Research Article

Determination of heat demand and optimal production capacity for yeast production by use of MS Solver

ABSTRACT

The main cost of production is directly related to the heat demand, the quantity of used raw material and the prices of raw materials and utilities. This value could be optimized. So, the main task of this work would be the minimization of heat energy demand and maximization of production capacity. For these purposes, it was created a simulation model as mathematical function of all inputs and outputs of the analyzed system. That model is based on mass and heat balances for all streams which connect processing units in different modes of work as batch, continuous, semi-continuous and feed-batch. This mathematical model was made in MS Excel. All variables like temperatures and flows are inserted in that worksheet and calculated from set of equations for mass and heat balances. Change of values for input variables (quantity of raw materials), cause changes of all processing parameters and parameters that characterize final products. The optimization is done with MS Solver. That tool use only one parameter as objective for optimization. Because of that, three different objectives were chosen for three different optimization goals for the production processes. Optimization was done as minimization of total heat demand, maximization of final product's capacity and minimization of the common parameter that relate to heating demand and production capacity. The use of the common parameters for heat demand and production capacity gives the best result, because it minimized heat energy and maximizes production capacity. This optimization also created optimal process scheduling as its result.

Keywords

optimization heat demand heat recovery Baker`s yeast