Читать книгу Agitator Design for Gas-Liquid Fermenters and Bioreactors - Gregory T. Benz - Страница 24

There may be several mechanically feasible designs at different shaft speeds. These different designs may have different costs. Higher speed means less torque and a less expensive gear box. However, the shaft design may be more expensive. There is no straightforward rule of thumb for this; each design must be fleshed out and a cost estimate made. In general, we would choose the least capital cost design unless there are other constraints. Once a semi‐final design is selected (for the entire optimization process we go through here, not just shaft speed), equipment vendors are generally helpful in optimizing capital cost.