Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
COMPUTATIONAL MODELING AND ENERGY EVALUATION OF A REAL COOLING SYSTEM OF A REFRIGERATION CHAMBER.
Submission Author:
Leonardo Lobo , RJ
Co-Authors:
Leonardo Lobo, LUIZ ALBERTO SANTOS LEITE, Manoel Antônio da Fonseca Costa Filho, Gustavo Rabello dos Anjos
Presenter: Leonardo Lobo
doi://10.26678/ABCM.COBEM2017.COB17-0852
Abstract
This study was developed to theoretically size, through computational tools, the efficiency of a real refrigeration system of simple compression, working with refrigerant fluid R404a. The object of the study is composed of a refrigeration chamber of the Novo Meriti Frigorífico, located at Estrada São João Caxias, 1752, São João de Meriti, RJ. Two identical refrigeration systems consisting of one condensing unit and two evaporator units, the pipeline extensions of each one is their own, are responsible, in parallel, by the cooling of the chamber. The system was designed and selected to operate at a maximum ambient temperature of 40° C and provide an internal temperature around 0° C on cold room for 24 hours a day, 7 days a week. To the modeling, the data were collected by measuring equipment at monthly maintenance routines. With this, the computational modeling was designed to offer, through equations of state, thermodynamic properties and pressure drops, a working image for the main components of the system for 7 months. Consequently, it was possible to perform an energy analysis under the operating conditions in the months covered. This work was possible through the collaboration between 3 companies and the authors, they are Frigorífico Novo Meriti Ltda., RGT Engenharia de Sistemas Ltda. and Heatcraft Brasil Ltda. These companies participate by releasing information and data of the operation, maintenance and design, respectively, plus support and authorization to stay in the installations of the refrigerator units.ta were provided by measuring equipment, such as pressure upstream and downstream of the compressor plus overheating and subcooling temperatures. With these, the modeling was designed in such a way to offer, through state equations, tables of thermodynamic properties and area software, a working image for the whole system for 7 consecutive months. As consequence, it was possible to carry out an exergetic analysis during various climatic scenarios and various operating conditions and so to draw conclusions about the operation of the refrigerator and possible improvements in the structure of the same.
Keywords
modelling, pressure drop, biphasic and monophasic fluid flow, energy efficiency, Thermodynamics, Heat transfer, simple compression refrigeration system
