Table 4 shows that although increasing the value of Mw/Ac can
help obtain more useful thermal energy and electrical energy, the
temperature-rise of the water will decrease, and auxiliary thermal
energy required to cover the hot-water load will increase. For
example, in Lhasa, when the value of Mw/Ac is equal to 64.5 kg/
m2, only 714.21 MJ/m2 of auxiliary thermal energy is required,
and the solar contribution of the system can reach 0.805. However,
when the value of Mw/Ac reaches 103.2 kg/m2, a large auxiliary
thermal energy of 2463.49 MJ/m2 will be required, and the solar
contribution of the system is only 0.575.