Heat pipe collector which can absorbs thermal energy from the sun and then converts it into available heat. The heat is usually absorbed by water, or a anti-freeze liquid and water mixture, which can then be used to supplement hot water heating, space heating and even space cooling.
heat pipe solar collector
Collector structure
The solar collector comprises three main parts:
Evacuated Tube
Absorbs solar thermal energy and converts it to available heat. Vacuum between the two glass layers insulates against heat loss.
Heat Pipe
Copper pipe that transfers the heat from within the evacuated tube up to the manifold.
Insulated box containing the copper header pipe. The header is pair of contoured copper pipes with dry connect sockets that the heat pipes plug into.
How it work:
Step 1: The absorber coating on the inner glass tube absorbs sunlight and converts it into heat
Step 2: Steam forms inside heat pipe which transfers heat rapidly up to the manifold.
Step 3: A pump circulates water or heat transfer fluid through the header pipe, carrying heat  to the storage tank.
Advantages of heat pipe collector v/s flat plate collector v/s evacuated tubes v/s u type solar collectors
  Heat pipe collector Flat plate collector Triple Evacuated tubes U type solar collector
Temperature upto 100 Deg C Upto 80 Deg C Upto 65Deg C

upto 100 Deg C

Water contact no yes yes


Max operating pressure 6bar 3bar < 0.5bar


Life 15yoear 15years NA 15years
Heat loss less more less Less
Max Sun exposure Throughout the day Only in the mid day Throughout the day Throughout the day
Area required Less more less less
In case of Descaling Only header pipe needs to be cleaned.Easy to clean as header  dia 22mm Entire absorber need to be cleaned including header.  Time consuming job Tubes may break during cleaning and reinstallation Entire header and u pipe needs to be cleaned. Time consuming job