COPPE/UFRJ ยท Department of Mechanical Engineering
Leonardo Lobo; Luiz Alberto Santos Leite; Manoel Antonio Fonseca Costa; Gustavo Rabello dos Anjos
2017
Proceedings of the 24th ABCM International Congress of Mechanical Engineering
COBEM
Modelling, Pressure drop, biphasic and monophasic fluid flow, energy efficiency, thermodynamics, heat transfer, simple compression refrigeration system.
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 Frigorifico, located at Estrada Sao Joao Caxias, 1752, Sao Joao 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 oC and provide an internal temperature around 0 oC 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 Frigorifico 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.