A New Algorithm for a Condenser Design for Large-Scale Nuclear Power Plants in Tropical Region
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https://doi.org/10.1007/s11630-020-1270-x
Article ID: 1003-2169(2020)00-0000-00
A New Algorithm for a Condenser Design for Large-Scale Nuclear Power Plants in Tropical Region KHAN Abid Hossain1,2, ISLAM Md. Shafiqul2* 1. Department of Industrial and Production Engineering, Jashore University of Science and Technology, Jashore 7408, Bangladesh 2. Department of Nuclear Engineering, University of Dhaka, Dhaka 1000, Bangladesh © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: This work presents a new velocity search algorithm for designing a condenser of a 1200 MWe large-scale nuclear power plant situated in tropical region. For this, the condenser pressure was considered in the range of 7.5–15 kPa while its tube inner diameter was taken as 28 mm with 1 mm tube wall thickness. Both longitudinal and transverse condensers with multiple shell tanks and varied shell tank lengths from 8–14 m have been considered in this work. Three different tertiary coolant temperature rises were chosen as 4, 8 and 12°C by considering tropical region average reservoir water temperature range of 28–32°C during summer. Velocity of tertiary coolant was kept within 0.75–1.5 m/s to ensure sufficient turbulence to avoid erosion-corrosion of the tubes. Numerical simulation has been employed to obtain tube-side pressure drop and convection heat transfer coefficient directly from tertiary coolant inlet velocity using κ-ω turbulent flow model. A new iterative “velocity-search algorithm” has been developed that focuses on finding the correct tertiary coolant velocity instead of overall heat transfer coefficient. Results revealed that velocity-search algorithm yielded very close to the important physical and thermal parameters of condenser compared to the existing design data in large scale nuclear power plants. Velocity-search algorithm has given less number of condenser design physical parameters that meets the velocity acceptance criteria for longitudinal condenser compared to the transverse condenser. Finally, velocity-search algorithm is found to be more reliable, robust, and consistent for condenser design compared to the conventional design algorithm used in Log-Mean Temperature Difference method.
Keywords: nuclear power plant, vacuum condenser, velocity-search algorithm, tropical region
1. Introduction The condenser is one of the most important parts of the secondary loop as it is responsible for rejecting the unused heat in the steam turbine of the power plant into the environment. Failure to remove this heat may result in catastrophic events like Fukushima nuclear accident [1]. Therefore, condenser of a power plant must be Received: May 24, 2019
AE: SUN Jie
designed keeping in mind for all the possible operating limits and conditions. The size and number of condenser shell tanks vary largely with the size of the power plant. Some plants may require a single condenser tank while the other may require more than one condenser tank, as observed in the review
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