scholarly journals RANCANG BANGUN PROTOTYPE HYDRO TURBINE JENIS CROSS-FLOW UNTUK PERKOTAAN

POROS ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 43
Author(s):  
Andrianus Andrianus ◽  
Steven Darmawan ◽  
Abrar Riza
Keyword(s):  
Urban Areas ◽  
Fossil Fuel ◽  
Electric Energy ◽  
Cross Flow ◽  
Small Scale ◽  
Outer Diameter ◽  
Hydro Turbine ◽  
Good Shape ◽  
Water Turbine ◽  
The Right

The problem of fossil fuel crisis, both petroleum and coal, and the phenomenon of climatechange due to global warming, trigger the use of renewable energy that can overcome these problems.Cross-flow water turbine is one of the machine that can be used to produce small scale electric energy insmall scope. This turbine can be used in urban areas to assist industrial activities and their usefulness indaily life. The use of the right materials and strong construction can produce a good shape so that thiswater turbine is not only make efficient energy but also efficient and ergonomic in its use. This study isconducted theoretically to a cross-flow turbine which assumed to operate at 10m water height with 1.4L/s, outer diameter 150mm and 75mm thickness. The turbine consist of 15 blades with angle of attack ofthe blades is 30o. The results show that the turbine generate 119 Watt

scholarly journals Experimental investigation of Archimedes Screw Hydro Turbine rotation with and without deflector

2021 ◽  
Vol 926 (1) ◽  
pp. 012013
Author(s):  
Y Setiawan ◽  
E S Wijianti ◽  
B S Wibowo ◽  
S Saparin ◽  
P Prayitnoadi
Keyword(s):  
Electrical Energy ◽  
Small Scale ◽  
Outer Diameter ◽  
Hydro Turbine ◽  
Turbine Performance ◽  
Screw Length ◽  
Water Turbine ◽  
Low Head ◽  
Pitch Distance ◽  
Hydro Turbines

Abstract The Archimedes screw water turbine (AST) is a device that works mechanically to produce electrical energy with an energy source that comes from the flow of water. Archimedes screw hydro turbines operate at low head and flow rates and can generate electricity at micro levels. This type of turbine is very suitable for use in small waters such as irrigation and rivers. The research was conducted by building a prototype of a small-scale Archimedes screw hydro turbine with and without deflector. The purpose of this research is to compare the rotation produced by the two turbines and whether the installation of a deflector can improve turbine performance. The turbine is constructed with a screw length of 1 m, outer diameter is 30 cm, the number of blades 15, and each has a pitch distance is 13 cm. Turbine angle variations are 30°, 35°, and 40°. The results showed that the best rotor rotation was produced by the screw without deflector at an angle of 30°. This shows that the addition of a deflector reduces the resulting screw rotation.

scholarly journals Performance test of Pikohidro Cross flow Water Turbine using multilevel double penstock

Teknomekanik ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 76-80
Author(s):  
Purwantono Purwantono ◽  
Bahrul Amin ◽  
Abdul Aziz ◽  
Jasman Jasman ◽  
Andre Kurniawan
Keyword(s):  
Water Flow ◽  
Performance Test ◽  
Flow Analysis ◽  
Cross Flow ◽  
Water Velocity ◽  
Small Scale ◽  
Excess Water ◽  
Water Turbine ◽  
The Stability ◽  
Turbine Construction

This study aims to examine the performance of pico hydro scale cross flow water turbines using multilevel double penstock as a conductor of water flow.  Multilevel double penstock is used to reduce the transportation process from highways that are affordable to four-wheeled vehicles / cars to the location of the installation of the turbine.  This condition causes the need for small-scale water turbine designs with lightweight construction with a kock down system.  Overall the picohidro scale turbine construction is needed relatively cheaper transportation costs, so that people who have not been reached by the PLN network can be touched by small and cheap electricity. Turbine construction data has a runner diameter of 170 mm, body dimensions 200 mm x 300 mm x 250 mm, frame 250 mm x 800 mm. Pool tando 600 mm x 1200 mm and penstock length 16m. The power produced is theoretically around 2500 watts, with a data flow of 50 liters / second and a water level of 8 m. 65% efficiency. The research method is analyzing the double penstock water flow, by making paralon pipes in stages, ranging from 5 incci diameter, 4 inches and 3 inches, flow analysis approach using a gradient line, where the incoming water velocity and water velocity come out until entering the transmitting pipe. The performance results of this turbine provide an average actual power of up to 2000 watts. The stability of the inlet water condition is used by the Tando pond as a water bath. If there is excess water in the sediment tank, the water gate is used out, where excess water will automatically flow into the exhaust channel.

scholarly journals Study on an Undershot Cross-Flow Water Turbine with Straight Blades

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Yanrong Li ◽  
Kentaro Hatano
Keyword(s):  
Flow Field ◽  
Output Power ◽  
Cross Flow ◽  
Open Channels ◽  
Small Scale ◽  
Hydroelectric Power ◽  
Turbine Efficiency ◽  
Water Turbine ◽  
Low Head ◽  
Hydroelectric Power Generation

