Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Evaluation of the Heat Exchange Characteristics of Cooling Tubes with External Fins for Ventilation Units of the NPP-2006 Design Containment

9/20/2024 2024 - #03 Nuclear power plants

Soloviev S.L. Shishov A.V. Povarov V.P. Yaurov S.V.

DOI: https://doi.org/10.26583/npe.2024.3.01

UDC: 621.039

The paper analyses the factors that affect the cooling capacity of the ventilation units used for cooling air inside the containment of the Novovoronezh NPP II. The heat exchange devices for air cooling represent bundles of rectilinear tubes of the same type, having fins on their outside, arranged in several rows across the ventilation duct perpendicular to the air flow. Each heat exchanger unit consists of two heat exchangers (stages), in which the cooling medium (water) is pumped by different independent process systems. As part of the package of activities to search for the areas for upgrading the containment ventilation system at the Novoronezh NPP II, the authors undertook a series of calculations aimed at determining the causes for the low efficiency of the heat exchange units of the NPP’s ventilation system. The study aimed to estimate the effect of the contact between the fins and the heat exchanger tubes, estimate the effect of the cooling water temperature at the heat exchanger inlet, and estimate the effect of the cooling water flow on the cooling capacity. Based on the results of the study, the following conclusions have been made: the existing design of the heat exchange surface of the ventilation unit cooling stages (tube and band) is equivalent to a bare tube with an improved heat exchange performance due to turbulence and mixing of the air flow using a metallic band, as well as to partial (discontinuous) thermal contact of the latter to the outer surface of the heat exchange tube. At the same time, a variation in the cooling water flow does not have a major effect on the change in the cooling capacity of the heat exchanger.

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NPP-2006 ventilation upgrading containment operating experience numerical simulation heat exchange tubes finning cooling medium

Link for citing the article: Soloviev S.L., Shishov A.V., Povarov V.P., Yaurov S.V. Evaluation of the Heat Exchange Characteristics of Cooling Tubes with External Fins for Ventilation Units of the NPP-2006 Design Containment. Izvestiya vuzov. Yadernaya Energetika. 2024, no. 3, pp. 6-17; DOI: https://doi.org/10.26583/npe.2024.3.01 (in Russian).

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