3. Test results of SACH-k2
SACH-k2 is tested outdoor with solar heating. The performance
of generator liquid level control, power consumption of
ECS cooling tower, evaporator temperature control of ECS, and
overall system performance were measured.
3.1. Generator liquid level control of ECS
The liquid level control test in ECS was performed with solar
heating. In a variable weather with high fluctuation of solar
irradiation, the liquid level was controlled between 11 cm and
12.5 cm for the level setting at 12 cm, about 8 to 4% error, as
shown in Fig. 15. Only slight level variation occurs during the
abrupt change of solar irradiation. In partly-cloudy weather
with moderate fluctuation of solar irradiation, the liquid level
was controlled between 11.6 and 12.4 cm for the level setting
at 12 cm, about 3% error, as shown in Fig. 16. This indicates
that the liquid level control system is robust with respect to
the abrupt change of solar radiation.