how to calculate heat loss coefficients in LFR systems ?

Dear Gentlemen,

Could you please give an example about how heat loss coefficients are calculated in linear
fresnel reflector system.

Regards,
Rahmi

Dear Rahmi,

The polynomial heat loss equations in SAM's linear Fresnel model calculate thermal loss from the receivers as a function of the difference between the heat transfer fluid (steam) temperature and ambient dry-bulb temperature. The equation coefficients represent the heat loss characteristics of a particular receiver design. SAM's default values are for the Novatec Solar Boiler.

For an example of how coefficients for these equations can be derived, you can refer to the results from Sandia National Laboratories' tests of the SEGS LS-2 solar collector in Kolb et al (1994) ( PDF 5 MB ).

Best regards,
Paul.

Dear Mr. Paul Gilman,

Thank you very much for your interest and patience.

Kind Regards,

Rahmi