Preheating of Fresh Air : Calento SL

Calento SL : Solar Heating of Outside Air

The solar air collector Calento SL uses a surface that has a very low emissivity (3% versus the 95% for black paint) for an optimal heating of the air. Thanks to its certified maximum efficiency of 90.1%*, the Calento SL enables the air to be heated up to a maximum of 50°C above the ambient temperature.

Always being connected to a heating or ventilation system, the Calento SL can be applied to a multitude of HVAC system configurations to generate tangible energy savings, year after year, over several decades.

How the Solar Collector Works

General function

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Connected to a Make up

Connected to a rooftop unit

Connected to stand-alone system

Air to water heat pump assistance

Air-source heat pump assistance

Connected to dessicant or heat recovery wheel regeneration

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Self-cooling in summer time

Nighttime sub-cooling

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Collector manufacturing

Technical Data

Technical Sheet

Calento SL	SI Units [IP Units]
Technical Data
Solar air collector type	transpired, open loop, unglazed
Working fluid	air only
Main use and purpose	Preheating of outdoor air
Peak solar efficiency, rated	90.1%
Maximum power output	901 W/m² [285 BTU/hr per ft²]
Maximal air throughflow per collector surface	185 m³/h per m² [10 pcm/ft²]
Pressure drop @ maximum throughflow	125 Pa [0.5 in H₂O]
Maximum temperature rise above ambient	50 °C [90 °F]
RETScreen simulation model performance factor	1.35
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, on site
Plenum cavity depth, standard	10 to 20 cm [4 to 8 in]
Framing parts, steel	1.31 mm [18 ga]
Weight per surface area, including framing	5 kg/m² [2 lbs/ft²]
Maintenance requirement	none
Freeze protection	unnecessary
Overheating protection	unnecessary
Ratings & certifications
Solar Rating Certification Corp. certificate no	SRCC 10002111
Solar Keymark certificate no.	011-7S3104 L
Test laboratory	Fraunhofer ISE, Germany

Efficiency Curve of the Solar Collector

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Description

Over the years, Trigo has developed a series of surface finishes, perforation patterns and profiles to maximize the thermal output the Calento SL series and answer the most stringent needs of engineers and architects.

For engineers, rated performances allow for a maximum temperature increase of 50°C above ambient, regardless of exterior temperature or time of the year. This enables the integration of the Calento SL in applications like outside air preheating, space heating, heat pump assistance, drying, dessicant wheel regeneration, process heat and any application where warm air is needed.

For architects, selective colors include blue (the natural optical outcome of our vapor deposition process) and black, which was created specifically for building integration. Three different perforation patterns are available, as well as four different standard profiles. For special projects, a further selection of about 20 profiles is available. We exclusively use aluminum as substrate material for its superior thermal conductivity and properties against corrosion, as perforations cause the metal to be exposed.