Japanese fan expert Masahiro Tsujimoto has described noisy cooling systems as a source of environmental pollution.
Speaking at an international fan conference, the managing director of Ziehl-Abegg in Japan, said cooling and fresh air machines must be silent and consume less energy.
Tsujimoto said Ziehl-Abegg has more than 100 years of experience in invention and the construction of electric motors and fans.
“The requirements have changed during the past 100 years,” he said.
“The focus was on ventilation system performance before it shifted to energy consumption which has been important for about 20 years. In recent years the focus has been on noise.”
Leading fan companies, he said, are working hard to eliminate noise as well as reducing energy consumption.
“The goal is to reduce the noise of air installation and air conditioning systems; we have worked hard to make this happen especially through our leadership in bionic fan design,” he said.
“We have used bionic design to reduce noise by more than 50 per cent.
“We have transferred characteristics from the owl, the eagle, the humpback whale and trees into fan design, always with the aim of reducing noise and optimising the fan's aerodynamics to reduce energy consumption.”