Liu's one-tower 2 x 660 MW plant under crosswind: the largest ring, a held load, and a sixth air-flow multiplier
Tier 3: CFD, co-simulation or another model.
- What was compared
- The air mass flow rate and the rise in water outlet temperature of a 2 × 660 MW plant's single 225 m natural-draft dry cooling tower under crosswinds of 4 to 16 m/s, with both units in service and with one, computed by Kröger's crosswind method with the heat transfer rate held at the CFD's own.
- Against
- A CFD study of the commissioned plant (Liu et al., 2021, Table 1 and Figs. 18 to 20), digitised, which is another model and not a measurement. The case is Tier 3.
- The agreement
- Windless, the air mass flow rate is 4.7% below the CFD with two units and 6.1% above it with one. Under wind the method as printed gives a two-unit air flow ratio of 0.770 against 0.761 at 8 m/s and 0.669 against 0.732 at 12 m/s, and a multiplier of 0.90 on the wind pressure coefficients reproduces the two-unit air flow from 4 to 12 m/s to 4.0 points RMS.
- What it shows
- The comparison tests Kröger's crosswind method, fitted on horizontal bundles, on the tallest tower among the references, and the multiplier that reproduces its air flow, 0.90, lies outside the 0.46 to 0.55 of the other five series. Above 12 m/s the CFD's air flow recovers and the method's does not, and the case is not a validation against a measured plant.
- Source
- W. Liu, Y. Kong, X. Du, L. Yang, 'Investigation of thermo-flow characteristics of natural draft dry cooling systems designed with only one tower in 2 x 660 MW power plants', Energies 14 (2021) 1308Section 2.1 and Table 1 (the plant and tower), 2.3 (boundaries: 12 degC, the 0.2 profile at 10 m), Figs. 18, 19 and 20