The Analysis Of Intermediate Heat Exchanger With CFD Methodology

The intermediate heat exchanger(IHX)plays an important role in the field of nuclear power plant,and its safety margin could strongly affected by the flow distribution of secondary flow inlet.As a result,the size of secondary inlet is crucial in thermal design.However,the IHX contains thousands of heat exchanger tubes,and it takes larger time to simulate each tube accurately.Other than that,there are plenty of delicate devices in the nuclear power plant,so it would take too much time to simulate actual model.Although system code could solve problems effectively,it could not detect local deformation.On nuclear safety application,how to save time and receive specific results in an efficient way is necessary.Therefore,the porous media model and the heat exchanger model from computational fluid dynamics(CFD)were applied in this study.The methodology not only can save much time than actual model but also receive more specific results than system code.The porous media model provides an effective way to resolve the problems.It has been widely used and been verified in nuclear saftery recently The heat exchanger model from ANSYS Fluent,the computational fluid dynamics(CFD)software,can simulate heat transfer of the IHX and resolve the problem s of simulating large amounts of the heat exchanger tubes in the engineering system.Two models were used to simulate the temperature distribution and pressure field of the IHX.The results show that the smaller size of secondary flow inlet transfer heat more smoothly,and the wall temperature gap between the inner and the outer side decreased.Besides,the results of pressure lose shows the greater size of primary flow inlet case gain less pressure drop.