The efficiency of overshot and undershot waterwheels

Denny, Mark

doi:10.1088/0143-0807/25/2/006

Cited by 62 publications

(44 citation statements)

References 2 publications

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“…It is not clear where it had its origin; it is clear however that it rapidly spread out as described by Roman, Greek and Chinese sources. There is evidence that the familiar vertical waterwheel developed within the Roman Empire and rapidly spread out; the undershot waterwheel was more common (Denny, 2003). Overshot wheels required a large head (2 -10 m), therefore they were usually confined to hilly areas, or required extensive and expensive auxiliary constructions.…”

Section: Introductionmentioning

confidence: 99%

“…4 The relation P = γAV 2 is a classical results of dynamics of fluids. To this purpose see (Denny, 2003) where also the analysis of the overshot wheel is reported. Although Parent's analysis was idealised, its results were adopted by many scientists of the 18 th century such as John Theophilus Desaguliers (1683Desaguliers ( -1744, Colin Maclaurin (1698-1746) (Smeaton, 1776: pp.…”

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confidence: 99%

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Over and Undershot Waterwheels in the 18th Century. Science-Technology Controversy

Capecchi¹

2013

AHS

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The present paper concerns the development of theory and experiments on water wheels in the 18 th century. At that time, as a result of a growing demand for energy, a better understanding of the functioning of watermills, even at the theoretical level, was required in order to improve their efficiency. A hint about the evolution of the theory of wheels in the 19 th century is reported also. We have tried to clarify the role played by some protagonists as Antoine Parent, Jean-Charles de Borda and John Smeaton. Their role has not been fully recognised even in contemporary studies. Then some considerations are developed on the relationships between science and technology on this particular subject, concluding that it was a happy and well-balanced marriage.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Over and Undershot Waterwheels in the 18th Century. Science-Technology Controversy

Capecchi¹

2013

AHS

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“…Especially, in Ref. [19,[21][22][23]] a detailed work has been conducted on a breastshot, overshot and undershot waterwheels, presenting a modern theoretical model and experimental results. …”

Section: çüMühmimfakdergisi 31(1) Haziran 2016mentioning

confidence: 99%

“…Few model experiments have been described on undershot waterwheels nowadays. A literature review shows that the most advanced design method was carried out by Denny [22] and Senior et al [23].…”

Section: Undershot Waterwheelsmentioning

confidence: 99%

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Mikro-Hidroelektrik Teknolojileri ve Su Çarkı Sistemlerinin Tasarım Özelliklerine Genel Bir Bakış

Bilgili¹,

Özbek²

2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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In recent years, the global warming and efficient usage of energy sources are become most attractive issues. Furthermore, renewable energy technologies play an important role in addressing global energy and environmental challenges. Among the renewable energy technologies, hydropower is considered to be the most advanced and mature, providing some level of electricity generation in more than 160 countries worldwide. Micro-hydropower plant is in the category of small-scale hydropower projects, and it provides an affordable, reliable, economically viable, socially acceptable and environmentally energy alternative for rural area. In this article, micro-hydropower technologies, design and performance characteristics, power losses, mechanical powers and efficiencies for the waterwheel systems such as breastshot, overshot and undershot are reviewed in detail and compared each other. In addition, the development of worldwide hydropower capacity is discussed, and the top countries in terms of total installed capacity are reported and investigated.Keywords: Micro-hydropower, Waterwheels systems, Breastshot, Overshot, Undershot. Mikro-Hidroelektrik Teknolojileri ve Su Çarkı Sistemlerinin TasarımÖzelliklerine Genel Bir Bakış ÖzetSon yıllarda, küresel ısınma ve enerji kaynaklarının verimli kullanılması en cazip konular haline gelmiştir. Ayrıca, yenilenebilir enerji teknolojileri, küresel enerji ve çevre sorunları açısından önemli bir rol oynamaktadır. Yenilenebilir enerji teknolojileri arasında, hidroelektrik dünya çapında 160'tan fazla ülkede elektrik üretimini belli bir düzeyde sağlayarak, en gelişmiş ve olgun olarak kabul edilmektedir. Mikro hidroelektrik santrali küçük ölçekli hidroelektrik projelerin kategorisindedir ve kırsal alan için uygun fiyatlı, güvenilir, sosyal açıdan kabul edilebilir, ekonomik ve çevre açısından duyarlı bir enerji alternatifi olarak sunulmaktadır. Bu makalede, gövde çarpmalı, üstten çarpmalı ve alttan çarpmalı gibi su çarkı sistemleri için mikro hidroelektrik teknolojilerinin tasarım ve performans özellikleri, güç kayıpları,

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