scholarly journals Simulation Of the Conical Gravitational Water Vortex Turbine (GWVT) Design in Producing Optimum Force for Energy Production

2021 ◽  
Vol 89 (2) ◽  
pp. 99-113
Author(s):  
Muhammad Qamaran Abdul Aziz ◽  
Juferi Idris ◽  
Muhammad Firdaus Abdullah
Keyword(s):  
Rural Area ◽  
Flow Simulation ◽  
Hydropower Generation ◽  
Blade Angle ◽  
Axis Direction ◽  
Electricity Power ◽  
Set Up ◽  
Sustainable Electricity ◽  
Distributed Forces ◽  
Small Capacity

Sustainable electricity power supply is crucial especially for less populated rural area. Micro hydropower generation in rural area is important in providing electricity especially in off-grid electricity area. This study aims to predict and harness power from micro hydropower generation through conical gravitational water vortex turbine (GWVT) via SOLIDWORKS flow simulation. Conical GWVT under study was designed as fully enclosed system with conical turbine basin. Two different turbine orientations were simulated i.e., vertical and horizontal at different blade angle designs i.e., 25°, 45°, 75°, 90°, and 120° and with different number of blades i.e., 8, 12, and 18 while forces were harnessed at tangential (z-axis) direction. The simulation results showed that it was possible to run and produce force from conical GWVT design in a fully enclosed system. It was found that vertical turbine orientation produced a slightly higher force than horizontally orientated turbine, using 12 runner blades at 90° angles where the distributed forces were 15.31N and 14.12N respectively, at tangential (z-axis) direction. The results are useful to predict turbine’s torque for small capacity micro hydropower electricity generation prior to actual conical GWVT set up, in rural area, to minimise cost implication and construction issues.

scholarly journals Study of the Effect of Bulb Ratio and Blade Angle on Propeller Turbine Performance in Horizontal Flow using Numerical Simulation

Teknik ◽  
2020 ◽  
Vol 41 (1) ◽  
pp. 9-13
Author(s):  
Akhmad Nurdin ◽  
Dwi Aries Himawanto ◽  
Syamsul Hadi
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Flow Simulation ◽  
Water Velocity ◽  
Horizontal Flow ◽  
Blade Angle ◽  
Static State ◽  
Turbine Performance ◽  
Solid Works

This paper discusses numerical simulations of horizontal flow propeller turbines. Static bulbs located before the turbine can be used to increase water velocity and potentially increase the turbine's performance. The blade angle affects the gap between the blades, and this will also affect the performance of the turbine. Numerical simulations were conducted by using software Solid Works Flow Simulation 2016 and by using five blades in a static state. This study aimed to determine the effect of the bulb ratio and blade angle on the propeller turbine characteristics on horizontal flow. Bulb Ratio variations used in this study were 0, 0.4, 0.6, and 0.8, while the angle variations used were 20, 25, and 30 degrees. Each variation was tested at 0.02 m3/second. The results of this study indicated that the bulb ratio 0.6 with the 25-degree blade angle produces the highest torque

scholarly journals An interferometric study of free convective heat transfer at an indoor glazing with an insect screen attachment

2021 ◽  
Author(s):  
Daniel Zalcman
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Flow Simulation ◽  
Cfd Models ◽  
Interferometric Study ◽  
Set Up ◽  
Screen Temperature ◽  
Good Agreement ◽  
Free Convective Heat Transfer

Free convective heat transfer from an idealized window with an insect screen attachment was studied using a Mach-Zehnder interferometer. An experimental model was set up with an isothermal plate, two commercially available screens (KHP=8.74×10-9 m2, tHP=0.29 mm and KLP=3.40×10-9 m2, tLP=0.65 mm) and window to screen spacings of b=2 cm and b=1 cm. Heat transfer measurements using finite fringe interferograms were taken at a Rayleigh number of Ra=5.30×107 based on window height. Infinite fringe interferograms were taken for temperature field visualization. Screen temperature was also measured. Experimental results were compared to a preliminary CFD model developed with SolidWorks Flow Simulation and show good agreement. The results show that an insect screen produces a reduction in the convective heat transfer from the indoor glazing. The current measurements show that the effect of window to screen spacing is small. Results from this study are expected to be used for the validation of CFD models and for the development of correlations.

