An experimental flow loop is constructed to study events in a PWR plant. The core consists of…

An experimental flow loop is constructed to study events in
a PWR plant. The core consists of electrically heated rods and the two steam
generators are simulated by two shell and tube heat exchangers. The vessel is
connected to the heat exchangers by two hot legs and four cold legs. Water
flows from the hot leg in the tubes while the secondary side water is cooled by
a cooling tower. The following flow resistances are measured for this facility
RV = 227 ft-4, RHL = 560 ft-4, RHX
= 369 ft-4, RCL = 767 ft-4. Find the natural
circulation flow a) assuming no pump exists in the loop and b)
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An experimental flow loop is constructed to study events in
a PWR plant. The core consists of electrically heated rods and the two steam
generators are simulated by two shell and tube heat exchangers. The vessel is
connected to the heat exchangers by two hot legs and four cold legs. Water
flows from the hot leg in the tubes while the secondary side water is cooled by
a cooling tower. The following flow resistances are measured for this facility
RV = 227 ft-4, RHL = 560 ft-4, RHX
= 369 ft-4, RCL = 767 ft-4. Find the natural
circulation flow a) assuming no pump exists in the loop and b) considering four
non-operating pumps on each cold leg, RPump = 1793 ft-4.
Other design data are: core thermal power = 178 kW, core inlet temperature = 38
C, vertical distance between the core and the heat exchanger thermal centers =
0.75 m, average density = 985 kg/m3, average specific heat = 4.18
kJ/kg K, and _ = 0.37E-3 1/K.

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