Abstract
The tube inside and outside heat transfer mechanism of Passive Residual Heat Removal Heat Exchanger (PRHR HX) was analyzed. The calculation method of this special heat exchanger under natural convection condition in In-containment Refueling Water Storage Tank (IRWST) was carried out. The single-tube coupling model three-dimensional natural circulation in the IRWST was simulated numerically using Fluent. The heat transfer and flow characteristics of the fluid in IRWST were obtained. The comparison of the results between theoretical arithmetic and numerical simulation showed that the theoretical calculation method is suitable for the heat transfer calculation of PRHR HX.
Highlights
The passive residual heat removal heat exchanger (PRHR HX) removes core decay heat to mitigate loss of heat sink events depressurizes the system [1]
This paper describes the heat transfer calculation method of PRHR HX
The follow assumptions are considered in the calculation: 1) Fluid temperature is uniform in the radial direction, only changes in the axial direction of in-containment refueling water storage tank (IRWST); 2) Heat transfer performance of different tube is the same
Summary
The passive residual heat removal heat exchanger (PRHR HX) removes core decay heat to mitigate loss of heat sink events depressurizes the system [1]. It transfers heat from the primary side to the containment by heating the water in the in-containment refueling water storage tank (IRWST). Because of the change of the inner tube fluid temperature and tank fluid temperature during the operation of PRHR HX, unlike the ordinary heat exchangers, the heat transfer in PRHR HX is an unsteady process.
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