A temporary variation of a demand is usually modeled by multiplying the base demand of nodes with a curve representing the time pattern of this nodal demand. In this exercise, we use three different patterns: one for residential demands, one for an industry working during the night and one for a commercial demand. The table below shows the values of each demand pattern.
Starting Time | Demand Pattern Res | Demand Pattern Ind | Demand Pattern Com |
00:00 | 0.9 | 1 | 0.1 |
01:00 | 0.85 | 1.1 | 0.1 |
02:00 | 0.8 | 1.15 | 0.15 |
03:00 | 0.7 | 1.2 | 0.2 |
04:00 | 0.75 | 1.25 | 0.1 |
05:00 | 0.85 | 1.25 | 0.1 |
06:00 | 0.9 | 1.1 | 0.5 |
07:00 | 1 | 1 | 0.9 |
08:00 | 1.05 | 0.8 | 1.2 |
09:00 | 1.1 | 0.5 | 1.25 |
10:00 | 1.2 | 0.2 | 1 |
11:00 | 1.3 | 0.1 | 1.1 |
12:00 | 1.25 | 0.1 | 1.2 |
13:00 | 1.05 | 0.2 | 1.3 |
14:00 | 1 | 0.1 | 1.1 |
15:00 | 1 | 0.2 | 1 |
16:00 | 1.2 | 0.1 | 0.9 |
17:00 | 1.25 | 0.7 | 0.8 |
18:00 | 1.35 | 0.85 | 0.5 |
19:00 | 1.2 | 0.9 | 0.2 |
20:00 | 1.1 | 0.95 | 0.1 |
21:00 | 1 | 0.98 | 0.15 |
22:00 | 0.95 | 1 | 0.1 |
23:00 | 0.9 | 1.1 | 0.05 |
A demand pattern can be created directly from the Data browser window as indicated in the figure below. By clicking the “Add” button the “Pattern Editor” box opens up. The name of the pattern curve (Pattern ID) and the dimensionless coefficients (Multipliers) for each time step are then to be set (see figure below).
For each pattern with a different ID, a new Time-Multiplier table needs to be created. Follow the data presented in the Table 1.5.1: Pipe Demand pattern of this section, to create all necessary patterns. As an alternative, an external file in .DOT format can be used to upload patterns, using the Load button (see figure above).