temperature at 38 C. The ECS is shown still running at low
and variable solar radiation.
The result shown in Fig. 21 was from the test performed at
average ambient temperature 28 C and cooling room temperature
26.1 C with additional electric heating load 2.6 kW. It
is seen that the tracking of Te was satisfactory. The ECS is
running well at the periods of unstable solar radiation.
3.4. Overall system performance of SACH-k2
The system performance test of SACH-k2 was carried out with
all the implemented control systems. Cooling fans, evaporator
temperature and MPPT of water pump of solar heating system
were optimized. Fig. 22 shows that the power consumption of
IAC alone was 1087 W. Additional electric heating load 2.6 kW
in the cooling room was applied during the test. The power
consumption of IAC dropped to 600 W in average after ECS
was turned on. Power consumption of IAC saved 44.8%.
Fig. 23 shows that the power consumption of IAC alone was
1030 W with an electric heating load 2.6 kW in the cooling
room applied during the test. The power consumption of IAC
dropped to 561Win average during 11:00e13:15 after ECS was
turned on. Power consumption of IAC saved 45.6%.
Fig. 24 shows the performance of SACH-k2 in cloudy day. In
the beginning, the power consumption of IAC was 1030 W.
Additional electric heating load 2.6 kW in the cooling room