Abstract ▼ AI-Helper

Refrigerants have been continuously developed for improving performances or dealing with environmental problems. Recently, regulations on refrigerants is being intensified due to global warming. To meet enhanced environmental standard, the Low GWP (global warming potential) refrigerant have been dev...

Refrigerants have been continuously developed for improving performances or dealing with environmental problems. Recently, regulations on refrigerants is being intensified due to global warming. To meet enhanced environmental standard, the Low GWP (global warming potential) refrigerant have been developed. R-1233zd(E) is developed in this flow is a kind of Low GWP refrigerant. It has very low GWP and near zero ODP (ozone depletion potential). In this study, to investigate characteristics of condensation heat transfer and pressure drop for R-1233zd(E), experimental study are conducted. The experiments are carried out at total and partial condensation conditions in plate heat exchangers. From the test results, it is found that chevron angle on thermal plate have a strong influence both condensation heat transfer and pressure drop. In the case of comparison with other refrigerants such as R-134a, it is shown that average heat transfer coefficients for R-1233zd(E) lower than those for R-134a and R-1234ze(E). Meanwhile, heat transfer coefficients and frictional pressure drops by the change of mean vapor quality are yielded thorough the partial condensation experiments. The test results are used to develop experimental correlations about Nusselt number and friction factor. When compared experimental results with calculated results, The experimental Nusselt number of 96.9% and experimental friction factor of 94.5% are distributed within the error range of ±20%. Finally, the accuracy of the experimental correlations derived from this study is confirmed through comparison with other experimental correlations.

Keyword