Abstract
Heat transfer characteristics of a potential refrigerant R 32/R 1234ze(E) in horizontal microfin tubes are experimentally investigated in this study. The heat transfer coefficient (HTC) and pressure drop are measured at saturation temperatures 40 and 10 °C for condensation and evaporation, respectively. The HTC of R 1234ze(E) is lower than that of R 32, as predicted by several correlations. Degradation in the HTC of the R 32/R 1234ze(E) mixture is significant; the HTC is even lower than that of R 1234ze(E). During condensation and evaporation process, the HTC is minimized at compositions 0.5/0.5 and 0.2/0.8 by mass fraction, respectively. The magnitude of heat transfer degradation by the volatility differences is much severer for evaporation than condensation.
| Translated title of the contribution | Condensation and Evaporation of Low GWP Refrigerant Mixture R 32/R 1234ze(E) in Horizontal Microfin Tubes |
|---|---|
| Original language | Japanese |
| Pages (from-to) | 401-411 |
| Number of pages | 11 |
| Journal | 日本冷凍空調学会論文集 |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2013 |