Thermal modelling of parabolic trough collectors - Solar Energy Sciences and Engineering Applications - page 188

Figure 6.3.1 Comparison of measured against predicted thermal efficiency with vacuum in receiver
annulus.
Figure 6.3.2 Comparison of measured against predicted heat loss with vacuum in receiver annulus.
from the Australian company NEP-SOLAR and has the characteristics presented in
Table 6.3.1.
The collector is installed at the roof of the laboratory and has a length of 12.2 m
(one-half of the standard module). It consists of galvanised steel mounts, lightweight,