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Question: 123 evaluation of pool boiling conditions at high pressure section...

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12.3. Evaluation of pool boiling conditions at high pressure (Section 12.4) . A manufacturer has free access on the weekends to a supply of 8000 amps of 440 V electric power. If his boiler operates at 3.35 MPa, how many 2.5 cm diameter, 2 m-long electric emersion heaters would be required to utilize the entire available electric power? He desires to operate at 80% of critical heat flux. 2. At what heat flux would incipient boiling occur? Assume that the water at the saturation temperature corresponds to 3.35 MPa. The natural convection heat flux is given by 2.63(AT)125 kW/m2 p 3.35 MPa 240° he 1766 kJ/kg Pe 813 kg/m P 16.8 kg/m3 σ-00286 N/m k# 0.0628 W/m°C Assume that the maximum cavity radius is very large. You may use the Rohsenow correlation for nucleate pool boiling taking 0.0130 in Equation 12.18c. Answers . N-6 (based on Ce 0.18 in Equation 12.31) 2. q 4.19 kW/m2 Edit: Use following equation: Hide comments (1)

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