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An approach to energy conservation in lighting systems using luminaire-based sensor for automatic dimming
(2025-12-01)
Jettanasen, Chaiyan
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Thongsuk, Surakit
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Sottiyaphai, Chayanut
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Songsukthawan, Panapong
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Chiradeja, Pathomthat
Lighting systems account for a significant proportion of energy consumption in buildings. Therefore, energy conservation within these systems can greatly enhance overall building energy efficiency. This study proposes a control strategy for LED lamps by adjusting lighting intensity and improving the performance of electric luminaires. The approach involves implementing an automated dimming system that adapts lighting intensity based on surrounding light levels. A system comprising an ambient light sensor, microcontroller, power supply module, dimming controller, and lamp was developed. The sensors measure brightness within a specified range in real time, and the microcontroller analyzes and compares this data against the brightness settings for specific areas. The designed control system was tested in a laboratory setup to demonstrate its effectiveness in a controlled environment. Results showed a 75.65% reduction in power consumption compared to standard lamps in a simulated environment, highlighting its potential for significant energy savings in buildings and its contribution to environmental sustainability.
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Assessment of bio-methanol and electricity co-production via the integration of biomass-to-methanol process, solid oxide electrolyzer, and power generator
(2025-11-01)
Detchusananard, Thanaphorn
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Wiranarongkorn, Kunlanan
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Im-orb, Karittha
The performance assessment of an integrated biomass to methanol and solid oxide electrolyzer with and without a power generation unit (BtM-SOEC-PG and BtM-SOEC), utilizing purge gas from BtM for production of bio-methanol and electricity, is performed. For BtM-SOEC-PG, two utilization routes of low pressure (LP) steam leaving the power generation system (case 1: LP steam is exported to external users (BtM-SOEC-PG-LPEX) and case 2: LP steam is utilized in the process (BtM-SOEC-PG-LPUT)) are examined to determine the impact on process performance of recycling purge gas from BtM to either the methanol reactor or the power generation unit. In all cases, the bio-methanol production increases with increased purge gas recycling, whereas the power generation decreases. The direct CO<inf>2</inf> emissions are also improved with increased recycling. Two BtM-SOEC-PG cases are an exothermic process, and the degree of exothermicity increased with purge gas recycling. However, the BtM-SOEC-PG-LPUT with 90 % purge gas recycling offers a maximum methanol production rate of 15.99 kg/h, and under these conditions, 3.17 kW of electricity is generated and 56.18 % energy efficiency is obtained. The energy efficiency of the BtM-SOEC-PG-LPUT, with 90 % purge gas recycling, could potentially be enhanced by 10.42 % due to pinch analysis and heat exchanger network (HEN) design. Exergy analysis indicates that the gasifier is the primary unit of exergy destruction, followed by the combustion unit and the autothermal reformer (ATR) in the second and third positions, respectively. Furthermore, the BtM-SOEC-PG-LPUT with 90 % purge gas recycling offers a competitive cost of bio-methanol (824.37 USD/ton) compared to BtM-SOEC.
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Effects of hot air temperature on moisture reduction and drying time of turmeric in a closed-system herb dryer: kinetics and models
(2023-11-01)
Chindaruksa, Sirinuch
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Bongkaew, Haruethai
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Wardkein, Paramote
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Chantrawongphisal, Borisut
The primary objective of this research was to devise a model focused on the drying kinetics of turmeric, utilizing a closed-system herb dryer to facilitate energy conservation. Drying turmeric within this closed-system herb dryer involves a heat source—specifically, an electric coil heater powered at 3500 W and a humidity controller. The drying condition includes an air volume of 0.039 kg/s, the temperature at 40, 50, and 60 °C with initial moisture of the turmeric at 667.53 %db. The result of drying turmeric was analyzed using a thin-layer drying model for 8 models: Newton, Page, Logistic, Henderson and Pabis, Logarithmic, Two-Term, Approximation of Diffusion, Midill et al. The result shows that Midill et al. equation was the best model for predicting the drying behavior of turmeric. Therefore, this insinuates that the Midill model is superior to its contemporaneous counterparts in terms of accuracy. It offered the highest coefficient of determination R 2 (0.9998, 0.9996, 0.9999), the most root mean square error (RMSE) (3.39×10−9, 2.37×10−5, 3.10×10−5), the last chi-square χ 2 (3.39×10−9, 2.85×10−5, 3.99×10−5), and a temperature of 40, 50, and 60 °C, respectively. The study revealed that implementing a closed-system herb dryer could potentially manufacture high-value commodities while preserving their fundamental attributes. The closed-system herb dryer has been ingeniously designed as a proficient approach to diminish the drying time and improve the end product’s quality.
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Novel foodstuff conveyor belts compound for energy saving: The effect of microwave pre-heating and mixed fillerson mechanical properties
(2017-01-01)
Limhengha, S.
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Limnararat, S.
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Jangchud, I.
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Sriseubsai, W.
