Designing wind turbines for a country that isn’t windy

By Robert van Waarden on 10 July 2012

Climate Central

Part 10 in a series

“I know that 70 per cent of the area in the world has a low wind speed. I thought, if we want to promote the wind machine, 70 per cent is a lot of the world,” says Dr Wirachai Roynarin (or Dr Roy as he is more commonly known).

Dr Roy is a Lecturer in Mechanical Engineering at RMUTT in Bangkok and owner of Prapai Technologies, a company that specialises in low wind-speed turbines. He grew up in a small farming family, where he learned to respect the land, before going to England to study. He returned to Thailand believing he could help his country, and he set his sights on the wind.

He is excited about the prospects for wind energy in Thailand, but insists that it must be done correctly. A few years ago, during the fuel crisis in Thailand, wind energy suddenly became popular. Companies began importing and installing wind turbines that were largely not suitable for the low wind speeds of Thailand.

“When they bring windmills from abroad, they look like a monument, they don’t rotate. Until a storm comes, then they rotate. They are not designed for most of our region,” Dr Roy says.

In his view, a solution lies in low speed, decentralized wind turbines. These are turbines that can be put anywhere and are small, light structures, like ants feeding the grid. The first major project of Prapai is the King’s Wind Farm, a 200kw wind park made up of 20 individual 10kw wind turbines. The park is about 100m square and located in the village where the King of Thailand spends his summers.

The King himself supported the construction and the electricity is directed to the community and the grid. It has been deemed a success, although not without difficulties. Dr. Roy and his team have had to grapple with earthquakes and monsoon gusts. When I visited the site, workers were busy in the 42-degree heat repairing three turbines that were damaged from a recent monsoon.

The wind farm was developed on a previously dry, deserted field, and for Dr. Roy this is very important.