The schematic diagram of the solar collector system is shown in
Fig. 4. The two solar water heater systems have a tank for absorbing
the heat energy, respectively. The capacity of the tank is about 100
Lit. In the nanofluids solar cycle, one heat exchanger was used inside
the tank. So the nanofluids can transmit the heat load of the
solar cycle to the water. While in the water solar cycle system, the
tank has no heat exchanger. Two glass rotameters were used to
measure the mass flow rate of working fluid in the solar system.