Abstract
The article deals with the development of incompressible ideal gas like model, which can be used as a part of mathematical model describing natural draft wet-cooling tower flow, heat and mass transfer. It is shown, based on the results of a complex mathematical model of natural draft wet-cooling tower flow, that behaviour of pressure, temperature and density is very similar to the case of hydrostatics of moist air, where heat and mass transfer in the fill zone must be taken into account. The behaviour inside the cooling tower is documented using density, pressure and temperature distributions. The proposed equation for the density is based on the same idea like the incompressible ideal gas model, which is only dependent on temperature, specific humidity and in this case on elevation. It is shown that normalized density difference of the density based on proposed model and density based on the nonsimplified model is in the order of 10-4. The classical incompressible ideal gas model, Boussinesq model and generalised Boussinesq model are also tested. These models show deviation in percentages.
Highlights
The working principle of natural draft wet-cooling tower is connected with releasing of latent heat during water evaporation
There are comparisons of the distribution of density, temperature and pressure calculated using general model of flow, heat and mass transfer, where non-simplified equation of state is used, with distributions based on hydrostatics of moist air in figures 1, 2 and 3
It is visible that the behaviour above the fill zone practically corresponds with the behaviour connected with hydrostatics of moist air, where the parameters above the fill are taken into account
Summary
The working principle of natural draft wet-cooling tower is connected with releasing of latent heat during water evaporation. This effect is connected with a decrease of moist air density. There is a density difference between surrounding and inside of cooling tower which can create a natural draft. The density change in the natural draft cooling tower is not related only to heat and mass transfer between water and moist air, but there is the change due to gravity. The aim of this article is to identify the influences affecting the density change inside the natural draft wetcooling tower. The article deals with the testing and modifying of known simplified density models using data from the non-simplified model of flow, heat and mass transfer
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