Andrea Lazzaretto

TL;DR: In this article, a systematic and general methodology for defining and calculating exergetic efficiencies and exergy related costs in thermal systems is proposed, based on the Specific Exergy Costing (SPECO) approach, in which fuel and product of a component are defined by taking a systematic record of all exergy additions to and removals from all the exergy streams of the system, and the costs are calculated by applying basic principles from business administration.

TL;DR: In this paper, a thermal system design can be optimized using energy, economy and environment as separate objectives, and an evolutionary algorithm is used to find the surface of optimal solutions in the space defined by the three objective functions.

TL;DR: In this article, a multi-objective optimization is proposed to find solutions that simultaneously satisfy exergetic and economic objectives in thermal system design, which corresponds to a search for the set of Pareto optimal solutions with respect to the two competing objectives.

TL;DR: The selection of the cycle configuration, working fluid and operating parameters is crucial for the economic profitability of organic Rankine Cycle systems using low to medium temperature heat sour energy as discussed by the authors, and the selection of cycle configuration and working fluid is critical for economic profitability.

TL;DR: In this paper, an off-design model of an organic rankine cycle is presented to find the optimal operating parameters that maximize the electricity production in response to changes of the ambient temperatures between 0 and 30°C and geofluid temperatures between 130 and 180°C.