Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Thermoeconomic Simulation of Cascaded and Integrated Vapor Compression-Absorption Refrigeration Systems
Submission Author:
Filipe Nogueira , MG
Co-Authors:
Filipe Nogueira, Paulo Eduardo Lopes Barbieri
Presenter: Filipe Nogueira
doi://10.26678/ABCM.ENCIT2020.CIT20-0224
Abstract
The present work is composed by a comparative thermoeconomic analysis between two refrigeration systems: Vapor Compression Cascade Refrigeration System (SRCCV) and Integrated Refrigeration System by Absorption and Vapor Compression (SIRACV). The thermoeconomic analysis compares the systems under energy, exergic, economic and environmental aspects. The development of mathematical models for each of the systems is performed through the EES (Engineering Equation Solver) program. The optimized functions are exergy destruction and total cost rate (sum of cost rates for investment, operation, maintenance and enviromental) by minimizing these functions. The optimization method used is the weighted sum of the objectives, this can be achieved by assigning different weights for each goal, then a new function that represents the linear relationship between all the objectives is found. In present case the two objective functions are exergy destruction and total cost rate. In multiobjective optimization, the process of choosing among optimized solutions involves the definition of an equilibrium point, also called the ideal point. In order to achieve a real solution of the minimum values of the described functions simultaneously one must determine which is the smallest distance from the ideal point to the curve that defines the optimized solutions. In the study the advantage of SRCCV in relation to SIRACV was demonstrated. SIRACV has a cost 6.40% lower than SRCCV while SRCCV has a better exergetic efficiency and energy, with its destruction of exergy 34.40% lower than SIRACV.
Keywords
Refrigeration, multiobjective optimization, thermoeconomic analysis
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