Study on Heat Transfer Capacity of the Solar Horizontal Heat Pipe

In order to study the heat transfer performance of solar horizontal heat pipes, a high-precision experimental apparatus for heat transfer capacity of the solar horizontal heat pipe was developed. It was proved that the system heat balance of the experimental apparatus is less than 10% and the relative error ofthe heat transfer capacity was less than 6%. By heat transfer capacity test, it was shown that when the liquid level height of working fluidwas about 19% ∼ 22% of the inner diameter of solar horizontal heat pipes, the optimal heat transfer performance was obtained.In addition, the heat transfer performance of solar horizontal heat pipes was affected adversely by the installation angle.