Read Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122

Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122

With Other Selected and Abstracted Papers

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Description:Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122: With Other Selected and Abstracted Papers As early as forty years ago, Cornish boilers capable of evapo rating 10 lbs. Of water per lb. Of Welsh steam coal were made, and were used for supplying steam to Cornish pumping-engines, producing one i.hp. Per hour with a consumption of 1 8 lb. Of Welsh coal, at a boiler-pressure not exceeding 40 lbs. Per square inch. The weight of steam per i.hp. Per hour does not always represent the true economy of the engine, because it may be that, in order to secure the highest economy, the size, friction, first cost, and cost of maintenance of the engine have been largely increased. Compound Cornish engines were constructed as early as 1845, but it was found that with the boiler-pressure then available, viz., 40 lbs. Per square inch, no better duty was obtained from them than from the single-cylinder engines. The compound engine became a success when higher boiler-pressure and therefore greater ranges of expansion became practicable, and the triple-expansion engine succeeded the compound engine in the same way. There are well-known practical reasons for increasing the number of cylinders at higher pressures and greater ranges of expansion. In order to determine the relative efficiencies of different types of engines it is necessary to have a standard of comparison. The efiiciency of a steam-engine may be expressed by the number of units of heat expended to develop a given quantity of work, but in practice such a statement afi'ords no measure of the quality of the machine as a steam-engine, because in it the conditions under which the engine works are not considered. Higher pressure and greater range of expansion produce greater economy, other things being equal. Therefore, in comparing the construction of one steam-engine with that of another, a basis of comparison must be established which will show how the other conditions vary if they are not equal, and it is with the Object of drawing such a com parison that the Paper has been prepared. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122. To get started finding Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122, you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122: With Other Selected and Abstracted Papers As early as forty years ago, Cornish boilers capable of evapo rating 10 lbs. Of water per lb. Of Welsh steam coal were made, and were used for supplying steam to Cornish pumping-engines, producing one i.hp. Per hour with a consumption of 1 8 lb. Of Welsh coal, at a boiler-pressure not exceeding 40 lbs. Per square inch. The weight of steam per i.hp. Per hour does not always represent the true economy of the engine, because it may be that, in order to secure the highest economy, the size, friction, first cost, and cost of maintenance of the engine have been largely increased. Compound Cornish engines were constructed as early as 1845, but it was found that with the boiler-pressure then available, viz., 40 lbs. Per square inch, no better duty was obtained from them than from the single-cylinder engines. The compound engine became a success when higher boiler-pressure and therefore greater ranges of expansion became practicable, and the triple-expansion engine succeeded the compound engine in the same way. There are well-known practical reasons for increasing the number of cylinders at higher pressures and greater ranges of expansion. In order to determine the relative efficiencies of different types of engines it is necessary to have a standard of comparison. The efiiciency of a steam-engine may be expressed by the number of units of heat expended to develop a given quantity of work, but in practice such a statement afi'ords no measure of the quality of the machine as a steam-engine, because in it the conditions under which the engine works are not considered. Higher pressure and greater range of expansion produce greater economy, other things being equal. Therefore, in comparing the construction of one steam-engine with that of another, a basis of comparison must be established which will show how the other conditions vary if they are not equal, and it is with the Object of drawing such a com parison that the Paper has been prepared. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122. To get started finding Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122

Minutes of Proceedings of the Institution of Civil Engineers, Vol. 122

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