PV module cooling

British scientists have developed an experimental compressed air system for the simultaneous cleaning and cooling of PV modules. The system was built with a compressed-air unit which was made of a compressor, an air tank, and an airflow regulation valve, and a series of nozzles. The technique was tested on a PV system located in northwestern India.

A British-Egyptian research group has tested the use of hydrogels beads for PV module cooling. The micro-sized particles were saturated with aluminium oxide (Al2O3) water-based nanofluids and placed below the simulated PV panels. The experiment showed, according to the scientists, that the hydrogels beads were able to significantly reduce the temperature by between 17.9 and 16.3 degrees Celsius.

Scientists in Pakistan have proposed a new passive cooling technique which they claim can improve a module’s open-circuit voltage by up to 12.97% and its efficiency by up to 2.08%.

A US research team claims to have demonstrated that packing PV modules in close proximity can exponentially increase convective heat transfer of a solar park. The scientists analyzed three different module arrangements and compared them to the common row-organized panel configuration.

An international research team has analyzed all existing cooling technologies for PV panels and has indicated the current best options and future trends of research. According to its findings, active water cooling, although expensive and not particularly practical, is the most effective cooling technique while passive cooling systems, despite being easy to apply, have still limited possibilities.