scholarly journals Economic Analysis on Design of a Simple Hydraulic Reaction Type Turbine for Low-Head Low-Flow Pico Hydro

2019 ◽  
Vol 9 (2) ◽  
pp. 3876-3980
Keyword(s):  
Water Resources ◽  
Economic Analysis ◽  
Manufacturing Process ◽  
Low Flow ◽  
Generation System ◽  
Reaction Type ◽  
Fabrication Cost ◽  
Water Turbine ◽  
Low Head ◽  
Type Water

The purpose of this paper is to establish a techno-economic analysis on the design of a new Z-Blade turbine focusing on problems of costing and manufacturing process which focus on a low-head and low-flow pico hydro. Pico hydro generation system with a capacity less than 5kw has been gaining increasing attention as preferred methods of clean power generation. Accordingly, the design and operating procedures as well as economic analysis for a Z-Blade reaction type turbine are described in detail. Furthermore, the constructive analysis of the literature on the simple reaction type water turbine are discuss through quantitative summarization, classification, costing and comparison. In this paper also, will re-evaluated the manufacturing process of the SRT and CPT based on techno-economic analysis and the disadvantages of both turbines are identified. Meanwhile, the additional features of Z-Blade will be investigated under low-head low-flow water resources with simple geometrical design and low fabrication cost. Ideally, this hydro generation system is inexpensive and has a simple fabrication method with costing estimation at only USD76, which comprises 7.6% of total cost of hydro-electric installation and capable of producing mechanical power up to 115W under low-head and low-flow water resources.

EVOLUTION OF SIMPLE REACTION TYPE TURBINES FOR PICO-HYDRO APPLICATIONS

2015 ◽  
Vol 77 (32) ◽  
Author(s):  
M.B. Farriz ◽  
H. Boejang ◽  
M. Masjuri ◽  
M.S.M. Aras ◽  
N.H.A. Razik ◽  
...  
Keyword(s):  
Water Resources ◽  
Low Flow ◽  
Manufacturing Processes ◽  
Reaction Type ◽  
Simple Reaction ◽  
Low Head ◽  
The Cross ◽  
Type Water ◽  
Water Turbines ◽  
Different Levels

This paper aims to explore the history and development of eight types of reaction water turbines, namely Hero’s turbine, Barker’s mill, Pupil’s turbine, Whitlaw’s mill, Quek’s turbine, the cross pipe turbine, the split reaction turbine and the Z-Blade turbine. These water turbines are discussed in terms of the complexity of the designs, the manufacturing processes involved, and the applications. It has been observed that even though most reaction type water turbines, except for the split reaction turbine and Z-blade turbine, have undergone different levels of design-related modifications and manufacturing processes, they are considered as being unsuitable for low-head and low-flow water resources in pico-hydro systems.

scholarly journals Performance Analysis of Z-Blade Reaction Type Turbine for Low-Head Low Flowrate Pico Hydro

2021 ◽  
Vol 85 (2) ◽  
pp. 51-65
Author(s):  
Mohd Farriz Basar ◽  
Fatin Syakira Mohd Hassan ◽  
Nurul Ashikin Rais ◽  
Izzatie Akmal Zulkarnain ◽  
Wan Azani Wan Mustafa
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Rotational Speed ◽  
Low Flow ◽  
Practical Case ◽  
Reaction Type ◽  
K Factor ◽  
Water Turbine ◽  
Low Head

The study explores the performance characteristics of a Z-Blade reaction type water turbine and investigates a test unit for an ideal and practical case using the governing equations derived from the principles of conservation of mass, momentum, and energy. Various analyses are conducted with consideration of the ideal and possible operating condition for low-head (3 m to 5 m) and low-flow (2.5 L/sec and below) water resources. The relationship of the fluid flow friction known as k-factor with mass flow rate and angular velocity for a Z-Blade turbine model is discussed. The measured performance of two PVC pipe sizes (0.5 inch and 1 inch) of a Z-Blade turbine is presented and evaluated against theoretical results. This work also describes the simple concept of a Z-Blade turbine for a pico-hydro application. A large variation in k-factor with a 1% difference in rotational speed and mass flow rate is presented. The coefficient k-factor is also demonstrated as a strong parameter influencing the mass flow rate and rotational speed performance. This coefficient also has a significant impact on the conversion of potential energy into power output.

