Robustness of Electricity and Chilled Water Supply Systems Subject to Change Technical and Economic

This paper presents a methodology to evaluate the economic robustness of thermal systems designed to supply air conditioning and electricity for shopping malls in an Brazilian northeastern state. The procedure uses a hybrid method to minimize the Net Present Value (NPV) of the life costs. The optimization considers technical and economic aspects such as curves of demand, tariff variation along the day, equipment efficiencies and costs. It was studied the robustness of the systems in relation to variations of fuel tariff, electricity tariff, engine price, dollar fluctuation and demand profile.