A 3D Numerical Investigation on Droplets Distribution in a Wave-Plate Separator

2013 ◽  
Vol 842 ◽  
pp. 522-529
Author(s):  
Yong Lei Qu ◽  
Shi Bu ◽  
Bo Wan
Keyword(s):  
Gas Flow ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Geometrical Model ◽  
Turbulent Dispersion ◽  
Liquid Loading ◽  
Wave Plate ◽  
Gas Liquid Flow ◽  
Set Up ◽  
Plate Separator

The gas-liquid flow in a wave-plate separator is extremely complex due to its three-dimensional characteristic. Numerical simulation accomplished by former investigators using two-dimensional model may be appropriate for the iteration of pressure drop, but they were far from accurate in prediction of removal efficiency. To fill the gap, a three dimensional geometrical model of wave-plate separator is set up in this paper, RNG k-ε model is employed to compute the gas phase flow field, and the droplet trajectories were predicted applying the Lagrangian method. The turbulent dispersion of droplets were simulated by discrete random walk model. Using the assumption of a constant liquid loading of gas flow, simulation were accomplished for six different inlet velocities and two different droplet sizes. The influence pattern of gravity together with gas velocity on droplets distribution and the overall removal efficiencies were obtained.

The Application of Rotary Vane Expanders in Organic Rankine Cycle Systems—Thermodynamic Description and Experimental Results

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Zbigniew Gnutek ◽  
Piotr Kolasiński
Keyword(s):  
Power Systems ◽  
Thermodynamic Description ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Test Stand ◽  
Working Fluid ◽  
Cycle Systems ◽  
Set Up ◽  
Domestic Power ◽  
Small Capacity

Small (10–100 kW) and micro (0.5–10 kW) Organic Rankine Cycle (ORC) power systems are nowadays considered for local and domestic power generation. Especially interesting are micropower applications for heat recovery from dispersed low potential (85–150 °C) waste and renewable heat sources. Designing and implementing an ORC system dedicated to energy recovery from such a source is difficult. A proper working fluid must be selected together with a suitable expander. Volumetric machines can be adopted as a turbine alternative in small-capacity applications under development, like, e.g., domestic cogeneration. Scroll and screw expanders are a common choice. However, scroll and screw expanders are complicated and expensive. Vane expanders are mechanically simple, commercially available and cheap. This paper documents a study providing the preliminary analysis of the possibility of employing vane-expanders in mini-ORC systems. The main objective of this research was therefore a comprehensive analysis of the use of a vane expander for continuous operation with a low-boiling working fluid. A test-stand was designed and set up starting from system models based on thermodynamic analysis. Then, a series of experiments was performed using the test-stand. Results of these experiments are presented here, together with a model of multivane expanders and a thermodynamic-based method to select the working fluid. The analysis presented in this paper indicates that multivane expanders are a cheap and mechanically simple alternative to other expansion devices proposed for small-capacity ORC systems.

scholarly journals A HYBRID ENERGY SOLUTION FOR THE SUSTAINABLE ELECTRICITY SUPPLY OF AN IRRIGATION SYSTEM IN A RURAL AREA OF ZONA BANANERA, COLOMBIA

2021 ◽  
Vol 11 (4) ◽  
pp. 521-528
Author(s):  
Juan Camilo Barrera Hernández ◽  
Christian Moreno ◽  
Adalberto Ospino-Castro ◽  
Carlos Arturo Robles-Algarin ◽  
Juan Tobón-Perez
Keyword(s):  
Rural Area ◽  
Irrigation System ◽  
Energy Solution ◽  
Electricity Supply ◽  
Hybrid Energy ◽  
Sustainable Electricity

Model-based design of an agricultural biogas plant: application of Anaerobic Digestion Model No.1 for an improved four chamber scheme

2007 ◽  
Vol 55 (10) ◽  
pp. 21-28 ◽  
Author(s):  
B. Wett ◽  
M. Schoen ◽  
P. Phothilangka ◽  
F. Wackerle ◽  
H. Insam
Keyword(s):  
Anaerobic Digestion ◽  
Kinetic Modelling ◽  
A Priori ◽  
Decay Rates ◽  
Quality Data ◽  
Half Saturation Constant ◽  
Order Of Magnitude ◽  
Set Up ◽  
Sensitive Parameters ◽  
Small Capacity

