Preheating of Fresh Air : Fresco SL

Fresco SL : Solar Preheating on Flat Roofs

The Fresco SL solar air heater is designed for mounting on flat roofs to preheat outside air just before it enters the ventilation unit, with no impact on the building’s architecture.

Because it is mounted on spacious flat roofs, the Fresco’s major advantage over wall installations is that it can always be designed to face due South, and inclined at an optimal inclination of 70°, to maximize solar warm air output during the cold season.

How the Solar Collector Works

Technical Data

Technical Sheet

Fresco SL	SI Units [IP Units]
Technical Data
Solar air collector type	Transpired unglazed collector
Working fluid	Air only
Main use and purpose	Preheating of outdoor air
Solar area	6 m2 [65 ft2]
Possible airflow range	170 m3/h à 1000 m3/h [100 CFM à 600 CFM]
Pressure drop @ maximum throughflow	370 Pa [1 in H2O]
Maximum temperature rise above ambient	50 °C [90 °F]
Peak solar efficiency, rated	90
Weight	40 kg [100 lbs]
Absorber panel
Panel material	Aluminum alloy 99.8, Temper H18
Absorber panel thickness	0.7 mm [0.028 in]
Panel surface treatment	Highly selective VDP coating
Available colors, selective	blue, black
Absorbtivity in thermal spectrum	≥94%
Emissivity in thermal spectrum	≤3%
Panel porosity	1-4%
Mounted collector system
Typical distance between 2 rows*	390 mm [15.3 in]
Typical inclination to the horizontal	70°
Optimal orientation	Sud ou sud-est
Minimal hieght of the collector above roofline	900 mm [36 in]
Required maintenance	none
Freeze protection	N/A
Overheating protection	N/A
Ratings & certifications
Solar Rating Certification Corp. certificate no	SRCC 10002111
Test laboratory	Fraunhofer ISE, Germany
*Note : Calculate at 45° of latitude

Efficiency Curve of the Solar Collector

Pressure drop curve of the collector

Dimensions of the collector

Project Photos