Optimization of Feeding Schedules in Salmon Hatcheries
Article Abstract:
A methodology is developed that determines feeding schedules which will reduce total food consumption for coho salmon in a hatchery during the rearing period. The method presented assumes that the feeding level has a parabolic mathematical form with respect to time. Coefficients of this parabola are converged upon in such a way that the fish achieve a particular size on a chosen release date and simultaneously total food consumption for the rearing period is minimized. The indicator of feeding level chosen is a nondimensional parameter that equals one at the minimum feeding rate resulting in maximum growth rate and equals zero at a feeding rate that results in a zero growth rate. Results show that for long rearing periods corresponding to rearing in unheated water, the feeding level should be low initially and gradually increase towards the end of the rearing period. Conversely, for rearing periods simulating the accelerated growth periods that occur in heated hatcheries, feeding levels should in general be high at the beginning and gradually decrease throughout the reading period though sometimes increasing towards the end. In general, it has been shown that optimum feeding schedules sacrifice efficiency at the beginning of the rearing period when little weight is being gained and maximize efficiency at the end of the rearing period when the greatest amount of weight is being gained. This is in contrast to schedules often devised by hatchery managers to achieve a specified size at a particular date. These schedules may sacrifice efficiency at the end of the rearing period to achieve the goal. (Reprinted by Permission of Publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1985
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Development of a state space boiler model for process optimization
Article Abstract:
A physically based boiler model is developed to solve a set of optimization problems. The model evaluates the normal operation of a 235MW gas/oil boiler. The model has 7 states in the process and 25 states in the control system. The boiler has a two-stage superheater, a single-stage reheater and an economizer. The designed steam pressure is 1815psia with both superheat and reheat temperatures of 1000 deg F. The model is used to solve the optimal set-point scheduling problem in the boiler system. This paper discussed the boiler process state space model. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1990
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