A thermal hydraulic calculation method of an intermediate heat exchanger of a loop type FBR

作者：Mochizuki Hiroyasu; Hirai Kiyoyuki; Okamoto Akira; Takano Masahito

来源：Journal of Nuclear Science and Technology, 2015, 52(11): 1436-1447.

DOI：10.1080/00223131.2015.1006704

• IHX
• CFD
• heat transfer
• Monju
• 50 MW SG
• lower plenum

This paper describes a thermal-hydraulic calculation of an intermediate heat exchanger (IHX) with the computational fluid dynamics (CFD) code CFX. The motivation of this paper is to clarify a heat transfer degradation phenomenon in the IHX through three-dimensional calculation. The whole IHX of the Monju reactor is modeled with three parts, i.e., the primary side, the secondary side and the heat transfer region. Through a partial calculation using these models, the flows on the primary side and the secondary side are shown to be axisymmetric. Therefore, a sector model is adopted for the calculation model in the heat transfer region. The calculated temperatures in the IHX are compared with the measured results using the IHX in the Monju reactor. Good agreement is obtained for the predicted outlet temperatures and temperatures on the shell surface. As a result of the CFD calculation, it is evaluated that a heat transfer in the lower plenum on the secondary side is dominant under the low flow rate conditions. This fact contributes to lower the heat transfer coefficient in the IHX when the standard heat exchanger theory is applied to calculate the overall heat transfer coefficient between the primary and the secondary sides.

• 出版日期2015-11-2