scholarly journals Performance and Flow Field of a Gravitation Vortex Type Water Turbine

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Terumi Inagaki
Keyword(s):  
Free Surface ◽  
Flow Field ◽  
Simple Structure ◽  
Low Flow ◽  
Flow Area ◽  
Turbine Efficiency ◽  
Water Turbine ◽  
Low Head ◽  
Type Water ◽  
Turbine Output

A gravitation vortex type water turbine, which mainly comprises a runner and a tank, generates electricity by introducing a flow of water into the tank and using the gravitation vortex generated when the water drains from the bottom of the tank. This water turbine is capable of generating electricity using a low head and a low flow rate with relatively simple structure. However, because its flow field has a free surface, this water turbine is extremely complicated, and thus its relevance to performance for the generation of electricity has not been clarified. This study aims to clarify the performance and flow field of a gravitation vortex type water turbine. We conducted experiments and numerical analysis, taking the free surface into consideration. As a result, the experimental and computational values of the torque, turbine output, turbine efficiency, and effective head agreed with one another. The performance of this water turbine can be predicted by this analysis. It has been shown that when the rotational speed increases at the runner inlet, the forward flow area expands. However, when the air area decreases, the backward flow area also expands.

Study on the Flow Field of an Undershot Cross-Flow Water Turbine

2014 ◽  
Vol 620 ◽  
pp. 285-291 ◽  
Author(s):  
Yan Rong Li ◽  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Kentarou Hatano
Keyword(s):  
Free Surface ◽  
Flow Field ◽  
Water Depth ◽  
Open Channel ◽  
Rotation Speed ◽  
Cross Flow ◽  
Water Turbine ◽  
Low Head ◽  
New Type ◽  
Type Water

The purpose of this investigation is to research and develop a new type water turbine, which is appropriate for low-head open channel, in order to effectively utilize the unexploited hydropower energy of small river or agricultural waterway. The application of placing cross-flow runner into open channel as an undershot water turbine has been under consideration. As a result, a significant simplification was realized by removing the casings. However, flow field in the undershot cross-flow water turbine are complex movements with free surface. This means that the water depth around the runner changes with the variation in the rotation speed, and the flow field itself is complex and changing with time. Thus it is necessary to make clear the flow field around the water turbine with free surface, in order to improve the performance of this type turbine. In this research, the performance of the developed water turbine was determined and the flow field was visualized using particle image velocimetry (PIV) technique. The experimental results show that, the water depth between the outer and inner circumferences of the runner decreases as the rotation speed increases. In addition, the fixed-point velocities with different angles at the inlet and outlet regions of the first and second stages were extracted.

scholarly journals A Novel Z-blade Reaction Type Turbine for Low Head Low Flow Water Condition

2020 ◽  
Vol 9 (3) ◽  
pp. 1370-1374
Keyword(s):  
Flow Rate ◽  
High Efficiency ◽  
Water Flow Rate ◽  
Low Flow ◽  
Practical Case ◽  
Hydro Power ◽  
Small Stream ◽  
Reaction Type ◽  
Water Condition ◽  
Low Head

This paper discusses the performance characteristics on efficiency and applicability of the test unit under low-head and low-flow condition for a novel Z-blade reaction type hydraulic turbine. Unlike large hydro power system, this technology’s superiority lies in the fact that it can harness electrical energy even from a small stream of water as energy sources and it does not poses any adverse environmental impact. This turbine was developed for an ideal and practical case which investigated applying the principal equations that were derived using the philosophies of conservation of mass, momentum, and energy. Assuming frictional losses factor or k-factor for different operating head, the relationship between rotor diameter, angular speed, flow rate, and power output was plotted and elaborated with allusion to the experimental data. Experiments were carried out at 5m head and below with the water flow rate less than 2.5L/sec, and it was evaluated against theoretical results. The turbine has a capability to achieve high values of rotational speed (up to 500 rpm) with minimal mass flow rate and high efficiency (up to 78%) at low head water condition (5m).

