Evacuated heat pipe solar collector

✍ Scribed by F. Mahdjuri

• Book ID: 103069577
• Publisher: Elsevier Science
• Year: 1979
• Weight: 661 KB
• Volume: 19
• Category: Article
• ISSN: 0013-7480
• DOI: 10.1016/0013-7480(79)90004-4

✦ Synopsis

A tubular evacuated solar collector with rectangular performance characteristics is introduced. The heat transfer from the absorber plate with selective coating to the water tubing occurs via a heat pipe system. In order to avoid any delay in the operation of the heat pipe due to superheating of the vapour, we have introduced a trap mechanism for the condensed liquid. To avoid the disadvantage of the high no-load condition of the vacuum collectors we have used the physical features of the critical point of the heat pipe working fluid.

Above the critical temperature, Tc of the working fluid the condensation effect will disappear. This means that above Tc the heat transfer property of a heat pipe will vanish. This will cause only a slight increase of the condenser temperature above Tc of the liquid used. For our heat pipe system we have chosen working liquids with critical temperature between 95-115°C.

Solar collector Heat pipe Critical point Selective coating Rectangular characteristics Economical evaluation