SolarDuct® is a modular rooftop solar air heating system based on the highly efficient, award winning SolarWall® Transpired Solar Collector.
The system has been specifically developed for use in rooftop applications, to enable the technology to be adopted for use in areas where it may not be feasible, or even suitable, to utilise the traditional wall mounted system.
As with the SolarWall® technology, the SolarDuct® system harnesses the suns energy to heat the ventilation air supply before it enters the main air handling plant. Manufactured in a standard module size, the number and length of SolarDuct® units required for each application is calculated based on the quantity of fresh air that is required and the energy and temperature demands of the building.
Depending upon available roof space, the SolarDuct® units can be specifically orientated for maximum system performance; they are not limited to the fixed orientation of the building. SolarDuct® is the perfect SolarWall® alternative for applications where the air handling plant is located on the rooftop.
Features & Advantages
- Collector efficiencies of up to 80%
- Significant reductions in CO2 emissions
- Quick and easy to install modular rooftop units
- Can be optimised to meet site and building conditions
- Simple to integrate into existing air intake system
One of the main drawbacks of a solar photovoltaic (PV) system is the drop in efficiency experienced as the operating temperature of the PV cell increases. Standard Test Conditions (STC), rate the performance of PV modules at a cell temperature of 25°C, however, closer examination has found that most crystalline modules are subject to a 0.5% reduction in power output for each 1°C of temperature rise above this value. Given that roof temperatures in the UK can exceed 60°C during summer months, the actual operating efficiency of installed PV systems is often significantly less than the rated output.
The SolarDuct® technology can help to improve efficiency by providing a combined PV/Thermal cogeneration system, where the SolarDuct® modules double up as the PV racking system. In this scenario, the PV modules are mounted directly onto the front face of the SolarDuct® units, allowing the excess heat generated by the PV‘s to be effectively captured by the SolarDuct® collector. This excess heat is then ducted into the nearest rooftop air-handling unit where it is used to help offset the building’s heating load.
Controlled airflow ensures uniform cooling over the entire panel surface and improvements of as much as 10% in PV power output, per annum have been recorded and independently verified. Also, with both electrical and thermal energy produced from the same roof space, it solves the problem of which solar technology to use, while at the same time maximising potential income from the roof area.