It is found that the average daily-efficiency results from drainage method can only reflect the transform capability between solar light and heat of the system,but the results from water-mixing method can not reflect the capability and can only gain their tanks\' efficiency.

Thermal Performance Study on the All-glass Evacuated Tubular Water Heaters(Ⅲ)——Analysis of accessible factors on the daily average efficiency;

Thermal Performance Study on Evacuated Tubular Water Heaters(Ⅱ)——Comparing and analyzing of instantaneous efficiency and daily average efficiency;

Relation between average daily efficiency of evacuated tubular solar water heaters and the mass area ratio is analzed,and method of correction to average daily efficiency is pressented.

Results show that mass area ratio (MAR) is a primary factor to average daily efficiency and instantaneous efficiency curve of tubular solar water heaters is not straight line.

The effect of mass area ratio(MAR)of all glass evacuated tubular solar water heaters is discussed on the average daily efficiency and closing temperature of water.

In the case that transistors are ideal, efficiency cure of G-type amplifier is calculated, then its approximate average efficiency according to practical situations is evaluated, and the detailed value relationship between power supply efficiency and group number of power supply in G-type amplifier is figured out.