A giant hot-air blower designed to lay a warm blanket of air over crops during frosty weather is being trialled near Mt Pisa, north of Cromwell. The device, called a ''heat ranger'' burns LPG, rotates ...
Screw blowers use internal compression, lobed blowers use external compression. Screw blowers are more efficient, potentially cutting energy use in half. Resources: Atlas Copco, www.atlascopco.com ...
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