Synthesis of Trigeneration Systems: Sensitivity Analyses and Resilience

Table 4

Sensitivity analysis for variations in energy demands considering the base case configuration.

Variation	−20%	−15%	−10%	−5%	0%	+5%
System composition
Gas engines	3	3	3	3	3	3
Hot water boilers	3	3	3	3	3	3
Heat exchangers	4	4	4	4	4	4
Absorption chillers	1	1	1	1	1	1
Mechanical chillers	3	3	3	3	3	3
Cooling towers	3	3	3	3	3	3
Natural gas (total) MWh/yr	31,921	33,520	34,976	36,407	37,324	37,389
Purchased electricity MWh/yr	0	0	9	16	29	45
Sold electricity MWh/yr	10,090	10,521	10,892	11,244	11,389	11,188
Natural gas (cogeneration) MWh/yr	31,757	33,256	34,589	35,880	36,638	36,520
Cogenerated electricity MWh/yr	12,962	13,574	14,118	14,645	14,954	14,906
Cogenerated useful heat MWh/yr	7371	7719	8028	8328	8602	8857
Primary energy savings %	9.77	9.77	9.77	9.77	10.01	10.70
Equivalent electrical efficiency %	55.00	55.00	55.00	55.00	55.22	55.87
Annual fixed cost €/yr	510,830	510,830	510,830	510,830	510,830	510,830
Cost of natural gas €/yr	798,035	838,003	874,395	910,169	933,092	934,714
Cost of electricity €/yr	0	0	1076	1720	3207	5083
Profit with the sale of electricity €/yr	−776,967	−810,149	−838,713	−865,824	−876,960	−861,441
Annual total cost €/yr	531,899	538,684	547,588	556,895	570,169	589,186