Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
PERFORMANCE COMPARISON OF DIRECT EXPANSION SOLAR ASSISTED HEAT PUMP WORKING WITH R1234YF AS A DROP-IN REPLACEMENT FOR R134A
Submission Author:
Willian Moreira Duarte , MG , Brazil
Co-Authors:
Willian Moreira Duarte, Hélio Augusto Goulart Diniz, Tiago de Freitas Paulino, Sabrina Nogueira Rabelo, Luiz Machado
Presenter: Willian Moreira Duarte
doi://10.26678/ABCM.ENCIT2018.CIT18-0049
Abstract
There are several studies that compare the performance of R-134a and R-1234yf, but no yet for a direct expansion solar assisted heat pump (DX-SAHP). This theoretical analysis was made using lumped models for heat exchangers and a black box model for the hermetic R134a compressor. This modeling was validated using experimental results from DX-SAHP running with R134a in different environment conditions. The average difference between experimental and theoretical COP is 1.7%, lower than the uncertainty of COP experimental that is 4.9%. After that, this model is employed to the performance comparison of R-1234yf as a drop-in replacement for R-134a in a DX-SAHP. The results present that increased of the solar radiation, the ambient temperature or wind speed produce an increase in the COP for both refrigerants. Furthermore, the results show a slightly better performance for the R-134a compared to R-1234yf, the COP of R-134a from 2.1% to 4.2% higher.
Keywords
R1234yf, R134a, heat pump, Solar assited, Replacement
