2.0 Experimental Analysis
2.1 Experimental Setup
In the present Research work the solar parabolic trough collector receiver tube with heat transfer fluids for various
geometries (with and without inserts) is analyzed and compared with experimental results. Experimental set up
consists of a test section, fluid circulation system, heating arrangement. The schematic diagram is as shown in fig
1.The plain absorber/receiver (test section) is made up of copper having inside diameter 20 mm and outside diameter
22 mm and 1500 mm in length. The tapes are made up of aluminium for different helix angle 30˚, 45˚and 60˚.These
Twisted tape inserts are as shown in fig 1(a). The geometry dimension of tape inserts are as follows: length of each
tap inserts is 1500 mm, width of each tape as 19 mm, thickness of tape: 1mm and 1.5mm.The twisted tape tapes are
in turn inserted into the plain absorber/receiver. The plain absorber/receiver is insulated with asbestos tape to avoid
heat loss to atmosphere. A band heater (of capacity 500 W each) is used as electrical heater which is wounded over
plain absorber/receiver. The insulating material helps to reduce radial losses.