The objective of this study is to investigate the heat transfer characteristics of spirally-coiled circular fin-tube heat exchangers under frosting conditions. The heat transfer rate, pressure drop, frost thickness, and Nusselt number of the heat exchanger were measured and analyzed by varying the fin pitch and number of tube rows under frosting conditions. In addition, the Nusselt number of the spirally-coiled circular fin-tube exchanger was compared with those of flat plate fin-tube heat exchangers with discrete fins. An empirical correlation of the Nusselt number was developed as a function of the Reynolds number, dimensionless fin pitch normalized by the hydraulic diameter, i.e., Dh/Fp, Fourier number, and number of tube rows. The measured Nusselt number was consistent with the predicted value with mean and average deviations of 3.5% and 0.3%, respectively.
Bibliographical noteFunding Information:
This research was sponsored by the Korea Institute of Energy and Resources Technology Evaluation and Planning (Grant No. 2008NBLHME0900002008 ).
Copyright 2010 Elsevier B.V., All rights reserved.
- Heat exchanger
- Heat transfer
- Pressure drop
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering