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Performance data

Annual system performance of the flat plate collector system installed at BERGER in Austria
Annual system performance of the flat plate collector system installed at BERGER in Austria

The graph shows the monthly amounts of specific solar irradiance (E_GT) on the collector plane, specific useful collector yield (E_coll), and specific heating energy transferred to the production processes through the exchangers for hot water (E_HXh) and feed water (E_HXf) during 2014.

As shown in the figure, around 80% of the solar gains are used for hot water pre-heating, while 20% of the solar gains are used for feed water pre-heating for the steam boiler.
The collector utilization ratio (u_coll) ranges from 7% in winter to 38% in summer. The system utilization ratio (u_sys) varies between 5% and 36% respectively.
The annual specific useful collector yield measured in 2014 reaches 419 kWh/m²a, the specific heating energy transferred to the feed water per-heating of the steam boiler (HXf) amounts to 63.3 kWh/m²a and the specific heating energy transferred to the water heating circuit (HXh) reaches 326 kWh/m²a. The system integration losses (storage, HX and tubing) of 30 kWh/m²a, correspond to 7% of the transferred useful collector heat.

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