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Heat transfer in film-type cooling towers with a profiled surface of sprinklers under conditions of the longitudinal and cross direction of air flow

Dubrovskyi V.V., PhD (Engin.), Senior Research Scientist, Pidvysotskyi O.M., PhD (Engin.), Senior Research Scientist
Institute of General Energy of the National Academy of Sciences of Ukraine, 172 Antonovycha St., Kyiv, 03680, Ukraine
Language: Ukrainian
Source: The Problems of General Energy, 2014, 1(36):55-60
Section: Study and optimization of the technological objects and systems of the energy sector
UDC: 536.24
Received: 05.03.2014
Published: 19.03.2014

Abstract:

The search for possibilities to intensify the process of cooling of circulation water is of great practical interest because the degree of water cooling affects substantially the technoeconomic characteristics of the units of thermal and nuclear power plants as well as different industrial objects.
As is known, the process of water cooling in cooling towers depends substantially on the intensity of air flow that blows over it. In film-type cooling towers, depending on the position of sprinklers with respect to air flow, the blow of surfaces with a liquid film can have different directions.
The aim of the present work is to investigate heat transfer between water and air under conditions of the longitudinal and transverse (cross) interaction of the phases. Using our experimental facility, we have carried out the corresponding complex of investigations. We have found the values of heat transfer coefficient from water to air for different directions of air action and performed their comparison. We have established that the efficiency of water cooling under condition of the transverse air action is higher than in the case of counterflow.
We have obtained dimensionless generalizing dependences for determining the intensity of heat transfer from water to air at water flow along profiled surfaces of sprinklers under conditions of longitudinal and cross interaction of the contacting phases. There relations can be used for calculation of the water temperature after cooling towers.

Keywords: heat transfer, profiled surface of sprinklers, relative velocity of water and air, longitudinal and cross interaction phases.

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