By N. Boccara
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Extra resources for Analyse Fonctionnelle. Une introduction pour physiciens
This is similar to your car, which might be able to drive at 1 30 miles per hour (capacity), but typically-or better, hopefully-only drives at 65 miles per hour (flow rate) . N o t only can capacity b e measured a t the level of the overall process, it also can be measured at the level of the individual resources that constitute the process. Similar to how we defined process capacity, we define the capacity of a resource as the maximum amount the resource can produce in a given time unit. As the completion of a flow unit requires the flow unit to visit every one of the resources in the process, the overall process capacity is determined by the resource with the smallest capacity.
9 Utilization First, given that no resource can achieve a higher utilization than the bottleneck, every process step other than the bottleneck will have a utilization gap relative to the bottleneck. Utilization Profile 1 00% Mismatch between Demand and Supply at the Process Level 90% 80% ------ r -------------------------- imbalance Relative to BOllleneck 70% 60% 50% 40% 30% 20% 1 0% 0% Preheater Hoppers Flasher LetPressu-Downre MaBriqcuethinteing TotProcaessl Lock CFB RStatieactoonaryr Heat System (Bottleneck) Understanding the Supply Process: Evaluating Process Capacity 43 TABLE 3 .
In contrast, we cannot infer from utilization by how much demand exceeds the capacity of the process. This is why we need to introduce an additional measure. We define the implied utilization of a resource as 1mp 1·Ied uti' 1"lZatlon Capacity requested by demand = Available capacity The implied utilization captures the mismatch between the capacity requested from a resource by demand (also called the workload) and the capacity currently available at the resource. Assume that demand for the Circored ore would increase to 1 ,095,000 tons per year ( 1 25 tons per hour).
Analyse Fonctionnelle. Une introduction pour physiciens by N. Boccara