Exact(3)
The reactor consists of a compound parabolic concentrator with a tubular borosilicate glass receiver.
Two of them had glass receiver tube covers, one with an additional flat cover in the aperture plane and the other one without it.
Improvement over previous simpler models included a non-uniform receiver temperature and temperature difference between the glass, receiver cover, and thermal fluid.
Similar(57)
It has been observed that, with glass cover, receiver temperature has been increased by 23%, which assures hotter water temperature at the outlet.
Instantaneous efficiency of 51% has been achieved with the glass-covered receiver.
Figure 5 shows that, with glass-covered receiver, it is possible to achieve more useful heat gain.
It has been observed that, with glass-covered receiver, outlet water temperature and temperature gradient increase by 29%and68%8%, respectively.
When the heat loss coefficient decreased by 70%, the instantaneous efficiency of the collector still increased by 13% with the glass-covered receiver.
Temperatures measured in the receivers' glass envelope did not match those with hydrogen being the gas in the annulus.
The cleanliness is followed (in this sequence) by the mirror reflectance, the glass tube transmittance, the receiver tube absorptance and, finally, by the receiver tube heat loss characteristic.
In comparison, the receiver with glass cover yields much higher outlet water temperature than the receiver without glass cover.
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