Review on Enhancing the Performance of an Evacuated Tube in Solar Collector using Heat Pipes

Solar energy is a glowing light and heat from the sun that is hardnessed using a variety of ever-developing technologies for instance solar heating, photovoltaics, solar thermal energy, solar architecture and artificial photosynthesis. The heat pipe is a modern device capable of transfer large quantities of heat throughout relatively small cross-sectional areas, and with very little temperature differences. Evacuated tube is the Most vacuum tube collectors in use in middle Europe use heat pipes for their core instead of passing liquid directly through them Direct flow is more widespread in China. Evacuated heat pipe tubes (EHPTs) are composed of various evacuated glass tubes each containing an absorber plate attached to a heat pipe. The heat is transferred to the fluid (water or an antifreeze mix�stereotypically propylene glycol) of a domestic hot water or hydronic space heating system in a heat exchanger called a "manifold". The manifold is wrapped in insulation and enclosed by a protective sheet metal or plastic case. The vacuum in the internal portion of the evacuated tube collectors have been confirmed to preceding more than 25 years, the reflective coating designed for encapsulated in the vacuum inside of the tube, which will not damage until the vacuum is lost.