hardware is shown in the figure below. Water enters the pump as a saturated liquid at
50°C and is pumped up to 0.2 MPa by a small centrifugal pump. The boiler, powered
by solar collectors, evaporates water at 0.2 MPa, and saturated vapor at this pressure
enters the small turbine. The steam leaves the turbine with 6% liquid at 50°C and is
subsequently condensed. The flow rate is 140 kg/hr and the pump is driven by a 400
W motor operating at full load. Making suitable idealizations, determine the power
output of this plant (net power) and the energy conversion efficiency (net shaft-work
output to energy transfer to fluid in the boiler), and estimate the area of solar collectors
that would be required, assuming the collectors can pick up 800 W/m².
QSOLAR
Pump
We
1
1
Boiler
Condenser
Qc
Figure 1: Schematic for problem 5.
4
Turbine
Wp
Fig: 1