Small-scale hydroelectric power generation has recently attracted considerable attention. The authors previously proposed an undershot cross-flow water turbine with a very low head suitable for application to open channels. The water turbine was of a cross-flow type and could be used in open channels with the undershot method, remarkably simplifying its design by eliminating guide vanes and the casing. The water turbine was fitted with curved blades (such as the runners of a typical cross-flow water turbine) installed in tube channels. However, there was ambiguity as to how the blades’ shape influenced the turbine’s performance and flow field. To resolve this issue, the present study applies straight blades to an undershot cross-flow water turbine and examines the performance and flow field via experiments and numerical analyses. Results reveal that the output power and the turbine efficiency of the Straight Blades runner were greater than those of the Curved Blades runner regardless of the rotational speed. Compared with the Curved Blades runner, the output power and the turbine efficiency of the Straight Blades runner were improved by about 31.7% and about 67.1%, respectively.

AERODYNAMIC MODELS APPROXIMATE FOR ESTIMATING THE BLADE PERFORMANCE OF A DARRIEUS-TYPE CROSS-FLOW WATER TURBINE

2020 ◽  
Vol 47 (1) ◽  
pp. 85-98
Author(s):  
Fatima Meddane ◽  
Tayeb Yahiaoui ◽  
Omar Imine ◽  
Lahouari Adjlout
Keyword(s):  
Cross Flow ◽  
Water Turbine

The Application of Organic Plant Media Composition on Indian Mustard Crops (Brassica Juncea L) in Polybag

2019 ◽  
Vol 1 (1) ◽  
pp. 16-22
Author(s):  
Nora Augustien ◽  
Pawana Nur Indah ◽  
Purnawati Arika ◽  
Irsyad Irsyad ◽  
Hadi Suhardjono
Keyword(s):  
Urban Communities ◽  
Urban Areas ◽  
Indian Mustard ◽  
Vegetable Crops ◽  
Sustainable Food ◽  
Mustard Plant ◽  
Soil Media ◽  
Wet Weight ◽  
Number Of Leaves ◽  
The Right

Indian mustard plants are the main vegetable crops consumed by urban communities. The need for this vegetable increases along with the increase in culinary tourism in each region and the government's appeal on sustainable food home. One effort made to meet the needs of vegetable mustard in urban areas can be cultivated using polybags. The main problem of vegetable cultivation on polybags is the availability of soil media. To overcome the limitations of soil media it is attempted to substitute it with organic litter enriched with MOL (local microorganisms). The purpose of research is to find the right combination of planting media for mustard plants. The results showed that the composition of K7 = soil: compost: litter of hay: litter of maize (2: 1: 1: 1) best on plant length, number of leaves, length of root leaves and number of roots while the wet weight of mustard plant (g) K7 = soil: compost: litter of maize: litter of corn (2: 1: 1: 1) and K8 = soil: compost: litter of maize: litter of maize: cocopeat (2: 1: 1: 1: 1) or soil: compost + urea. Increased weights of wet mustard by 63% compared to soil media and 20% compared to soil composition: compost + urea. Organic straw in the form of straw: litter of corn stalk: cocopeat enriched with MOL are able to become ready-made planting media on the cultivation of indian mustard plants in polybags.

Design and Operation of Small Wastewater Treatment Plants by the Microbial Film Process

1990 ◽  
Vol 22 (3-4) ◽  
pp. 139-144 ◽  
Author(s):  
S. Iwai ◽  
Y. Oshino ◽  
T. Tsukada
Keyword(s):  
Urban Areas ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Small Scale ◽  
Small Communities ◽  
Fishing Villages ◽  
Sewer Systems ◽  
Water Treatment Plants ◽  
History Of ◽  
Microbial Film

Although the ratio of sewer systems to population in Japan has been improving in recent years, the construction of sewer systems in small communities such as farming or fishing villages, etc. had lagged behind that of urban areas. However, construction of small-scale sewer systems in farming and fishing villages has been actively carried out in recent years. This report explains the history of the promotion of small-scale sewer systems, why submerged filter beds are being employed in many cases, and introduces the design, operation and maintenance of representative waste-water treatment plants in farming and fishing villages which incorporate de-nitrogen and dephosphorization.

