without fin if it has outside diameter of 1.0 in. and has outside area about 1.15 –2.9 time of tube without fin if it has outside diameter of 2.0 in. and has maximum weight to about 2 time of tube without fin.

Assessment of Wind Energy Potential in Thailand Based on Using the Multiple-Weibull Distribution

Machanical Engineering

Wind energy potential analysis is a design key to maximize wind turbine efficiency and annual energy output. Typically, the annual wind speed frequency is represented by a Single-Weibull distribution curve in spite of strong and calm wind patterns could occur through a year in many regions in the world, Thailand for instance. For this reason, wind energy potential should be analyzed by Multiple-Weibull distribution curves which are the representative of the meteorological seasons due to the monsoon’s effect. Therefore the objective of this study is to compare the accuracy of the Single-Weibull distribution and the Multiple-Weibull distribution in assessment of wind energy potential. The comparison was made between these two statistical distribution functions and the actual wind speed distribution (measured wind speed frequency) in order to determine the level of credibility of these two distribution functions. The wind speed data employed in this study was measured at Lamtakhong dam site in Nakhon Ratchasima province, Thailand. As the results, the error between the Single-Weibull distribution was 16.46% where the error between the Multiple-Weibull distribution was 14.82%, it was revealed that the smaller error, the higher reliability. Two of the most widely used wind turbines (Enercon E-30 and Windspot) were selected to verify the Multiple-Weibull concept. Approximately 40% increase in annual energy yield by using this method. So, the results confirmed that the Multiple-Weibull distribution is valid for the assessment of the annual energy production of wind turbines. Therefore, this will be a practical method for achieving the optimal design of stall-regulated wind turbine in the further work.

Blade Element Momentum Theory for Estimating Efficiency of Thai Sail Windmill

Machanical Engineering

Thai sail windmill (TSW) is a local machine of Thailand now using for pumping brine to the salt farms. TSW is a horizontal axis wind turbine that the blade is a triangular shape made of canvas. Traditional TSW efficiency is typically about 10-17%. However, it has been now developed and augmented its efficiency until 30-35%. Therefore, due to a low construction cost, an uncomplicated structure and a higher efficiency, these things encourage TSW more interesting for research. By the way, the wind turbine simulation is one significant research topic because the accurate simulation can bring about the evaluation of torque, power and efficiency correctly in another condition without the experiment. So, the simulation is very helpful to design the blade of the wind turbine. The purpose of this article is to perform the TSW simulation based on the blade element momentum theory to appraise the efficiency and to validate results with the experiment data. The efficiency evaluation would be regarded by 4 manners of the tip pitch angle as follows: 5, 10, 15 and 20 degrees. The results show that the TSW efficiencies estimated by the simulation are accurate at the tip pitch angle of 10, 15 and 20 degrees in the range of tip speed ratio of 2.0-3.5 whose average percentage error is about 7.0%.

Get alert for journal's news

Get alert for journal's news. You can recieve journal up-to-date information by giving your email to us.