hw_5 - J. Buongiorno / Spring 2005 22.313J, 2.59J, 10.536J...

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J. Buongiorno / Spring 2005 22.313J, 2.59J, 10.536J THERMAL-HYDRAULICS IN POWER TECHNOLOGY Homework Set 5 Simplified Thermal Analysis of the PWR Hot Channel The fuel pin geometry for a standard Westinghouse PWR is shown in Figure 1. The heated length is 3.66 m. Consider the following operating conditions, which apply to the hot channel: Pressure: 15.5 MPa Inlet temperature: 285 ° C (corresponding to an inlet enthalpy of 1263.4 kJ/kg) Mass flux: 3,500 kg/m 2 s Linear power: 30 kW/m 1) Assuming axially constant linear power, develop a numerical model to calculate the following parameters in the hot channel: Axial distribution of the coolant enthalpy Axial distribution of the bulk temperature Axial distribution of the equilibrium quality Axial location of the onset of nucleate boiling ( Hint: use the Davis-Anderson model, and verify that the size of the nucleation sites is reasonable, i.e., <10 μ m). Axial distribution of the wall temperature (
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hw_5 - J. Buongiorno / Spring 2005 22.313J, 2.59J, 10.536J...

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