scholarly journals Design of Low Flow Undershot Type Water Turbine

2019 ◽  
Vol 2 (2) ◽  
pp. 50 ◽  
Author(s):  
E. Y. Setyawan ◽  
S. Djiwo ◽  
D. H. Praswanto ◽  
P Suwandono ◽  
P. Siagian
Keyword(s):  
Energy Source ◽  
Flow Velocity ◽  
Power Efficiency ◽  
River Flow ◽  
Low Flow ◽  
Simple Design ◽  
Computational Power ◽  
Water Turbine ◽  
Type Water ◽  
The Stability

Many water sources around us which have kinetic energy to run waterwheels are not optimally utilized. This energy can be converted into an energy source that can produce electricity. Therefore this study produced a design of a waterwheel that could be used in low-flow rivers to produce electricity by adding generators. Waterwheel modeling using Ansys is calculated based on flow assumptions. Modeling using this system provides advantages in the form of computational power efficiency, the stability of numerical calculations and the accuracy of the resulting solutions. Numerical analysis of the waterwheel is assumed that the waterwheel is half floating on the surface of the water. As stated in the limitation of the problem that the incoming water flowing at a speed of 5 m/s from the flow moves the wheel. The flow rate of water that hit the blade on the waterwheel causes the waterwheel to rotate which is pressured by the flow of water with a number of 12 blades. With a relatively simple design, the waterwheel produces a wheel rotation I of 91 Rpm and II of 78 Rpm, with a torque of 39.2 N by using some analysis of this design can be applied to river flow with low flow velocity. The relatively simple design makes it easy to be produced and maintenance. River flow used is in the Malang District with a flow velocity of 1 m/s gets a power of 1128 W on waterwheel I while on waterwheel II gets a power of 967 W.

scholarly journals Optimization of Reaction Typed Water Turbine in Very Low Head Water Resources for Pico Hydro

2021 ◽  
Vol 90 (1) ◽  
pp. 23-39
Author(s):  
Mohd Farriz Basar ◽  
Nurul Ashikin M Rais ◽  
Azhan Ab Rahman ◽  
Wan Azani Mustafa ◽  
Kamaruzzaman Sopian ◽  
...  
Keyword(s):  
Flow Rate ◽  
Nozzle Exit ◽  
Water Flow Rate ◽  
High Water ◽  
Angular Speed ◽  
Low Flow ◽  
Substantial Impact ◽  
Static Water ◽  
Water Turbine ◽  
Low Head

The purpose of this research is to investigate the dominant parameters that influence the optimum performance of reaction typed turbine at very low water head. The concepts of conservation of mass, momentum and energy are utilised to explore performance characteristics using a graphical technique. Parametric analysis of the governing equation and experimental results were performed to show that the turbine diameter and nozzle exit area has a dynamic response to mass flow rate, angular speed, output power and efficiency. Depending on the nozzle diameter of (0.01 m, 0.006 m, and 0.008 m) and turbine pipe size with (diameter of 0.025 m and 0.015 m), six versions of prototype turbine Z-blade turbine were produced. All the turbines have been tested at 100 kPa static water pressures and below. According to a variety of experimental data for all types of turbines, the turbine diameter and nozzle exit area have a substantial impact on turbine performance, especially at high water heads. Despite differences in turbine length and nozzle exit area, more than 90 % of the pattern curves for rotational speed, water flow rate, and mechanical power were identical. Overall, the Z-blade turbine Type B outperforms, resulting in higher turbine efficiency at low head and low flow water condition.

Performance and Flow Field of Gravitation Vortex Type Water Turbine using Volute Tank

2021 ◽  
Vol 14 (3) ◽  
pp. 229-246
Author(s):  
Yasuyuki Nishi ◽  
Daichi Sukemori ◽  
Terumi Inagaki
Keyword(s):  
Flow Field ◽  
Water Turbine ◽  
Type Water
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