Iranian scientists have assessed a new active approach for solar module cooling based on water spraying. Water sprayed from different angles can reduce the operating temperature of PV modules, with limited water consumption. However, the team noted that they have yet to assess the economic viability of the system.
Iraqi researchers have demonstrated the technical and economical feasibility of using shallow geothermal energy to cool PV systems. They tested two different techniques – a closed-loop system and an open-cycle system – to reduce power losses from 30% to up to 4.1%.
The novel technique consists of a PVC pipe with 20 holes that is placed on the top of a PV module and is able to maintain a constant discharge of water. It was demonstrated on an experimental photovoltaic-thermal PV system in which the PV panel was not integrated with the solar collector but connected to it via pipes.
Researchers in Israel have suggested the use of regasification of liquefied natural gas to reduce the operating temperature of PV modules in solar parks located at gas terminals. According to them, the feasibility of such a cooling solution could be strengthened by the fact that both the PV systems and the LNG regasification systems are, separately, mature, economical technologies.
A Pakistani research team has assessed the performance of a passive heat sink cooling technique in two different configurations: one using rectangular fins and one based on circular fins. The rectangular configuration was the best in terms of heat rejection. Modules mounted with this solution had a 6 C lower temperature than modules without cooling systems.
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