Читать книгу Materials for Solar Energy Conversion - Группа авторов - Страница 29

One of the developed methods in place of conventional solar collector is the evacuated solar collector. The main aim of developing this type of design is to improve the efficiency rate, to reduce heat transfer loss rate, to improve the working conditional temperatures, and to minimize the constructional size of collector.

This method is designed by creating the vacuum among absorber plate and glass cover. A glass tube acts as a cover and plays important role to withstand pressure difference created in a system. There are numerous evacuated collector designs developed. Solar water heating systems used borosilicate glass cover as vacuum tubes to absorb radiation energy from the sunlight.

The main characteristic features of evacuated solar tube collector are as follows:

 ✓ Better quality glass tubes

 ✓ During winter and cloudy seasons, solar evacuated tube collector system gives a good heating performance.

 ✓ Insulation method is highly installed to maintain temperature even for a higher range of water.

 ✓ Compact design in size

 ✓ Maintenance is very easier and simple installation

 ✓ Less labor operating cost

 ✓ Eco-friendly system