Different digestion technologies for various substrates are addressed by the generic process description of Anaerobic Digestion Model No. 1. In the case of manure or agricultural wastes a priori knowledge about the substrate in terms of ADM1 compounds is lacking and influent characterisation becomes a major issue. The actual project has been initiated for promotion of biogas technology in agriculture and for expansion of profitability also to rather small capacity systems. In order to avoid costly individual planning and installation of each facility a standardised design approach needs to be elaborated. This intention pleads for bio kinetic modelling as a systematic tool for process design and optimisation. Cofermentation under field conditions was observed, quality data and flow data were recorded and mass flow balances were calculated. In the laboratory different substrates have been digested separately in parallel under specified conditions. A configuration of four ADM1 model reactors was set up. Model calibration identified disintegration rate, decay rates for sugar degraders and half saturation constant for sugar as the three most sensitive parameters showing values (except the latter) about one order of magnitude higher than default parameters. Finally, the model is applied to the comparison of different reactor configurations and volume partitions. Another optimisation objective is robustness and load flexibility, i.e. the same configuration should be adaptive to different load situations only by a simple recycle control in order to establish a standardised design.

scholarly journals KANDUNGAN KADMIUM DI DALAM WORTEL, BAWANG PREI DAN BUNCIS YANG DITANAM PADA TANAH BERBAHAN INDUK KAPUR DAN VOLKANIK DENGAN DOSIS PUPUK P YANG BERBEDA

AGRICA ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 132-141
Author(s):  
Charly Mutiara
Keyword(s):  
Soil Type ◽  
Block Design ◽  
Cadmium Content ◽  
Organic C ◽  
Random Block ◽  
P Fertilizer ◽  
Electricity Power ◽  
Standard Set ◽  
Random Block Design ◽  
Set Up

This study aims at investigating the content of cadmium on carrots, leeks, and string bean grown on limestone and volcanic soil with different dose of P Fertilizer and comparing the contents with cadmium content standardized by FAO/WHO. This pot test employed random block design and was a factorial test with three factors, namely factor of plant species, soil type, and fertilizer dose with three repeated tests. The levels of each factor are plants species consisting of Carrot (C1), leek (C2), and string bean (C3); soil type comprises of Andosol Nduaria (S1), MollisolFatumnasi (S2), VertisolOesao (S3) and MollisolBaumata (S4) and the fertilization consists of three levels of P fertilizer, namely 100 kg SP-36 per ha (F3), 50 kg SP-36 per ha (F2) and without P fertilizer (F1). The result of this study shows that the prediction model of cadmium content on the carrot, leek, and string bean based on cadmium, pH, electricity power, and land organic C content cannot be revealed in this study since the cadmium content cannot be detected by AAS. Moreover, the cadmium content on the carrot, leek, and string bean planted on four soil types and given different doses of P Fertilizer are under the standard set up by FAO/WHO (<0,05-01 mg kg-1).

scholarly journals An interferometric study of free convective heat transfer at an indoor glazing with an insect screen attachment

2021 ◽  
Author(s):  
Daniel Zalcman
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Flow Simulation ◽  
Cfd Models ◽  
Interferometric Study ◽  
Set Up ◽  
Screen Temperature ◽  
Good Agreement ◽  
Free Convective Heat Transfer

Free convective heat transfer from an idealized window with an insect screen attachment was studied using a Mach-Zehnder interferometer. An experimental model was set up with an isothermal plate, two commercially available screens (KHP=8.74×10-9 m2, tHP=0.29 mm and KLP=3.40×10-9 m2, tLP=0.65 mm) and window to screen spacings of b=2 cm and b=1 cm. Heat transfer measurements using finite fringe interferograms were taken at a Rayleigh number of Ra=5.30×107 based on window height. Infinite fringe interferograms were taken for temperature field visualization. Screen temperature was also measured. Experimental results were compared to a preliminary CFD model developed with SolidWorks Flow Simulation and show good agreement. The results show that an insect screen produces a reduction in the convective heat transfer from the indoor glazing. The current measurements show that the effect of window to screen spacing is small. Results from this study are expected to be used for the validation of CFD models and for the development of correlations.

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