Because of the different geographical position, the differences of parameters are larger on the solar irradiance,
ambient temperature and water temperature. Therefore, the same systems have greater differences in the earnings for
different five cities, which shows in Table 2. Although the solar energy resources is very rich in Xining, the ambient
temperature is very low and the thermal efficiency is only 0.283 throughout the year, the auxiliary heat consumption
per day is 3.88MJ, but, the power generation efficiency is higher, the average monthly total generating capacity is
39.32kW•h. Beijing and Changchun’s meteorological parameters are similar to Xining, the total radiation intensity
slightly lower, but the ambient temperature is lower in Changchun, therefore, the thermal efficiency in Changchun is
slightly lower than Beijing and Xining. Annual irradiance in Nanjing is smaller, average collect thermal efficiency is
only 27.3%, the average power output is only 1.02 kW•h. Although the total irradiance is very low in Haikou, but
the annual ambient temperature is high, as shown in Fig.5, the other four cities thermal efficiency are greatly
affected by the month change, only Haikou thermal efficiency is more than 30 percent throughout the whole year.
The total generating capacity is lower than other cities