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THERMO_V3_1

Một hồ sơ nhiệt độ xuyên tâm qua một lõi lò phản ứng (giả sử tất cả các kênh dòng chảy chất lỏng làm nguội bằng nhau) về cơ bản sẽ tuân theo phân bố quyền lực xuyên tâm. Các vùng có tỷ lệ thế hệ nhiệt cao nhất (quyền lực) sẽ sản xuất nhiệt và có nhiệt độ cao nhất. Một hồ sơ nhiệt độ xuyên tâm cho một thanh nhiên liệu cá nhân và các kênh làm mát được thể hiện trong hình | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com Heat Transfer HEAT GENERATION However the rate of increase will vary along with the linear heat flux of the channel. The power density and linear heat rate will follow the neutron flux shape. However the temperature distributions are skewed by the changing capacity of the coolant to remove the heat energy. Since the coolant increases in temperature as it flows up the channel the fuel cladding and thus the fuel temperatures are higher in the upper axial region of the core. A radial temperature profile across a reactor core assuming all channel coolant flows are equal will basically follow the radial power distribution. The areas with the highest heat generation rate power will produce the most heat and have the highest temperatures. A radial temperature profile for an individual fuel rod and coolant channel is shown in Figure 17. The basic shape of the profile will be dependent upon the heat transfer coefficient of the various materials involved. The temperature differential across each material will have to be sufficient to transfer the heat produced. Therefore if we know the heat transfer coefficient for each material and the heat flux we can calculate peak fuel temperatures for a given coolant temperature. Figure 17 Radial Temperature Profile Across a Fuel Rod and Coolant Channel Rev. 0 Page 49 HT-02 . Simpo PDFMerge and Split Unregistered Version - http ZZwww.simpopdf.cpm HEAT GENERATION Heat Transfer Volumetric Thermal Source Strength The total heat output of a reactor core is called the heat generation rate. The heat generation rate divided by the volume of fuel will give the average volumetric thermal source strength. The volumetric thermal source strength may be used to calculate the heat output of any section of fuel rod provided the volume of the section is known. Volumetric Thermal Source Strength Q -core vZ fuel Fuel Changes During Reactor Operation During the operation of a nuclear .