Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
COMPARATIVE ANALYSIS OF REFRIGERATION SYSTEMS USING IN SUPERMARKET
Submission Author:
Henrique Neiva Guimarães , MG
Co-Authors:
Flávio Pacelli Ziviani de Oliveira
Presenter: Henrique Neiva Guimarães
doi://10.26678/ABCM.ENCIT2016.CIT2016-0134
Abstract
In this paper it was analysed four types of refrigeration systems commonly used in supermarkets in Brazil: direct expansion, direct expansion cascade system, combined secondary glycol / CO2 cascade system and combined CO2 secondary / cascade system. The cycles were studied using a computer models able to simulate their performance using various types of refrigerants and temperature of condensation and evaporation. For the evaluation of the models, the influence of four refrigerants was studied: R404A, R134a, R1234yf and R22, both a ssociated with CO2 in three systems. The systems evaluated were simulated for different condensation temperatures, representing the ambient temperature of a city of each Brazilian region throughout the year: Belo Horizonte, Fortaleza, Goiânia, Belém and Porto Alegre. The results obtained in form of COP were compared in order to evaluate the best system for each region. Acording the obtained data, the best systems for brazilan climate are direct expansion system where there is one cold reservoir and combined CO2 secondary / cascade system where there are two different cold reservoir. The best fluids were R134a and R22, but the difference between the COP obtained by those fluids and those obtained by R1234yf is to low, so is indicated the use of R1234yf because their properties are better in sustainability questions.
Keywords
Refrigeration, CASCADE REFRIGERATION, Carbon dioxide, Refrigeration compressor, Refrigeration, CASCADE REFRIGERATION, Carbon dioxide, Refrigeration compressor, Refrigeration, CASCADE REFRIGERATION, Carbon dioxide, Refrigeration compressor, Refrigeration, CASCADE REFRIGERATION, Carbon dioxide, Refrigeration compressor
