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stmbtwle

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Reply with quote  #21 
It just gets better and better. I just realized that a floating array could be made to track the sun, with a drive unit and some cables...

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SolarInterested

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Reply with quote  #22 
Another possible benefit  - a ready supply of water to clean the panels:
http://www.solardaily.com/reports/Floating_solar_power_new_frontier_for_green-leaning_water_utilities_999.html

"
Dirt is another enemy of solar panels. Wind-blown dust inevitably collects on panels, preventing some of the sun's energy from reaching photovoltaic cells. This can reduce energy output by 20 percent or more. Most ground-mounted solar arrays get cleaned only two or three times a year.

Helming's company has rigged its floating panels with a simple sprinkler system to clean the panels using water drawn from the reservoir underneath. It cleans the panels every day.

"We're curious to look at the data ourselves and see if we actually reap those ancillary benefits," said Kelly Rodgers, energy program manager at the San Diego County Water Authority."

The potential reduced evaporation benefits are impressive too:

"
A University of California, Davis study in 2015 found that covering the aqueduct with solar panels would more than pay for itself. It could also prevent over 9,000 acre-feet of water evaporation per day. On an annual basis, that's equal to the entire capacity of Lake Oroville, the state's second-largest reservoir.

The study found that mounting solar panels on just a single 80-mile stretch of canal serving the Bay Area would avoid water losses worth $1 million annually."


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colinmcc

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Reply with quote  #23 
Thanks for the link to an interesting article!
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Reply with quote  #24 

https://arstechnica.com/science/2018/11/floating-solar-is-more-than-panels-on-a-platform-its-hydroelectrics-symbiont/

Floating solar is more than panels on a platform—it’s hydroelectric’s symbiont

Floating solar offers a wide range of benefits to hydroelectric dams.

The World Bank notes that one of the earliest hydroelectric and solar pairings exists at the Longyangxia hydropower plant in Qinghai, China. Here, however, solar installations were built out in 2013 and 2015, so the panels are sited on land. But the hydro/solar combination still offers insight into how floating solar could work in other areas. "The hybrid system is operated so that the energy generation of the hydro and PV components complement each other," the World Bank writes. When the solar panels are producing enough energy, Longyangxia's hydroelectric plant cuts back the amount of water that goes through the turbines, which results in more water behind the dam for operation during late nights and early mornings.

The market for floating photovoltaics has been growing. Until this year, no floating solar systems had more than a 100 megawatt peak capacity, but as of 2018, several 100 MW floating solar systems have been connected to the grid, the largest being a 150 MW floating plant.


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Both temperature rise and airflow are integral to comparing hot air collectors
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