
Low Energy Data Centre
Renewables
As said in the design brief we want as much green energy as possible for our data centre. After a study in which we have determined that Photovoltaic panels are more efficient than the wind turbines for the space we have and our location we can now evaluate the part of green electricity in our consumption.
We took the solar data from Falkirk and we made the assumption of 50,000m² of solar panels. This correspond to ¾ of the site area plus the server room roof (around 2000 m²). We made the calculations with this model of solar panel:
LG300A1C-B3
With an efficiency of 18.3% it’s one of the most efficient PV on the market.
Dimensions: 1640 x 1000 x 35 mm / 64.57 x 39.37 x 1.38 in
We used this formula to have an estimation of the power output from the solar panels over a year estimating
at each hour how much energy we get and iterates it throughout all the year:[1]
Energy output (W) =H*A*R*PR
Where:
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H is the sum of the total direct radiation and the total diffuse radiation (W/m²)
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A is the panel total Area: 52,000 m²
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R is the panel ratio: 0,183 for the LG300A1C-B3.
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PR is the performance ratio of our panel, e.g. 0.75.
For one year:

Figure 1 : PV panels

Table 1 : Renewables calculation
We managed to supply 14% of our data centre with green energy. It may seems to be a small amount of energy but we have to keep in mind that our building consumes a huge quantity of electricity (around 52GwH!). In comparison, a city of 10,000 people in the United Kingdom consumes yearly 52GwH.
References
[1]Photovoltaic Software. (2014). PV Solar Energy calculation. Available: http://photovoltaic-software.com/PV-solar-energy-calculation.php. Last accessed April 2015.