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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
DIRECT EXPANSION HEAT PUMP EVAPORATOR MATHEMATICAL MODELING FOR THE SELECTION OF A REFRIGERANT WITH OPTIMIZED ENVIRONMENTAL PERFORMANCE
Submission Author:
Hélio Augusto Goulart Diniz , MG , Brazil
Co-Authors:
Hélio Augusto Goulart Diniz, André Gonçalves de Oliveira, STELLA MARYS SILVA PINHEIRO, Raphael Nunes Nunes de Oliveira, Luiz Machado
Presenter: Hélio Augusto Goulart Diniz
doi://10.26678/ABCM.ENCIT2020.CIT20-0259
Abstract
The mathematical modeling of heat exchangers is explored by the scientific community in studies of thermal equipment to evaluate the feasibility of replacing traditional refrigeration fluids with ecological fluids and their impact on the system energy efficiency. The present work aims to present the evaporator mathematical modeling of a Direct-Expansion Solar Assisted Heat Pump (DX-SAHP) used to residential water heating combined with the selection procedure for a friendly refrigerant. The methodology is based on dimensioning the heat exchanger and evaluating, through computer simulations, the global energy efficiency of the system and the Total Equivalent Warming Impact (TEWI) using the following refrigerants that have low GWP (Global Warming Potential) and ODP (Ozone Depleting Potential) zero: R152a, R744, R1234yf, R1234ze (E), R1233zd (E), R170, R290, R600 and R600a. The goal of this work is to develop a useful tool for selecting an appropriate ecological refrigerant to be used in a solar heat pump depending on the required operating conditions. The main result is the selection of R290 to operate the proposed system. This study has allowed the development of a useful tool for the selection of the appropriate ecological refrigerant of a low cost residential solar heat pump.
Keywords
mathematical modeling, DX-SAHP, evaporator, TEWI, ecological fluids
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