22.313J, 2.59J, 10.536J
THERMAL-HYDRAULICS IN POWER TECHNOLOGY
Tuesday, May 22
, 2007, 9 a.m. – 12 p.m.
Problem 1 (35%) – Steady-state natural circulation in a steam generation system
Saturated steam at 3 MPa (properties in Table 1) is used in a certain factory.
The steam is
generated by the system shown in Figure 1, which consists of a natural gas-fired heater, a riser of
, a steam separator of form loss
, and a downcomer.
The makeup flow can be assumed
to be saturated water at 3 MPa. The riser and the steam separator have the same flow area,
Dry saturated steam to the factory
Figure 1. Schematic of the steam generation loop
Using the conservation equations and their constitutive relations, find a single equation
from which the mass flow rate in the loop,
, could be found as a function of the heat
, and the parameters
for the two limit cases
. Do you think the
) could have a maximum between these two limits? Explain your