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Analisi sperimentale della sostituzione del R134a con R1234yf, R1234ze(E), R450A e R513A in una pompa di calore acqua-acqua di piccola taglia
Experimental analysis of the substitution of R134a with R1234yf, R1234ze(E), R450A and R513A in a small capacity water-to-water heat pump
L. P. M. Colombo1, A. Lucchini1, L. Molinaroli luca.molinaroli@polimi.it1
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Abstract
In the present work, the experimental results of the substitution of R134a with R1234yf, R1234ze (E), R450A and R513A in a small water-to-water heat pump are discussed. An experimental setup that allows analysing the performance of different refrigerants in a broad range of operating conditions is used to carry out the comparison. The obtained results show that the use of any alter- native refrigerant leads to the reduction of the heating capacity and of the COP. The former lies within 77% - 98% and the latter lies within 94%-100% compared with R134a values. Furthermore, the increase of the rotational frequency of the compressor shaft allows bringing the heat pump heating capacity back to the R134a values but causes a further reduction of the COP that lies within 82% -98% compared with the baseline value.
Keywords
Heat Pump, Low GWP refrigerants, R134a alternatives
DOI
10.36164/AiCARRJ.59.06.02
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