EDN: ULUQMQ
Authors & Affiliations
Matyash A.S., Lychakov V.D.
Polzunov Scientific and Development Association for Research and Design of Power Equipment, St. Petersburg, Russia
Matyash A.S. – Lead Research Engineer. Contacts: 3/6, st. Atamanskaya, Saint Petersburg, 191167. Tel.: +7 (812) 578-88-09; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Lychakov V.D. – Deputy Head of the Center, Cand. Sci. (Tech.).
Abstract
Collapsible plate heat exchangers are widely used in many auxiliary systems of nuclear power plants of standard designs AES-2006 and VVER-TOI. In the period from 2015 to 2022, JSC NPO CKTI tested 21 types of heat transfer plates of various designs and sizes. Based on a large array of experimental data, it was found that in the presence of a pressure difference between the channels of the heat exchanger above a certain limit value, a “breathing effect” often occurs, i.e. there is an elastic deformation of the heat transfer plates in the direction from the circuit with a high pressure to the circuit with a lower pressure. This effect leads to a change in the actual areas of the flow section of the channels. The flow area of the circuit with lower pressure is reduced, which leads to a significant increase in hydraulic resistance. The flow area of the circuit with high pressure increases, which leads to a decrease in the heat transfer coefficient.
An analysis of the array of experimental data obtained showed that with a flow of a medium of similar properties and close flow rates in both circuits, the influence of this effect on the overall heat transfer efficiency is minimal. However, when the heat exchanger operates on media having different physical properties, the difference between the calculated heat transfer coefficient and the real one can reach 25 % or more.
Keywords
plate heat exchanger, elastic deformation, forced convection, hydraulic resistance, flow in channels of complex shape
Article Text (PDF, in Russian)
References
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UDC 536.243
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 1, 1:20
