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. Author manuscript; available in PMC: 2019 Aug 4.
Published in final edited form as: Comput Chem Eng. 2018 Feb 21;116:488–502. doi: 10.1016/j.compchemeng.2018.02.017

Table 9.

Dimensionality of the multi-objective energy systems design problem. The table also summarizes the types of surrogate used in the study for each grey-box constraint that was present in the problem formulation.

Type of on-site energy generation technology considered Number of Input Variables Number of Grey-Box Constraints Types of Surrogates Used
Natural gas-powered CHP (NG CHP) 17 19 Objective: linear
Constraints 1, 6, 7, 10-19: linear
Constraints 2-5, 8, 9: quadratic
Wind Turbine & Solar Photovoltaics (WT + SPV) 16 12 Objective: quadratic
Constraints: quadratic