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Maximum power point tracking (MPPT) is the back bone of most photovoltaic (PV) systems. The MPPT technique helps in extracting the maximum power available from a PV panel under varying atmospheric and load conditions. As the environmental conditions fluctuate throughout the day, maximum power point tracker along with the power converter forces the PV panel to deliver maximum power to the load. Performance...
Convection heat transfer characteristics in a single rock fracture was experimentally investigated in this work. Distilled water was used as working medium for heat transfer in manmade smooth and rough fractures of sandstone and granite samples. The influence of fracture surface roughness on heat transfer intensity was analyzed. During seepage heat transfer process, evolution of samples external surface...
It is essential to understand the relative permeability of CO2 and brine when characterizing the flow of CO2 as it is injected into an aquifer. The relative permeability of CO2 and brine has a significant impact on CO2 migration and saturation distribution. This paper presents the results of experimental investigations into the effects of the viscosity ratio and interfacial tension (IFT) on steady-state...
A novel process model has been proposed for biomass gasification integrated with combined heat and power generation using various biomass, which have been selected based on availability in abundant quantities from different regions of India. In the proposed system, high thermal energy carried out by gasification products has been utilized to operate a combined heat and power cycle system consisting...
To improve the economy and emission performance of automotive gasoline engine, the approach of lean combustion coupling with intake tumble was investigated. A port blocker was designed on intake manifold so as to generate intake tumble, and then the sweeping test of excess air coefficient was conducted under engine common conditions (2000 r/min, 2.6 bar) in two port blocker states (opening and closing)...
This work investigates the behavior of a solar power generation system that consists of a concentrated photovoltaic/thermal (CPV/T) system that utilizes an Organic Rankine Cycle (ORC) integrated with a geothermal condenser and an energy storage unit. The storage unit consists of an electrolyser and Proton Exchange Membrane (PEM) fuel cells. The electrolyser that is powered by both the PV cells and...
Pyrolysis characteristic of hydrogenated palm oil (HPO) was analyzed using TG, TG-FTIR-MS and Py-GC-MS. Bio-fuel oil (BFO) was obtained using catalytic cracking method. The BFO was analyzed by FTIR, 1H NMR, 13C NMR, GC-MS and ESI FT-ICR MS to provide complementary and comprehensive adequate information. TG-DTG results showed that the HPO pyrolysis was different with other plant oil. It was clear that...
A vortex tube (VT) is a very simple, yet effective device to generate instantaneous spot cooling effect, using compressed air as input. Present work is experimental analysis of effect of insulation on temperature separation performance of VT. Firstly, reliability of experimental setup and experimentation procedure is established through observation of transitional characteristics & energy balance...
We studied the relationship between the change in the price of oil and some of its determinants, using a structural equation model. The demand for oil is confirmed to be inelastic to the change in oil price during our sampling period. Economic activity is found to be the most significant factor in explaining the dynamics of oil price. Wars and political tension, among the largest oil producers and...
Accurate battery state of charge (SOC) estimation can contribute to a reasonable charging/discharging strategy for battery management systems (BMSs). It can also prevent severe damage to the battery (pack) caused by over-charging or over-discharging. This work develops a battery SOC estimation method based on a simplified electrochemical model. Simulated validation under dynamic current loads at room...
This paper presents a study on the effect of solidity and airfoil profile on the performance of Vertical Axis Wind Turbines (VAWTs). A 1.1 kW commercially viable Darrieus VAWT was studied using ANSYS Fluent. Four different airfoils – NACA 0012, NACA 0015, NACA 0030 and AIR 001 – were considered in the analysis. The tip speed ratios (λ) were varied from 1 to 2.5 with an incoming wind velocity of 10 m/s...
The main purpose of this paper is experimentally comparing of organic Rankine cycle (ORC) system, by using R245fa, R123 and their mixtures to generate maximum net power on simulated low-temperature industrial waste heat. Four mass fractions of R245fa:R123 have been injected into the system with the ratios of 1:0, 2:1, 1:2 and 0:1 to test the system performance separately. To imitate industrial low-temperature...
The BrOx (Bromination-Oxidation) cycle is a novel process that enables energy generation from natural gas without concomitant CO2 emissions. The cycle's main units are two exothermic reactions and two separation steps that result in an overall process in which methane and oxygen yield water, solid carbon and energy. The flowsheeting of the process has been conducted and optimised with Aspen Plus®...
This paper discussed the design and development of a 2 kVA three-phase off-board electric vehicle charger prototype with a practical voltage control, where the procedures of the experimental construction were comprehensively presented. For the experimental setup, the effectiveness of the interface circuits and auxiliary power supply units were individually validated. Moreover, the electric vehicle...
The Darrieus wind turbine is a type of vertical-axis wind turbines which, in spite of its simple structure, is very complex to analyze. In terms of aerodynamics, Darrieus VAWTs have properties which tend to make them distinctive of horizontal-axis wind turbines but generally are less effective. In the present research, a cavity is created into blade's profile of a VAWT to enhance its performance....
Hybrid electric tracked bulldozers use engine and ultracapacitor as the power sources for propulsion, and the fuel economy performance highly depend on the coordination of all subsystems. In this paper, a model predictive controller is developed to reduce the fuel consumption of hybrid electric tracked bulldozers. As an optimization-based approach, the model predictive controller usually requires...
Assessment of the sustainability of alternative transport fuels is essential for directing the development while reducing their impacts. The aim of this paper is to assess the environmental and economic life cycle impacts of alternative transport fuels and compare with conventional fuels. The sustainability assessment was performed for selected fuels, including diesel, gasoline, liquefied petroleum...
The introduction of electric vehicles on the power grid translates to operational challenges and opportunities of using these vehicles as distributed energy resources. This paper presents an algorithm for utilities to identify optimal scenarios for controlling electric load of plug-in electric vehicles on a neighborhood transformer, and their potential contribution to reducing overloading through...
Among micro-cogeneration (μCHP) systems, an interesting solution is one based on the Stirling engine, which is the main object of interest of this paper. First, a numerical model of the engine was built based on Schmidt analysis. The model indicated the possible range of improvements resulting in increased efficiency or increased power. Next, the potential for the use of a μCHP system based on the...
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