Water for Life

2017 ◽  
Author(s):  
Madeline Baer
Keyword(s):  
Human Rights ◽  
Citizen Participation ◽  
Urban Areas ◽  
Water Policy ◽  
State Capacity ◽  
National Level ◽  
Human Right ◽  
Political Will ◽  
Water And Sanitation ◽  
The Right

Chapter 5 provides a case study of the human rights-based approach to water policy through an analysis of the Bolivian government’s attempts to implement the human right to water and sanitation. It explores these efforts at the local and national level, through changes to investments, institutions, and policies. The analysis reveals that while Bolivia meets the minimum standard for the human right to water and sanitation in some urban areas, access to quality water is low in poor and marginalized communities. While the Bolivian government expresses a strong political will for a human rights approach and is increasing state capacity to fulfill rights, the broader criteria for the right to water and sanitation, including citizen participation and democratic decision-making, remain largely unfulfilled. This case suggests political will and state capacity might be necessary but are not sufficient to fulfill the human right to water and sanitation broadly defined.

scholarly journals Canard optimization for enhancing the performance of small horizontal axis wind turbine at low wind speeds

2020 ◽  
Vol 37 ◽  
pp. 63-71
Author(s):  
Yui-Chuin Shiah ◽  
Chia Hsiang Chang ◽  
Yu-Jen Chen ◽  
Ankam Vinod Kumar Reddy
Keyword(s):  
Wind Turbine ◽  
Urban Areas ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Peak Performance ◽  
Small Scale ◽  
Horizontal Axis Wind Turbine ◽  
Wind Speeds ◽  
Optimum Parameters ◽  
Low Wind Speeds

ABSTRACT Generally, the environmental wind speeds in urban areas are relatively low due to clustered buildings. At low wind speeds, an aerodynamic stall occurs near the blade roots of a horizontal axis wind turbine (HAWT), leading to decay of the power coefficient. The research targets to design canards with optimal parameters for a small-scale HAWT system operated at variable rotational speeds. The design was to enhance the performance by delaying the aerodynamic stall near blade roots of the HAWT to be operated at low wind speeds. For the optimal design of canards, flow fields of the sample blades with and without canards were both simulated and compared with the experimental data. With the verification of our simulations, Taguchi analyses were performed to seek the optimum parameters of canards. This study revealed that the peak performance of the optimized canard system operated at 540 rpm might be improved by ∼35%.

scholarly journals Analysis of the Particulate Matter Pollution in the Urban Areas of Croatia, EU

2020 ◽  
Vol 4 (1) ◽  
pp. 9
Author(s):  
Martina Habulan ◽  
Bojan Đurin ◽  
Anita Ptiček Siročić ◽  
Nikola Sakač
Keyword(s):  
Particulate Matter ◽  
Urban Areas ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Electric Energy ◽  
Two Cities ◽  
Adriatic Coast ◽  
Pm2.5 And Pm10 ◽  
Autumn And Winter ◽  
Particulate Matter Pollution

Particulate matter (PM) comprises a mixture of chemical compounds and water particles found in the air. The size of suspended particles is directly related to the negative impact on human health and the environment. In this paper, we present an analysis of the PM pollution in urban areas of Croatia. Data on PM10 and PM2.5 concentrations were measured with nine instruments at seven stationary measuring units located in three continental cities, namely Zagreb (the capital), Slavonski Brod, and Osijek, and two cities on the Adriatic coast, namely Rijeka and Dubrovnik. We analyzed an hourly course of PM2.5 and PM10 concentrations and average seasonal PM2.5 and PM10 concentrations from 2017 to 2019. At most measuring stations, maximum concentrations were recorded during autumn and winter, which can be explained by the intensive use of fossil fuels and traffic. Increases in PM concentrations during the summer months at measuring stations in Rijeka and Dubrovnik may be associated with the intensive arrival of tourists by air during the tourist season, and lower PM concentrations during the winter periods may be caused by a milder climate consequently resulting in lower consumption of fossil fuels and use of electric energy for heating.

scholarly journals The importance of changing urban scenery in the assessment of citizens’ soundscape perception. On the need for different time-related points of view

Noise Mapping ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 138-161
Author(s):  
Jerónimo Vida Manzano ◽  
José Antonio Almagro Pastor ◽  
Rafael García Quesada
Keyword(s):  
Urban Areas ◽  
Noise Exposure ◽  
Noise Control ◽  
Action Plan ◽  
Heavy Traffic ◽  
Legal Protection ◽  
Complementary Method ◽  
Reduction Strategies ◽  
The Right ◽  
The City

Abstract The city of Granada is experimenting a big urban transformation, attending national and international commitments on clean air, energy efficiency and savings linked to greenhouse gases reduction strategies and sustainable development action plans. This situation constitutes a good scenario for new noise control approaches that take into account the sound variable and citizens empowering in urban design, such as the soundscape assessment of urban territory. In this way, soundscape tools have been used in Granada as a complementary method for environmental noise characterisation where traditional noise control techniques are difficult to be carried out or give limited results. After 2016 strategic noise map and in the preparation of the new noise action plan, the city came across a great acoustic challenge in a new area located outskirts characterised by growing urbanisation, still under development, the greatest legal protection because of sensitive teaching and hospital buildings and the greatest noise exposure from nearby ring-way supporting heavy traffic flow. As quiet urban areas are not characterised by the absence of noise but for the presence of the right noise, this research intended to provide the local administration with results and proposals to transform this conflict area in a pleasant or quiet urban place. Main results came from important and significative differences in morning and evening characterisation, as great differences appear in soundscape assessment over the day and along the soundwalk path, indicating the importance of time and local issues to adequately characterised citizens perception to be considered by administration in the development of strategies and effective noise control actions.

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