International Journal of Science and Innovative Technology

Innovative Development of a Dual-Mode Herbal Foot Spa Prototype with Temperature Regulation and Time Control

2026-03-08T14:30:18+07:00

This research aims to design and develop a herbal foot spa machine using local resources for the Khao Na Tat Community Enterprise Group, Village No. 12. The focus is on developing a temperature and operating time control system, as well as evaluating the performance of the developed prototype. The developed foot spa machine has two operating modes: Mode 1 operates at a temperature range of 36–38 degrees Celsius for 15 minutes, and Mode 2 allows setting a target temperature of 37 degrees Celsius for 15 minutes. The prototype's basin is designed for optimal use, with a base measuring 21 cm wide, 29 cm. long, and 20 cm. high, and a top measuring 31 cm. wide and 40 cm. long, with 6 mm. diameter hot and cold-water pipe connections for water circulation. Temperature control testing showed that Mode 1 achieved a maximum average temperature of 37.85 degrees Celsius and a minimum average temperature of 36.00 degrees Celsius, while Mode 2 achieved a maximum average temperature of 37.19 degrees Celsius and a minimum average temperature of 37.00 degrees Celsius. The results demonstrate that the developed foot spa machine maintains stable temperature control as designed and has the potential for practical application at the community level.

Development and Efficiency of Experimental Inverter Air Conditioner System

2026-06-13T20:07:52+07:00

The objectives of this research were: (1) to develop and determine the efficiency of an inverter air conditioning system training unit, and (2) to study student learning achievement and satisfaction towards the developed training unit. The sample group consisted of 30 undergraduate students enrolled in the Refrigeration and Air Conditioning course. The research instruments included the inverter air conditioning training unit with accompanying laboratory manuals, a learning achievement test, and a satisfaction questionnaire. Data were analyzed using mean, standard deviation, dependent samples t-test, and the E₁/E₂ efficiency formula.The results of the research revealed that: (1) the efficiency of the developed inverter air conditioning training unit was 80.08/83.33, which met the established 80/80 criteria; (2) the students' post-test scores were significantly higher than their pre-test scores at a 0.01 level of statistical significance; and (3) the students’ satisfaction with the training unit and the learning method was at a high level. These findings indicate that the developed training unit is an effective instructional tool for practical application in related courses.

Modeling of a Grid-Connected Solar Photovoltaic Power Generation System for Thailand

2026-06-13T20:29:34+07:00

The creation of a 3D Solar System Simulation Model for the buildings and surrounding areas of Mission Hospital Phuket was conducted using PVsyst Photovoltaic Software Version 7.3.1 to design and simulate the performance and energy losses of the solar photovoltaic system. The research methodology involved data collection and analysis to simulate system performance through four main steps: (1) collection of meteorological and site-specific data; (2) configuration of system parameters; (3) simulation and energy production analysis under the Grid-Connected System mode; and (4) technical evaluation aimed at maximizing installation and operational efficiency. The study reveals that the annual electricity production simulation results are as follows: (1) Produced Energy: 329,664 kWh/year (kilowatt-hours per year) (2) Specific Production: 1,475 kWh/kWp/year (annual energy yield per kilowatt-peak of installed capacity) (3) Performance Ratio (PR): 78.56% (4)PV Field Orientation: Fixed planes configured across 4 distinct directions (5) Horizon: Free Horizon, indicating no landscape obstacles to obstruct horizontal sunlight (6) Sheds Configuration: Comprises 352 rows of identical solar PV modules with identical electrical specifications (7) Models Used: Transposition (Radiation Calculation): Perez Model; Diffuse Sky Radiation: Perez, Meteonorm separate model; Circumsolar Radiation: Meteonorm separate model (8) Near Shadings: Evaluated using the Linear Shadings calculation method (9) User's Needs: Configured as an "Unlimited load (grid)," denoting a grid-connected system with continuous grid backup. Ultimately, the findings of this research serve as a practical guideline for assessing the actual feasibility of solar power system installations within the Thai context.

Biological Treatment of Cafeteria Wastewater Using Microbial Cultures: A Case Study at Kasetsart University

2026-06-14T16:57:03+07:00

This study aimed to evaluate the effectiveness of microbial augmentation using Bacillus spp. and lipase-producing microorganisms in enhancing the performance of an activated sludge system for cafeteria wastewater treatment at the Faculty of Science, Kasetsart University, Bangkhen Campus. The study was conducted over a 22-week period from June 13 to November 27, 2023. Influent and effluent wastewater qualities were monitored using biochemical oxygen demand (BOD₅), oil and grease (FOG), total dissolved solids (TDS), sulfide, and pH as the primary parameters. The treatment performance was compared with the Thai effluent standards for Category C buildings.

The results demonstrated that microbial augmentation combined with operational improvements significantly enhanced wastewater treatment efficiency. At the end of the experimental period, BOD₅ decreased from 1,255 to 7.40 mg/L, achieving a removal efficiency of 99.41%. FOG decreased from 617 to 5.60 mg/L with a removal efficiency of 99.09%, while TDS decreased from 1,043 to 200 mg/L, corresponding to an 80.82% reduction. Sulfide concentrations decreased from 4.12 mg S²⁻/L to non-detectable levels. The effluent pH ranged from 6.49 to 7.46, indicating suitable conditions for microbial activity and compliance with regulatory standards. However, system instability was observed during the initial operational phase, highlighting the importance of appropriate control of organic loading, aeration, and microbial dosing.

The findings suggest that microbial augmentation effectively improves cafeteria wastewater treatment performance by enhancing the removal of biodegradable organic matter, fats, oils, grease, and odor-causing compounds. Furthermore, this approach supports Green University initiatives by promoting sustainable wastewater management and minimizing environmental impacts.