TECHNICA PARAMETERS OF VACUUM TUBES FOR SOLAR HEATER

TECHNICA PARAMETERS OF VACUUM TUBES FOR SOLAR HEATER:

Vacuum or Evacuated Tubes are made from ultra-strong and heat resistant Borosilicate glass with a double wall construction. The glass on the inner tube is coated on its outer surface with an absorbant coating, and on its inner surface with a reflective coating. Inside each tube all air is removed as a vacuum space.And a copper heat pipe is located through the centre of the tubes. Most of radiation (i.e heat) from the sun is absorbed by this sealed heat pipe which contains an anti-freeze type liquid.