Table 5: Capital cost and ten year though life cost of each selection strategy.

Fan diameter (m)Fan efficiencyFan investment cost (£)Motor power (kW)Electricity cost/year (£)Electricity cost (10 yrs) (£)Total fan and running costs (£)Running cost as a percentage of total cost

Strategy 12.571%28.50018532.412217.488245.98888%
Strategy 21.866%23.00021437.493251.582274.98292%
Strategy 32.2469%32.00019033.288223.366255.36687%