relatively large operational solar chimney power station exists in the Jinshawan Desert, Wuhai, Inner Mongolia, China.8,9 This plant was operated and connected to the grid in October 2010.
It was reported that for a 300 MW coal-fired thermal power plant, 1 °C increase of the cooling water temperature could induce the decrease of the power plant efficiency by
Roof-mounted close-coupled thermosiphon solar water heater. The first three units of Solnova in the foreground, with the two towers of the PS10 and PS20 solar power stations in the background.. Solar thermal energy (STE) is a form
These technologies can be summarized into three categories: (1) large-scale and higher parameters coal-fired power generation technologies, including 620/650/700 °C ultra
In the fields of heat transfer and plant canopy flow, previous work has shown that system-scale arrangement modifications—e.g., variable spacing, barriers, or windbreaks—can
Windbreak walls for solar farms. Iasol has developed a new way to protect solar plants in windy conditions. The Spanish developer said the solution barely has an impact on project costs or output, while preventing
Parabolic reflectors, also known as parabolic troughs, are widely used in solar thermal power plants. This kind of power plants is usually located on desert climates, where the combined
However, the negative effect of the crosswind can be turned into positive in small natural draft cooling towers by introducing windbreak walls that guide the air mobilised by crosswind through the heat exchangers. When windbreak walls are used, the results show that the tower performance improves with increased crosswind velocity.
Wind break walls, by using either experimental or numerical method , , were found to improve the thermal performance of natural draft cooling towers under windy conditions. However, all the studies above focused on either Heller-type or surface-condenser-type indirect large natural draft cooling towers with heights above 100 m.
The solution consists of a wall made of a high-density polyethylene mesh. Prior to the installation of the windbreak wall, researchers analyzed wind velocity by using computational fluid dynamics. Iasol now plans to replicate the windbreak solution study in two PV projects it is going to build this year.
In the model with windbreak, three solid, zero-thickness walls are placed in the tower bottom with equal separating angles of 120°. The heights of the walls are equal to the inlet height of tower, similar to the wall proposed by Du Preez and Kröger .
When windbreak walls are used, the results show that the tower performance improves with increased crosswind velocity. laminar, effective, turbulent thermal conductivity, respectively (W m −1 K −1)
With no windbreak walls, the air flows directly across the tower base with significant vortices activity being observed inside the tower. By contrast, towers with windbreak walls experience a smoother and more uniform air flow inside the tower. This improvement leads to a difference in the distribution of air temperature.
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