Abstract
In this study natural convection heat transfer of 15 fin-tube heat exchangers was measured. There were five fin pitches and three different tube numbers. The results show that lower chilled water temperature will give more heat transfer, but water velocity in tubes is a weak factor of heat transfer. It was also found that the single-tube heat exchangers have the highest heat transfer coefficient, with the three-tube heat exchangers the lowest. The heat transfer coefficient and the unit area heat transfer rate of the heat exchangers can reach 10 W/m 2°C and 100 W/m 2, respectively. A hydraulic diameter for fin-tube heat exchangers was defined and used as the length scale of natural convection heat transfer. The experimental results were analyzed and the correlation Nu = 0.43 (RA) 0.25 was obtained.
| Original language | English |
|---|---|
| Article number | 4727 |
| Pages (from-to) | 354-360 |
| Number of pages | 7 |
| Journal | ASHRAE Transactions |
| Volume | 110 PART II |
| State | Published - 2004 |
| Externally published | Yes |
| Event | Technical and Symposium Papers - 2004 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers - Nashville, TX, United States Duration: 26 06 2004 → 30 06 2004 |