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transmission loss which is about 7% in UK grid transmission (Sinisa Stankovic et al.
2009). Various design alternatives are tried and tested for urban context. Two main
designs are Horizontal axis wind turbines (HAWT) and vertical axis wind turbines
(VAWT). Wind turbine systems that are within 100Kw are considered to be small wind
systems. Wind turbines are further divided in to three categories based on its power
generation capacity- Micro wind systems between 0 – 1.5Kw, small wind systems
between 1.5Kw – 15Kw and small-medium wind systems between15Kw – 100Kw
(Renewableuk 2011). A 2m diameter HAWT in a location where the annual wind speed
is 5.5m/s can generate up to 40% of the energy demands of a 100m
2
house (Sinisa
Stankovic et al. 2009).
UK’s market size for small wind systems increased by 70.9% between 2009 and 2010
reaching £29.27million (Renewableuk 2011). It is estimated that the market size would
increase by 167% in 2011 reaching £78.22m. This rapidly increasing market trend shows
the interest from the government and public to invest in Small wind systems. The annual
deployed capacity of small wind systems was 42.97MW by the end of 2011 which is
estimated to reach 1300MW by 2020. Achieving this will only be possible with
appropriate incentives through policies. Reduction in the technology cost as the market
grows. Increase in the fuel prices from the grid will increase the use of small wind
systems. Wind turbine market can see significant growth due to windy weather in
Scotland.
ZEMCH109
ZEMCH109 is a project proposed by NRGStyle and ZEMCH network. NRGStyle is an
affordable sustainable building development company that designs multi generational
integrated homes. The proposal is to demolish the extension of the existing house on the
site and build a 3 storey building. The site is located in Prestwick, South Ayrshire. This is
a zero energy house, with passive saving of energy, active generation of energy through
solar photovoltaic thermal panels and potential to install a wind turbine in the future. The
site is 1km away from the coastline. It is an end terraced house facing a football pavilion
in north-west direction and low raised low density housing in the other three directions. A
swift wind turbine was installed on the existing building on the same site in March-April,
2011.
SWIFT
TM
wind turbine (Fig.1) specification (Renewable Devices 2011):
•
Upwind horizontal axis with patented diffuser ring
•
Swept area 3.5m
2
•
Power output of 1.5KW at 12m/s
•
20 years maintenance free design
•
2.12m injection moulded nano-fibre reinforced polymer
•
Custom designed vibration-absorbing mounting brackets
•
Cut in speed – 3.7m/s (7.6mph)
•
Acoustic emissions <35dB
