# hw_7 - J Buongiorno Spring 2007 22.313J 2.59J 10.536J...

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22.313J, 2.59J, 10.536J THERMAL-HYDRAULICS IN POWER TECHNOLOGY Homework Set 7 1. Natural circulation BWR Solve Problem 3-1 in Nuclear Systems, Vol. II. Hint: 1) Neglect subcooled boiling effects, i.e., no steam is generated in the core before the location at which T b =T sat . 2) To calculate the friction pressure drop in the core and chimney use HEM with f TP =f o =0.02. 3) Use the properties in Table 1. Table 1. Saturation properties of water at 7.1 MPa Parameter Value T sat 286.6 ° C ρ f 738.4 kg/m 3 ρ g 36.9 kg/m 3 h f 1,272 kJ/kg h g 2,771 kJ/kg C p,f 5.45 kJ/(kg ° C) C p , g 5.33 kJ/(kg ° C) μ f 9.5 × 10 -5 Pa s μ g 1.9 × 10 -5 Pa s k f 0.563 W/(m ° C) k g 0.064 W/(m ° C) σ 0.0175 N/m 2. Pump seizure in a single-phase loop A water flow loop is used to generate heat transfer and pressure drop data in single-phase flow. The loop, shown in Figure 1, operates at atmospheric pressure and consists of four identical round tubes of 3 cm ID and 4 m length. The fluid is heated to 60 ° C at the bottom of the right vertical tube and cooled down to 20 ° C at the top of the left vertical tube. The relative elevation of the thermal centers of the heated and cooled sections is 3.5 m.

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hw_7 - J Buongiorno Spring 2007 22.313J 2.59J 10.536J...

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