Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EVALUATION OF A COMPACT SYSTEM OF TRIGENERATION THROUGH ENERGY AND EXERGY ANALYSIS
Submission Author:
Nestor Proenza Perez , SP
Co-Authors:
Nestor Proenza Perez, Celso Eduardo Tuna, Julio Antunes, José Luz Silveira
Presenter: Nestor Proenza Perez
doi://10.26678/ABCM.ENCIT2018.CIT18-0019
Abstract
First and second laws of thermodynamics are employed to analyze the quantity and quality of energy in a small compact trigeneration system. This combined cycle is composed of a little reciprocating internal combustion engine model GM, 1.0 CORSA, using liquefied petroleum gas as fuel, two heat exchangers and an absorption chiller utilizing water–ammonia as working fluid mixture. The mass and energy balance equations of the engine and subsystems are reviewed in detail. Exergy of each involved stream is calculated and the exergetic balance of each subsystem is presented, as well as the global system, identifying where and why losses and irreversibilities occurs. Efficiencies based on the second law of thermodynamics are calculated for each subsystem and compared. Special attention is given to identification and quantification of second law efficiencies and the irreversibilities of all subsystems. The determination of the irreversibilities in each subsystem is particularly important since they are not identified in traditional first law analysis. Furthermore, this study revealed that the combustion was the most important contributor to the system inefficiency representing 36.0% of the total exergy input and 73% of the total exergy destruction. The exergetic efficiency of the trieneration system is determined to be 51.19%.
Keywords
Trigeneration, energetic analyses, exergetic analyses, Internal combustion engine, efficiencies
