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Download Aquaculture Engineering by Odd-Ivar Lekang PDF

By Odd-Ivar Lekang

ISBN-10: 0470670851

ISBN-13: 9780470670859

As aquaculture maintains to develop at a quick speed, knowing the engineering in the back of aquatic creation amenities is of accelerating significance for all these operating within the undefined. Aquaculture engineering calls for wisdom of the various normal features of engineering reminiscent of fabric expertise, construction layout and building, mechanical engineering, and environmental engineering. In this comprehensive booklet now in its moment version, writer Odd-Ivar Lekang introduces those ideas and demonstrates how such technical wisdom may be utilized to aquaculture systems.Review of the 1st variation: 'Fish farmers and different body of workers fascinated by the aquaculture undefined, providers to the fish farming company and architects and brands will locate this publication a useful source. The publication should be a big addition to the cabinets of all libraries in universities and examine associations the place aquaculture, agriculture and environmental sciences are studied and taught.'Aquaculture Europe'A worthy booklet that, expectantly, will motivate successors that spotlight extra on hot water aquaculture and on large-scale mariculture similar to tuna farming.'Cision

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Extra resources for Aquaculture Engineering

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Is 9 m (H1). Calculate the new flow rate (Q2) and the new head (H2). Q2 /Q1 = d2 / d1 Q2 = Q1 ( d2 / d1 ) Q2 = 700 × ( 555/515 ) Q2 = 754 L / s H 2 /H1 = ( d2 / d1 ) 2 Change of impeller (pump wheel) H 2 = H1 ( d2 / d1 ) Most centrifugal pumps can be supplied with ­different impellers. 19). In this way it is possible to find an impeller that is better adjusted to the working point of the pump, and better ­efficiency can be achieved. The following relationships can be used to show pump performance when reducing or increasing the diameter of the impeller: H 2 = 9 × ( 555/515 ) Q2 / Q1 = d2 / d 1 H 2 / H1 = ( d2 / d1 ) 2 P2 / P1 = ( d2 / d1 ) 3 where d2 represents the diameter of the smallest impeller, d1 the diameter of the largest impeller, Q flow rate, H head and P power requirement.

2 Inlet water As the aquaculture industry becomes ever more intensive, the focus on water quality in the rearing units will also increase. Higher production densities will also increase the requirements for optimal water quality, because of the degeneration in quality when water flows through the production unit. The importance of water quality is independent of the type of rearing unit and location of the production facilities. If using open production units in the sea such as sea cages, it will of course be more difficult to treat the water to improve quality, even though this is starting to happen (see Chapter 12 concerning oxygenation in open sea cages).

The same thing can happen if the frequency is increased to above 50 Hz. The disadvantage of this system is that frequency regulators are quite expensive and some energy loss occurs during frequency transformation. However, great technological improvements have been made in this field during the past few years, which have led to costs being considerably reduced and energy losses highly reduced. Example A pump delivers 300 L/s. The speed of the pump motor must be changed so that the pump only ­delivers 200 L/s.

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