Table 2.
Results for optimal trigeneration system (base case) and conventional system.
| System composition | Conventional system | Trigeneration system | ||
|---|---|---|---|---|
| Number | Total power | Number | Total power | |
| Gas engines | — | — | 3 | 1739 kW |
| Hot water boilers | 6 | 3420 kW | 3 | 1710 kW |
| Heat exchangers | — | — | 4 | 1600 kW |
| Absorption chillers | — | — | 1 | 490 kW |
| Mechanical chillers | 4 | 1960 kW | 3 | 1470 kW |
| Cooling towers | 3 | 3000 kW | 3 | 3000 kW |
|
| ||||
| Natural gas (total) MWh/yr | 8703 | 37,324 | ||
| Purchased electricity MWh/yr | 3572 | 29 | ||
| Sold electricity MWh/yr | — | 11,389 | ||
| Natural gas (cogeneration) MWh/yr | — | 36,638 | ||
| Cogenerated electricity MWh/yr | — | 14,954 | ||
| Cogenerated useful heat MWh/yr | — | 8,602 | ||
|
| ||||
| Primary energy savings % | — | 10.01 | ||
| Equivalent electrical efficiency % | — | 55.22 | ||
|
| ||||
| Annual fixed cost €/yr | 219,650 | 510,830 | ||
| Cost of natural gas €/yr | 217,582 | 933,092 | ||
| Cost of electricity €/yr | 366,951 | 3207 | ||
| Profit with the sale of electricity €/yr | — | −876,960 | ||
| Annual energy cost €/yr | 584,534 | 59,339 | ||
|
| ||||
| Annual total cost €/yr | 804,184 | 570,169 | ||