Tawat Suriwong

Techno-Economic Analysis of PV Battery Charging Station in Kampot, Cambodia

 Abstract—This paper presents the technical and economic analysis of PV battery charging stations in Kampot, Cambodias situation. The solar radiation reflected by the air molecules, clouds and ground was obtained from the satellite data. The absorption of solar radiation due to water vapor was calculated from precipitable water derived from ambient relative humidity and temperature from Cambodian meteorological stations. The annual solar radiation from January to reach a peak in the summer months of March and April each year and the yearly map showed the features of a high solar radiation pattern in the southeast of Cambodia. The average value is 5.10kWh/m 2 /day can be observed in the southeast of the country. With the highest values of solar radiation, solar PV battery charging stations (PVBCS) will be installed in each village, which are not electrified by national grid or mini-grid projects by 2020, and where no battery charging station is currently operating in order to ensure that the Royal Government of Cambodias political objective of 100% village having electricity supply by 2020 from different sources of energy. With capacity of 10kW PV battery charging station in Kampot was calculated to evaluate and compare the technical and economic evaluation of c-Si PV modules and diesel battery charging station under the Kampot climate. The present electricity price of rural areas is about 0.22US

Characterization of Ni-Al Solar Absorber Prepared by Flame Spray Technique

/kWh showed that c-Si PV modules present not only high NPV (15,986US

Characterization and Spectral Selectivity of Sn-Al2O3 Solar Absorber

), IRR (0.041%), BCR (1.52) but shorter payback period (8.82 years) than the diesel battery charging station of 0.22US

Evaluation of Solar Fraction on a Solar Driven Dual Parallel Connected Ejector Cooling System

/kWh with the NPV (7,450US

Exergy Analysis of a Solar-Driven Dual Parallel-Connected Ejector Refrigeration System

), IRR (12%), BCR (1.70) and payback period (14.74 years) values. Based on the technical and economic evaluation of c-Si PV battery charging station, in fact, pointed the most suitable technology for people in rural areas in the kingdom of Cambodia.

Solid-state microwave induced plasma synthesis of antimony telluride

In this research, a Ni-Al solar absorber was successfully prepared by the flame spray technique with Ni-5 wt.%Al particles as a starting material. The Ni-5 wt.%Al particles were melted and sprayed onto the outer surface of a stainless steel 316L tube in order to form a Ni-Al composite coating. The phase, morphology and reflectance (R) spectrum of the Ni-Al solar absorber were characterized by X-ray Diffraction (XRD), a Scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) analyzer and an Ultraviolet-visible-near infrared spectrophotometer at the wavelength 300-2500 nm. The results revealed that the surface of the Ni-Al solar absorber was rough, and its cross section was overlapped layer by layer. The Ni-Al solar absorber was composed of Nickel (Ni) and aluminum (Al) phases. NiO and Al2O3 phases were also found on the surface. The chemical composition of the Ni-Al solar absorber was Ni (72.94 wt.%), Al (11.76 wt.%) and O (15.29 wt.%). The solar absorptance (α)of this solar absorber was 0.77. This demonstrates that a Ni-Al composite coating can be applied as a solar absorber material for solar collector at high operating temperatures.

Solid-state synthesis of cubic ZnTe nanocrystals using a microwave plasma

In present work, tin-pigmented alumina (Sn-Al2O3) solar absorber on the aluminium substrate was successfully prepared by anodic anodization and further characterized by different methods. The phase, morphology, reflectance (R) and thermal conductivity of the Sn-Al2O3 solar absorber were measured by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) equipped with energy dispersive X-ray (EDX) analyzer, and Ultraviolet-visible-near infrared spectrophotometer in the wavelength of 300-2500 nm. The solar absorptance (α) was calculated based on the relationship of the spectral reflectance, R(λ), and the solar spectral irradiance of AM 1.5, Is(λ), in the wavelength interval of 300-2500 nm. As the results, the surface color of the Sn-Al2O3 film was dark-black color. The XRD pattern of Sn-Al2O3 films was indexed as aluminium and tin phases. The chemical composition of the Sn-Al2O3 films composed of tin (Sn), aluminum (Al) and oxygen (O) elements. The average thickness of the produced films was 18.9 μm. It was found that Sn-Al2O3 films showed the low R (0.09) and high α (0.93) values for the whole wavelength 300-2500 nm, corresponding to theoretical properties of the solar absorber. Therefore, it can be concluded that the Sn-Al2O3 film on aluminium substrate can be applied to be the solar absorber in solar collector due to high α, which is similar to the commercial solar absorbers.

Thermoelectric and optical properties of CuAlO2 synthesized by direct microwave heating

This present study reports results of performance evaluation of a solar-driven dual parallel-connected ejector (DPE) cooling system using the concept of solar fraction (SF). The experiments were conducted in July and August, 2015 from 09:00 to 16:00 hours at School of Renewable Energy Technology (SERT), Naresuan University, Thailand, with a solar collector area of 2.4 m2, auxiliary heater of 3 kW, operating at boiler pressure of 2 bar and using water as working fluid. Temperature was measured for inlet and outlet of solar collector. The results showed that the solar collector supplied about 24% of energy required to operate the system. The solar collector performance was 11% and the monthly average SF was 23.9% for July and 23.5% for August.

Technical and Economic Viability Assessment of PV Power Plants for Rural Electrification in the Gambia

Nowadays, developing solar cooling technologies, especially ejector refrigeration system, has become preferable to scientific researchers. Exergy analysis is a technique in which the basis of evaluation of thermodynamic losses follows the second law rather than the first law of thermodynamics. An experimental exergy analysis of a solar-driven dual parallel-connected ejector (DPE) refrigeration system was conducted using water as working fluid. Saturated steam with 2 bar and 120oC was provided by heat–pipe evacuated tube solar collector with an assistant of an electric heater. The saturated stream was used as a motive flow for the ejectors. The exergy destruction and exergetic efficiency of the main components of the DPE refrigeration system were determined and compared with those when using a single ejector (SE) under same operating conditions. It was found that the most irreversibilities of both systems occurred at the solar collector, electric boiler and ejectors, respectively. Also, the total irreversibility (Exergy destruction) of the system when using DPE was lower than using a SE. In additions, the exergetic efficiency of the ejector, evaporator, and overall system when using DPE were increased by 21%, 10%, and 27%, respectively. The system thermal ratio (STR) and coefficient of performance (COP) of the system using DPE compared with SE were increased by 20% and 23%, respectively.

Synthesis and thermal conductivities of ZnIn2Te4 and CdIn2Te4 with defect-chalcopyrite structure

The utility of microwave heating and microwave generating of plasma as a synthetic technique toward the synthesis of Sb2Te3 is reported. The solid-state microwave synthetic method was studied the effects of irradiation times and cycles, and molar ratio of Sb:Te at a 900 W irradiated microwave power in order to determine phase purity of the reaction products. X-ray powder diffraction, field-emission scanning and transmission electron microscopic, including Raman spectroscopic techniques were used to investigate their phase, structures, surface morphologies and vibration characteristics. Their optical properties were also investigated by UV-vis and luminescent spectrophotometries.