Units: | % |
Mode: | Input/Output |
Multi-band: | True |
Default Value: | 100 |
Validation Rule: | Any Value |
Key Property: | No |
Description: | Primary Process marginal efficiency at the given [Efficiency Point] |
Facility Efficiency Incr is used in multi-band pairs with Efficiency Point to define a custom efficiency function for the Primary Process conducted by the Facility overriding the Process Efficiency. The value in band n is the average efficiency between the Efficiency Point n - 1 and n.
Facility | Property | Value | Units | Band |
---|---|---|---|---|
NH3.Plant | Max Efficiency Tranches | 2 | - | 1 |
NH3.Plant | Efficiency Point | 40 | % | 1 |
NH3.Plant | Efficiency Point | 100 | % | 2 |
NH3.Plant | Efficiency Incr | 3506.25 | % | 1 |
NH3.Plant | Efficiency Incr | 6010.71 | % | 2 |
For the example in Table 1, the raw data are shown in Table 2. Here
the input and output energy of the process are used to calculate the
efficiency at each production level and then the incremental
efficiency using the formula:
Efficiency Incrn = 100 × ( Output Energyn - Output Energy(n-1) ) / (Input Energyn - Input Energy(n-1) )
Input (MWh) | Output (kg) | Input (MJ) | Output (MJ) | Efficiency | Efficiency Incr |
---|---|---|---|---|---|
3.5 |
19,635 |
12,600 |
441,787.5 |
3,506.25% |
3,506.25% |
8.75 |
70,125 |
31,500 |
1,577,812.5 |
5,008.93% |
6,010.71% |
The number of bands (tranches) used in the simulation is set by the Max Efficiency Tranches setting. If you want your efficiency function used 'verbatim' then set this value equal to the number of bands of input supplied, otherwise if you set the value higher or lower than the number of bands supplied the efficiency function will be recalculated to match that number of bands.
The incremental efficiencies do not need to be monotonic e.g.
always increasing or decreasing. By default the function is formulated
with integer decision variables and constraints that ensure the
efficiency bands are taken up in order. You can control this with the
Formulate Non-convex
setting.