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6 results on '"Sathit Banthuek"'

1. Grid Integration of Livestock Biogas Using Self-Excited Induction Generator and Spark-Ignition Engine

Author

Panupon Trairat, Sakda Somkun, Tanakorn Kaewchum, Tawat Suriwong, Pisit Maneechot, Teerapon Panpho, Wikarn Wansungnern, Sathit Banthuek, Bongkot Prasit, and Tanongkiat Kiatsiriroat

Subjects
back-to-back converter, biogas, induction generator, spark-ignition engine, sustainable energy, Technology
Abstract

This study developed a grid-connected biogas power generation system for a rural community using a 3-phase 2.2 kW squirrel-cage induction machine as the self-excited induction generator. The generator was driven by a 196 cc single-cylinder spark-ignition engine fueled by biogas. We developed a back-to-back converter that consists of a 3-phase PWM rectifier as the generator-side converter and a single-phase LCL-filtered grid-connected inverter. The generator-side converter transferred the active power to the grid-side converter and supplied the reactive power control back to the generator. The notch filter-based bus voltage control on the generator side mitigated the inter-harmonics in the generator current. The injected grid current complied with the IEEE 1547 standard because of the multi-frequency unbalanced synchronous reference frame control. The proposed system was validated with biogas produced from pig manure at a pig farm in central Thailand, which found a maximum output of 1.2 kW with a thermal system efficiency of 10.7%. The proposed system was scheduled to operate at 1.2 kW for 8 h per day with a levelized cost of 0.07 US$/kWh, 42% cheaper than the retail electricity price, and a payback period of 2.76 years. The proposed system is suitable for a farm with a minimum of 34 pigs.

Published
2023
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2. Influence of Ni–Al coating thickness on spectral selectivity and thermal performance of parabolic trough collector

Author

Tawat Suriwong, Chanon Bunmephiphit, Warisa Wamae, and Sathit Banthuek

Subjects
Ni–Al, Solar absorber, Solar absorptance, Thermal performance, Parabolic trough collector (PTC), Energy conservation, TJ163.26-163.5, Renewable energy sources, TJ807-830
Abstract

Abstract This study investigates the influence of Ni–Al coating thickness on the spectral selectivity and thermal performance of a parabolic trough collector (PTC). Three thicknesses of Ni–Al coating for use as solar absorber material were successfully prepared on the outer surface of a stainless steel 316L (SS) tube by flame spray. The phase, morphology, and reflectance (R) of the Ni–Al coatings were characterized using several techniques. The PTC and solar receiver tube were specially designed and constructed for observing the collector thermal performance by following ASHRAE 93-1986. Looking at the results, the actual average thicknesses of the three Ni–Al coatings turn out to be 195, 215, and 299 μm. The morphology and chemical composition of all three thicknesses are similar. The chemical composition in the cross-sectional view exhibits non-uniform distribution. The three thicknesses of the coating are composed of NiO and Al2O3 phases, which also corresponded to the results of SEM–EDX mapping. The differences in a solar absorptance (α) of the three thicknesses of Ni–Al coating are not statistically significant, with an average α value of 0.74–0.75. However, there are differences in thermal efficiency of the PTC depending on the thickness of the Ni–Al coating. Of the three samples, the thickest one (299 µm) demonstrates the highest ability to convert solar radiation into thermal energy.

Published
2018
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3. Development of Thermal Energy Storage as a Supplemental Heat Source for Solar Dryer

Author

Sathit Banthuek, Wikarn Wansungnern, and Malinee Kaewpanha

Subjects
Solar dryer, Mechanics of Materials, business.industry, 020209 energy, Mechanical Engineering, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, General Materials Science, 02 engineering and technology, Process engineering, business, Thermal energy storage, Phase-change material
Abstract

The current work presents about the development of thermal energy storage (TES) using paraffin wax as a phase change material (PCM). In order to investigate the performance of TES as a supplemental heat source for solar dryer when no sunshine, the TES was connected with solar dryer having maximum capacity for 10 kg of fresh chilies. The TES unit consists of 28.35 kg PCM and copper tube inside the cylindrical tank. The charging process of the TES is carried out with the help of electrical heater. The paraffin wax in the TES starts to melt and absorb the energy till it turns to liquid state. For heat discharging process during the off sunshine hours, air with mass flow rate of 0.0023 kg/s at ambient temperature can be passed through the copper tube in the TES in order to provide hot air for the dryer. From the performance analysis results, it is observed that the temperature of drying chamber can be maintained about 40-50 °C for 3 hours at least after sunset and higher than ambient temperature about 16.72 °C. The novel design of TES successfully increases the performance of the drying systems and reduces the time for drying process.

Published
2018

4. Application of Ni-Al 2 O 3 cermet coating on aluminium fin as the solar absorber in evacuated tube collector (ETC)

Author

Amanuel Andemeskel, Sathit Banthuek, Tawat Suriwong, and Pornnipa Nunocha

Subjects
Materials science, 020209 energy, Vacuum tube, chemistry.chemical_element, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, law.invention, Fin (extended surface), Heat pipe, Coating, chemistry, law, Aluminium, Heat transfer, 0202 electrical engineering, electronic engineering, information engineering, engineering, Tube (fluid conveyance), Composite material, 0210 nano-technology, Layer (electronics)
Abstract

In a commercial evacuated tube collector (ETC) with a double layer tube, a solar absorber coated on outer surface of the inner glass of a vacuum tube, and aluminium (Al) fin is used for transferring heat from the solar absorber to the heat pipe. In the present study, the Al fin inside the ETC was initiated to be a solar absorber and heat transfer medium together with using a clear double layer evacuated tube. Various thicknesses of Ni-pigmented alumina (Ni-Al2O3) layer over the Al fin were prepared using the anodic anodization process. The thickness and solar absorptance (α) of all samples were investigated. The collector thermal efficiency (η) of the ETC with different thicknesses of Ni-Al2O3 coating over Al fin as the solar absorber was evaluated, following standard ISO 9806-1. The thicknesses of Ni-Al2O3 coatings were 11, 12, and 16 µm. For each thickness, the α over the whole wavelength of the solar spectrum had an identical value (∼0.94). The maximum collector thermal efficiency, FR (τα), of the new prototype ETC at each thickness was 0.71, 0.72 and 0.81. The -FRUL term for each thickness was -15.66, -15.83 and -18.56 W/m2·°C.

Published
2018

5. The effect of annealing temperature on selective solar absorptance of Ni-Al coating prepared by flame spray technique

Author

Warisa Wamae, Chanon Bunmephiphit, Tawat Suriwong, Amanuel Andemeskel, and Sathit Banthuek

Subjects
010302 applied physics, Materials science, Annealing (metallurgy), Non-blocking I/O, Composite number, Oxide, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Metal, chemistry.chemical_compound, Coating, chemistry, visual_art, 0103 physical sciences, Thermal, visual_art.visual_art_medium, engineering, Composite material, 0210 nano-technology, Thermal spraying
Abstract

Ni-Al coating has been considered a promising candidate as a solar absorber material in solar thermal applications operating at mid-to high-temperatures. In a previous study by the current authors, a Ni-Al composite layer was applied as a coating onto a stainless steel 316L pipe using the flame spray technique. The solar absorptance (αsol) achieved, however, was relatively low compared to other commercial solar absorber coatings. To enhance the αsol of the Ni-Al, the annealing process was performed on this coating. The results clearly revealed that the metal oxides on the surface of the Ni-Al coating were NiO and Al2O3. As the annealing temperature increased, the reflectance (R) slightly decreased, while the αsol significantly increased. This was caused by the layer of metal oxides covering the surface of the Ni-Al coating functioning as an antireflection (AR) layer. The αsol of the Ni-Al coating increased approximately 13% after annealing at 800°C, compared to the unannealed Ni-Al coating. It is therefore clear that the annealed Ni-Al coating enhances the αsol due to the antireflection effect between the metal oxide layer and the underlying Ni-Al composite coating.

Published
2018

6. A new prototype of thermoelectric egg incubator integrated with thermal energy storage and photovoltaic panels.

Author

Tawat Suriwong, Sathit Banthuek, Ekachai Singhadet, and Somchai Jiajitsawat

Subjects
*EGG incubation, *THERMOELECTRICITY, *HEAT storage, *PHOTOVOLTAIC cells, *PHASE change materials
Abstract

The purpose of this study is to develop a thermoelectric egg incubator (TEI) integrated with a thermal energy storage (TES) system, using electricity from photovoltaic (PV) cells in order to operate without on-grid electricity. The TEI was constructed with the same dimensions as a commercial egg incubator (CEI), which was made to the required dimensions for hatching 24 eggs per period of 21 days. The TEI was designed with 2 operating modes of heat sources: a thermoelectric (TE) module used for daytime operation and a TES containing phasechange materials (PCM) which supplied heat to the TEI for nighttime operation. The PV panels were designed to be the primary energy source for generating 360 W of electricity, which was supplied to heat sources of TEI according to the energy load for providing fertile chicken eggs (24 eggs/hatching). The incubating temperature and relative humidity (RH) inside the TEI-TES were controlled under optimum environmental conditions for hatching (36-39°C and 60-80% RH) to stimulate embryonic growth. As a result, the TEI-TES achieved and maintained an optimum incubating temperature in the range of 36.7-38.8°C and the correct RH of 66±0.2 % in the warm weather of Thailand over the incubating period of 21 days. The TEI-TES was able to maintain optimum environmental conditions for chicken-egg hatching, and its performance was comparable to that of the CEI. The working mechanisms of the TE module and TES are also discussed. The results show that the TEI-TES with PV panels as the primary energy source is suitable for use in remote areas which have no on-grid electricity supply. [ABSTRACT FROM AUTHOR]

Published
2017

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