Kong's triangular (60°) NDDCS against its own CFD
Tier 3: CFD, co-simulation or another model.
- What was compared
- The air mass flow rate and the heat transfer rate of a windless direct natural-draft dry cooling tower with its condenser in a ring of 60° cooling deltas (the triangular arrangement), on Kong's geometry and radiator relations.
- Against
- The CFD study of Kong et al. (2018, IJHMT 118, Tables 1 and 3, Eqs. 4 to 7), whose windless per-sector results are printed in Table 3; another model and not a measurement.
- The agreement
- The air mass flow rate is 2.82% above the CFD (33 509 kg/s against 32 590 kg/s) and the heat transfer rate 5.97% above it (1 205 MW against 1 137 MW). Of the 24.4% gain in heat transfer rate the CFD gives the annular (180°) arrangement over this one, the model reproduces 15.1%.
- What it shows
- The comparison shows that a one-dimensional draft balance agrees with a three-dimensional CFD of the same tower to within 3% on the air mass flow rate and 6% on the heat transfer rate, and captures a little under two thirds of the benefit of the annular arrangement. Both are models, so the case is not evidence about a real tower and carries no model-form uncertainty.
- Source
- Y. Kong, W. Wang, X. Huang, L. Yang, X. Du, 'Annularly arranged air-cooled condenser to improve cooling efficiency of natural draft direct dry cooling system', International Journal of Heat and Mass Transfer 118 (2018) 587-601Table 1 (geometry), Table 3 at 0 m/s (results), Eqs. (4)-(7) (the radiator model)