This research presents an effect of microwave power being utilized in preheating of a foodstuff conveyor belts compound (FCBc), with or without mixed fillers, and sulfur at different volumes of 1.0, 1.5 and 2.0 phr respectively. Prior to hydraulic molding press at 150 oC, an FCBc is preheated for one minute through an industrial microwave system at a frequency of 2.45 GHz along with microwave power of 340, 850 and 1,700 watts whereas the cure timeis a time 50%. The result shows that the FCBc with mixed fillers and 1.0 phr sulfur with microwave power at 340 watts demonstrates an effective crosslink between the rubber and the fillers which subsequently produces the FCBc that contains better mechanical properties, not only at the lower cost on raw material but also the curing time reduces to 40.20 % per production round.
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Energy saving characteristics of an internal heat integrated reactive distillation process for methyl acetate synthesis
(2016-03-20)
Yamaki, Takehiro
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Matsuda, Keigo
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Na-Ranong, Duangkamol
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Matsumoto, Hideyuki
A model for an internally heat integrated reactive distillation process without a compressor was developed, and the synthesis of methyl acetate from methanol and acetic acid was simulated. The applicability was evaluated by using the process simulator Aspen Plus. The steady state simulation showed that the energy consumption of the heat integrated reactive distillation process was lower than that of conventional reactive distillation.
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A study an impact of daylight with period time on illuminance and uniformity for building
(2015-01-01)
Sripramong, S.
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Ananwattanaporn, S.
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Ngaopitakkul, A.
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Jettanasen, C.
The daylight can be applied for lighting system in building to reduce energy consumption. Although the illuminance on the task area can be increased using the daylight but various factors must be taken into account. This research aims to study an impact of illuminance with daylight in term of each time period. The illuminance is calculated with daylight function in DIALux program. In addition, the fluorescent T5 tube lamp is used in simulation. The case study room without daylight (base case) is compared, in term of illuminance, with the case study room with daylight of each time period. The obtained results show that the daylight can increase the illuminance in the building so the lighting system in many modern buildings has applied daylight in order to achieve specific result of energy savings. The obtained results are useful for design of the interior lighting system.
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New low-grade sugar boiling technique using two-stage seed production for better crystallization and lower energy consumption in cane sugar industry
(2014-02-04)
Puaughom, Charoenchai
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Pankarnchanato, Phichet
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Limsutthiphong, Pornchai
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Julsereewong, Amphawan
This article presents a new technique for improving low-grade sugar boiling station to produce a single grade raw sugar. The proposed modification method is based on a seed production using two-stage batch system with two pans. Daily reports of production of quality raw sugar of about 99° Z during the period before (2011/12 crushing season) and after (2012/13 crushing season) the improvement at Saraburi Sugar Co., Ltd., Thailand, whose crystallization process was modified, are used to validate the new proposed technique. Comparison results show that the proposed sugar boiling system provides more efficient crystallization and less steam and electrical power consumptions to produce raw sugar with acceptable characteristics. © 2014 ISSN 2185-2766.
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Effective energy saving for cold rolling mill driven by large DC motors in steel production industry
(2014-02-04)
Kummool, Sart
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Julsereewong, Prasit
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Lerdlum, Nattawoot
A useful technique to reduce power consumption for cold rolling mill driven by large direct current (DC) motors in steel production industry is introduced. The proposed method is based on automatically stopping cooling units and shunt-field winding exciters of DC motors for operating the mill in maintenance mode and long-time stand-by mode. The smart relay modules and normally-closed contractors used for energy saving are controlled via an existing direct digital control (DDC) system. Performance of the proposed technique has been observed at a Sendzimir cold rolling mill using the stand driven by three couples of 2,150 kW DC motors in Thailand. Experimental results show that the proposed method provides saving in energy cost in a short payback period. © 2014 ISSN 2185-2766.
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PWM AC chopper control schemes for energy saving of single-phase induction motors
(2012-12-01)
Thanyaphirak, Veera
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Kinnares, Vijit
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Kunakorn, Anantawat
This paper presents control schemes for energy saving of a capacitor start and run type single-phase induction motor using a PWM AC Chopper to adjust the appropriate motor voltage under various load levels. MATLAB/Simulink is used for the simulation. The main winding stator current is used to feedback for minus with the appropriate current obtained from the multiple of the auxiliary winding stator current and the appropriate constant. Then, the error is sent to a PI Controller. The output of the PI controller will be compared with a carrier to generate PWM signals for controlling all bidirectional switches of the single-phase AC chopper. With the proposed scheme under any motor load level, the motor will always operate at the rated speed, which allows for high efficiency and energy saving. The motor energy saving is 43.97%, particularly at light load. © 2012 IEEE.
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Energy saving of three-phase induction motor using fuzzy controller
(2006-12-01)
Tipsuwanporn, V.
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Intajag, S.
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Harnnarong, S.
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Krongratana, V.
This paper presents energy saving of three-phase induction motor, which is operated in regenerative mode. In this mode, the energy flows back into DC link voltage and causes to occur high voltage in capacitor that may be destroy the capacitor and switching component such an IGBT. The proposed method presents connection buck converter circuit between the rectifier diodes and the inverter, to control the voltage feeding into the inverter by using two fuzzy controllers. The first fuzzy controller will be managing the switching duty cycle of buck converter. The second fuzzy controller, which provide to control the switching component of braking circuit. The second controller will be synchronized with the first controller to balance the energy of the capacitor. © 2006 ICASE.

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