The results show that annual energy gain for evacuated collector tubes with the semicylindric absorber is 15.9% higher than the flat absorber, annual energy gain with the cylindric absorber is 26.2% higher than the flat absorber.

• 结果表明：半圆柱吸热板真空集热管的年能量收益比平面吸热板高15.；9%25； 圆柱吸热体真空集热管的年能量收益高于平面吸热板26